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lnk2019 with opencv treshold

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  • S superdu

    hello every one,

    I have a little problem with my qt project in qt creator. I try to use opencv but some function return to me error lnk 2019. its the case of imshow but as i dont really need it i dont care if that not work. But its also the case of other functions as threshold. Next to that im able to use Mat.

    When i make a new qt project directly in visual studio I do not encounter this problem. i can use all functions of opencv.

    I dont really know what is missing in my pro file:

    INCLUDEPATH += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/include
    
    LIBS += "C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_calib3d.lib"
    LIBS += "C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_core.lib"
    LIBS += "C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_dnn.lib"
    LIBS += "C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_features2d.lib"
    LIBS += "C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_flann.lib"
    LIBS += "C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_highgui.lib"
    LIBS += "C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_imgcodecs.lib"
    LIBS += "C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_imgproc.lib"
    LIBS += "C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_ml.lib"
    LIBS += "C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_objdetect.lib"
    LIBS += "C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_photo.lib"
    LIBS += "C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_stitching.lib"
    LIBS += "C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_video.lib"
    LIBS += "C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_videoio.lib"
    

    if someone already meet this kind of behavior i will be grateful to have the solution.

    thank you in advance

    jsulmJ Offline
    jsulmJ Offline
    jsulm
    Lifetime Qt Champion
    wrote on last edited by
    #2

    @superdu said in lnk2019 with opencv treshold:

    I try to use opencv but some function return to me error lnk 2019

    Please post the whole error

    https://forum.qt.io/topic/113070/qt-code-of-conduct

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    • S Offline
      S Offline
      superdu
      wrote on last edited by superdu
      #3

      yes sorry:

      image.obj:-1: erreur : LNK2019: external symbol unresolve "double __cdecl cv::threshold(class cv::debug_build_guard::_InputArray const &,class cv::debug_build_guard::_OutputArray const &,double,double,int)" (?threshold@cv@@YANAEBV_InputArray@debug_build_guard@1@AEBV_OutputArray@31@NNH@Z)reference in function "public: class QImage __cdecl Image::starsPosition(void)" (?starsPosition@Image@@QEAA?AVQImage@@XZ)

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      • SGaistS Offline
        SGaistS Offline
        SGaist
        Lifetime Qt Champion
        wrote on last edited by
        #4

        Hi,

        Might be a silly question but are you also using a 64 bit build of Qt ?

        Interested in AI ? www.idiap.ch
        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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        0
        • S Offline
          S Offline
          superdu
          wrote on last edited by
          #5

          yes yes i use 64bit qt version

          1 Reply Last reply
          0
          • SGaistS Offline
            SGaistS Offline
            SGaist
            Lifetime Qt Champion
            wrote on last edited by SGaist
            #6

            @superdu said in lnk2019 with opencv treshold:

            LIBS += "C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_calib3d.lib"

            Usually it's rather written as:

            LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/" -lopencv_calib3d
            

            Can you test that ?

            Interested in AI ? www.idiap.ch
            Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

            1 Reply Last reply
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            • S Offline
              S Offline
              superdu
              wrote on last edited by
              #7

              i originaly wrote it like that. That didn't work too.

              1 Reply Last reply
              0
              • SGaistS Offline
                SGaistS Offline
                SGaist
                Lifetime Qt Champion
                wrote on last edited by
                #8

                Is it the only symbol that fails the build ?

                Interested in AI ? www.idiap.ch
                Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                1 Reply Last reply
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                • S Offline
                  S Offline
                  superdu
                  wrote on last edited by
                  #9

                  if i use imshow, i have this problem too. but i can use Mat. By the way i use msvc2019 (32 and 64). at the beginning i thought it was the problem. So i tried to compile it with msvc2015 but still the same problem... and i can use this functions on visual studio... the only difference is the IDE so i think i miss something but what...

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                  • SGaistS Offline
                    SGaistS Offline
                    SGaist
                    Lifetime Qt Champion
                    wrote on last edited by
                    #10

                    Just to make sure we are on the same base, can you describe your setup exactly ?
                    Which IDE are you using ?
                    Which exact compiler are you using ?
                    Which compiler was used for OpenCV and for Qt ?

                    Interested in AI ? www.idiap.ch
                    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                    • S Offline
                      S Offline
                      superdu
                      wrote on last edited by
                      #11

                      for my project i use QtCreator but sometime, juste for test i use visual studio.
                      for openCV i used the package manager vcpkg but as that work on my vs i think its compile with msvc2019.
                      qt i just used the installer. i let here systems info from QtCreator:

                      {noformat}
                      Qt 5.15.2 (x86_64-little_endian-llp64 shared (dynamic) release build; by MSVC 2019) on "windows"
                      OS: Windows 10 Version 2009 [winnt version 10.0.19042]

                      Architecture: x86_64; features: SSE2 SSE3 SSSE3 SSE4.1 SSE4.2 AVX AVX2

                      Environment:
                      Qt5_DIR="D:\Qt\5.15.2\msvc2019_64"
                      QtMsBuild="C:\Users\antoi\AppData\Local\QtMsBuild"

                      Features: QT_NO_EXCEPTIONS

                      Library info:
                      PrefixPath: D:\Qt\Tools\QtCreator\bin
                      DocumentationPath: D:\Qt\Tools\QtCreator\bin\doc
                      HeadersPath: D:\Qt\Tools\QtCreator\bin\include
                      LibrariesPath: D:\Qt\Tools\QtCreator\bin
                      LibraryExecutablesPath: D:\Qt\Tools\QtCreator\bin\bin
                      BinariesPath: D:\Qt\Tools\QtCreator\bin
                      PluginsPath: D:\Qt\Tools\QtCreator\bin\plugins
                      ImportsPath: D:\Qt\Tools\QtCreator\bin\imports
                      Qml2ImportsPath: D:\Qt\Tools\QtCreator\bin\qml
                      ArchDataPath: D:\Qt\Tools\QtCreator\bin
                      DataPath: D:\Qt\Tools\QtCreator\bin
                      TranslationsPath: D:\Qt\Tools\QtCreator\bin\translations
                      ExamplesPath: D:\Qt\Tools\QtCreator\bin\examples
                      TestsPath: D:\Qt\Tools\QtCreator\bin\tests
                      SettingsPath:

                      Standard paths [... denote writable entry]:
                      DesktopLocation: "Desktop" C:\Users\antoi\OneDrive\Bureau
                      DocumentsLocation: "Documents" C:\Users\antoi\OneDrive\Documents
                      FontsLocation: "Fonts" C:\WINDOWS\Fonts
                      ApplicationsLocation: "Applications" C:\Users\antoi\AppData\Roaming\Microsoft\Windows\Start Menu\Programs
                      MusicLocation: "Music" C:\Users\antoi\Music
                      MoviesLocation: "Movies" C:\Users\antoi\Videos
                      PicturesLocation: "Pictures" C:\Users\antoi\OneDrive\Images
                      TempLocation: "Temporary Directory" C:\Users\antoi\AppData\Local\Temp
                      HomeLocation: "Home" C:\Users\antoi
                      AppLocalDataLocation: "Application Data" C:\Users\antoi\AppData\Local\QtProject\qtdiag C:\ProgramData\QtProject\qtdiag D:\Qt\Tools\QtCreator\bin D:\Qt\Tools\QtCreator\bin\data D:\Qt\Tools\QtCreator\bin\data\QtProject\qtdiag
                      CacheLocation: "Cache" C:\Users\antoi\AppData\Local\QtProject\qtdiag\cache
                      GenericDataLocation: "Shared Data" C:\Users\antoi\AppData\Local C:\ProgramData D:\Qt\Tools\QtCreator\bin D:\Qt\Tools\QtCreator\bin\data
                      RuntimeLocation: "Runtime" C:\Users\antoi
                      ConfigLocation: "Configuration" C:\Users\antoi\AppData\Local\QtProject\qtdiag C:\ProgramData\QtProject\qtdiag D:\Qt\Tools\QtCreator\bin D:\Qt\Tools\QtCreator\bin\data D:\Qt\Tools\QtCreator\bin\data\QtProject\qtdiag
                      DownloadLocation: "Download" C:\Users\antoi\Downloads
                      GenericCacheLocation: "Shared Cache" C:\Users\antoi\AppData\Local\cache
                      GenericConfigLocation: "Shared Configuration" C:\Users\antoi\AppData\Local C:\ProgramData D:\Qt\Tools\QtCreator\bin D:\Qt\Tools\QtCreator\bin\data
                      AppDataLocation: "Application Data" C:\Users\antoi\AppData\Roaming\QtProject\qtdiag C:\ProgramData\QtProject\qtdiag D:\Qt\Tools\QtCreator\bin D:\Qt\Tools\QtCreator\bin\data D:\Qt\Tools\QtCreator\bin\data\QtProject\qtdiag
                      AppConfigLocation: "Application Configuration" C:\Users\antoi\AppData\Local\QtProject\qtdiag C:\ProgramData\QtProject\qtdiag D:\Qt\Tools\QtCreator\bin D:\Qt\Tools\QtCreator\bin\data D:\Qt\Tools\QtCreator\bin\data\QtProject\qtdiag

                      File selectors (increasing order of precedence):
                      fr_FR windows winnt

                      Network:
                      Using "OpenSSL 1.1.1d 10 Sep 2019", version: 0x1010104f

                      Platform capabilities: ThreadedPixmaps OpenGL ThreadedOpenGL WindowMasks MultipleWindows ForeignWindows NonFullScreenWindows NativeWidgets WindowManagement RasterGLSurface AllGLFunctionsQueryable

                      Style hints:
                      mouseDoubleClickInterval: 500
                      mousePressAndHoldInterval: 800
                      startDragDistance: 10
                      startDragTime: 500
                      startDragVelocity: 0
                      keyboardInputInterval: 400
                      keyboardAutoRepeatRate: 32
                      cursorFlashTime: 1060
                      showIsFullScreen: 0
                      showIsMaximized: 0
                      passwordMaskDelay: 0
                      passwordMaskCharacter: U+25CF
                      fontSmoothingGamma: 1
                      useRtlExtensions: 0
                      setFocusOnTouchRelease: 0
                      tabFocusBehavior: Qt::TabFocusAllControls
                      singleClickActivation: 0

                      Additional style hints (QPlatformIntegration):
                      ReplayMousePressOutsidePopup: 1

                      Theme:
                      Platforms requested : windows
                      available : snap,flatpak,xdgdesktopportal
                      Styles requested : WindowsVista,Windows
                      available : windowsvista,Windows,Fusion
                      System font : "MS Shell Dlg 2" 8
                      Native file dialog

                      Fonts:
                      General font : "MS Shell Dlg 2" 8
                      Fixed font : "Courier New" 9
                      Title font : "MS Shell Dlg 2" 8
                      Smallest font: "MS Shell Dlg 2" 8

                      Palette:
                      QPalette::WindowText: #ff000000
                      QPalette::Button: #fff0f0f0
                      QPalette::Light: #ffffffff
                      QPalette::Midlight: #ffe3e3e3
                      QPalette::Dark: #ffa0a0a0
                      QPalette::Mid: #ffa0a0a0
                      QPalette::Text: #ff000000
                      QPalette::BrightText: #ffffffff
                      QPalette::ButtonText: #ff000000
                      QPalette::Base: #ffffffff
                      QPalette::Window: #fff0f0f0
                      QPalette::Shadow: #ff696969
                      QPalette::Highlight: #ff0078d7
                      QPalette::HighlightedText: #ffffffff
                      QPalette::Link: #ff0000ff
                      QPalette::LinkVisited: #ffff00ff
                      QPalette::AlternateBase: #ffe9e7e3
                      QPalette::NoRole: #ff000000
                      QPalette::ToolTipBase: #ffffffdc
                      QPalette::ToolTipText: #ff000000
                      QPalette::PlaceholderText: #80000000

                      Screens: 1, High DPI scaling: inactive

                      0 "\.\DISPLAY1" Depth: 32 Primary: yes

                      Manufacturer:
                      Model:
                      Serial number:
                      Geometry: 1920x1080+0+0 Available: 1920x1040+0+0
                      Physical size: 382x215 mm Refresh: 144 Hz Power state: 0
                      Physical DPI: 127.665,127.591 Logical DPI: 96,96 Subpixel_None
                      DevicePixelRatio: 1 Pixel density: 1
                      Primary orientation: 2 Orientation: 2 Native orientation: 0 OrientationUpdateMask: 0

                      Dynamic GL LibGL Vendor: NVIDIA Corporation
                      Renderer: NVIDIA GeForce RTX 2060/PCIe/SSE2
                      Version: 4.6.0 NVIDIA 466.63
                      Shading language: 4.60 NVIDIA
                      Format: Version: 4.6 Profile: 2 Swap behavior: 2 Buffer size (RGBA): 8,8,8,8 Depth buffer: 24 Stencil buffer: 8
                      Profile: None (QOpenGLFunctions_4_6)

                      Vulkan instance available
                      Supported instance extensions:
                      VK_KHR_device_group_creation, version 1
                      VK_KHR_display, version 23
                      VK_KHR_external_fence_capabilities, version 1
                      VK_KHR_external_memory_capabilities, version 1
                      VK_KHR_external_semaphore_capabilities, version 1
                      VK_KHR_get_display_properties2, version 1
                      VK_KHR_get_physical_device_properties2, version 2
                      VK_KHR_get_surface_capabilities2, version 1
                      VK_KHR_surface, version 25
                      VK_KHR_surface_protected_capabilities, version 1
                      VK_KHR_win32_surface, version 6
                      VK_EXT_debug_report, version 9
                      VK_EXT_debug_utils, version 2
                      VK_EXT_swapchain_colorspace, version 4
                      VK_NV_external_memory_capabilities, version 1
                      Supported layers:
                      VK_LAYER_NV_optimus, version 1, spec version 1.2.168, NVIDIA Optimus layer
                      VK_LAYER_VALVE_steam_overlay, version 1, spec version 1.2.136, Steam Overlay Layer
                      VK_LAYER_VALVE_steam_fossilize, version 1, spec version 1.2.136, Steam Pipeline Caching Layer
                      VK_LAYER_EOS_Overlay, version 1, spec version 1.2.136, Vulkan overlay layer for Epic Online Services
                      VK_LAYER_EOS_Overlay, version 1, spec version 1.2.136, Vulkan overlay layer for Epic Online Services
                      Available physical devices:
                      API version 1.2.168, vendor 0x10DE, device 0x1F11, NVIDIA GeForce RTX 2060, type 2, driver version 466.252.0

                      GPU #1:
                      Card name : NVIDIA GeForce RTX 2060
                      Driver Name : nvldumdx.dll
                      Driver Version : 27.21.14.6663
                      Vendor ID : 0x10DE
                      Device ID : 0x1F11
                      SubSys ID : 0x3FFD17AA
                      Revision ID : 0x00A1

                      Qt Rendering Hardware Interface supported backends:
                      OpenGL (with default QSurfaceFormat):
                      Min Texture Size: 1
                      Max Texture Size: 32768
                      Max Color Attachments: 8
                      Frames in Flight: 1
                      Uniform Buffer Alignment: 1
                      Supported MSAA sample counts: 1,2,4,8,16,32
                      Features:
                      - MultisampleTexture
                      v MultisampleRenderBuffer
                      - DebugMarkers
                      - Timestamps
                      v Instancing
                      - CustomInstanceStepRate
                      v PrimitiveRestart
                      v NonDynamicUniformBuffers
                      v NonFourAlignedEffectiveIndexBufferOffset
                      v NPOTTextureRepeat
                      - RedOrAlpha8IsRed
                      v ElementIndexUint
                      v Compute
                      v WideLines
                      v VertexShaderPointSize
                      v BaseVertex
                      - BaseInstance
                      v TriangleFanTopology
                      v ReadBackNonUniformBuffer
                      v ReadBackNonBaseMipLevel
                      Texture formats: RGBA8 BGRA8 R8 R16 RED_OR_ALPHA8 RGBA16F RGBA32F R16F R32F D16 D32F BC1 BC2 BC3 ETC2_RGB8 ETC2_RGB8A1 ETC2_RGBA8 ASTC_4x4 ASTC_5x4 ASTC_5x5 ASTC_6x5 ASTC_6x6 ASTC_8x5 ASTC_8x6 ASTC_8x8 ASTC_10x5 ASTC_10x6 ASTC_10x8 ASTC_10x10 ASTC_12x10 ASTC_12x12
                      Vulkan:
                      Min Texture Size: 1
                      Max Texture Size: 32768
                      Max Color Attachments: 8
                      Frames in Flight: 2
                      Uniform Buffer Alignment: 64
                      Supported MSAA sample counts: 1,2,4,8
                      Features:
                      v MultisampleTexture
                      v MultisampleRenderBuffer
                      - DebugMarkers
                      v Timestamps
                      v Instancing
                      - CustomInstanceStepRate
                      v PrimitiveRestart
                      v NonDynamicUniformBuffers
                      v NonFourAlignedEffectiveIndexBufferOffset
                      v NPOTTextureRepeat
                      v RedOrAlpha8IsRed
                      v ElementIndexUint
                      v Compute
                      v WideLines
                      v VertexShaderPointSize
                      v BaseVertex
                      v BaseInstance
                      v TriangleFanTopology
                      v ReadBackNonUniformBuffer
                      v ReadBackNonBaseMipLevel
                      Texture formats: RGBA8 BGRA8 R8 R16 RED_OR_ALPHA8 RGBA16F RGBA32F R16F R32F D16 D32F BC1 BC2 BC3 BC4 BC5 BC6H BC7
                      Direct3D 11:
                      Min Texture Size: 1
                      Max Texture Size: 16384
                      Max Color Attachments: 8
                      Frames in Flight: 1
                      Uniform Buffer Alignment: 256
                      Supported MSAA sample counts: 1,2,4,8
                      Features:
                      v MultisampleTexture
                      v MultisampleRenderBuffer
                      v DebugMarkers
                      v Timestamps
                      v Instancing
                      v CustomInstanceStepRate
                      v PrimitiveRestart
                      - NonDynamicUniformBuffers
                      v NonFourAlignedEffectiveIndexBufferOffset
                      v NPOTTextureRepeat
                      v RedOrAlpha8IsRed
                      v ElementIndexUint
                      v Compute
                      - WideLines
                      - VertexShaderPointSize
                      v BaseVertex
                      v BaseInstance
                      - TriangleFanTopology
                      v ReadBackNonUniformBuffer
                      v ReadBackNonBaseMipLevel
                      Texture formats: RGBA8 BGRA8 R8 R16 RED_OR_ALPHA8 RGBA16F RGBA32F R16F R32F D16 D32F BC1 BC2 BC3 BC4 BC5 BC6H BC7

                      Plugin information:

                      • Android 4.15.0
                      • AutoTest 4.15.0
                        AutotoolsProjectManager 4.15.0
                        BareMetal 4.15.0
                      • Bazaar 4.15.0
                        Beautifier 4.15.0
                      • BinEditor 4.15.0
                      • Bookmarks 4.15.0
                        Boot2Qt 4.15.0
                      • CMakeProjectManager 4.15.0
                      • CVS 4.15.0
                      • ClangCodeModel 4.15.0
                        ClangFormat 4.15.0
                      • ClangTools 4.15.0
                      • ClassView 4.15.0
                        ClearCase 4.15.0
                      • CodePaster 4.15.0
                        CompilationDatabaseProjectManager 4.15.0
                        Conan 4.15.0
                      • Core 4.15.0
                      • CppEditor 4.15.0
                      • CppTools 4.15.0
                        Cppcheck 4.15.0
                      • CtfVisualizer 4.15.0
                      • Debugger 4.15.0
                      • Designer 4.15.0
                      • DiffEditor 4.15.0
                        EmacsKeys 4.15.0
                      • FakeVim 4.15.0
                      • GLSLEditor 4.15.0
                      • GenericProjectManager 4.15.0
                      • Git 4.15.0
                        HelloWorld 4.15.0
                      • Help 4.15.0
                      • ImageViewer 4.15.0
                      • IncrediBuild 4.15.0
                        Ios 4.15.0
                      • LanguageClient 4.15.0
                      • Macros 4.15.0
                      • Marketplace 4.15.0
                        McuSupport 4.15.0
                      • Mercurial 4.15.0
                        MesonProjectManager 4.15.0
                      • ModelEditor 4.15.0
                        Nim 4.15.0
                      • PerfProfiler 4.15.0
                        Perforce 4.15.0
                      • ProjectExplorer 4.15.0
                      • Python 4.15.0
                      • QbsProjectManager 4.15.0
                      • QmakeProjectManager 4.15.0
                      • QmlDesigner 4.15.0
                      • QmlJSEditor 4.15.0
                      • QmlJSTools 4.15.0
                      • QmlPreview 4.15.0
                      • QmlProfiler 4.15.0
                      • QmlProjectManager 4.15.0
                      • Qnx 4.15.0
                      • QtSupport 4.15.0
                      • RemoteLinux 4.15.0
                      • ResourceEditor 4.15.0
                      • ScxmlEditor 4.15.0
                        SerialTerminal 4.15.0
                        SilverSearcher 4.15.0
                        StudioWelcome 4.15.0
                      • Subversion 4.15.0
                      • TaskList 4.15.0
                      • TextEditor 4.15.0
                        Todo 4.15.0
                      • UpdateInfo 4.15.0
                      • Valgrind 4.15.0
                      • VcsBase 4.15.0
                      • WebAssembly 4.15.0
                      • Welcome 4.15.0
                      • WinRt 4.15.0

                      Qt Creator 4.15.0
                      Basé sur Qt 5.15.2 (MSVC 2019, 64 bit)
                      From revision 978f6caf1e
                      Built on May 4 2021 01:16:56

                      {noformat}

                      1 Reply Last reply
                      0
                      • SGaistS Offline
                        SGaistS Offline
                        SGaist
                        Lifetime Qt Champion
                        wrote on last edited by
                        #12

                        Ok... nothing stands out as wrong.

                        Can you start from a default Qt project and just one OpenCV method there ?

                        It might be easier to debug your issue.

                        Interested in AI ? www.idiap.ch
                        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                        1 Reply Last reply
                        0
                        • S Offline
                          S Offline
                          superdu
                          wrote on last edited by superdu
                          #13

                          ok so here the code (thank you for your time by the way):

                          cpp

                          #include "mainwindow.h"
                          #include "ui_mainwindow.h"
                          
                          MainWindow::MainWindow(QWidget *parent)
                              : QMainWindow(parent)
                              , ui(new Ui::MainWindow)
                          {
                              ui->setupUi(this);
                              Mat new_img = Mat::zeros(25, 25, CV_16U);
                              Mat dest;
                          
                              threshold(new_img,dest,200,255,THRESH_BINARY | THRESH_OTSU);
                          
                          }
                          
                          MainWindow::~MainWindow()
                          {
                              delete ui;
                          }
                          
                          
                          

                          header

                          #ifndef MAINWINDOW_H
                          #define MAINWINDOW_H
                          
                          #include <QMainWindow>
                          #include <opencv2/core.hpp>
                          #include <opencv2/highgui.hpp>
                          #include <opencv2/imgcodecs.hpp>
                          #include <opencv2/opencv.hpp>
                          #include "opencv2/imgproc.hpp"
                          
                          using namespace cv;
                          
                          QT_BEGIN_NAMESPACE
                          namespace Ui { class MainWindow; }
                          QT_END_NAMESPACE
                          
                          class MainWindow : public QMainWindow
                          {
                              Q_OBJECT
                          
                          public:
                              MainWindow(QWidget *parent = nullptr);
                              ~MainWindow();
                          
                          private:
                              Ui::MainWindow *ui;
                          };
                          #endif // MAINWINDOW_H
                          
                          

                          pro

                          QT       += core gui
                          
                          greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
                          
                          CONFIG += c++11
                          
                          # You can make your code fail to compile if it uses deprecated APIs.
                          # In order to do so, uncomment the following line.
                          #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
                          
                          SOURCES += \
                              main.cpp \
                              mainwindow.cpp
                          
                          HEADERS += \
                              mainwindow.h
                          
                          FORMS += \
                              mainwindow.ui
                          
                          INCLUDEPATH += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/include
                          
                          LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_calib3d.lib
                          LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_core.lib
                          LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_dnn.lib
                          LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_features2d.lib
                          LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_flann.lib
                          LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_highgui.lib
                          LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_imgcodecs.lib
                          LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_imgproc.lib
                          LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_ml.lib
                          LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_objdetect.lib
                          LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_photo.lib
                          LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_stitching.lib
                          LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_video.lib
                          LIBS += C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib/opencv_videoio.lib
                          
                          
                          TRANSLATIONS += \
                              test_fr_FR.ts
                          CONFIG += lrelease
                          CONFIG += embed_translations
                          
                          # Default rules for deployment.
                          qnx: target.path = /tmp/$${TARGET}/bin
                          else: unix:!android: target.path = /opt/$${TARGET}/bin
                          !isEmpty(target.path): INSTALLS += target
                          
                          

                          the code reproduce the problem for me:

                          mainwindow.obj:-1: erreur : LNK2019: symbole externe non r‚solu "double __cdecl cv::threshold(class cv::debug_build_guard::_InputArray const &,class cv::debug_build_guard::_OutputArray const &,double,double,int)" (?threshold@cv@@YANAEBV_InputArray@debug_build_guard@1@AEBV_OutputArray@31@NNH@Z) r‚f‚renc‚ dans la fonction "public: __cdecl MainWindow::MainWindow(class QWidget *)" (??0MainWindow@@QEAA@PEAVQWidget@@@Z)

                          1 Reply Last reply
                          0
                          • SGaistS Offline
                            SGaistS Offline
                            SGaist
                            Lifetime Qt Champion
                            wrote on last edited by
                            #14

                            Does the build output show that the libraries are currently linked ?

                            By the way, you should move all your includes to the .cpp file. There's nothing in the header that uses OpenCV.

                            Interested in AI ? www.idiap.ch
                            Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                            1 Reply Last reply
                            1
                            • S Offline
                              S Offline
                              superdu
                              wrote on last edited by
                              #15

                              here the compile output:

                              21:18:53: Running steps for project test...
                              21:18:53: Configuration unchanged, skipping qmake step.
                              21:18:53: Starting: "D:\Qt\Tools\QtCreator\bin\jom.exe"
                              D:\Qt\Tools\QtCreator\bin\jom.exe -f Makefile.Debug
                              link /NOLOGO /DYNAMICBASE /NXCOMPAT /DEBUG /SUBSYSTEM:WINDOWS "/MANIFESTDEPENDENCY:type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' publicKeyToken='6595b64144ccf1df' language='' processorArchitecture=''" /MANIFEST:embed /OUT:debug\test.exe @C:\Users\antoi\AppData\Local\Temp\test.exe.16732.0.jom
                              mainwindow.obj : error LNK2019: unresolved external symbol "double __cdecl cv::threshold(class cv::debug_build_guard::_InputArray const &,class cv::debug_build_guard::_OutputArray const &,double,double,int)" (?threshold@cv@@YANAEBV_InputArray@debug_build_guard@1@AEBV_OutputArray@31@NNH@Z) referenced in function "public: __cdecl MainWindow::MainWindow(class QWidget *)" (??0MainWindow@@QEAA@PEAVQWidget@@@Z)
                              debug\test.exe : fatal error LNK1120: 1 unresolved externals
                              jom: C:\Users\antoi\OneDrive\Documents\QTtest\build-test-Desktop_Qt_5_15_2_MSVC2019_64bit-Debug\Makefile.Debug [debug\test.exe] Error 1120
                              jom: C:\Users\antoi\OneDrive\Documents\QTtest\build-test-Desktop_Qt_5_15_2_MSVC2019_64bit-Debug\Makefile [debug] Error 2
                              21:18:53: The process "D:\Qt\Tools\QtCreator\bin\jom.exe" exited with code 2.
                              Error while building/deploying project test (kit: Desktop Qt 5.15.2 MSVC2019 64bit)
                              When executing step "Make"
                              21:18:53: Elapsed time: 00:00.

                              1 Reply Last reply
                              0
                              • SGaistS Offline
                                SGaistS Offline
                                SGaist
                                Lifetime Qt Champion
                                wrote on last edited by
                                #16

                                Ok... does the Makefile contain any references to OpenCV ?

                                Interested in AI ? www.idiap.ch
                                Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                                1 Reply Last reply
                                0
                                • S Offline
                                  S Offline
                                  superdu
                                  wrote on last edited by
                                  #17

                                  no indeed... they are no reference to opencv:

                                  #############################################################################

                                  Makefile for building: test

                                  Generated by qmake (3.1) (Qt 5.15.2)

                                  Project: ..\test\test.pro

                                  Template: app

                                  Command: D:\Qt\5.15.2\msvc2019_64\bin\qmake.exe -o Makefile ..\test\test.pro -spec win32-msvc "CONFIG+=debug" "CONFIG+=qml_debug"

                                  #############################################################################

                                  MAKEFILE = Makefile

                                  EQ = =

                                  first: debug
                                  install: debug-install
                                  uninstall: debug-uninstall
                                  QMAKE = D:\Qt\5.15.2\msvc2019_64\bin\qmake.exe
                                  DEL_FILE = del
                                  CHK_DIR_EXISTS= if not exist
                                  MKDIR = mkdir
                                  COPY = copy /y
                                  COPY_FILE = copy /y
                                  COPY_DIR = xcopy /s /q /y /i
                                  INSTALL_FILE = copy /y
                                  INSTALL_PROGRAM = copy /y
                                  INSTALL_DIR = xcopy /s /q /y /i
                                  QINSTALL = D:\Qt\5.15.2\msvc2019_64\bin\qmake.exe -install qinstall
                                  QINSTALL_PROGRAM = D:\Qt\5.15.2\msvc2019_64\bin\qmake.exe -install qinstall -exe
                                  DEL_FILE = del
                                  SYMLINK = $(QMAKE) -install ln -f -s
                                  DEL_DIR = rmdir
                                  MOVE = move
                                  IDC = idc
                                  IDL = midl
                                  ZIP = zip -r -9
                                  DEF_FILE =
                                  RES_FILE =
                                  SED = $(QMAKE) -install sed
                                  MOVE = move
                                  SUBTARGETS =
                                  debug
                                  release

                                  debug: $(MAKEFILE) FORCE
                                  @set MAKEFLAGS=$(MAKEFLAGS)
                                  $(MAKE) -f $(MAKEFILE).Debug
                                  debug-make_first: FORCE
                                  @set MAKEFLAGS=$(MAKEFLAGS)
                                  $(MAKE) -f $(MAKEFILE).Debug
                                  debug-all: FORCE
                                  @set MAKEFLAGS=$(MAKEFLAGS)
                                  $(MAKE) -f $(MAKEFILE).Debug all
                                  debug-clean: FORCE
                                  @set MAKEFLAGS=$(MAKEFLAGS)
                                  $(MAKE) -f $(MAKEFILE).Debug clean
                                  debug-distclean: FORCE
                                  @set MAKEFLAGS=$(MAKEFLAGS)
                                  $(MAKE) -f $(MAKEFILE).Debug distclean
                                  debug-install: FORCE
                                  @set MAKEFLAGS=$(MAKEFLAGS)
                                  $(MAKE) -f $(MAKEFILE).Debug install
                                  debug-uninstall: FORCE
                                  @set MAKEFLAGS=$(MAKEFLAGS)
                                  $(MAKE) -f $(MAKEFILE).Debug uninstall
                                  release: $(MAKEFILE) FORCE
                                  @set MAKEFLAGS=$(MAKEFLAGS)
                                  $(MAKE) -f $(MAKEFILE).Release
                                  release-make_first: FORCE
                                  @set MAKEFLAGS=$(MAKEFLAGS)
                                  $(MAKE) -f $(MAKEFILE).Release
                                  release-all: FORCE
                                  @set MAKEFLAGS=$(MAKEFLAGS)
                                  $(MAKE) -f $(MAKEFILE).Release all
                                  release-clean: FORCE
                                  @set MAKEFLAGS=$(MAKEFLAGS)
                                  $(MAKE) -f $(MAKEFILE).Release clean
                                  release-distclean: FORCE
                                  @set MAKEFLAGS=$(MAKEFLAGS)
                                  $(MAKE) -f $(MAKEFILE).Release distclean
                                  release-install: FORCE
                                  @set MAKEFLAGS=$(MAKEFLAGS)
                                  $(MAKE) -f $(MAKEFILE).Release install
                                  release-uninstall: FORCE
                                  @set MAKEFLAGS=$(MAKEFLAGS)
                                  $(MAKE) -f $(MAKEFILE).Release uninstall

                                  Makefile: ..\test\test.pro D:\Qt\5.15.2\msvc2019_64\mkspecs\win32-msvc\qmake.conf D:\Qt\5.15.2\msvc2019_64\mkspecs\features\spec_pre.prf
                                  ...
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                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_3dextras_private.pri
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_3dinput.pri
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                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_webchannel.pri:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_webchannel_private.pri:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_webengine.pri:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_webengine_private.pri:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_webenginecore.pri:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_webenginecore_private.pri:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_webenginecoreheaders_private.pri:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_webenginewidgets.pri:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_webenginewidgets_private.pri:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_websockets.pri:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_websockets_private.pri:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_webview.pri:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_webview_private.pri:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_widgets.pri:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_widgets_private.pri:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_windowsuiautomation_support_private.pri:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_winextras.pri:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_winextras_private.pri:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_xml.pri:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_xml_private.pri:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_xmlpatterns.pri:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_xmlpatterns_private.pri:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_zlib_private.pri:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\features\qt_functions.prf:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\features\qt_config.prf:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\win32-msvc\qmake.conf:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\features\spec_post.prf:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\features\exclusive_builds.prf:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\common\msvc-version.conf:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\features\toolchain.prf:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\features\default_pre.prf:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\features\win32\default_pre.prf:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\features\resolve_config.prf:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\features\exclusive_builds_post.prf:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\features\default_post.prf:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\features\lrelease.prf:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\features\qml_debug.prf:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\features\precompile_header.prf:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\features\warn_on.prf:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\features\qt.prf:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\features\resources_functions.prf:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\features\resources.prf:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\features\moc.prf:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\features\win32\opengl.prf:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\features\uic.prf:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\features\qmake_use.prf:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\features\file_copies.prf:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\features\win32\windows.prf:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\features\testcase_targets.prf:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\features\exceptions.prf:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\features\yacc.prf:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\features\lex.prf:
                                  ..\test\test.pro:
                                  D:\Qt\5.15.2\msvc2019_64\lib\Qt5Widgets.prl:
                                  D:\Qt\5.15.2\msvc2019_64\lib\Qt5Gui.prl:
                                  D:\Qt\5.15.2\msvc2019_64\lib\Qt5Core.prl:
                                  D:\Qt\5.15.2\msvc2019_64\lib\qtmain.prl:
                                  .qmake.stash:
                                  D:\Qt\5.15.2\msvc2019_64\mkspecs\features\build_pass.prf:
                                  debug\qmake_qmake_qm_files.qrc:
                                  D:\Qt\5.15.2\msvc2019_64\lib\Qt5Widgetsd.prl:
                                  D:\Qt\5.15.2\msvc2019_64\lib\Qt5Guid.prl:
                                  D:\Qt\5.15.2\msvc2019_64\lib\Qt5Cored.prl:
                                  D:\Qt\5.15.2\msvc2019_64\lib\qtmaind.prl:
                                  release\qmake_qmake_qm_files.qrc:
                                  qmake: FORCE
                                  @$(QMAKE) -o Makefile ..\test\test.pro -spec win32-msvc "CONFIG+=debug" "CONFIG+=qml_debug"

                                  qmake_all: FORCE

                                  make_first: debug-make_first release-make_first FORCE
                                  all: debug-all release-all FORCE
                                  clean: debug-clean release-clean FORCE
                                  -$(DEL_FILE) test.vc.pdb
                                  -$(DEL_FILE) test.ilk
                                  -$(DEL_FILE) test.idb
                                  distclean: debug-distclean release-distclean FORCE
                                  -$(DEL_FILE) Makefile
                                  -$(DEL_FILE) .qmake.stash test.pdb

                                  debug-mocclean:
                                  @set MAKEFLAGS=$(MAKEFLAGS)
                                  $(MAKE) -f $(MAKEFILE).Debug mocclean
                                  release-mocclean:
                                  @set MAKEFLAGS=$(MAKEFLAGS)
                                  $(MAKE) -f $(MAKEFILE).Release mocclean
                                  mocclean: debug-mocclean release-mocclean

                                  debug-mocables:
                                  @set MAKEFLAGS=$(MAKEFLAGS)
                                  $(MAKE) -f $(MAKEFILE).Debug mocables
                                  release-mocables:
                                  @set MAKEFLAGS=$(MAKEFLAGS)
                                  $(MAKE) -f $(MAKEFILE).Release mocables
                                  mocables: debug-mocables release-mocables

                                  check: first

                                  benchmark: first
                                  FORCE:

                                  $(MAKEFILE).Debug: Makefile
                                  $(MAKEFILE).Release: Makefile

                                  1 Reply Last reply
                                  0
                                  • SGaistS Offline
                                    SGaistS Offline
                                    SGaist
                                    Lifetime Qt Champion
                                    wrote on last edited by
                                    #18

                                    You are missing the "-l" in your LIBS lines.

                                    Interested in AI ? www.idiap.ch
                                    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                                    • S Offline
                                      S Offline
                                      superdu
                                      wrote on last edited by
                                      #19

                                      hum, but they are presents in makefile.debug

                                      i also try again this notation but still the same problem

                                      LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_calib3d
                                      LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_core
                                      LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_dnn
                                      LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_features2d
                                      LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_flann
                                      LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_highgui
                                      LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_imgcodecs
                                      LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_imgproc
                                      LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_ml
                                      LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_objdetect
                                      LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_photo
                                      LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_stitching
                                      LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_video
                                      LIBS += -L"C:/src/vcpkg/vcpkg/packages/opencv4_x64-windows/lib" -lopencv_videoio
                                      
                                      
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                                      0
                                      • SGaistS Offline
                                        SGaistS Offline
                                        SGaist
                                        Lifetime Qt Champion
                                        wrote on last edited by
                                        #20

                                        So if you build in debug mode it works ?

                                        Interested in AI ? www.idiap.ch
                                        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                                        0
                                        • S Offline
                                          S Offline
                                          superdu
                                          wrote on last edited by
                                          #21

                                          no... i dont know why but i feel if we find the problem that will be something really stupid. and if not i will just try to compile by hand opencv but that should work like that

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