lnk2019 with opencv treshold

[SGaist]

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.

[superdu]

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.

[SGaist]

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

[superdu]

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_3dinput.pri
D:\Qt\5.15.2\msvc2019_64\mkspecs\modules\qt_lib_3dinput_private.pri
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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

[SGaist]

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

[superdu]

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

[SGaist]

So if you build in debug mode it works ?

[superdu]

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

[SGaist]

Are these static or dynamic librairies ?

In any case, what I would do is simplify things with the LIBS part to only link to opencv_core and only use symbols from that library in the sample application.

This will restrict the scope of the issue.

[superdu]

i just checked it with lib.exe and libs file containes dll. its dynamics library

[superdu]

ok so i compile by hand opencv following this step: https://wiki.qt.io/How_to_setup_Qt_and_openCV_on_Windows_with_MSVC2017#Building_OpenCV

the two difference is i use msvc 2019 and opencv 4.5.1.

compilation seems to be a succes but when i try to us it in qt the application crash without any information

[SGaist]

If there's a crash then it likely is that the dlls are not found at run time. Go to the Run part of the Project panel and update the PATH environment variable there so that the folder containing the OpenCV dlls are found.

[superdu]

Ok my bad. i already added to path but i didnt restart my computer. i just restart it and that work well.

result: no more problem and treshold function work. thank you so much for your time!

[SGaist]

Then you did it in the wrong place. Do not alter your machine's PATH, do it in Qt Creator as I explained above.