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Configure matlab engine in qtcreator

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  • SGaistS Offline
    SGaistS Offline
    SGaist
    Lifetime Qt Champion
    wrote on last edited by
    #5

    Hi,

    Aren't you mixing 32 and 64 bit MinGW ?

    By the you should rather use forward slashes everywhere. Qt handles the conversion for you. Otherwise use double backslashes.

    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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    • Z Offline
      Z Offline
      Zhitoune
      wrote on last edited by Zhitoune
      #6

      Thanks for you help!
      that's what I'm trying to determine. I'll post when I know more

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      • Z Offline
        Z Offline
        Zhitoune
        wrote on last edited by
        #7

        So I checked and it seem that the matlab libraries were compiled using minGW-w64 while I'm using minGW 5.3 32 bit. Can the errors I obtain be the results of this imcompatibility?
        So I configured a new kit with MSVC2015 64bit compiler but I get the following error :

        mainwindow.obj:-1: error: LNK2019: unresolved external symbol engOpen referenced in function "public: __cdecl MainWindow::MainWindow(class QWidget *)" (??0MainWindow@@QEAA@PEAVQWidget@@@Z)
        
        mrjjM 1 Reply Last reply
        0
        • Z Zhitoune

          So I checked and it seem that the matlab libraries were compiled using minGW-w64 while I'm using minGW 5.3 32 bit. Can the errors I obtain be the results of this imcompatibility?
          So I configured a new kit with MSVC2015 64bit compiler but I get the following error :

          mainwindow.obj:-1: error: LNK2019: unresolved external symbol engOpen referenced in function "public: __cdecl MainWindow::MainWindow(class QWidget *)" (??0MainWindow@@QEAA@PEAVQWidget@@@Z)
          
          mrjjM Offline
          mrjjM Offline
          mrjj
          Lifetime Qt Champion
          wrote on last edited by
          #8

          @Zhitoune
          Make sure to completely wipe the build folder and
          run qmake and rebuild all.

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          1
          • Z Offline
            Z Offline
            Zhitoune
            wrote on last edited by
            #9

            thanks for your help,

            I always use rebuild. should I clean and rebuild?

            mrjjM 1 Reply Last reply
            0
            • Z Zhitoune

              thanks for your help,

              I always use rebuild. should I clean and rebuild?

              mrjjM Offline
              mrjjM Offline
              mrjj
              Lifetime Qt Champion
              wrote on last edited by mrjj
              #10

              @Zhitoune
              well to be 100% sure, please delete the build folder. ( in this case)
              This is normally not needed but if anything remains from the minGw compile and u now are using visual studio then odd errors will pop up.
              ( the .o files should in other folder, but better sure than sorry)

              Often rebuild is enough but sometimes full deletion is needed.
              Update:
              Sorry, i misread.
              it complains about engOpen
              which i assume is from the MATLAB lib

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              • Z Offline
                Z Offline
                Zhitoune
                wrote on last edited by
                #11

                yes it is!

                mrjjM 1 Reply Last reply
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                • Z Zhitoune

                  yes it is!

                  mrjjM Offline
                  mrjjM Offline
                  mrjj
                  Lifetime Qt Champion
                  wrote on last edited by mrjj
                  #12

                  @Zhitoune
                  And the MATLAB r2017b libraries are compiled with 2015/2017 64 bit ?

                  Higher up you show
                  C:\MATLAB\R2017b\extern\lib\win64\mingw64\libeng.lib"

                  but maybe it also contains libs for visual studio in other folder than mingw64 ?

                  Ah yes, seems to be in
                  c:\matlab\r2017a\extern\lib\win64\microsoft

                  So those are 2015/2015 compiled?

                  You cannot fix DLLS from other compilers. It must be same compiler for App and
                  matlab libs.

                  So mingw32 wont load 64 bit mingw.

                  but so we are clear.

                  You are now using
                  MSVC2015 compiler (installed by your self)
                  Qt 2015 version kit
                  and points to
                  win32:LIBS += -L"c:\matlab\r2017a\extern\lib\win64\microsoft" -leng
                  -L"c:\MATLAB\R2017a\extern\lib\win64\microsoft" -lmx

                  from .pro file?

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                  • Z Offline
                    Z Offline
                    Zhitoune
                    wrote on last edited by
                    #13

                    So it's finaly working with a kit made of :
                    Desktop Qt 5.9.2
                    MSVC2015 64bit

                    and my .pro file looks like this :

                    QT += core gui
                    
                    greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
                    
                    TARGET = testMatlabEngine
                    TEMPLATE = app
                    
                    DEFINES += QT_DEPRECATED_WARNINGS
                    
                    CONFIG += create_prl
                    CONFIG += link_prl
                    
                    SOURCES += main.cpp \
                               mainwindow.cpp
                    
                    HEADERS  += mainwindow.h \
                                engine.h
                                matrix.h
                    
                    DISTFILES += \
                        codeMatlab.m
                    
                    LIBS += -L"C:/MATLAB/R2017b/extern/lib/win64/microsoft/" -llibeng \
                            -L"C:/MATLAB/R2017b/extern/lib/win64/microsoft/" -llibmx
                    
                    INCLUDEPATH += C:/MATLAB/R2017b/extern/include
                    
                    

                    Thank you very for your help!!!!

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                    • Z Offline
                      Z Offline
                      Zhitoune
                      wrote on last edited by
                      #14

                      I also unchecked the "shadow build" in the built settings. it started getting better after that.

                      1 Reply Last reply
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