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Forum Update on Monday, May 27th 2025

Qt and QGis integration ERROR `__imp__ZN14QgsApplicationC1ERiPPcbRK7QStringS5_'

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  • A Offline
    A Offline
    Aman55
    wrote on last edited by Aman55
    #3

    Can you guide to compile OSGeo with MinGW? @Christian-Ehrlicher . As in OSGeo installer i don't get option to choose MinGw or MSVC.

    jsulmJ 1 Reply Last reply
    0
    • A Aman55

      Can you guide to compile OSGeo with MinGW? @Christian-Ehrlicher . As in OSGeo installer i don't get option to choose MinGw or MSVC.

      jsulmJ Offline
      jsulmJ Offline
      jsulm
      Lifetime Qt Champion
      wrote on last edited by
      #4

      @Aman55 said in Qt and QGis integration ERROR `__imp__ZN14QgsApplicationC1ERiPPcbRK7QStringS5_':

      Can you guide to compile OSGeo with MinGW?

      Please refer to their documentation: https://github.com/qgis/QGIS/blob/master/INSTALL.md

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

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      • A Offline
        A Offline
        Aman55
        wrote on last edited by Aman55
        #5

        I have downloaded visual studio 2017 and I updated my compiler with Qt Compiler MSVC 2017. got an error
        C:\OSGeo4W\apps\qgis-ltr-dev\include\qgssettingsentry.h:31: error: C7525: inline variables require at least '/std:c++17' @Christian-Ehrlicher @jsulm

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        • A Offline
          A Offline
          Aman55
          wrote on last edited by
          #6

          update c++11 to c++17 and build successfully . but 13:39:44: The program has unexpectedly finished. when i run in debug mode it giving ![alt Screenshot (6).png

          jsulmJ 1 Reply Last reply
          0
          • A Aman55

            update c++11 to c++17 and build successfully . but 13:39:44: The program has unexpectedly finished. when i run in debug mode it giving ![alt Screenshot (6).png

            jsulmJ Offline
            jsulmJ Offline
            jsulm
            Lifetime Qt Champion
            wrote on last edited by
            #7

            @Aman55 Do you have the debug versions of the QGIS libs?

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

            A 1 Reply Last reply
            0
            • jsulmJ jsulm

              @Aman55 Do you have the debug versions of the QGIS libs?

              A Offline
              A Offline
              Aman55
              wrote on last edited by
              #8

              @jsulm can't say yes. if it comes with download only.

              jsulmJ 1 Reply Last reply
              0
              • A Aman55

                @jsulm can't say yes. if it comes with download only.

                jsulmJ Offline
                jsulmJ Offline
                jsulm
                Lifetime Qt Champion
                wrote on last edited by
                #9

                @Aman55 said in Qt and QGis integration ERROR `__imp__ZN14QgsApplicationC1ERiPPcbRK7QStringS5_':

                can't say yes. if it comes with download only.

                You can simply check what DLLs where installed.
                Does release build work?

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

                A 1 Reply Last reply
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                • jsulmJ jsulm

                  @Aman55 said in Qt and QGis integration ERROR `__imp__ZN14QgsApplicationC1ERiPPcbRK7QStringS5_':

                  can't say yes. if it comes with download only.

                  You can simply check what DLLs where installed.
                  Does release build work?

                  A Offline
                  A Offline
                  Aman55
                  wrote on last edited by
                  #10

                  @jsulm Yes release build work for the above main.cpp code. currently used to load shp file and gives error
                  C:\OSGeo4W\apps\qgis-ltr-dev\include\qgsabstractgeometry.h:596: error: C2065: 'M_PI': undeclared identifier
                  C:\OSGeo4W\apps\qgis-ltr-dev\include\qgsvector.h:175: error: C2065: 'M_PI': undeclared identifier
                  C:\OSGeo4W\apps\qgis-ltr-dev\include\qgsgeometry.h:2757: error: C2065: 'M_PI': undeclared identifier

                  // main.cpp
                  int main(int argc, char *argv[]) {
                      QApplication a(argc, argv);
                      // 1. Initialize QGIS
                      QgsApplication::setPrefixPath("C:/OSGeo4W64/apps/qgis-ltr-dev", true); // Replace with your QGIS installation path
                      QgsApplication::init();
                  
                      // 2. Specify the path to your SHP file
                      QString shpFilePath = ":/gis_osm_barriers_07_1.shp"; // Replace with the actual path
                  
                      // 3. Check if the file exists
                      QFileInfo fileInfo(shpFilePath);
                      if (!fileInfo.exists()) {
                          qDebug() << "Error: Shapefile not found at" << shpFilePath;
                          QgsApplication::exit();
                          return 1;
                      }
                  
                  
                      // 4. Create a QgsVectorLayer
                      QgsVectorLayer *vlayer = new QgsVectorLayer(shpFilePath, "shapefile_layer", "ogr"); // "ogr" is the data provider
                  
                      // 5. Check if the layer is valid
                      if (!vlayer->isValid()) {
                          qDebug() << "Error: Could not load shapefile:" << vlayer->error().message();
                          delete vlayer;
                          QgsApplication::exit();
                          return 1;
                      }
                  
                      // 6.  Accessing Feature Information (Example)
                      qDebug() << "Number of features:" << vlayer->featureCount();
                  
                  
                      // 7. Clean up
                      delete vlayer;  // Important to prevent memory leaks
                      QgsApplication::exit();
                  
                      return 0;
                  }
                  
                  jsulmJ 1 Reply Last reply
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                  • A Aman55

                    @jsulm Yes release build work for the above main.cpp code. currently used to load shp file and gives error
                    C:\OSGeo4W\apps\qgis-ltr-dev\include\qgsabstractgeometry.h:596: error: C2065: 'M_PI': undeclared identifier
                    C:\OSGeo4W\apps\qgis-ltr-dev\include\qgsvector.h:175: error: C2065: 'M_PI': undeclared identifier
                    C:\OSGeo4W\apps\qgis-ltr-dev\include\qgsgeometry.h:2757: error: C2065: 'M_PI': undeclared identifier

                    // main.cpp
                    int main(int argc, char *argv[]) {
                        QApplication a(argc, argv);
                        // 1. Initialize QGIS
                        QgsApplication::setPrefixPath("C:/OSGeo4W64/apps/qgis-ltr-dev", true); // Replace with your QGIS installation path
                        QgsApplication::init();
                    
                        // 2. Specify the path to your SHP file
                        QString shpFilePath = ":/gis_osm_barriers_07_1.shp"; // Replace with the actual path
                    
                        // 3. Check if the file exists
                        QFileInfo fileInfo(shpFilePath);
                        if (!fileInfo.exists()) {
                            qDebug() << "Error: Shapefile not found at" << shpFilePath;
                            QgsApplication::exit();
                            return 1;
                        }
                    
                    
                        // 4. Create a QgsVectorLayer
                        QgsVectorLayer *vlayer = new QgsVectorLayer(shpFilePath, "shapefile_layer", "ogr"); // "ogr" is the data provider
                    
                        // 5. Check if the layer is valid
                        if (!vlayer->isValid()) {
                            qDebug() << "Error: Could not load shapefile:" << vlayer->error().message();
                            delete vlayer;
                            QgsApplication::exit();
                            return 1;
                        }
                    
                        // 6.  Accessing Feature Information (Example)
                        qDebug() << "Number of features:" << vlayer->featureCount();
                    
                    
                        // 7. Clean up
                        delete vlayer;  // Important to prevent memory leaks
                        QgsApplication::exit();
                    
                        return 0;
                    }
                    
                    jsulmJ Offline
                    jsulmJ Offline
                    jsulm
                    Lifetime Qt Champion
                    wrote on last edited by
                    #11

                    @Aman55 Then you probably only have the release versions of these libs which can't be mixed with a debug build.

                    "Yes release build work for the above main.cpp code. currently used to load shp file and gives error" - I don't get it. How can it work if you get compiler errors? What is the very first error?

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

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                    1
                    • A Offline
                      A Offline
                      Aman55
                      wrote on last edited by Aman55
                      #12

                      @jsulm Previously i have only use qgsapplication header as

                      #include <QApplication>
                      #include <qgsapplication.h>
                      
                      
                      int main(int argc, char *argv[])
                      {
                        QgsApplication app(argc, argv, true);
                        QgsApplication::setPrefixPath("C:/OSGeo4W64/apps/qgis-ltr-dev", true);
                      
                        int retval = app.exec();
                      //  QgsApplication::exitQgis();
                        return retval;
                      }
                      
                      

                      so there is no need for other headerfiles. then it build successfully. Now i am reading shp file where it does not locate M_PI Macro

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                      • A Offline
                        A Offline
                        Aman55
                        wrote on last edited by Aman55
                        #13

                        it build successfully but giving some runtime error unable to pinpoint as it only gives The program has unexpectedly finished. After including #include <qgsapplication.h>

                        JonBJ 1 Reply Last reply
                        0
                        • A Aman55

                          it build successfully but giving some runtime error unable to pinpoint as it only gives The program has unexpectedly finished. After including #include <qgsapplication.h>

                          JonBJ Offline
                          JonBJ Offline
                          JonB
                          wrote on last edited by
                          #14

                          @Aman55 So far as I can see you have not tried to show the stack trace from a debugger when it crashes.

                          A 1 Reply Last reply
                          0
                          • JonBJ JonB

                            @Aman55 So far as I can see you have not tried to show the stack trace from a debugger when it crashes.

                            A Offline
                            A Offline
                            Aman55
                            wrote on last edited by Aman55
                            #15

                            @JonB In debug mode i got error of CDB process terminatedScreenshot (7).png

                            JonBJ 1 Reply Last reply
                            0
                            • A Aman55

                              @JonB In debug mode i got error of CDB process terminatedScreenshot (7).png

                              JonBJ Offline
                              JonBJ Offline
                              JonB
                              wrote on last edited by
                              #16

                              @Aman55 Yes, you need to look at the stack trace pane in the debugger when that happens, so that you know where it comes from.

                              1 Reply Last reply
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