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Qt and QGis integration ERROR `__imp__ZN14QgsApplicationC1ERiPPcbRK7QStringS5_'

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  • 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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            • 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
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                • 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
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                  • 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
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                    • 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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