I am programming in Netbeans, using MSYS, Qt, mingw and openGL and want to

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Editorial Team

Asked: May 30, 20262026-05-30T08:31:43+00:00 2026-05-30T08:31:43+00:00

I am programming in Netbeans, using MSYS, Qt, mingw and openGL and want to

0

I am programming in Netbeans, using MSYS, Qt, mingw and openGL and want to know how to solve linker problems.

myWindow.h

#ifndef _MYWINDOW_H
#define _MYWINDOW_H

#include <QtOpenGL/QGLWidget>

class myWindow : public QGLWidget{
public:
    myWindow(QGLWidget* parent = 0);
private:
    void initializeGL();
    void paintGL();
    void resizeGL(int w, int  h);
    void drawCircle(int tr_x, int tr_y, float size);
};

#endif  /* _MYWINDOW_H */

myWindow.cpp

#include "myWindow.h"
#include <QtGui/QtGui>
#include <GL/glu.h>
#include <GL/gl.h>

myWindow::myWindow(QGLWidget* parent):QGLWidget(parent){
    setWindowTitle("lab1");
}

GLfloat circle[20][2] = {
{1, 0}, {0.951057, 0.309017}, {0.809017, 0.587785}, {0.587786, 0.809017},
{0.309018, 0.951056}, {0, 1}, {-0.309016, 0.951057}, {-0.587784, 0.809018},
{-0.809016, 0.587787}, {-0.951056, 0.309019},{-1, 0}, {-0.951057, -0.309014},
{-0.809019, -0.587783}, {-0.587788, -0.809015}, {-0.30902, -0.951055}, {0, -1},
{0.309013, -0.951058}, {0.587782, -0.80902}, {0.809014, -0.587789}, {0.951055, -0.309021}};

void myWindow::initializeGL(){
   qglClearColor(Qt::gray); 
   glEnable(GL_DEPTH_TEST);
   glShadeModel(GL_FLAT);
   glEnable(GL_CULL_FACE);
}

void myWindow::paintGL(){
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

   glMatrixMode(GL_MODELVIEW);
   glLoadIdentity();
   //glScalef(2, 2, 1);

   qglColor(Qt::white);

   renderText(-50, 150 , 0, QString::fromUtf8("This is a snowman!!!"), QFont());

   qglColor(Qt::black);
   drawCircle(10, 75, 3); //eye1
   drawCircle(-10, 75, 3); // eye2

   glLineWidth(3.0f);
   qglColor(Qt::red);
   glBegin(GL_LINES);
      glVertex2f(-10, 60);
      glVertex2f(0, 55);
      glVertex2f(0, 55);
      glVertex2f(10, 60);
   glEnd();

   glLineWidth(5.0f);
   qglColor(Qt::black);
   glBegin(GL_LINES);
      glVertex2f(-70, 10);
      glVertex2f(-38, 5);

      glVertex2f(38, 5);
      glVertex2f(70, 10);
   glEnd();

   qglColor(Qt::green);
   glBegin(GL_POLYGON);
      glVertex2f(-15, 120);
      glVertex2f(-20, 90);
      glVertex2f(20, 90);
      glVertex2f(15, 120);
   glEnd();

   QColor white(255, 255, 255, 255);
   qglColor(white);
   drawCircle(0, 65, 30);
   drawCircle(0, 0, 40);
   drawCircle(0, -85, 50);

   glFlush();
}

void myWindow::resizeGL(int w, int h){
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();

   gluOrtho2D(-w/2, w/2, -h/2, h/2);
   // Update OpenGL viewport and internal variables
   glViewport(0,0,w,h);
}

void myWindow::drawCircle(int tr_x, int tr_y, float size){
    int i;

    glBegin(GL_POLYGON);
    for(i = 0; i < 20; i++)
            glVertex2f(circle[i][0]*size+tr_x, circle[i][1]*size+tr_y);
    glEnd();
}

main.cpp

#include <QtGui/QApplication>
#include "myWindow.h"

int main(int argc, char *argv[]) {
    // initialize resources, if needed
    // Q_INIT_RESOURCE(resfile);

    QApplication app(argc, argv);

    myWindow win;
    win.show();

    // create and show your widgets here

    return app.exec();
}

NetBeans output:

/usr/bin/make -f nbproject/Makefile-Debug.mk SUBPROJECTS= .build-conf
make[1]: Entering directory `/c/Users/Galym/Documents/NetBeansProjects/qt'
/C/Qt/4.8.0/bin/qmake.exe VPATH=. -o qttmp-Debug.mk nbproject/qt-Debug.pro
mv -f qttmp-Debug.mk nbproject/qt-Debug.mk
/usr/bin/make -f nbproject/qt-Debug.mk dist/Debug/MinGW-Windows/qt.exe
make[2]: Entering directory `/c/Users/Galym/Documents/NetBeansProjects/qt'
g++.exe -c -g -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_GUI_LIB -DQT_CORE_LIB -DQT_HAVE_MMX -DQT_HAVE_3DNOW -DQT_HAVE_SSE -DQT_HAVE_MMXEXT -DQT_HAVE_SSE2 -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I'c:/Qt/4.8.0/include/QtCore' -I'c:/Qt/4.8.0/include/QtGui' -I'c:/Qt/4.8.0/include' -I'c:/Qt/4.8.0/include/ActiveQt' -I'.' -I'nbproject' -I'.' -I'c:/Qt/4.8.0/mkspecs/default' -o build/Debug/MinGW-Windows/myWindow.o myWindow.cpp
g++.exe -c -g -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_GUI_LIB -DQT_CORE_LIB -DQT_HAVE_MMX -DQT_HAVE_3DNOW -DQT_HAVE_SSE -DQT_HAVE_MMXEXT -DQT_HAVE_SSE2 -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I'c:/Qt/4.8.0/include/QtCore' -I'c:/Qt/4.8.0/include/QtGui' -I'c:/Qt/4.8.0/include' -I'c:/Qt/4.8.0/include/ActiveQt' -I'.' -I'nbproject' -I'.' -I'c:/Qt/4.8.0/mkspecs/default' -o build/Debug/MinGW-Windows/main.o main.cpp
windres -i qt_resource.rc -o build/Debug/MinGW-Windows/qt_resource_res.o --include-dir=. -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_GUI_LIB -DQT_CORE_LIB -DQT_HAVE_MMX -DQT_HAVE_3DNOW -DQT_HAVE_SSE -DQT_HAVE_MMXEXT -DQT_HAVE_SSE2 -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN
g++ -mthreads -Wl,-subsystem,windows -o dist/Debug/MinGW-Windows/qt.exe build/Debug/MinGW-Windows/myWindow.o build/Debug/MinGW-Windows/main.o  -L'c:/Qt/4.8.0/lib' -lmingw32 -lqtmaind build/Debug/MinGW-Windows/qt_resource_res.o -lglu32 -lopengl32 -lgdi32 -luser32 -lQtGuid4 -lQtCored4 
build/Debug/MinGW-Windows/myWindow.o: In function `myWindow':
C:\Users\Galym\Documents\NetBeansProjects\qt/myWindow.cpp:13: undefined reference to `_imp___ZN9QGLWidgetC2EP7QWidgetPKS_6QFlagsIN2Qt10WindowTypeEE'
C:\Users\Galym\Documents\NetBeansProjects\qt/myWindow.cpp:15: undefined reference to `_imp___ZN9QGLWidgetD2Ev'
C:\Users\Galym\Documents\NetBeansProjects\qt/myWindow.cpp:13: undefined reference to `_imp___ZN9QGLWidgetC2EP7QWidgetPKS_6QFlagsIN2Qt10WindowTypeEE'
C:\Users\Galym\Documents\NetBeansProjects\qt/myWindow.cpp:15: undefined reference to `_imp___ZN9QGLWidgetD2Ev'
build/Debug/MinGW-Windows/myWindow.o:C:\Users\Galym\Documents\NetBeansProjects\qt/myWindow.cpp:25: undefined reference to `_imp___ZNK9QGLWidget13qglClearColorERK6QColor'
build/Debug/MinGW-Windows/myWindow.o:C:\Users\Galym\Documents\NetBeansProjects\qt/myWindow.cpp:38: undefined reference to `_imp___ZNK9QGLWidget8qglColorERK6QColor'
build/Debug/MinGW-Windows/myWindow.o:C:\Users\Galym\Documents\NetBeansProjects\qt/myWindow.cpp:40: undefined reference to `_imp___ZN9QGLWidget10renderTextEdddRK7QStringRK5QFonti'
build/Debug/MinGW-Windows/myWindow.o:C:\Users\Galym\Documents\NetBeansProjects\qt/myWindow.cpp:42: undefined reference to `_imp___ZNK9QGLWidget8qglColorERK6QColor'
build/Debug/MinGW-Windows/myWindow.o:C:\Users\Galym\Documents\NetBeansProjects\qt/myWindow.cpp:47: undefined reference to `_imp___ZNK9QGLWidget8qglColorERK6QColor'
build/Debug/MinGW-Windows/myWindow.o:C:\Users\Galym\Documents\NetBeansProjects\qt/myWindow.cpp:56: undefined reference to `_imp___ZNK9QGLWidget8qglColorERK6QColor'
build/Debug/MinGW-Windows/myWindow.o:C:\Users\Galym\Documents\NetBeansProjects\qt/myWindow.cpp:65: undefined reference to `_imp___ZNK9QGLWidget8qglColorERK6QColor'
build/Debug/MinGW-Windows/myWindow.o:C:\Users\Galym\Documents\NetBeansProjects\qt/myWindow.cpp:74: undefined reference to `_imp___ZNK9QGLWidget8qglColorERK6QColor'
build/Debug/MinGW-Windows/myWindow.o:myWindow.cpp:(.rdata$_ZTV8myWindow[vtable for myWindow]+0x8): undefined reference to `QGLWidget::metaObject() const'
build/Debug/MinGW-Windows/myWindow.o:myWindow.cpp:(.rdata$_ZTV8myWindow[vtable for myWindow]+0xc): undefined reference to `QGLWidget::qt_metacast(char const*)'
build/Debug/MinGW-Windows/myWindow.o:myWindow.cpp:(.rdata$_ZTV8myWindow[vtable for myWindow]+0x10): undefined reference to `QGLWidget::qt_metacall(QMetaObject::Call, int, void**)'
build/Debug/MinGW-Windows/myWindow.o:myWindow.cpp:(.rdata$_ZTV8myWindow[vtable for myWindow]+0x1c): undefined reference to `QGLWidget::event(QEvent*)'
build/Debug/MinGW-Windows/myWindow.o:myWindow.cpp:(.rdata$_ZTV8myWindow[vtable for myWindow]+0x54): undefined reference to `QGLWidget::paintEngine() const'
build/Debug/MinGW-Windows/myWindow.o:myWindow.cpp:(.rdata$_ZTV8myWindow[vtable for myWindow]+0x84): undefined reference to `QGLWidget::paintEvent(QPaintEvent*)'
build/Debug/MinGW-Windows/myWindow.o:myWindow.cpp:(.rdata$_ZTV8myWindow[vtable for myWindow]+0x8c): undefined reference to `QGLWidget::resizeEvent(QResizeEvent*)'
build/Debug/MinGW-Windows/myWindow.o:myWindow.cpp:(.rdata$_ZTV8myWindow[vtable for myWindow]+0xe8): undefined reference to `QGLWidget::updateGL()'
build/Debug/MinGW-Windows/myWindow.o:myWindow.cpp:(.rdata$_ZTV8myWindow[vtable for myWindow]+0xec): undefined reference to `QGLWidget::updateOverlayGL()'
build/Debug/MinGW-Windows/myWindow.o:myWindow.cpp:(.rdata$_ZTV8myWindow[vtable for myWindow]+0xfc): undefined reference to `QGLWidget::initializeOverlayGL()'
build/Debug/MinGW-Windows/myWindow.o:myWindow.cpp:(.rdata$_ZTV8myWindow[vtable for myWindow]+0x100): undefined reference to `QGLWidget::resizeOverlayGL(int, int)'
build/Debug/MinGW-Windows/myWindow.o:myWindow.cpp:(.rdata$_ZTV8myWindow[vtable for myWindow]+0x104): undefined reference to `QGLWidget::paintOverlayGL()'
build/Debug/MinGW-Windows/myWindow.o:myWindow.cpp:(.rdata$_ZTV8myWindow[vtable for myWindow]+0x108): undefined reference to `QGLWidget::glInit()'
build/Debug/MinGW-Windows/myWindow.o:myWindow.cpp:(.rdata$_ZTV8myWindow[vtable for myWindow]+0x10c): undefined reference to `QGLWidget::glDraw()'
build/Debug/MinGW-Windows/myWindow.o:myWindow.cpp:(.rdata$_ZTV8myWindow[vtable for myWindow]+0x124): undefined reference to `non-virtual thunk to QGLWidget::paintEngine() const'
build/Debug/MinGW-Windows/myWindow.o: In function `~myWindow':
C:\Users\Galym\Documents\NetBeansProjects\qt/myWindow.h:13: undefined reference to `_imp___ZN9QGLWidgetD2Ev'
C:\Users\Galym\Documents\NetBeansProjects\qt/myWindow.h:13: undefined reference to `_imp___ZN9QGLWidgetD2Ev'
collect2: РІС‹РїРѕР»РЅРµРЅРёРµ ld Р·Р°РІРµСЂС€РёР»РѕСЃСЊ СЃ РєРѕРґРѕРј РІРѕР·РІСЂР°С‚Р° 1
make[2]: *** [dist/Debug/MinGW-Windows/qt.exe] Error 1
make[2]: Leaving directory `/c/Users/Galym/Documents/NetBeansProjects/qt'
make[1]: *** [.build-conf] Error 2
make[1]: Leaving directory `/c/Users/Galym/Documents/NetBeansProjects/qt'
make: *** [.build-impl] Error 2
BUILD FAILED (exit value 2, total time: 7s)

Environment variable PATH = C:\mingw\bin;C:\Qt\4.8.0\bin;

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1 Answer

Editorial Team · Answer 1 · 2026-05-30T08:31:44+00:00

It would appear that you’re not including the QtOpenGL module in your compilation (or more specifically, linking) process.

If you’re using .pro files for your project, you would need to add QT += opengl to it, to tell qmake that you’re using QtOpenGL. Other build systems might need you to do different things.

When using NetBeans to manage the configuration, if you go into the Project properties, under Build -> Qt, there should be checkboxes for the various Qt modules, including QtOpenGL. Here you can enable/disable the linking to any of the Qt modules.

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