Undefined symbols for architecture x86_64: "QWidget::KeyPressEvent(QKeyEvent*)"

mchung

Now I understand from searching for a few hours this means that there virtual function that has not been implemented or a v table value that has been missing, I have been trying for the past 4 hours and no luck just to compile a core profile opengl program, from the 4.8 documentation. This is my first time using the QT Frame work so if someone can help me out that would be great =).

It appears I have implemented the KeyPressEvent virtual function in RenderMii.cpp but its coming up with another error as you can see in the compile error. I am using QTCreator with Clang and I also tried GCC didn't work as well.

moc_rendermii.o -F/Developer/QtSDK/Desktop/Qt/4.8.0/gcc/lib -L/Developer/QtSDK/Desktop/Qt/4.8.0/gcc/lib -framework QtOpenGL -framework QtGui -framework QtCore -framework OpenGL -framework AGL
Undefined symbols for architecture x86_64:
"QWidget::KeyPressEvent(QKeyEvent*)", referenced from:
RenderMii::KeyPressEvent(QKeyEvent*) in rendermii.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [RenderMii.app/Contents/MacOS/RenderMii] Error 1
make: Leaving directory `/Users/MichaelChung/projects/RenderMii'
15:47:23: The process "/usr/bin/make" exited with code 2.
Error while building project RenderMii (target: Desktop)
When executing build step 'Make'

mchung

Here is some code

@
#include <QCoreApplication>
#include <QGLWidget>
#include <QGLBuffer>
#include <QGLShaderProgram>
#include <QKeyEvent>

class RenderMii : public QGLWidget
{
Q_OBJECT

public:
RenderMii(const QGLFormat & gl_format,QWidget * parent = 0);
~RenderMii();

protected:
virtual void InitializeGL();
virtual void ResizeGL(int w, int h);
virtual void PaintGL();

virtual void KeyPressEvent(QKeyEvent * e);

private:
bool PrepareShaderProgram(const QString & vertex_shader_path,
const QString & fragment_shader_path);
QGLShaderProgram m_shader;
QGLBuffer m_vertex_buffer;

};

void RenderMii::KeyPressEvent(QKeyEvent * e )
{
switch ( e->key() )
{
case Qt::Key_Escape:
QCoreApplication::instance()->quit();
break;

default:
    QGLWidget::KeyPressEvent( e );
}

}
@

[[marked up code, Tobias]]

goetz

It's QGLWidget::keyPressEvent( e ) - with a lowercase k. Then for your own method name too, of course, otherwise it wouldn't be a reimplementation of a virtual method, but a completely new method.

mchung

Hey thanks for replying I got it working silly me I renamed functions with capitals instead of overriding them correctly I forgot that I was overriding members from the base class, anyways thats all fixed and I just learned that RC doesn't support osx lion correctly and the opengl context isn't created properly when I write the shader it tells me #version 150 glsl is not supported which is true since the context set up is version 1.0 opengl :S