Selection, picking with PyOpenGL?

[kupendra]

I am using python with Qt from past 1 year.. now i have to use pyqt with opengl.
i am tring to write a sample program which can able to draw object ( eg cube,dot) and user can able to select using mouse.
but now i have done all the possible way to use opengl functions but still not able to select :(

I am using folowing code to pick :

    def pick3d( self, event ):
 
        # 1. initialization
 
        x = event.x()
        y = event.y()
        pixels = 5
        buffer_size = 512
        viewport = GL.glGetIntegerv(GL.GL_VIEWPORT)
 
        # 2. selection logic
        GL.glSelectBuffer(buffer_size)
        GL.glRenderMode(GL.GL_SELECT)
        GL.glInitNames()
        GL.glPushName(0);
        GL.glMatrixMode(GL.GL_PROJECTION)
        GL.glPushMatrix()
        GL.glLoadIdentity() 
 
        #This Creates A Matrix That Will Zoom Up To A Small Portion Of The Screen, Where The Mouse Is.
        GLU.gluPickMatrix(x, (viewport[3]-y), 5, 5, viewport)
        #Apply The Perspective Matrix
        GLU.gluPerspective(45, (viewport[2]-viewport[0])/(viewport[3]-viewport[1]), 0.1, 100.0);
 
        GL.glMatrixMode(GL.GL_MODELVIEW)                                    #Select The Modelview Matrix
        GL.glLoadIdentity()                                           #Reset The Modelview Matrix
        GL.glTranslatef(0.0,0.0,-10.0)                                #Move Into The Screen 20 Units
 
#        previousviewmatrix = GL.glGetDoublev(GL.GL_PROJECTION_MATRIX)
#        GL.glLoadIdentity()
#        GLU.gluPickMatrix( x, viewport[3]-y, 5, 5, viewport )
#        GL.glMultMatrixd(previousviewmatrix)
#        GL.glMatrixMode(GL.GL_MODELVIEW)
        self.makeObject(True)
 
        GL.glMatrixMode(GL.GL_PROJECTION) #Select The Projection Matrix
        GL.glPopMatrix() # Pop The Projection Matrix
        GL.glMatrixMode(GL.GL_MODELVIEW) # Select The Modelview Matrix
        self.buffer=GL.glRenderMode(GL.GL_RENDER)        
 
#        GL.glFlush()
#        GL.glMatrixMode(GL.GL_PROJECTION)
#        GL.glLoadMatrixd(previousviewmatrix)
#        self.buffer = GL.glRenderMode(GL.GL_RENDER)
#        
#        # 3. update graphics
#        self.updateGL()
 
        # 4. process selction buffer if control is pressed        
        return self.processBuffer()
 
    def processBuffer(self):
        print len(self.buffer)
        print "--------- pick3d ----------"
        print " - nhits =", len( self.buffer )
        if( len(self.buffer) == 0 ): print "hit nothing"
        else:
            min = self.buffer[0][0]
        for record in self.buffer:
           minDepth, maxDepth, names = record
           # add all hit objects to selectedObjects
           for i in range(len(names)):
               if(self.selected.count(names[i]) == 1):
                   print " - unselected: ", names[i]
                   self.selected.remove(names[i])
               else:
                   self.selected.append(names[i])                 
        print " - selectedObjects: ", self.selected
 
        return self.selected

can any one help me.. please give me any working simple program for selection