Need help for glReadPixels

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Extron

Global pixMap:TPixMap = CreatePixmap(640 , 480 , PF_RGB888)
Global i_ptr:Byte Ptr=PixmapPixelPtr(pixMap)

bglDrawText "This Will Take No Time..." , 10 , 10
bglDrawText "When It will Finish press Space To go to Max2d" , 10 , 50
bglSwapBuffers
glReadBuffer(GL_FRONT)

glReadPixels(0 , 0 , 640 , 480 , GL_RGB , GL_UNSIGNED_BYTE , i_ptr)
pixmap = YFlipPixmap(pixMap)

Oops! A small error. ;)
Changing "glReadPixels(etc...) to "glReadPixels(0 , 0 , 640 , 480 , GL_RGB , GL_UNSIGNED_BYTE , i_ptr)"

And this work also for RGBA like this :

Global pixMap:TPixMap = CreatePixmap(640 , 480 , PF_RGBA8888)
Global i_ptr:Byte Ptr=PixmapPixelPtr(pixMap)

bglDrawText "This Will Take No Time..." , 10 , 10
bglDrawText "When It will Finish press Space To go to Max2d" , 10 , 50
bglSwapBuffers
glReadBuffer(GL_FRONT)

glReadPixels(0 , 0 , 640 , 480 , GL_RGBA , GL_UNSIGNED_BYTE , i_ptr)
pixmap = YFlipPixmap(pixMap)