#168 ctypes.ArgumentError in glReadPixels

[Anonymous]

We're running problems with glReadPixels throwing an exception. Here's the backtrace:

Traceback (most recent call last):
File "/store/home/mukaissi/MetNetVis/MetNetVis/UI/graphdrawwidget.py", line 155, in mousePressEvent
index=GL.glReadPixels(event.x,event.y,1,1,GL.GL_RGB,GL.GL_UNSIGNED_BYTE)
File "/store/home/mukaissi/software/PyOpenGL-3.0.0a6/OpenGL/GL/images.py", line 279, in glReadPixels
ctypes.c_void_p( arrayType.dataPointer(array))
ctypes.ArgumentError: argument 1: <type 'exceptions.TypeError'>: wrong type

Adding a few prints to see the types of the involved variables they seem to be ok:

array: [[[0 0 0]]] <type 'numpy.ndarray'>
arrayType: <class 'OpenGL.arrays.arraydatatype.GLubyteArray'> <type '_ctypes.PointerType'>
dataPointer: 20509152 <type 'long'>

This is using 3.0.0a6 on an x86_64 (RHEL) system.

[Mike C. Fletcher]

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Closing duplicate