glReadPixel operation

[aibin]

Hi,
I am new to iPhone development and would like to use glReadPixel operation in a sample application I am developing. The read should happen from the back buffer. Though read pixel is giving me a color from the frame buffer, the value doesn't look right. I suspect the read is happening from the front buffer.
Can somebody help me?

[aibin]

Problem solved... The buffer used should be unsigned byte

GLubyte pColor[4];
glReadPixels(X,Y,1,1,GL_RGBA,GL_UNSIGNED_BYTE,&pCo lor[0]);

Earlier it was:

Byte pColor[4];
glReadPixels(X,Y,1,1,GL_RGBA,GL_BYTE,&pColor[0]);

I don't have an explanation why this doesn't work though...