glReadPixels and vectors

[gareth19]

Im trying to use this call like so:

// .h
std::vector<BYTE> m_pix;

// .cpp (onrender)
m_pix.resize( m_nWidth * m_nHeight );
glReadPixels( 0, 0, m_nWidth, m_nHeight, GL_RGB, GL_UNSIGNED_BYTE, reinterpret_cast<LPVOID>( &m_pix ) );


This crashes...memory issue?
How can i use vectors with this call?

TIA

[Philip Nicoletti]

You need to send the address of the first element :


.... &m_pix[0] ..) // &m_pix[0] instead of &m_pix

[cvogt61457]

Can you post the prototype found in the header file for glReadPixels?

[wien]

http://www.mevis.de/~uwe/opengl/glReadPixels.html

[wien]

You should possibly also change the cast to GLvoid* instead of LPVOID. It doesn't matter much, as they're the same thing, but you might as well use the OpenGL types to be on the safe side.