I found something interesting I hope someone can explain to me this behaviour.

Following this example if I use the regular code (around line 108) :

while(_running)
{
  cvGetImageRawData(pCapImage, &pCapBuffer;);
  CLEyeCameraGetFrame(_cam, pCapBuffer);
  cvShowImage(_windowName, pCapImage);
}

The pCapBuffer is updated, BUT if I just do:

while(_running)
{ 
  CLEyeCameraGetFrame(_cam, pCapBuffer);   
}

pCapBuffer remais NULL! So for what I see CLEyeCameraGetFrame() just updates pCapBuffer when someone “consumes” it…what I don’t get is how does CLEyeCameraGetFrame() knows that the buffer was read? I was expecting the pCapBuffer to be updated everytime I called CLEyeCameraGetFrame()....is this the regular behaviour for this function or my system has a problem? How can I make CLEyeCameraGetFrame() update the buffer without having to copy it?

Also if someone could point me out how to make a QImage out of this pCapBuffer it will be very helpful!

I answered it in here:

http://stackoverflow.com/questions/20851840/reading-a-pseye-camera-frame

The data inside the pCapBuffer is updated every time. The difference is that in your first code snippet, you show this change by calling cvShowImage(_windowName, pCapImage), wheres in the second one, the window is not being updated and therefore no change is shown.

Thanks AlexP, I am new to OpenCV and C++, took me a while to understand how things work “inside the hood”