为什么cvWaitKey（0）不起作用？

Question

I'm not sure why, but for a mysterious reason my c++ application doesn't wait anymore when it reaches cvWaitKey(0) it just passes this line, like this function doesn't do anything! I also tried cvWaitKey(100000) it doesn't work either...

void main() {
   cvWaitKey(0);
   return;
}

My project is a little complex, I'm using Visual Studio 2010 and It includes opencv ffmpeg pthread winsocks and some other libraries.

Can you guess why this happens?

Answer 1

Have you called cvNamedWindow yet? It will not work without cvNamedWindow .

Answer 2

I've had the issue myself a few times, but I can only speculate on what causes this. I can offer a work-around though:

while(1){
  int key=cvWaitKey(10);
  if(key==27) break;
}

This will block until ESC is pressed.