nothing while waiting. actually I am using double buffer to receive pictures from a camera. Its sdk posts an event when a picture finishes to be sent to a buffer.
the working loop is like this:
Qt Code: 
  1. for (int k = 0; k<8; k++)
  2. 	    {
  3. 		//double buffer
  4. 		ready=WaitForMultipleObjects(2,hEvents,false,2000);
  5. 		if (ready==WAIT_OBJECT_0)
  6. 		{
  7. 		    PCO_AddBufferEx(hCam,0,0,sBufNr1, xRes, yRes, 0x000e);
  8. 		    for (int l = 0; l<xRes * yRes; l++)bitMap[l+mapOffset] = data1[l];
  9. 		    Update();
  10. 		}
  11. 		else
  12. 		{
  13. 		    if(ready==(WAIT_OBJECT_0+1))
  14. 		    {
  15. 			PCO_AddBufferEx(hCam,0,0,sBufNr2, xRes, yRes, 0x000e);
  16. 			SetPort(false);
  17. 			for (int l = 0; l<xRes * yRes; l++)bitMap[l+mapOffset] = data2[l];
  18. 			Update();
  19. 		    }
  20. 		    else{
  21. 			PCO_SetRecordingState(hCam,0);
  22. 			abort = true;
  23. 		    }
  24. 		}
  25. 	    }
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