Have you called cvNamedWindow yet? It will not work without cvNamedWindow.
http://stackoverflow.com/questions/7697819/why-cvwaitkey0-doesnt-work
cvWaitKey 如果 cvNamedWindow就不会起作用,布布扣,bubuko.com
cvWaitKey 如果 cvNamedWindow就不会起作用
原文：http://www.cnblogs.com/okgogo2000/p/3820398.html