parkerlived

Hello sir: I am Programming UVC avstream driver for months, but I met one problem,that is : in XP system, I used the WIA to snapshot the still image,the Wia will pop a message "the camera is processing your request",in the same time I could see the debug message of my driver's Snapshot routine appeared in DebugView window, the message seemed it was normal (because in the same condition, that I used the Graphedit and AMCap can get the Still Image),but the Wia couldn't get the Still Image,by the way,the preview function is normal. On the other hand, I tested my driver in Vista using Graphedit and AMCap to get still image were normal as in XP.So, Where am I missing the key point? Wish you can help me, please. parkerlived