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Large resoution grabbing issue with OpenCV 2.4.2?

I don't know whats wrong with OpenCV 2.4.2 with Visual Stuio 2010. I am trying to grab Camera frame that has 1280x1024 resolution. But OpenCV 2.4.2 always grab only 640x480 resolution. Why ? On the other hand, OpenCV 1.1pre working fine. What to do in this kind of issue ? I do not want 1.1pre, kindly give me the solution. Thanks.

These subrotinues I am using.

CvCapture* WebCAMinit = cvCaptureFromCAM(arg);
IplImage* imageRGB = cvQueryFrame(WebCAMinit);