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DirectDrawClipper error

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Hello everyone! I have a problem. I create a DirectDrawClipper from (0,0) to (641 to 481) and then function returns DD_OK. But when I use Blt in (0,0, 32, 32) the image doesn´t appear. I think that the clipper is ok because I use Blt in (-5,10, 10,25) and the image appear. What´s wrong? Thanks Juan

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I have already solve my problem.

The program lack of this line of code:

lpddclipper->SetHWnd(0, hWindow);

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