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            brent's hut

            trap in CreateCompatibleBitmap and memory dc

                    CDC dcMem;
                    VERIFY(dcMem.CreateCompatibleDC(NULL));
                    CBitmap bmp;
                    VERIFY(bmp.CreateCompatibleBitmap(
            &dc,100,100));
                    CBitmap 
            * pOld = dcMem.SelectObject(&bmp);
                    dcMem.FillSolidRect(
            0,0,100,100,RGB(255,0,0));
                    dcMem.MoveTo(
            0,0);
                    dcMem.LineTo(
            100,100);
                    dc.BitBlt(
            0,0,100,100,&dcMem,0,0,SRCCOPY);
                    dcMem.SelectObject(pOld);
            these codes will run smoothly. but you will get nothing other a bitmap either black or white.

            See what MSDN says:

            CBitmap::CreateCompatibleBitmap

            If pDC is a memory device context, the bitmap returned has the same format as the currently selected bitmap in that device context.

            When a memory device context is created, GDI automatically selects a monochrome stock bitmap for it.


            Solution:
            1) pass in  a CPaintDC instead of a memory dc
            2) just replace VERIFY(bmp.CreateCompatibleBitmap(&dc,100,100)); with bmp.CreateBitmap(100,100,1,32,NULL);

            posted on 2008-07-14 17:15 brent 閱讀(1089) 評論(0)  編輯 收藏 引用 所屬分類: Windows

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