Bitmap saving problem

Hi all!

i'm trying to load an image into a dialog window, shrink it, then save that shrinked image back to the disk. i shrink it like this:

Code:

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StretchBlt(g_hMemDC, 0, 0, SCREENWIDTH, SCREENHEIGHT,hdcDesk,0,0,SCREENWIDTH*2,SCREENHEIGHT*2,SRCCOPY);

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Problem is that the dlg area which dosen't occupy the shrinked image becomes black, and when i save the image the black part is also saved as the bmp. Howto save only the shrinked image, without the black area?

Thanx for any help.

I guess you need to resize (create another one?) your g_hMemDC?

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Mats

Create another bitmap in memory with CreateBitmap() or whatever it is, with the new shrunk dimensions, fill it with your HDC, then save it to disk.

thx that worked.

Code:

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::StretchBlt(g_hMemDC, 0, 0, SCREENWIDTH, SCREENHEIGHT,hdcDesk,0,0,SCREENWIDTH*2,SCREENHEIGHT*2,SRCCOPY);
        HBITMAP hbmpshrnk = CreateCompatibleBitmap(g_hMemDC, SCREENWIDTH/2, SCREENHEIGHT/2);
...
        PBITMAPINFO bmpinfo = CreateBitmapInfoStruct(hwndgl, hbmpshrnk);
        CreateBMPFile(hwndgl,"desktoptemp.bmp",bmpinfo,g_hDeskBmp,g_hMemDC);

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