Question

HBITMAP Resizing/Streching

Asked by: CSecurity

Hi

I have this code to resize any image in HBITMAP to 320 * 240.

Look:

      HDC hDC = hScrDC;
      HDC hMemDC1 = CreateCompatibleDC(hDC);
      HBITMAP hBitmap1 = CreateCompatibleBitmap(hDC,320,240);
      HGDIOBJ hOld1 = SelectObject(hMemDC1, hBitmap1);
 
      HDC hMemDC2 = CreateCompatibleDC(hDC);
      HGDIOBJ hOld2 = SelectObject(hMemDC2, hBitmap);
 
      BITMAP bitmap = { 0 };
      GetObject(hBitmap, sizeof(BITMAP), &bitmap);

      StretchBlt(hMemDC1, 0, 0, 320, 240, hMemDC2, 0, 0, nWidth, nHeight, SRCCOPY);
 
      SelectObject(hMemDC1, hOld1);
      SelectObject(hMemDC2, hOld2);
      DeleteDC(hMemDC1);
      DeleteDC(hMemDC2);

It works if nWidth and nHeight (src image width and size is 320 * 240). But it means no change. But when I make it larger or smaller I can't get 320 * 240 image.

Any ideas?

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Asked On
2009-11-08 at 09:27:20ID24881747
Topics

C++ Programming Language

,

Microsoft Visual C++

,

C Programming Language

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Answers

 

by: jkrPosted on 2009-11-08 at 09:51:42ID: 25771184

Should work with any size (not to speak of the quality of the result, but...) - what error do you get?

 

by: CSecurityPosted on 2009-11-08 at 09:55:19ID: 25771192

I solved it. It was a simple variable mistake I have made... Sorry

20120131-EE-VQP-002

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