14.如何將32 x 32像素圖標(biāo)轉(zhuǎn)換為16 x 16像素值的圖標(biāo)

HICON Convert32x32IconTo16x16(HICON h32x32Icon) {HDC hMainDC, hMemDC1, hMemDC2;HICON h16x16Icon;BITMAP bmp;HBITMAP hOldBmp1, hOldBmp2;ICONINFO IconInfo32x32, IconInfo16x16;GetIconInfo(h32x32Icon, &IconInfo32x32);hMainDC = ::GetDC(m_hWnd);hMemDC1 = CreateCompatibleDC(hMainDC);hMemDC2 = CreateCompatibleDC(hMainDC);GetObject(IconInfo32x32.hbmColor, sizeof(BITMAP), &bmp);IconInfo16x16.hbmColor = CreateBitmap( 16, 16, bmp.bmPlanes,bmp.bmBitsPixel,NULL);hOldBmp1 = (HBITMAP) SelectObject( hMemDC1, IconInfo32x32.hbmColor);hOldBmp2 = (HBITMAP) SelectObject( hMemDC2,IconInfo16x16.hbmColor);StretchBlt(hMemDC2,0, 0,16, 16,hMemDC1,0, 0,32, 32,SRCCOPY);GetObject(IconInfo32x32.hbmMask, sizeof(BITMAP), &bmp);IconInfo16x16.hbmMask = CreateBitmap( 16, 16, bmp.bmPlanes, bmp.bmBitsPixel,NULL);SelectObject(hMemDC1, IconInfo32x32.hbmMask);SelectObject(hMemDC2, IconInfo16x16.hbmMask);StretchBlt(hMemDC2,0, 0,16, 16,hMemDC1,0, 0,32, 32,SRCCOPY);SelectObject(hMemDC1, hOldBmp1);SelectObject(hMemDC2, hOldBmp2);IconInfo16x16.fIcon = TRUE;h16x16Icon = CreateIconIndirect(&IconInfo16x16);DeleteObject(IconInfo32x32.hbmColor);DeleteObject(IconInfo16x16.hbmColor);DeleteObject(IconInfo32x32.hbmMask);DeleteObject(IconInfo16x16.hbmMask);DeleteDC(hMemDC1);DeleteDC(hMemDC2);::ReleaseDC(m_hWnd, hMainDC);return h16x16Icon; }

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