复制Icon和复制Bitmap的方法

1、复制Icon（并拉伸）

//
// 伸缩图标,指定图标的长和宽
//
HICON StretchIcon(HICON hIcon, int iWidth, int iHeight)
{
 HICON hTempIcon;

 HDC hdc = GetDC(NULL);

 //建立一个兼容DC，用于作图
 HDC hMemDc = CreateCompatibleDC(hdc);

 //注意，这里的参数dc不能为兼容dc，否则就是单色位图
 HBITMAP hMemBmp = (HBITMAP)CreateCompatibleBitmap(hdc, iWidth, iHeight);

 HBITMAP hOldBmp = (HBITMAP)SelectObject(hMemDc, hMemBmp);

 HBRUSH br = (HBRUSH)GetStockObject(WHITE_BRUSH);

 RECT rect;
 rect.left = 0;
 rect.right = iWidth;
 rect.top = 0;
 rect.bottom = iHeight;

 SelectObject(hMemDc, br);
 FillRect(hMemDc, &rect, br);

 // 画图标
 DrawIconEx(hMemDc, 0, 0, hIcon, iWidth, iHeight, 0, NULL, DI_NORMAL);

 //保持图片
 SelectObject(hMemDc, hOldBmp);

 ICONINFO info;

 info.fIcon = TRUE;
 info.hbmMask = CreateBitmap(iWidth, iHeight, 1, 1, NULL);
 info.hbmColor = hMemBmp;

 // 创建图标
 hTempIcon = CreateIconIndirect(&info);

 // 清除资源
 DeleteObject(info.hbmMask);
 info.hbmMask = NULL;

 DeleteObject(hMemBmp);
 hMemBmp = NULL;

 DeleteDC(hMemDc);
 hMemDc = NULL;

 ReleaseDC(NULL, hdc);
 hdc = NULL;

 return hTempIcon;
}

 

2、复制Bitmap

HBITMAP CopyBitmap( HBITMAP hbm) {
    HDC hdcSrc = CreateCompatibleDC(NULL);
    HDC hdcDst = CreateCompatibleDC(NULL);
    HBITMAP hbmOld, hbmOld2, hbmNew;
    BITMAP bm;

    GetObject(hbm, sizeof(bm), &bm);

    hbmOld = SelectObject(hdcSrc, hbm);

    hbmNew = CreateBitmap( bm.bmWidth, bm.bmHeight, bm.bmPlanes,
bm.bmBitsPixel,
            NULL);

    hbmOld2 = SelectObject(hdcDst, hbmNew);

    BitBlt(hdcDst, 0, 0, bm.bmWidth, bm.bmHeight, hdcSrc, 0, 0, SRCCOPY);

    SelectObject(hdcSrc, hbmOld);
    DeleteDC(hdcSrc);
    DeleteDC(hdcDst);

    return hbmNew;
}