MFC中CBitmap的简单复制方法 (Copy CBitmap)

HBITMAP CMyDialog::CopyBitmap(HBITMAP hSourceHbitmap)
{
CDC sourceDC;
CDC destDC;
sourceDC.CreateCompatibleDC(NULL);
destDC.CreateCompatibleDC(NULL);
//The bitmap information.
BITMAP bm = {0};
//Get the bitmap information.
::GetObject(hSourceHbitmap, sizeof(bm), &bm);
// Create a bitmap to hold the result
HBITMAP hbmResult = ::CreateCompatibleBitmap(CClientDC(NULL), bm.bmWidth, bm.bmHeight);

HBITMAP hbmOldSource = (HBITMAP)::SelectObject(sourceDC.m_hDC, hSourceHbitmap);
HBITMAP hbmOldDest = (HBITMAP)::SelectObject(destDC.m_hDC, hbmResult);
destDC.BitBlt(0, 0, bm.bmWidth, bm.bmHeight, &sourceDC, 0, 0, SRCCOPY );

// Restore DCs
::SelectObject(sourceDC.m_hDC, hbmOldSource);
::SelectObject(destDC.m_hDC, hbmOldDest);
::DeleteObject(sourceDC.m_hDC);
::DeleteObject(destDC.m_hDC);

return hbmResult;
}