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Trial&Error++
Wen es interessiert:
//BB - Fenster wird aktualisiert
CClientDC dc3(this);
dc3.SetBkMode(TRANSPARENT);
CDC tempDC;
tempDC.CreateCompatibleDC(&dc3);
tempDC.SetBkMode(TRANSPARENT);
tempDC.SelectObject( &graph );
///////////////////////////////////////////////////////////
CDC graphDC;
graphDC.CreateCompatibleDC(&dc3);
graphDC.SetBkMode(TRANSPARENT);
rcClip=cR_gMain;
GetClientRect(&rcClient);
graph_infos.DeleteObject();
graph_infos.CreateCompatibleBitmap(&dc3, rcClient.Width(), rcClient.Height());
graphDC.SelectObject( &graph_infos );
CRgn rgn;
rgn.CreateRectRgnIndirect( &rcClip );
graphDC.SelectClipRgn(&rgn);
rgn.DeleteObject();
graphDC.BitBlt(rcClip.left, rcClip.top, rcClip.Width(), rcClip.Height(), &tempDC,rcClip.left, rcClip.top, SRCCOPY );
dc3.BitBlt( rcClip.left, rcClip.top, rcClip.Width(), rcClip.Height(), &graphDC,rcClip.left, rcClip.top, SRCCOPY );