How to save what I had drawn on a window to LPPICTUREDISP?

I had drawn some lines on a window, how do I copy the picture to LPPICTUREDISP.

stlAsked:
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galkinCommented:
You must create memory DC and compatible bitmap. Select this bitmap into DC, force your window to draw itself on this memory DC. Then you must construct CPictureHolder object and use its CreateFromBitmap function passing bitmap you drew on(previously deselected it from memory DC of cause).Then you can get dispatch interface by CPictureHolder::GetPictureDispatch()

CDC memDC;
CDC *pDC = GetDC();
memDC.CreateCompatibleDC(pDC);
CBitmap bitmap;
CRect rc;
GetWindowRect(&rc);
bitmap.CreateCompatibleBitmap(pDC, rc.Width(), rc.Height());
CBitmap *pOldBitmap = (CBitmap *)memDC.SelectObject(&bitmap);
//here you must draw your window onto memory DC. If your window //implement WM_PRINT message so you can send this message to //your window passing memory DC handle as WPARAM, otherwise
// you must explicity draw window
memDC.SelectObject(pOldBitmap);
ReleaseDC(pDC);

CPictureHolder pictureHolder;
pictureHolder.CreateFromBitmap(&bitmap);

LPPICTUREDISP lpPictureDisp = pictureHolder.GetPictureDispatch();
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