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.NET Forum / Languages / Managed C++ / May 2008GetClipRgn
Trying to use GetClipRgn from "OnDraw" (Visual C++ 2005), Windows XP. The code is: HRGN hRgnClip = CreateRectRgn(rcPaint.left, rcPaint.top, rcPaint.right, rcPaint.bottom); int nRet = GetClipRgn(pDC->m_hDC, hRgnClip); bool bHasClipRgn = (nRet == 1); . . "bHasClipRgn" is never True. Any ideas? > "bHasClipRgn" is never True. Any ideas? You forgot to select the region into the device context. HRGN hRgnClip = CreateRectRgn(rcPaint.left, rcPaint.top, rcPaint.right, rcPaint.bottom); HGDIOBJ hOldRgnClip = SelectObject(pDC->m_hDC, hRgnClip )// <------Add this line int nRet = GetClipRgn(pDC->m_hDC, hRgnClip); bool bHasClipRgn = (nRet == 1); Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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