Problem with HDCs

[Serge Lobko Lobanovsky]

Hi, everyone! I'm a newbie in MC++ and Win32 API programming. I want to create a Bitmap object with an image of a Windows.Forms form. So far I've written the following code: Bitmap *De3DFormView::GetWindowBitmap(Form *pForm) { System::Drawing::Graphics *pGraph = Graphics::FromHwnd(pForm->Handle); int pSrc=pGraph->GetHdc().ToInt32(); HDC destDC; HBITMAP destBmp; DWORD err; destDC = CreateCompatibleDC((HDC)pSrc); destBmp = CreateCompatibleBitmap((HDC)pSrc, pForm->Width, pForm->Height); SelectObject(destDC, destBmp); SendMessage(HWND((int)pForm->Handle), WM_PRINT, WPARAM(destDC), PRF_CLIENT | PRF_NONCLIENT | PRF_CHILDREN | PRF_ERASEBKGND); Bitmap *pB = Image::FromHbitmap(destBmp); pGraph->ReleaseHdc(pSrc); pGraph->Dispose(); return pB; } When I run it, I get the following exception "ArgumentException" with message "hdc". Debugging shows that this error occurs after the "SendMessage" call. The other thing is that when I step through the "destDC = CreateCompatibleDC((HDC)pSrc);" line, I notice that destDC has "undefined value". Can you tell me what I am doing wrong? Regards, Serge (Logic Software)