Problem with HDC (Not sure where to start) RSS

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  danc00per

  Member

  120 Points

  24 Posts

  Problem with HDC (Not sure where to start)

  May 22, 2006 03:49 PM|LINK

  Hi,
  
  I am trying to get Acrobat to draw a page into a System.Drawing.Image.HBitmap class, I have the following code which so far only grabs the desktop window, I need to get an HDC somehow but am not sure exactly where and how I should be doing it:
  
              _pdpage = (CAcroPDPage)_pddoc.AcquirePage(page);
  
              /// This line is the problem:
              IntPtr hDC = new IntPtr();
  
              AcroRect pdfRect = new AcroRect();
  
              pdfRect.Left = 0;
              pdfRect.right = 200;
              pdfRect.Top = 0;
              pdfRect.bottom = 200;
             
              _pdpage.DrawEx(0, hDC.ToInt32(), pdfRect, 0, 0, 100);
  
              IntPtr hMemDC = PlatformInvokeGDI32.CreateCompatibleDC(hDC);
              IntPtr hBitmap = PlatformInvokeGDI32.CreateCompatibleBitmap(hDC, pdfRect.right, pdfRect.bottom);
  
              IntPtr hOld = (IntPtr)PlatformInvokeGDI32.SelectObject(hMemDC, hBitmap);
              PlatformInvokeGDI32.BitBlt(hMemDC, 0, 0, pdfRect.right, pdfRect.bottom, hDC, 0, 0, PlatformInvokeGDI32.SRCCOPY);
              PlatformInvokeGDI32.SelectObject(hMemDC, hOld);
              PlatformInvokeGDI32.DeleteDC(hMemDC);
              Bitmap newBmp = System.Drawing.Image.FromHbitmap(hBitmap);
             
              PlatformInvokeGDI32.DeleteObject(hBitmap);
              GC.Collect();
  
              newBmp.Save("C:\\test.bmp");
  
  Now all that code does is draw the desktop window to the file, I need to know where I'm going wrong.
  
  Thanks in advance!