[SOLVED] Report doesn't paint if out of GDI memory

Hello,

Our customers are working with many windows using your report control and have large screen display. At a certain point, the report control window is left unpainted and seems to hang, but after resizing the window it comes back to life.

After looking at your code, we saw that you don't check if the bitmap buffer was successfully created :

void CXTPReportControl::OnPaint()
{

     ...

     CDC memDC;
     memDC.CreateCompatibleDC(&dc);

     m_bmpCache.DeleteObject();
     m_bmpCache.CreateCompatibleBitmap(&dc, rc.Width(), rc.Height());

     ...

Should be :

     ...

     BOOL bUseBuffer = FALSE;
     CDC* pDC = &dc;

     CDC memDC;
     if (memDC.CreateCompatibleDC(&dc))
     {
          m_bmpCache.DeleteObject();
          if (m_bmpCache.CreateCompatibleBitmap(&dc, rc.Width(), rc.Height()))
          {
              �bUseBuffer = TRUE;
              �pDC = &memDC;

              �...
          }
     }

     ... Perform drawings using pDC ...

     if (bUseBuffer)
     {
          ... Blit memDC to dc ...
     }

     ...

Could you please fix it, thank you.

Regards,

znakeeye wrote: Perhaps CXTMemDC could be updated with this type of logic. Then you could use it in the report control too.

Thank you for your answer, but are you talking to Codejock's developers?

I don't want to rewrite the OnPaint() of the report control...

Code has been updated for 15.0.3

Double buffering can now also be disabled altogether, EnableDoubleBuffering(FALSE);

If double buffering fails it falls back to direct drawing.