How do I properly draw a bitmap and cleanup after it, in MFC?

See more:

C++

MFC

Bitmap

This is my first submission, so I apologize up front if I'm doing it wrong.

I'm working in MSVC C++, in a Windows application with MFC support. I have spent the last 3 days online looking for suggestions, and the code below is what I have come up with. imgOut is a global CImage object created before this routine is called. In general the code works fine, but at just under 30000 cycles I get an error:

Unhandled exception at 0x516b70ee (mfc90d.dll) in Centroider.exe: 0xC0000005: Access violation reading location 0x0000000000000008.

Which the call stack points to: BOOL delDC = DeleteDC(mDC);

As you can see from the commented lines, I have tried a variety of approaches at cleaning up and nothing works.

I would greatly appreciate suggestions.
Thanks

void DrawBitmap::DrawImg(){
  try{
    drawCnt++;

    CDC *screenDC = dlgPWnd->GetDC();
    CDC mDC;
    mDC.CreateCompatibleDC(screenDC);
    CBitmap b; 
    b.CreateCompatibleBitmap(screenDC, bmpXDest, bmpYDest);

    CBitmap *pob = mDC.SelectObject(&b);
    mDC.SetStretchBltMode(HALFTONE);
    imgOut.StretchBlt(mDC.m_hDC, 0, 0, bmpXDest, bmpYDest, 0, 0, imgOut.GetWidth(), imgOut.GetHeight(), SRCCOPY);
    mDC.SelectObject(pob);

    HWND pictHW = GetDlgItem( dlgHWnd, pictIdc );
    CWnd* pictCW = CWnd::FromHandle(pictHW);
    BOOL delObj = DeleteObject(((CStatic*)pictCW)->SetBitmap((HBITMAP)b.Detach()));

    pob->Detach();
    //mDC.DeleteDC();
    BOOL delDC = DeleteDC(mDC);
    //mDC.Detach();
    //mDC.ReleaseAttribDC();
    //mDC.ReleaseOutputDC();
    //DeleteObject(mDC);
    imgOut.Detach();
    dlgPWnd->ReleaseDC(screenDC);
  }catch(...){
    TRACE("DrawImg Exception\n");
  }
}