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Catch a button press action

Posted on 1998-09-29
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Last Modified: 2013-11-20
My code is doing a lengthy operation (reading one file and sending the readed bytes to serial port) supported by a dialog with a progress control.


In order to have UPDATE working i have done the following:
// BEGIN MY MESSAGE PROCESSING

//test message pending
MSG lpMsg;
PeekMessage( &lpMsg, NULL,WM_PAINT, WM_RBUTTONDOWN,PM_REMOVE);
switch (lpMsg.message)
{
      
case WM_PAINT:
      dlg.UpdateWindow();
      break;

}
The lengthy code is in one Object i´ve created so i have to pass a CDialog reference to it (the reason for dlg).

This piece of code is executed every 200 bytes readed.

In my dialog i have a button so that the user can cancel the operation. Yes, this is the problem.
What to catch to get a cancel and how?
I think i have to make the visual button action!?

                  
            // END MY MESSAGE PROCESSING

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Comment
Question by:SamGregor
  • 2
3 Comments
 

Author Comment

by:SamGregor
ID: 1322706
My Thanks for reading the question..
0
 
LVL 2

Accepted Solution

by:
prasanth earned 480 total points
ID: 1322707
Use something like the following:

void CMyClass::OnCancel()
{
   if (m_transferring)
       m_cancelled = TRUE;
   else
       CDialog::OnCancel();
}

void CMyClass::OnDoIt()
{
    m_transferring = TRUE;
    while (!m_cancelled)
    {
        StdMsgLoop();
        TransferOneDaoRecord(); // you implement this func
    }
    m_transferring = FALSE;
}

BOOL StdMsgLoop()
{
MSG msg;
while (::PeekMessage(&msg, NULL, 0, 0, PM_NOREMOVE))
{
if (!AfxGetApp()->PumpMessage())
{
::PostQuitMessage(0);
return FALSE;
}
}
return TRUE;
}
0
 

Author Comment

by:SamGregor
ID: 1322708
My enormous thanks for you answer with an example.

0

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