Go Premium for a chance to win a PS4. Enter to Win

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 181
  • Last Modified:

Catch a button press action

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

0
SamGregor
Asked:
SamGregor
  • 2
1 Solution
 
SamGregorAuthor Commented:
My Thanks for reading the question..
0
 
prasanthCommented:
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
 
SamGregorAuthor Commented:
My enormous thanks for you answer with an example.

0

Featured Post

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

  • 2
Tackle projects and never again get stuck behind a technical roadblock.
Join Now