Re: Multithread and Dialog

When I press the OK button of the main dialog (CMainDialog), it will
create another dialog (CMyDialog) and a worker thread. Just before the
worker thread end, it will post WM_CLOSE message to CMyDialog. I have
added a breakpoint in both CMyDialog::OnClose and
CMyDialog::OnNcDestroy. I supposed it will stop just after the WM_CLOSE
is sent. However, it is sent when the Cancel button of CMainDialog is
pressed. Any reason to explain that?

Also, since CMyDialog does not belong to the worker thread, it is good
to call UI related method CMyDialog::step (which call
CProgressCtrl::StepIt) directly from the worker thread?

Thanks.

UINT MyThreadProc( LPVOID pParam ) {
   CMyDialog *pMyDialog = (CMyDialog*)pParam;

   if (pMyDialog == NULL) {
       return 1;
   }

   for (int i=0; i<5; ++i) {
       ::Sleep(1000);
       pMyDialog->step();
   }

   pMyDialog->PostMessage(WM_CLOSE, 0, 0);

   return 0;
}

void CMainDialog::OnBnClickedOk()
{
   pMyDialog = new CMyDialog(5);
   pMyDialog->Create(IDD_MY_DIALOG);
   pMyDialog->ShowWindow(SW_SHOW);

   AfxBeginThread(MyThreadProc, pMyDialog);
}

void CMyDialog::step() {
   _progressBar.StepIt();
}

void CMyDialog::OnClose() {
   DestroyWindow();
}

void CMyDialog::PostNcDestroy() {
   CDialog::PostNcDestroy();
   delete this;
}