Problem with MFC Thread

From:

Lucress Carol <incognito.me@gmx.de>

Newsgroups:

microsoft.public.vc.mfc

Date:

Tue, 16 Sep 2008 06:34:39 -0700 (PDT)

Message-ID:

<6c0c5db3-6262-4f44-9bae-78342b9d68de@e53g2000hsa.googlegroups.com>

Hi everyone,
I've created a MFC Dialog with a Progress Bar Control, a Stop Button
and a Start Buttton.The idea is to start the progress bar Control by
clicking on the Start Button and I would like to pause (Stop Button)
the process at anytime and continue it when I click on the Start
Button again.
I 'm able to stop the process of the Progress Bar but when I try to
continue the process the whole thing crash...
Here is how my code looks like:

// CProgressBarExampleDlg.h
class CProgressBarExampleDlg : public CDialog
{
  public :
CProgressBarExampleDlg(CWnd* pParent = NULL);
UINT Execute(); // here should be the process of the Progress Bar
executed
static UINT WorkerThreadLauncher(LPVOID pvParam);
HANDLE m_hEndThread;
...
...
protected:
void ProcessMessage();
volatile bool m_StopThread;
CWinThread* m_Thread;
....
....
};

//CProgressBarExampleDlg.cpp

BOOL CProgressBarExampleDlg::OnInitDialog()
{
...
m_progress.SetRange(5, 100);
m_StopThread=false;
HANDLE m_hEndThread = CreateEvent(0, TRUE, FALSE, 0);
....
return TRUE;
}

void CProgressBarExampleDlg::ProcessMessage()
{
     MSG msg;

         if (::PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
    {
        ::TranslateMessage(&msg);
        ::DispatchMessage(&msg);
    }
}

UINT CProgressBarExampleDlg::WorkerThreadLauncher(LPVOID pvParam)
{
   CProgressBarExampleDlg* pThreadInstance=
reinterpret_cast<CProgressBarExampleDlg*>(pvParam);
   return pThreadInstance->Execute();
}

UINT CProgressBarExampleDlg::Execute()
{
    int i, count;
    count=0;

    while (count< 180 && !m_StopThread)
    {
        for (i=0;i<30;i++)
        {
            m_progress.SetPos(i+10);
            Sleep(10);
        }
        count++;
        ProcessMessage();
    }
    return 0;
}

void CProgressBarExampleDlg::OnBnStart()
{
     this->m_Thread=AfxBeginThread(WorkerThreadLauncher,this);
}

void CProgressBarExampleDlg::OnBnStop()
{
      MSG msg;
       DWORD dwResult = WaitForSingleObject( m_hEndThread, 0 );

    if ( dwResult =! WAIT_OBJECT_0 )
                   {
         this->m_StopThread = true;
                   }
}

I guess in the OnBnStart() function I maybe need a if-clause to start
the process again when it has been previously interrupted?

Does someone have a suggestion?
Thank you
Lucress