Re: Thread and Timer

"AliR \(VC++ MVP\)" <AliR@online.nospam>
Wed, 12 Mar 2008 14:26:40 GMT
You dont need to do all of that.
Put the entry to WM_TIMER in your threads message handler,

The OnTimer should have a signature like this:
afx_msg void OnTimer(WPARAM nTimerID,LPARAM);

then call
m_TimerID = SetTimer(NULL,0,time,NULL);

and wait for OnTimer to get called.


"Stefano" <> wrote in message

 I'd like to use a timer inside a thread (CWinThread derived class).
If I use the CALLBACK procedure I get the timer, if I don't use the
CALLBACK and handle in OnTimer I never get the message.
Here is the code:

// WatchDog.cpp : implementation file

#include "stdafx.h"
#include "xcrashreport.h"
#include "WatchDog.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;

CString g_sFileName;
HWND g_hWnd;
UINT g_iMessage;
UINT g_iTimer;
UINT g_iTimerTimeout;

// CWatchDog

void CALLBACK OnTimerProc(
HWND hwnd, // handle to window
UINT uMsg, // WM_TIMER message
UINT_PTR idEvent, // timer identifier
DWORD dwTime // current system time
{ // OnTimerProc

if (idEvent == g_iTimer)
PostMessage(g_hWnd, g_iMessage, WPARAM (0), LPARAM (0));

KillTimer( NULL, g_iTimer );
AfxEndThread( 0, false );


} // OnTimerProc


BOOL CWatchDog::InitInstance()
// TODO: perform and per-thread initialization here
return TRUE;

int CWatchDog::ExitInstance()
// TODO: perform any per-thread cleanup here
return CWinThread::ExitInstance();

BOOL CWatchDog::IsIdleMessage( MSG* pMsg )
if ( !CWinThread::IsIdleMessage( pMsg ) || ( pMsg->message ==
return FALSE;
return TRUE;

// NOTE - the ClassWizard will add and remove mapping macros here.




// CWatchDog message handlers

void CWatchDog::Monitor(CString sFileName, HWND hWnd, UINT iMessage,
int iFrequency, int iTimeout)
//g_iTimer = ::SetTimer(NULL, NULL, iFrequency, (TIMERPROC)

g_iTimer = SetTimer(NULL, 0, iFrequency, NULL);
g_hWnd = hWnd;
g_iMessage = iMessage;

void CWatchDog::OnTimer(WPARAM wParam, LPARAM lParam)

if ((UINT) wParam == g_iTimer)
PostMessage(g_hWnd, g_iMessage, WPARAM (0), LPARAM (0));

Thanks in advance,

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