內核定時器

 

#include "stdafx.h"

#include <windows.h>
#include <stdio.h>


VOID CALLBACK TimerRoutine(PVOID lpParam, BOOLEAN TimerOrWaitFired)
{
    printf("World!\n");
}


int _tmain(int argc, _TCHAR* argv[])
{
    HANDLE hTimer = NULL;
    HANDLE hTimerQueue = NULL;
    int arg = 123;

    // Create the timer queue.
    hTimerQueue = CreateTimerQueue();
    if (NULL == hTimerQueue)
    {
        printf("CreateTimerQueue failed (%d)\n", GetLastError());
        return 2;
    }

    // Set a timer to call the timer routine in 1 seconds.
    if (!CreateTimerQueueTimer( &hTimer, hTimerQueue, 
            (WAITORTIMERCALLBACK)TimerRoutine, &arg , 200, 1000, WT_EXECUTEDEFAULT))
    {
        printf("CreateTimerQueueTimer failed (%d)\n", GetLastError());
        return 3;
    }

    while(1)
    {
        printf("Hello!\n");
        Sleep(1000);
    }
    DeleteTimerQueueTimer(hTimerQueue,hTimer,NULL);
    // Delete all timers in the timer queue.
    if (!DeleteTimerQueue(hTimerQueue))
        printf("DeleteTimerQueue failed (%d)\n", GetLastError());

    return 0;
}

使用內核定時器多好，連消息循環都不用建的。
供參考：
C/C++ code
// 析構函數
CTimer::~CTimer()
{
    ITER iter = m_hTimerMap.begin();
    ITER enditer = m_hTimerMap.end();
    for (; iter != enditer; ++iter)
    {
        DeleteTimerQueueTimer(m_hTimerQueue, iter->second, INVALID_HANDLE_VALUE);
    }

    DeleteTimerQueueEx(m_hTimerQueue, INVALID_HANDLE_VALUE);
}

// 創建定時器
BOOL CTimer::Create(PVOID pvCallBack, PVOID pvParam, DWORD dwDueTime, DWORD dwPeriod, ULONG dwFlags)
{
    if (IsExist(pvCallBack)) return FALSE;

    // 創建定時器隊列
    if (m_hTimerQueue == NULL)
    {
        m_hTimerQueue = CreateTimerQueue();
    }

    // 創建並保存
    HANDLE hTimer = NULL;
    BOOL bRet = CreateTimerQueueTimer(
                    &hTimer,
                    m_hTimerQueue,
                    (WAITORTIMERCALLBACK)pvCallBack,
                    pvParam,
                    dwDueTime,
                    dwPeriod,
                    dwFlags);
    if (bRet)
    {
        m_hTimerMap.insert(TYPE(pvCallBack, hTimer));
    }

    return bRet;
}

// 修改定時器
BOOL CTimer::Change(PVOID pvCallBack, DWORD dwDueTime, DWORD dwPeriod)
{
    ITER iter = m_hTimerMap.find(pvCallBack);
    if (iter != m_hTimerMap.end() &&
            ChangeTimerQueueTimer(m_hTimerQueue, iter->second, dwDueTime, dwPeriod))
    {
        return TRUE;
    }

    return FALSE;
}

// 刪除定時器
BOOL CTimer::Delete(PVOID pvCallBack, HANDLE hCompletionEvent)
{
    ITER iter = m_hTimerMap.find(pvCallBack);
    if (iter != m_hTimerMap.end() &&
            DeleteTimerQueueTimer(m_hTimerQueue, iter->second, hCompletionEvent))
    {
        m_hTimerMap.erase(pvCallBack);
        return TRUE;
    }

    return FALSE;
}

// 清除所有定時器
BOOL CTimer::Clear()
{
    if (m_hTimerMap.size() == 0) return FALSE;
    for (ITER iter = m_hTimerMap.begin(); iter != m_hTimerMap.end(); ++iter)
    {
        DeleteTimerQueueTimer(m_hTimerQueue, iter->second, INVALID_HANDLE_VALUE);
    }

    m_hTimerMap.clear();
    return TRUE;
}

// 定時器是否存在
BOOL CTimer::IsExist(PVOID pvCallBack)
{
    ITER iter = m_hTimerMap.find(pvCallBack);
    if (iter != m_hTimerMap.end())
    {
        return TRUE;
    }
    else
    {
        return FALSE;
    }
}