好用
就是可以定时地做
些工作而不需要人参和进去
比如每天定时地升级病毒库定时地下载电影定时地更新游戏里人物要想实现这些功能就可以使用定时器API
CreateWaitableTimer和SetWaitableTimer来实现了这对API创建时钟是比较精确可以达到100倍10亿分的秒CreateWaitableTimer和SetWaitableTimer声明如下:WINBASEAPI
__out
HANDLE
WINAPI
CreateWaitableTimerA(
__in_opt LPSECURITY_ATTRIBUTES lpTimerAttributes,
__in BOOL bManualRe
,
__in_opt LPCSTR lpTimerName
);
WINBASEAPI
__out
HANDLE
WINAPI
CreateWaitableTimerW(
__in_opt LPSECURITY_ATTRIBUTES lpTimerAttributes,
__in BOOL bManualRe,
__in_opt LPCWSTR lpTimerName
);
#
def UNICODE
#
CreateWaitableTimer CreateWaitableTimerW
#
# CreateWaitableTimer CreateWaitableTimerA
#end // !UNICODE
WINBASEAPI
BOOL
WINAPI
SetWaitableTimer(
__in HANDLE hTimer,
__in const LARGE_INTEGER *lpDueTime,
__in LONG lPeriod,
__in_opt PTIMERAPCROUTINE pfnCompletionRoutine,
__in_opt LPVOID lpArgToCompletionRoutine,
__in BOOL fResume
);lpTimerAttributes是设置定时器
属性bManualRe
是是否手动复位lpTimerName是定时器
名称hTimer是定时器
句柄lpDueTime是设置定时器时间间隔
当设置为正值是绝对时间；当设置为负数是相对时间lPeriod是周期
pfnCompletionRoutine是设置回调
lpArgToCompletionRoutine是传送给回调
参数fResume是设置系统是否自动恢复
例子如下:#001 //创建定时器
#002 //蔡军生 2007/11/06 QQ:9073204 深圳
#003 
CreateTestTimer(void)
#004 {
#005 HANDLE hTimer = NULL;
#006 LARGE_INTEGER liDueTime;
#007
#008 //设置相对时间为10秒
#009 liDueTime.QuadPart = -100000000;
#010
#011 //创建定时器
#012 hTimer = CreateWaitableTimer(NULL, TRUE, _T("TestWaitableTimer"));
#013 (!hTimer)
#014 {
#015 
1;
#016 }
#017
#018 OutputDebugString(_T("10秒定时器\r\n"));
#019
#020 // 设置10秒钟
#021 (!SetWaitableTimer(hTimer, &liDueTime, 0, NULL, NULL, 0))
#022 {
#023 //
#024 CloseHandle(hTimer);
#025 2;
#026 }
#027
#028 //等定时器有信号
#029 (WaitForSingleObject(hTimer, INFINITE) != WAIT_OBJECT_0)
#030 {
#031 OutputDebugString(_T("10秒定时器出错了\r\n"));
#032 //
#033 CloseHandle(hTimer);
#034 3;
#035 }
#036
#037 {
#038 //10秒钟到达
#039 OutputDebugString(_T("10秒定时器到了\r\n"));
#040 }
#041
#042 //
#043 CloseHandle(hTimer);
#044 0;
#045 }
最新评论