我正在尝试使用CreateTimerQueueTimer(...)
定时运行一个函数。
我正在使用MSDN中的一个示例,主要关注以下代码:
CreateTimerQueueTimer( &hTimer, hTimerQueue,(WAITORTIMERCALLBACK)TimerRoutine, &arg , 50,100, 0)
你好,以下是你需要翻译的内容:
语法如下:
BOOL WINAPI CreateTimerQueueTimer(
_Out_ PHANDLE phNewTimer,
_In_opt_ HANDLE TimerQueue,
_In_ WAITORTIMERCALLBACK Callback,
_In_opt_ PVOID Parameter,
_In_ DWORD DueTime,
_In_ DWORD Period,
_In_ ULONG Flags
);
倒数第二个参数表示:
Period [in]
计时器的周期,以毫秒为单位。如果此参数为零,则计时器仅信号一次。如果此参数大于零,则计时器是周期性的。每当周期到期时,周期计时器会自动重新激活,直到计时器被取消。
从我的代码中可以看出,我将Due时间设置为50,周期设置为100。当我运行它时,它不会重复触发计时器。有人可以帮我吗?
这是整个代码:
#include "stdafx.h"
#include <string>
#include <iostream>
#include <thread>
#include <Windows.h>
#include <stdio.h>
using namespace std;
HANDLE gDoneEvent;
VOID CALLBACK TimerRoutine(PVOID lpParam, BOOLEAN TimerOrWaitFired)
{
if (lpParam == NULL)
{
printf("TimerRoutine lpParam is NULL\n");
}
else
{
// lpParam points to the argument; in this case it is an int
printf("Timer routine called. Parameter is %d.\n",
*(int*)lpParam);
if(TimerOrWaitFired)
{
printf("The wait timed out.\n");
}
else
{
printf("The wait event was signaled.\n");
}
}
SetEvent(gDoneEvent);
}
int main()
{
HANDLE hTimer = NULL;
HANDLE hTimerQueue = NULL;
int arg = 123,x;
// Use an event object to track the TimerRoutine execution
gDoneEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
if (NULL == gDoneEvent)
{
printf("CreateEvent failed (%d)\n", GetLastError());
return 1;
}
// 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 10 seconds.
if (!CreateTimerQueueTimer( &hTimer, hTimerQueue,(WAITORTIMERCALLBACK)TimerRoutine, &arg , 50,100, 0))
{
printf("CreateTimerQueueTimer failed (%d)\n", GetLastError());
return 3;
}
// TODO: Do other useful work here
printf("Call timer routine in 10 seconds...\n");
// Wait for the timer-queue thread to complete using an event
// object. The thread will signal the event at that time.
if (WaitForSingleObject(gDoneEvent, INFINITE) != WAIT_OBJECT_0)
printf("WaitForSingleObject failed (%d)\n", GetLastError());
CloseHandle(gDoneEvent);
// Delete all timers in the timer queue.
if (!DeleteTimerQueue(hTimerQueue))
printf("DeleteTimerQueue failed (%d)\n", GetLastError());
cin>>x;
return 0;
}
谢谢