2016-07-15: Window定时器使用

windows下定时器使用实例

#include <iostream>

#include <Windows.h>

using namespace std;

void TimerDemo()

{

    int count = 0;    // Iteration counter

    HANDLE hTimer = NULL;    // WaitableTimer handle

    hTimer = CreateWaitableTimer(    // Create waitable timer

        NULL,

        FALSE,    // Autoreset --> timer restarts counting after event fired

        NULL);

    SYSTEMTIME time;        // System time structure

    GetSystemTime(&time);    // Curren time

    time.wSecond += 3;        // Wait 3 sec

    FILETIME ftime;    // File time (expected by SetWaitableTimer)

    SystemTimeToFileTime(&time, &ftime);    // Convert system to file time

    if(!SetWaitableTimer(    // Set waitable timer

        hTimer,    // Timer handle

        reinterpret_cast<LARGE_INTEGER*>(&ftime),    // Convert file time to large integer

        200,    // Period time, fire again after 200ms

        NULL,

        NULL,

        0))

    {

        cout << "SetWaitableTimer failed" <<  GetLastError() << endl;

    };

    cout << "Start Time " << GetTickCount() << endl;

    while(WaitForSingleObject(hTimer, 5000) == WAIT_OBJECT_0){    // Wait for timer event

        cout << "CALLED " << ++count << endl;

        if(count+1 > 50){    // Exit after 5 events

            break;

        }

    }

    cout << "End Time " << GetTickCount() << endl;

    CancelWaitableTimer(hTimer);    // Stop timer

    CloseHandle(hTimer);            // Delete handle

}