WatchDogTimer.cpp

[詳解]

// ----------------------------------------------------------------------------
 
#include "pch.h"
#include "WatchDogTimer.h"
 
using namespace alt;
 
WatchDogTimer::WatchDogTimer (UINT uPeriod)
{
    _timeup = NULL;
    _uPeriod = uPeriod;
}
 
WatchDogTimer::WatchDogTimer (skeleton::ITimeup* timeup, UINT uPeriod)
{
    _timeup = timeup;
    _uPeriod = uPeriod;
}
 
WatchDogTimer::~WatchDogTimer ()
{
    ::timeEndPeriod (_uPeriod);
}
 
BOOL WatchDogTimer::InitTimer (LPCTSTR lpctszName)
{
    BOOL ret = TRUE;
 
    ::timeBeginPeriod (_uPeriod);
 
    _hObject = ::CreateWaitableTimer (NULL, 0, lpctszName);
    if (_hObject == INVALID_HANDLE_VALUE)
    {
        ret = FALSE;
    }
 
    return ret;
}
 
BOOL WatchDogTimer::StartTimer (DWORD dwTime) const
{
    BOOL ret = FALSE;
    LARGE_INTEGER interval = { 0, 0 };
    // マイナス設定は現在時刻から、プラス設定はエポックタイムから
    interval.QuadPart = -((LONGLONG)dwTime * 10000);
 
    ret = ::SetWaitableTimer (
        _hObject, &interval, (LONG)dwTime,
        _timeup == NULL ? NULL : _timeup->TimeupCall,
        _timeup, FALSE);
    if (ret == FALSE)
    {
        return ret;
    }
 
    return TRUE;
}
 
DWORD WatchDogTimer::WaitTimer () const
{
    return ::WaitForSingleObjectEx (_hObject, INFINITE, TRUE);
}
 
BOOL WatchDogTimer::StopTimer () const
{
    return ::CancelWaitableTimer (_hObject);
}