定时器也不准？

secondsen

我后来也 提升了 线程和进程优先级。。。

class _2nDs_Timer

{

private:

HANDLE hTimer;

public:

_2nDs_Timer(unsigned char bInit = 0);

~_2nDs_Timer(void);

unsigned char CreateTimer(void); // 返回负数表示创建失败

unsigned char DeleteTimer(void);

unsigned char IsExist(void);

unsigned char WaitTime(int Itime); // 毫秒

unsigned int GetTime(void);//毫秒

};

_2nDs_Timer::_2nDs_Timer(unsigned char bInit)

{

DWORD dwCurrentProcessID = GetCurrentProcessId();

HANDLE hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, dwCurrentProcessID);

DWORD dwCurrentThreadID = GetCurrentThreadId();

HANDLE hThread = OpenThread(THREAD_ALL_ACCESS, FALSE, dwCurrentThreadID);

if (hProcess)

printf("打开进程成功. ");

else

printf("打开进程失败. ");

if (hThread)

printf("打开线程成功. ");

else

printf("打开线程失败. ");

if (SetPriorityClass(hProcess, REALTIME_PRIORITY_CLASS))

printf("设置进程优先级成功. ");

else

printf("设置进程优先级失败. ");

if (SetThreadPriority(hThread, THREAD_PRIORITY_TIME_CRITICAL))

printf("设置线程优先级成功. ");

else

printf("设置线程优先级失败. ");

if (0 == bInit)

hTimer = 0;

else

hTimer = CreateWaitableTimer(NULL, FALSE, NULL);

}

_2nDs_Timer::~_2nDs_Timer(void)

{

if (hTimer) CloseHandle(hTimer);

}

unsigned char _2nDs_Timer::CreateTimer(void)

{

if (hTimer) return 0x10;

hTimer = CreateWaitableTimer(NULL, FALSE, NULL);

if (NULL == hTimer) return 0x20;

return 1;

}

unsigned char _2nDs_Timer:eleteTimer(void)

{

if (NULL == hTimer) return 0x10;

if (FALSE == CloseHandle(hTimer)) return 0x20;

hTimer = 0;

return 1;

}

unsigned char _2nDs_Timer::IsExist(void)

{

if (hTimer)

return 1;

return 0;

}

unsigned char _2nDs_Timer::WaitTime(int Itime)

{

if (NULL == hTimer) return 0;

if (WaitForSingleObject(hTimer, (DWORD)Itime))

return 1;

return 0;

}

unsigned int _2nDs_Timer::GetTime(void)

{return (UINT)GetTickCount();}

main中

_2nDs_Timer timer(1);

while(1)

{

time = timer.GetTime();

timer.WaitTime(16);

int intime = timer.GetTime() - time;

printf("time_delta : %d ", intime);

}

结果。。。

15

16

15

16

就是15 或者16

但是 timer.WaitTime(16);

就会显示

31

32

31

32

就是 32或者31

timer.WaitTime(8);

0、15、16都有可能。。。

是CPU中断频率的作用么？？

secondsen

UP。。。。

tamashii

用QueryPerformanceCounter和QueryPerformanceFrequncy做计时器吧，这是CPU时间，100%准确的 -w-

secondsen

QueryPerformanceCounter和QueryPerformanceFrequncy可以让进程不占用CPU不？

一个是计数，一个是频率，难道要死循环做判断？