2011-02-23 14:51:19

其实也是WINDOWS下的通用办法啦，只不过我用PYTHON表达。

用win32api.GetSystemTime()不是太精确，值15毫秒才变一下，最好用time.clock()，这个能到毫秒级，最精确的办法是用QueryPerformanceFrequency()函数和QueryPerformanceCounter()函数。用CPU周期计时，很精确。win32api里没定义，调用办法如下：

import time,ctypes

freq = ctypes.c_longlong(0)

ctypes.windll.kernel32.QueryPerformanceFrequency(ctypes.byref(freq))

f=freq.value

print f

ctypes.windll.kernel32.QueryPerformanceCounter(ctypes.byref(freq))

n1=freq.value

print n1

time.sleep(1)

ctypes.windll.kernel32.QueryPerformanceCounter(ctypes.byref(freq))

n2=freq.value

print n2

print (n2-n1)/(f+0.)