获得进程/线程已经被分配的所有cpu时间片的总和

主要就是GetProcessTimes和GetThreadTimes这两个函数，它们获得的时间都是FILETIME，下面的程序包含了获得两个FILETIME的差（ms）的办法。

如果要显示FILETIME，可以用FileTimeToSystemTime这个函数（http://msdn.microsoft.com/en-us/library/windows/desktop/ms724280(v=vs.85).aspx）

补充，这里有一个跨平台的版本：

（http://nadeausoftware.com/articles/2012/03/c_c_tip_how_measure_cpu_time_benchmarking）

 1 #include "stdafx.h"
 2 #include <windows.h>
 3 #include <iostream>
 4
 5 int GetMSBetweenFileTime(PFILETIME ft1, PFILETIME ft2)
 6 {
 7     ULARGE_INTEGER ul1;
 8     ULARGE_INTEGER ul2;
 9
10     ul1.LowPart = ft1->dwLowDateTime;
11     ul1.HighPart = ft1->dwHighDateTime;
12
13     ul2.LowPart = ft2->dwLowDateTime;
14     ul2.HighPart = ft2->dwHighDateTime;
15
16     ULARGE_INTEGER uliRetValue;
17     uliRetValue.QuadPart = ul2.QuadPart - ul1.QuadPart;
18     uliRetValue.QuadPart /= 10;
19     uliRetValue.QuadPart /= 1000;
20
21     return int(uliRetValue.QuadPart);
22 }
23
24 int _tmain(int argc, _TCHAR* argv[])
25 {
26     FILETIME cpuTime;
27     FILETIME sysTime;
28     FILETIME createTime;
29     FILETIME exitTime;
30
31     BOOL c1 = GetProcessTimes(GetCurrentProcess(), &createTime, &exitTime, &sysTime, &cpuTime);
32
33     for(int i = 0; i < 1000; i++)
34         std::cout << i << std::endl;
35
36     Sleep(3000);
37     FILETIME cpuTime2;
38     FILETIME sysTime2;
39     FILETIME createTime2;
40     FILETIME exitTime2;
41
42     BOOL c2 = GetProcessTimes(GetCurrentProcess(), &createTime2, &exitTime2, &sysTime2, &cpuTime2);
43
44     std::cout << "sysTime:" << GetMSBetweenFileTime(&sysTime, &sysTime2) << std::endl;
45     std::cout << "cpuTime:" << GetMSBetweenFileTime(&cpuTime, &cpuTime2) << std::endl;
46     std::cout << "Done";
47 }

获得进程/线程已经被分配的所有cpu时间片的总和