QueryPerformanceFrequency是得到什么呢？

[中才德创]

The QueryPerformanceFrequency function retrieves the frequency of the high-resolution performance counter, if one exists. The frequency cannot change while the system is running.

LARGE_INTEGER li;
QueryPerformanceFrequency(&li);

得到
- li {3579545} _LARGE_INTEGER
LowPart 3579545 unsigned long
HighPart 0 long
- u {LowPart=3579545 HighPart=0 } _LARGE_INTEGER::<unnamed-tag>
LowPart 3579545 unsigned long
HighPart 0 long
QuadPart 3579545 __int64


机器是
Genuine Inter(R) CPU
T1400 @1.73GHz


3579545差不多就是3.58M，究竟是代表什么？

[jixingzhong]

获得机器内部定时器的时钟频率

[jixingzhong]

http://msdn.microsoft.com/en-us/library/ms644905(VS.85).aspx

比如用于精确定时等

[中才德创]

QueryPerformanceFrequency(&li); 每次得到值一样

QueryPerformanceCounter(&li); 每次得到值会变大，是个类似12124760662的值

QueryPerformanceCounter Function
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The QueryPerformanceCounter function retrieves the current value of the high-resolution performance counter.

是指计算机走过的计数器值吗？

[cattycat]

QueryPerformanceFrequency是获取cpu时钟频率的。
counter是计数器，可以用来精确计时，比如sleep毫秒的。