如何获取cpu频率

为了调试游戏，有时需要参考玩家的系统信息，试了下，发现用高精度计时器可以获得较为准确的结果。

（原代码作者不详，有改动）

//精确延时获得CPU频率

#include <windows.h>
int CPU_Frequency(void) //MHz 
{
    LARGE_INTEGER CurrTicks, TicksCount;
    __int64 iStartCounter, iStopCounter;
    DWORD dwOldProcessP = GetPriorityClass(GetCurrentProcess());  //纪录和提高优先级
    DWORD dwOldThreadP = GetThreadPriority(GetCurrentThread());
    SetPriorityClass(GetCurrentProcess(), REALTIME_PRIORITY_CLASS);
    SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_TIME_CRITICAL);
    QueryPerformanceFrequency(&TicksCount);
    QueryPerformanceCounter(&CurrTicks);
    TicksCount.QuadPart /= 16;
    TicksCount.QuadPart += CurrTicks.QuadPart;
    __asm  
    {
        rdtsc
            mov DWORD PTR iStartCounter, EAX
            mov DWORD PTR (iStartCounter+4), EDX
    }
    while(CurrTicks.QuadPart<TicksCount.QuadPart)
        QueryPerformanceCounter(&CurrTicks);
    __asm 
    {
        rdtsc
            mov DWORD PTR iStopCounter, EAX
            mov DWORD PTR (iStopCounter + 4), EDX
    }
    SetThreadPriority(GetCurrentThread(), dwOldThreadP);
    SetPriorityClass(GetCurrentProcess(), dwOldProcessP);
    return (int)((iStopCounter-iStartCounter)/62500);
}
 

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另：从SYSTEM_INFO中便能获得核数、类型等CPU信息

GetSystemInfo(&siSysInfo);