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計時器代碼片段

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// ProcessAffinity.cpp : 定義控制臺應(yīng)用程序的入口點。
//

#include "stdafx.h"
#include <windows.h>
#include <iostream>
#include <vector>

using namespace std;
void DisplayFrequency(ostream &out, LARGE_INTEGER &freq);

struct TimeSpan
{
    LARGE_INTEGER *Frequency;
    LARGE_INTEGER StartCounter;
    LARGE_INTEGER StopCounter;
    BOOL HAS_ERROR;
    double CalTimeSpan(){
        return (StopCounter.QuadPart - StartCounter.QuadPart)/Frequency->QuadPart;
    }
};

int _tmain(int argc, _TCHAR* argv[])
{
    HANDLE CurrentProcessHandle;
    DWORD ProcessAffinityMask, SystemAffinityMask, AllowProcessAffinity;

    CurrentProcessHandle = GetCurrentProcess();

    //GetCurrentProcess返回一個常量，代表當(dāng)前的進程句柄
    cout<<CurrentProcessHandle<<endl;
    cout<<(HANDLE)-1<<endl;
    cout<<(void*)-1<<endl;
    cout<<(void*)0xffffffff<<endl;

    cout<<"-----------------------------"<<endl;

    if(GetProcessAffinityMask(CurrentProcessHandle, &ProcessAffinityMask, &SystemAffinityMask))
    {
        cout<<ProcessAffinityMask<<endl;    //0x0001
        cout<<SystemAffinityMask<<endl;        //0x0001
    
        AllowProcessAffinity = ProcessAffinityMask & SystemAffinityMask;
        cout<<AllowProcessAffinity<<endl;
    }

    LARGE_INTEGER Freq;
    typedef vector<LARGE_INTEGER> FreqVec_type;
    FreqVec_type FreqVec;
    
    while(FreqVec.size() != 5)
    {
        if(QueryPerformanceFrequency(&Freq))
        {
            DisplayFrequency(cout, Freq);
            FreqVec.push_back(Freq);
        }
        Sleep(1000);
    }

    for(FreqVec_type::iterator iter = FreqVec.begin(); iter!=FreqVec.end(); ++iter)
    {
        DisplayFrequency(cout, *iter);
    }

    cout<<"---------------------"<<endl;

    //calculate the timeSpan;
    TimeSpan ts;
    int sleepTime(3123);

    ts.Frequency = &Freq;

    if(QueryPerformanceCounter(&ts.StartCounter))
    {
        ts.HAS_ERROR = false;
        Sleep(sleepTime);
    }
    if(!ts.HAS_ERROR)
    {
        QueryPerformanceCounter(&ts.StopCounter);
    }
    
    cout<<ts.CalTimeSpan()<<endl;
    cout<<(ts.StopCounter.QuadPart-ts.StartCounter.QuadPart)/sleepTime<<endl;

    return 0;
}

void DisplayFrequency(ostream &out, LARGE_INTEGER &freq)
{
    out<<"start display!"<<endl;
    out<<freq.HighPart<<endl;
    out<<freq.LowPart<<endl;
    out<<freq.QuadPart<<endl;
    out<<"end display!"<<endl;
}

推薦文檔：《使用增強的計時器測量代碼段》（下載可適合打印，已排版，閱讀該文檔需要使用Microsoft Word 2007或相關(guān)閱讀器（后綴docx），如您需要pdf文檔，可以給我留言，我會將它發(fā)給你，在CSDN的下載中，您可能需要注冊成為相關(guān)網(wǎng)站的會員，或者使用積分，如果您覺得麻煩，可以直接向我索取！點此獲取！）

posted on 2009-02-19 01:49 volnet 閱讀(653) 評論(0)  編輯 收藏 引用