//不好意思，困了，懶得解釋了

//標頭檔案File:TimeTool.h

#ifndef TIMETOOL_H_INCLUDED
#define TIMETOOL_H_INCLUDED

#include <windows.h>

typedef struct PfmTest
{
 LARGE_INTEGER liStart;
 LARGE_INTEGER liEnd;
 LARGE_INTEGER liPerfFreq;
}PfmTest;

/**
 * 
 *@case
 void main()
 {
  printf("開始\n");
  InitPfmTime();

  BeginPfmTime();
  for(int i = 0; i < 10000; ++i);
  double timeInterval = EndPfmTime();
  printf("結束，總用時:%f\n", timeInterval);

  BeginPfmTime();
  for(int i = 0; i < 500; ++i);
  double timeInterval = EndPfmTime();
  printf("結束，總用時:%f\n", timeInterval);

 }
 */
void InitPfmTime();
void BeginPfmTime();
/**
 *@return double 自上次呼叫BeginPfmTime()到本函式之間的時間間隔，單位為 秒(s).
 */
double EndPfmTime();

/**
 * 
 *@case
 void main()
 {
  printf("開始\n");
  LARGE_INTEGER temp;
  InitPfmTimeWithArg(&temp);
  
  BeginPfmTimeWithArg(&temp);
  for(int i = 0; i < 10000; ++i);
  double timeInterval = EndPfmTimeWithArg(&temp);
  printf("結束，總用時:%f\n", timeInterval);

  BeginPfmTimeWithArg(&temp);
  for(int i = 0; i < 500; ++i);
  double timeInterval = EndPfmTimeWithArg(&temp);
  printf("結束，總用時:%f\n", timeInterval);

 }
 */
void InitPfmTimeWithArg(PfmTest * pfmTest);
void BeginPfmTimeWithArg(PfmTest * pfmTest);
double EndPfmTimeWithArg(PfmTest * pfmTest);

#endif //TIMETOOL_H_INCLUDED

//原始檔File:TimeTool.cpp

#include "TimeTool.h"

static PfmTest pfmTest;

void InitPfmTime()
{
 QueryPerformanceFrequency(&(pfmTest.liPerfFreq));
}
void BeginPfmTime()
{
 QueryPerformanceCounter(&(pfmTest.liStart));
}
double EndPfmTime()
{
 QueryPerformanceCounter(&(pfmTest.liEnd)); 
 double timeSecond = (double)(pfmTest.liEnd.QuadPart - pfmTest.liStart.QuadPart) / (double)(pfmTest.liPerfFreq.QuadPart);
 return timeSecond;
}

void InitPfmTimeWithArg(PfmTest * pfmTest)
{
 QueryPerformanceFrequency(&(pfmTest->liPerfFreq));
}
void BeginPfmTimeWithArg(PfmTest * pfmTest)
{
 QueryPerformanceCounter(&(pfmTest->liStart));
}

double EndPfmTimeWithArg(PfmTest * pfmTest)
{
 QueryPerformanceCounter(&(pfmTest->liEnd)); 
 double timeSecond = (double)(pfmTest->liEnd.QuadPart - pfmTest->liStart.QuadPart) / (double)(pfmTest->liPerfFreq.QuadPart);
 return timeSecond;
}

//測試檔案File:App.cpp

#include <stdlib.h>

#include <stdio.h>

#include  "TimeTool.h"

 void main()
 {
  printf("開始\n");
  LARGE_INTEGER temp;
  InitPfmTimeWithArg(&temp);
  
  BeginPfmTimeWithArg(&temp);
  for(int i = 0; i < 10000; ++i);
  double timeInterval = EndPfmTimeWithArg(&temp);
  printf("結束，總用時:%f\n", timeInterval);

  BeginPfmTimeWithArg(&temp);
  for(int i = 0; i < 500; ++i);
  double timeInterval = EndPfmTimeWithArg(&temp);
  printf("結束，總用時:%f\n", timeInterval);

  printf("開始\n");
  InitPfmTime();

  BeginPfmTime();
  for(int i = 0; i < 10000; ++i);
  double timeInterval = EndPfmTime();
  printf("結束，總用時:%f\n", timeInterval);

  BeginPfmTime();
  for(int i = 0; i < 500; ++i);
  double timeInterval = EndPfmTime();
  printf("結束，總用時:%f\n", timeInterval);

 }