实验:记时器类实现

// timeLog.cpp : Defines the entry point for the console application. // #include "stdafx.h" #include "timeLog.h" #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif ///////////////////////////////////////////////////////////////////////////// // The one and only application object CWinApp theApp; using namespace std; static DWORD dwTimeBegin = 0; static DWORD dwTimeEnd = 0; void TimeLogBegin(); void TimeLogEnd(); void showTimeLog(); int fnCntTime(); int _tmain(int argc, TCHAR* argv[], TCHAR* envp[]) { int nRetCode = 0; // initialize MFC and print and error on failure if (!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0)) { // TODO: change error code to suit your needs cerr << _T("Fatal Error: MFC initialization failed") << endl; nRetCode = 1; } else { // TODO: code your application's behavior here. TimeLogBegin(); fnCntTime(); TimeLogEnd(); showTimeLog(); getchar(); } return nRetCode; } int fnCntTime() { //do some thing Sleep(1000 * 3); return S_OK; } void TimeLogBegin() { dwTimeBegin = ::GetTickCount(); } void TimeLogEnd() { dwTimeEnd = ::GetTickCount(); } void showTimeLog() { /** The elapsed time is stored as a DWORD value. Therefore, the time will wrap around to zero if the system is run continuously for 49.7 days. */ printf("showTimeUsed: [%d]~[ %d]=[%d mS]/n", dwTimeBegin, dwTimeEnd, (dwTimeEnd - dwTimeBegin)); }

 

<2011_0209_1935>

更精确的时间用下面的函数来完成.

QueryPerformanceCounter和QueryPerformanceFrequency

 

<2011_0210_0101>

计时器类工程完成

/*****************************************************************************/
<2011_0129_2212><home><LostSpeed><ClassStopWatch V1.0.0.1>
* 增加了普通计时器类CLsStopWatchTick
* 增加了高精度定时器CLsStopWatchPerformance
* 进行了重构, 优化了类继承的结构, 使子类的代码量最小化

* 写到一半, 想起以前看到codeproject上一个coder写的类似的计时器类
  不同的地方是我从一个基类CStopWatchBase继承实现了2种不同实现的记时器
  要是以后发现有第N种定时器方法, 还可以通过继承实现新的计时器类

/*****************************************************************************/

调用端的代码

// ClassStopWatch.cpp : Defines the entry point for the console application. // #include "stdafx.h" #include <stdlib.h> #include <time.h> #include "LsStopWatchTick.h" #include "LsStopWatchPerformance.h" int fnUseStopWatchTick();/**< 使用普通定时器 */ int fnUseStopWatchPerformance();/**< 使用高精度定时器 */ int fnUseSomeTime(int nSecond); int fnUseSomeTime_Random(int nSecondBase); int main(int argc, char* argv[]) { printf("Hello World!/n"); fnUseStopWatchTick(); fnUseStopWatchPerformance(); getchar(); return 0; } int fnUseStopWatchTick() {//使用普通定时器 printf(">>int fnUseStopWatchTick()/n"); int nSecondBase = 1; CLsStopWatchTick Watch; /** * 累加计时效果 * start>>stop>>getScore >>start>>stop>>getScore... */ Watch.start(); fnUseSomeTime(nSecondBase); Watch.stop(); printf("after fnUseSomeTime(%d), total time [%.3f]S/n", nSecondBase, Watch.getScore()); Watch.start(); fnUseSomeTime(nSecondBase); Watch.stop(); printf("after fnUseSomeTime(%d), total time [%.3f]S/n", nSecondBase, Watch.getScore()); Watch.start(); fnUseSomeTime_Random(nSecondBase); Watch.stop(); printf("after fnUseSomeTime_Random(%d), total time [%.3f]S/n", nSecondBase, Watch.getScore()); /** * 单次计时效果 * stop>> zero>>start>>stop>>getScore zero>>start>>stop>>getScore ... */ Watch.stop(); Watch.zero(); Watch.start(); fnUseSomeTime(nSecondBase); Watch.stop(); printf("fnUseSomeTime(%d), use time once [%.3f]S/n", nSecondBase, Watch.getScore()); Watch.zero(); Watch.start(); fnUseSomeTime(nSecondBase); Watch.stop(); printf("fnUseSomeTime(%d), use time once [%.3f]S/n", nSecondBase, Watch.getScore()); Watch.zero(); Watch.start(); fnUseSomeTime_Random(nSecondBase); Watch.stop(); printf("fnUseSomeTime_Random(%d), use time once [%.3f]S/n", nSecondBase, Watch.getScore()); /** run results >>int fnUseStopWatchTick() after fnUseSomeTime(1), total time [1.000]S after fnUseSomeTime(1), total time [2.000]S after fnUseSomeTime_Random(1), total time [9.328]S fnUseSomeTime(1), use time once [1.000]S fnUseSomeTime(1), use time once [1.000]S fnUseSomeTime_Random(1), use time once [7.328]S */ return S_OK; } int fnUseStopWatchPerformance() {//使用高精度定时器 printf(">>int fnUseStopWatchPerformance()/n"); int nSecondBase = 1; CLsStopWatchPerformance Watch; /** * 累加计时效果 * start>>stop>>getScore >>start>>stop>>getScore... */ Watch.start(); fnUseSomeTime(nSecondBase); Watch.stop(); printf("after fnUseSomeTime(%d), total time [%.6f]S/n", nSecondBase, Watch.getScore()); Watch.start(); fnUseSomeTime(nSecondBase); Watch.stop(); printf("after fnUseSomeTime(%d), total time [%.6f]S/n", nSecondBase, Watch.getScore()); Watch.start(); fnUseSomeTime_Random(nSecondBase); Watch.stop(); printf("after fnUseSomeTime_Random(%d), total time [%.6f]S/n", nSecondBase, Watch.getScore()); /** * 单次计时效果 * stop>> zero>>start>>stop>>getScore zero>>start>>stop>>getScore ... */ Watch.stop(); Watch.zero(); Watch.start(); fnUseSomeTime(nSecondBase); Watch.stop(); printf("fnUseSomeTime(%d), use time once [%.6f]S/n", nSecondBase, Watch.getScore()); Watch.zero(); Watch.start(); fnUseSomeTime(nSecondBase); Watch.stop(); printf("fnUseSomeTime(%d), use time once [%.6f]S/n", nSecondBase, Watch.getScore()); Watch.zero(); Watch.start(); fnUseSomeTime_Random(nSecondBase); Watch.stop(); printf("fnUseSomeTime_Random(%d), use time once [%.6f]S/n", nSecondBase, Watch.getScore()); /** run results >>int fnUseStopWatchPerformance() after fnUseSomeTime(1), total time [0.999893]S after fnUseSomeTime(1), total time [1.999942]S after fnUseSomeTime_Random(1), total time [9.328429]S fnUseSomeTime(1), use time once [0.999936]S fnUseSomeTime(1), use time once [0.999944]S fnUseSomeTime_Random(1), use time once [7.328384]S */ return S_OK; } int fnUseSomeTime(int nSecond) { Sleep(nSecond * 1000); return S_OK; } int fnUseSomeTime_Random(int nSecondBase) { int n = 0; int nMax = 0; int m = 0; srand((unsigned)time( NULL )); fnUseSomeTime(nSecondBase); nMax = (INT)(100 * rand() / RAND_MAX); for(n = 0; n < nMax; n++) { /** * trush code */ for(m = 0; m < n; m++) Sleep(1); } return S_OK; }

工程下载点:

http://download.youkuaiyun.com/source/3015154
srcClssStopWatch_V2011_0210_0108