WINCE日志类

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jimmy54

最新推荐文章于 2025-06-24 16:31:31 发布

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本文介绍了一种在WinCE平台上的日志类实现，特别关注于如何通过修改代码来实现毫秒级别的计时精度。通过利用QueryPerformanceCounter函数并结合系统的频率进行换算，成功实现了毫秒级别的计时。

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WINCE日志类

找了一个不错的wince日志类
http://www.smartphonedn.com/articles/stlog.html

使用中有点疑问

就是记录日志的时候不能取得毫秒数

查阅了类中的代码

BOOL GetTimeString(LPSTR szString, int nStringSize)

{

SYSTEMTIME st;

GetLocalTime(&st);

#ifdef STLOG_USE_PERFORMANCE_COUNTER

LARGE_INTEGER counter;

QueryPerformanceCounter(&counter);

return (0 < _snprintf(szString, nStringSize, "%02u:%02u:%02u(%I64d)", st.wHour, st.wMinute, st.wSecond, counter.QuadPart));

#else

return (0 < _snprintf(szString, nStringSize, "%02u:%02u:%02u:%03u", st.wHour, st.wMinute, st.wSecond, st.wMilliseconds));

#endif

}

似乎是 GetLocalTime确实没有返回毫秒数

代码：

LARGE_INTEGER counter;

QueryPerformanceCounter( & counter);

返回的是一个系统级别的时间，单位是和系统的频率有关系的

看看的的一个日志
19:24:00(2025034847),thr 0xEFAE43F2 : =============================================
19:24:00(2025037662),thr 0xEFAE43F2 : Log is started on 10.12.2005, at 19:24:00:000, executable: /ConnectDemo.exe (ProcID: 0xef312f9a), compile time : Dec 10 2005 19:10:43
19:24:00(2025039310),thr 0xEFAE43F2 : ***Counter 0 at C:/ConnectDemo/ConnectDemoDlg.cpp,66 initialized
19:24:00(2025040604),thr 0xEFAE43F2 : Counter 0 started
19:24:00(2025062483),thr 0xEFAE43F2 : Counter 0 check point at line 82: 20333 ms from start, 20333ms from last checkpoint
19:24:00(2025461301),thr 0xEFAE43F2 : Counter 0 check point at line 101: 419054 ms from start, 398721ms from last checkpoint
19:24:00(2025463041),thr 0xEFAE43F2 : Counter 0 stopped 421045ms from start, 1991ms from last checkpoint
19:24:01(2029917182),thr 0xEFAE43F2 : Counter 0 started
19:24:01(2029921255),thr 0xEFAE43F2 : Counter 0 check point at line 82: 2272 ms from start, 2272ms from last checkpoint
19:24:01(2029998846),thr 0xEFAE43F2 : Counter 0 check point at line 101: 79754 ms from start, 77482ms from last checkpoint
19:24:01(2030000573),thr 0xEFAE43F2 : Counter 0 stopped 81732ms from start, 1978ms from last checkpoint
19:24:02(2032937140),thr 0xEFAE43F2 : Counter 0 statistics
Counts: 2,
MinTime: 81732 ms,
MaxTime: 421045 ms,
TotalTime: 502777 ms,
AverageTime: 251388 ms
19:24:02(2032939444),thr 0xEFAE43F2 : Log finished

明显ms是错误的，继续在网上查询
查到如下代码：

#include < windows.h >

#include < iostream >

using namespace std;

void main() {

LARGE_INTEGER m_liPerfFreq={0};

QueryPerformanceFrequency(&m_liPerfFreq);

LARGE_INTEGER m_liPerfStart={0};

QueryPerformanceCounter(&m_liPerfStart);

for(int i=0; i< 100; i++)

cout << i << endl;

LARGE_INTEGER liPerfNow={0};

QueryPerformanceCounter(&liPerfNow);

int time=( ((liPerfNow.QuadPart - m_liPerfStart.QuadPart) * 1000)/m_liPerfFreq.QuadPart);

TCHAR buffer[100];

wsprintf(buffer,"執行時間 %d millisecond ",time);

MessageBox(NULL,buffer,"計算時間",MB_OK);

}

看看改改代码成不成，

主要的改动就是两处

///*--------------------------原代码----------------------------

// return (0 < _snprintf(szString, nStringSize, "%02u:%02u:%02u(%I64d)", st.wHour, st.wMinute, st.wSecond, counter.QuadPart));

///*------------------------------------------------------------

///*-------------------------修改后代码-------------------------

return ( 0 < _snprintf(szString, nStringSize, " %02u:%02u:%02u(%08ums) " , st.wHour, st.wMinute, st.wSecond, counter.QuadPart * 1000 / m_nPerfFreq.QuadPart));

///*------------------------------------------------------------

///*--------------------------原代码----------------------------

// CSTLogFile::GetLogFile()->Write("Counter %d statistics/r/n/tCounts: %d,/r/n/tMinTime: %I64d ms,/r/n/tMaxTime: %I64d ms,/r/n/tTotalTime: %I64d ms,/r/n/tAverageTime: %I64d ms",

// m_nCounterIndex, m_nCounter, m_MinTime.QuadPart, m_MaxTime.QuadPart, m_TotalTime.QuadPart, m_TotalTime.QuadPart / m_nCounter);

///*------------------------------------------------------------

///*-------------------------修改后代码-------------------------

unsigned int m_iMinTime = (unsigned int )(m_MinTime.QuadPart * 1000 / m_nPerfFreq.QuadPart);

unsigned int m_iMaxTime = (unsigned int )(m_MaxTime.QuadPart * 1000 / m_nPerfFreq.QuadPart);

unsigned int m_iTotalTime = (unsigned int )(m_TotalTime.QuadPart * 1000 / m_nPerfFreq.QuadPart);

unsigned int m_iAverageTime = (unsigned int )(m_TotalTime.QuadPart / m_nCounter * 1000 / m_nPerfFreq.QuadPart);

CSTLogFile::GetLogFile() -> Write( " Counter %d statistics/r/n/tCounts: %d,/r/n/tMinTime: %08u ms,/r/n/tMaxTime: %08u ms,/r/n/tTotalTime: %08u ms,/r/n/tAverageTime: %08u ms " ,

m_nCounterIndex, m_nCounter, m_iMinTime, m_iMaxTime, m_iTotalTime, m_iAverageTime);

///*------------------------------------------------------------

主要就是×1000/系统的频率

改动后的日志

20 : 56 : 09 (00211262ms),thr 0x4F319EB6 : =============================================

20 : 56 : 09 (00211263ms),thr 0x4F319EB6 : Log is started on 10.12 . 2005 , at 20 : 56 : 09 : 000 , executable: /ConnectDemo.exe (ProcID: 0x4f3162a2 ), compile time : Dec 10 2005 20 : 55 : 54

20 : 56 : 09 (00211263ms),thr 0x4F319EB6 : *** Counter 0 at C:/ConnectDemo/ConnectDemoDlg.cpp, 66 initialized

20 : 56 : 09 (00211264ms),thr 0x4F319EB6 : Counter 0 started

20 : 56 : 09 (00211270ms),thr 0x4F319EB6 : Counter 0 check point at line 82 : 20239 ms from start, 20239ms from last checkpoint

20 : 56 : 09 (00211359ms),thr 0x4F319EB6 : Counter 0 check point at line 101 : 351048 ms from start, 330809ms from last checkpoint

20 : 56 : 09 (00211361ms),thr 0x4F319EB6 : Counter 0 stopped 353002ms from start, 1954ms from last checkpoint

20 : 56 : 09 (00211428ms),thr 0x4F319EB6 : Counter 0 started

20 : 56 : 09 (00211429ms),thr 0x4F319EB6 : Counter 0 check point at line 82 : 2306 ms from start, 2306ms from last checkpoint

20 : 56 : 09 (00211448ms),thr 0x4F319EB6 : Counter 0 check point at line 101 : 72327 ms from start, 70021ms from last checkpoint

20 : 56 : 09 (00211449ms),thr 0x4F319EB6 : Counter 0 stopped 74268ms from start, 1941ms from last checkpoint

20 : 56 : 10 (00212229ms),thr 0x4F319EB6 : Counter 0 statistics

Counts: 2 ,

MinTime: 00000020 ms,