C++简单实现Log日志类轻量级支持格式化输出变量

CLog 头 代码很简单 如果需要的直接Ctrl+C ----Ctrl+V 即可

 1 #ifndef __CLOG__
 2 #define __CLOG__
 3 #include <windows.h>
 4 #include <string>
 5 #include <fstream>
 6 #include <tchar.h>
 7 #include <ctime>
 8 class CLog
 9 {
10 public:
11     CLog();
12     CLog(const std::string LogFile);
13     ~CLog();
14     template <class T>
15     static void WriteLog(T x);
16     //支持格式化输出多参数输出
17     static void WriteLogFormat(const char* format, ...);
18 private:
19     static std::string GetFilePath();
20     std::string m_LogFilePath;
21     static std::string GetSystemTimes();
22     static bool IsPathExist(const std::string FilePath);
23 };
24 //支持输出int double 文本 
25 template <class T> void CLog::WriteLog(T x)
26 {
27     std::fstream of(GetFilePath(), std::ios::app);
28     if (!of.is_open())return;
29     of.seekp(std::ios::end);    //设置文件指针到文件尾部
30     of << GetSystemTimes() <<_T("line: ")<<__LINE__<<_T(" value: ")<< x << std::endl;
31     of.close();    //关闭文件；
32 }
33 #endif

CLog.cpp

 1 #include "Log.h"
 2 CLog::CLog()
 3     :m_LogFilePath("")
 4 {
 5     m_LogFilePath = GetFilePath();
 6     if (IsPathExist(m_LogFilePath))
 7         DeleteFile(m_LogFilePath.c_str());
 8 
 9 }
10 
11 CLog::CLog(const std::string LogFile)
12     :m_LogFilePath(LogFile)
13 {
14     if (IsPathExist(m_LogFilePath))
15         DeleteFile(m_LogFilePath.c_str());
16 }
17 
18 CLog::~CLog()
19 {
20 }
21 
22 void CLog::WriteLogFormat(const char* format, ...)
23 {
24     va_list arglist;
25     std::string strArgData;
26     char szBuffer[0x1024];
27     ZeroMemory(szBuffer, 0x1024);
28     va_start(arglist, format);
29     vsprintf_s(szBuffer, format, arglist);
30     va_end(arglist);
31     strArgData = szBuffer;
32     std::fstream of(GetFilePath(), std::ios::app);
33     if (!of.is_open())return;
34     of << GetSystemTimes() << " Line: " << __LINE__ << " Value: " << strArgData << std::endl;
35     of.close();
36 }
37 
38 std::string CLog::GetFilePath()
39 {
40     std::string FlieTmp;
41     TCHAR szPath[MAX_PATH];
42     ::ZeroMemory(szPath, MAX_PATH);
43     if (!::GetCurrentDirectory(MAX_PATH, szPath))return FlieTmp;
44     FlieTmp = szPath;
45     FlieTmp += _T("\\log.txt");
46     return FlieTmp;
47 }
48 
49 std::string CLog::GetSystemTimes()
50 {
51     time_t Time;
52     CHAR strTime[MAX_PATH];
53     ZeroMemory(strTime, MAX_PATH);
54     time(&Time);
55     tm t;
56     localtime_s(&t, &Time);
57     strftime(strTime, 100, _T("%Y-%m-%d %H:%M:%S "), &t);
58     std::string strTimes = strTime;
59     return strTimes;
60 }
61 
62 bool CLog::IsPathExist(const std::string FilePath)
63 {
64     DWORD dwAttribute = ::GetFileAttributes(FilePath.c_str());
65     return dwAttribute != INVALID_FILE_ATTRIBUTES;
66 }