跨平台c++日志类log

#include <ctime> #include <string> #include <cstdarg> #include "Log.h" #if !defined(_TRUNCATE) #define _TRUNCATE ((size_t)-1) #endif using std::fstream; using std::string; using std::ios; using std::streampos; // 构造函数 filepath表示日志文件完整路径 CLog::CLog(const char *filePath, LOG_LEVEL level): m_showLogFlag(true), m_LogLevel(level), m_maxLogFileSize(10 * 1024 * 1024), m_logFilePath(filePath) { m_fileOut.open(filePath, ios::out | ios::app); m_openSuccess = m_fileOut.is_open(); } CLog::CLog(const wchar_t *filePath, LOG_LEVEL level): m_showLogFlag(true), m_LogLevel(level), m_maxLogFileSize(10 * 1024 * 1024) { #ifdef WIN32 m_fileOut.open(filePath, ios::out | ios::app); m_openSuccess = m_fileOut.is_open(); m_logFilePath = W2A(filePath); #else m_logFilePath = W2A(filePath); m_fileOut.open(m_logFilePath, ios::out | ios::app); m_openSuccess = m_fileOut.is_open(); #endif } void CLog::OpenLogFile(const char *pFilePath, LOG_LEVEL level) { if (pFilePath) { if (m_openSuccess) // 如果已经打开文件 关闭原文件 { CloseLogFile(); } m_fileOut.open(pFilePath, ios::out | ios::app); } m_openSuccess = m_fileOut.is_open(); m_LogLevel = level; m_logFilePath = pFilePath; } void CLog::OpenLogFile(const wchar_t *pFilePath, LOG_LEVEL level) { if (pFilePath) { if (m_openSuccess) // 如果已经打开文件 关闭原文件 { CloseLogFile(); } #ifdef WIN32 m_fileOut.open(pFilePath, ios::out | ios::app); #else string strPath = W2A(pFilePath); m_fileOut.open(strPath, ios::out | ios::app); #endif } m_openSuccess = m_fileOut.is_open(); m_LogLevel = level; m_logFilePath = W2A(pFilePath); } // <Summary>宽字节字符转多字节字符</Summary> // <DateTime>2013/9/9</DateTime> // <Parameter name="pWcsStr" type="IN">宽字节字符串</Parameter> // <Returns>多字节字符串</Returns> string CLog::W2A(const wchar_t *pWcsStr) { size_t wcsStrLen = wcsnlen(pWcsStr, _TRUNCATE) + 1; // 宽字符串pWcsStr 字符个数 包括null字符 char *pDestString = (char *)malloc(wcsStrLen); // 申请转换后的字符串内存空间 if (NULL == pDestString) { return string(""); } size_t numberOfCharConverted = 0; // 实际转化的字符个数 包括null字符 wcstombs(pDestString, pWcsStr, _TRUNCATE); // 宽字节字符转多字节字符 //wcstombs_s(&numberOfCharConverted, pDestString, wcsStrLen, pWcsStr, _TRUNCATE); string mbsStr(pDestString); free(pDestString); return mbsStr; } // <Summary>得到日志文件大小</Summary> // <DateTime>2013/9/9</DateTime> // <Returns>日志文件大小</Returns> size_t CLog::GetLogFileSize() { if (!m_openSuccess) { return 0; } streampos curPos = m_fileOut.tellg(); // 当前文件指针位置 m_fileOut.seekg(0, ios::end); // 将文件指针指向文件末尾 streampos pos = m_fileOut.tellg(); // 获取文件指针的位置 该值即为文件大小 m_fileOut.seekg(curPos); // 恢复文件指针位置 return static_cast<size_t>(pos); } // 将logText写入日志文件 // level: 该条日志信息级别 logText：日志内容 void CLog::WriteLog(string logText, LOG_LEVEL level) { if (m_openSuccess && level <= m_LogLevel) { string flag; if (level <= LL_ERROR) { flag = "[ERROR] "; } else if (level >= LL_INFORMATION) { flag = "[INFORMATION] "; } else { flag = "[WARN] "; } if (m_showLogFlag) { logText = flag + logText; } if (m_maxLogFileSize > 0 && GetLogFileSize() > m_maxLogFileSize) // 日志信息超过最大日志大小 则先清空日志 { ClearLogFile(); } // 写日志信息 m_fileOut.write(logText.c_str(), logText.size()); // 在日志后添加时间信息 time_t nowTime = time(NULL); struct tm *pLocalTime = localtime(&nowTime); char timeString[100] = {0}; sprintf(timeString, " [%04d-%02d-%02d %02d:%02d:%02d]\n", pLocalTime->tm_year + 1900, pLocalTime->tm_mon + 1, pLocalTime->tm_mday, pLocalTime->tm_hour, pLocalTime->tm_min, pLocalTime->tm_sec); m_fileOut.write(timeString, strnlen(timeString, sizeof(timeString))); m_fileOut.flush(); } return; } void CLog::WriteLog(LOG_LEVEL level, const char *pLogText, ...) { va_list args; char logText[LOG_LINE_MAX] = {0}; va_start(args, pLogText); vsnprintf(logText, LOG_LINE_MAX - 1, pLogText, args); WriteLog(logText, level); } // <Summary>格式化字符串</Summary> // <DateTime>2013/10/31</DateTime> // <Parameter name="srcString" type="IN">需要进行格式化的字符串</Parameter> // <Parameter name="pFormatString" type="IN">格式字符串</Parameter> // <Returns>格式化后的字符串</Returns> const string& CLog::StringFormat(std::string &srcString, const char *pFormatString, ...) { va_list args; char tempString[2048] = {0}; // 格式化字符串最大支持2048个字节 va_start(args, pFormatString); vsnprintf(tempString, sizeof(tempString), pFormatString, args); srcString = tempString; return srcString; } // <Summary>将日志字符串转化为真正的日志信息</Summary> // <DateTime>2013/10/31</DateTime> // <Parameter name="pLogText" type="IN">日志字符串</Parameter> // <Parameter name="level" type="IN">日志级别</Parameter> // <Returns>真正的日志信息</Returns> string CLog::ConvertToRealLogText(const char *pLogText, LOG_LEVEL level) { if (NULL == pLogText) { return string(""); } // 得到当前系统时间 time_t nowTime = time(NULL); struct tm *pLocalTime = localtime(&nowTime); string strLogText(pLogText); string::size_type pos = strLogText.find("$("); while (pos != string::npos) { string::size_type tempPos = strLogText.find(")", pos); if (tempPos != string::npos) { string strSubString = strLogText.substr(pos, tempPos - pos + 1); if (strSubString == string("$(DATE)")) { StringFormat(strSubString, "%04d-%02d-%02d", pLocalTime->tm_year + 1900, pLocalTime->tm_mon + 1, pLocalTime->tm_mday); } else if (strSubString == string("$(TIME)")) { StringFormat(strSubString, "%02d:%02d:%02d", pLocalTime->tm_hour, pLocalTime->tm_min, pLocalTime->tm_sec); } else if (strSubString == string("$(DATETIME)")) { StringFormat(strSubString, "%04d-%02d-%02d %02d:%02d:%02d", pLocalTime->tm_year + 1900, pLocalTime->tm_mon + 1, pLocalTime->tm_mday, pLocalTime->tm_hour, pLocalTime->tm_min, pLocalTime->tm_sec); } else if (strSubString == string("$(LEVELFLAG)")) { if (LL_ERROR == level) { strSubString = "ERROR"; } else if (LL_WARN == level) { strSubString = "WARN"; } else if (LL_INFORMATION == level) { strSubString = "INFORMATION"; } } strLogText.replace(pos, tempPos - pos + 1, strSubString); pos = strLogText.find("$(", tempPos + 1); } else { break; } } return strLogText; } // <Summary> // 新增函数 用于将日志按要求的格式输出 // 以logText的实际内容和格式记录日志，为了便于日志记录，设置一些预定义常量，用于代表某些特殊的信息 // 常量的引用格式，类似makefile文件中的变量，即$(常量名称),常量名称为大写，目标已经可用的常量有： // 1.$(DATE):表示当前日期 格式为YYYY-MM-DD // 2.$(TIME):表示当前时间 格式为HH:MM:SS // 3.$(LEVELFLAG):表示该日志的级别标志 // 4.$(DATETIME):表示当前日期和时间 格式为YYYY-MM-DD HH:mm:SS // 例子：WriteLogEx(LL_ERROR, "[$(DATE) $(TIME)] 线程退出 线程id=%d [$(LEVELFLAG)]", 10); // 效果：[2013-10-31 09:55:30] 线程退出 线程i