C++日志记录类logging

// Copyright (c) 2012 Ohyo net work. All rights reserved.// 2012/01/04// logging.h////#ifndef __INCLUDE_LOGGING_H__#define __INCLUDE_LOGGING_H__#include "str_conv.inl"#include <iostream>#include <sstream>#include <string>#include <cstring>#include <fstream>#ifdef _WIN32#include <windows.h>#include <shlobj.h>#include <shlwapi.h>#pragma comment(lib, "shlwapi.lib")#else#include <locale.h>#include <string.h>#endif#ifndef BEGIN_NAMESPACE#define BEGIN_NAMESPACE(x) namespace x {#endif#ifndef END_NAMESPACE#define END_NAMESPACE(x) }#endif#ifndef DISALLOW_COPY_AND_ASSIGN#define DISALLOW_COPY_AND_ASSIGN(TypeName)\TypeName(const TypeName&);\void operator=(const TypeName&)#endifBEGIN_NAMESPACE(logging)enum LOG_LEVEL {LOG_NONE= 0,LOG_DEBUG= 1<< 0,LOG_INFO= 1<< 1,LOG_WARNING= 1<< 2,LOG_ERROR= 1<< 3,LOG_EXCEPTION= 1<< 4,_LOG_ALL_= 0xFFFFFFFF};#if defined(_DEBUG)__declspec(selectany) volatile unsigned long g_dwLogLevel = static_cast<unsigned long>(_LOG_ALL_);#else//release版本 不记录任何信息.__declspec(selectany) volatile unsigned long g_dwLogLevel = static_cast<unsigned long>(LOG_NONE);#endifconst char *const G_pwszLogLevel[] = {"NONE","DEBUG","INFO","WARNING","ERROR","EXCEPTION"};#ifndef __FUNCTION_W__#define WIDEN2(x) L ## x#define WIDEN(x) WIDEN2(x)#define __FUNCTION_W__ WIDEN(__FUNCTION__)#endifclass log{private:DISALLOW_COPY_AND_ASSIGN(log);protected:LOG_LEVELm_LogLevel;const char*pfile;std::ostringstream m_stream;public:explicit log(LOG_LEVEL leval, const char *pszFile, int iLine){m_LogLevel = leval;m_stream << "[";switch(m_LogLevel){case LOG_DEBUG:m_stream << G_pwszLogLevel[1];break;case LOG_INFO:m_stream << G_pwszLogLevel[2];break;case LOG_WARNING:m_stream << G_pwszLogLevel[3];break;case LOG_ERROR:m_stream << G_pwszLogLevel[4];break;case LOG_EXCEPTION:m_stream << G_pwszLogLevel[5];break;default:m_stream << G_pwszLogLevel[0];break;}SYSTEMTIME st;::GetLocalTime(&st);char szTime[128] = {0};::wnsprintfA(szTime, _countof(szTime), "[%04u-%02u-%02u_%02u:%02u:%02u_%03u_%u] ",st.wYear, st.wMonth, st.wDay,st.wHour, st.wMinute, st.wSecond, st.wMilliseconds, st.wDayOfWeek);m_stream << "] " << szTime << pszFile << ":" << iLine << " ";}~log(){if(m_LogLevel & GetLogLevel()){m_stream << std::endl;std::string str_newline(m_stream.str());CheckLogDir();std::ofstreamoutfile(GetLogFileName(), std::ios::app);outfile << str_newline;//std::cout << wstr_newline;}m_LogLevel = LOG_NONE;}std::ostream& stream() { return m_stream; }private:static BOOL CheckLogDir(void){wchar_twszLogFile[MAX_PATH];::StrCpyNW(wszLogFile, GetLogFileName(), _countof(wszLogFile));::PathAppendW(wszLogFile, L"..\\");if( ! ::PathFileExistsW(wszLogFile))//判断文件夹是否存在{::SHCreateDirectoryExW(NULL, wszLogFile, NULL);//创建多级文件夹}return TRUE;}public:static wchar_t* GetLogFileName(void)#if defined(_MSC_VER){static wchar_twszLogFile[MAX_PATH] = {0};if( ! wszLogFile[0]){LPITEMIDLISTlpIdl = NULL;if(S_OK == ::SHGetSpecialFolderLocation(NULL, CSIDL_PERSONAL, &lpIdl) && lpIdl){::SHGetPathFromIDListW(lpIdl, wszLogFile);::PathAppendW(wszLogFile, L"DouXie\\DxGame.log");}::CoTaskMemFree(static_cast<void*>(lpIdl));}return wszLogFile;}#else//TODO#endif#if defined(_MSC_VER)////这个类用于保留Last error值//// Stores the current value of GetLastError in the constructor and restores// it in the destructor by calling SetLastError.// This is useful since the LogMessage class uses a lot of Win32 calls// that will lose the value of GLE and the code that called the log function// will have lost the thread error value when the log call returns.class CSaveLastError {public:CSaveLastError() { m_dwLastErrorCode = ::GetLastError(); }~CSaveLastError() { ::SetLastError(m_dwLastErrorCode); }unsigned long GLE() const { return m_dwLastErrorCode; }protected:unsigned long m_dwLastErrorCode;};CSaveLastError m_last_error;#endifpublic:static unsigned long SetLogLevel(unsigned long dwNewLevel){unsigned long old = g_dwLogLevel;g_dwLogLevel = dwNewLevel;return (old);}static unsigned long GetLogLevel(void){return (g_dwLogLevel);}};// This class is used to explicitly ignore values in the conditional// logging macros.  This avoids compiler warnings like "value computed// is not used" and "statement has no effect".class VoidifyLog {public:VoidifyLog() { }// This has to be an operator with a precedence lower than << but// higher than ?:void operator&(std::ostream&) { }};#define LOG_IS_ON(severity) \(severity & ::logging::g_dwLogLevel)#define LAZY_STREAM(stream, condition) \!(condition) ? (void) 0 : ::logging::VoidifyLog() & (stream)#define LOG_STREAM(severity) ::logging::log(severity, __FILE__, __LINE__).stream()#ifdef _NO_LOG_#define LOG(level) LAZY_STREAM(LOG_STREAM(::logging::LOG_ ## level), (0))#define LOG_IF(level, condition) LAZY_STREAM(LOG_STREAM(::logging::LOG_ ## level), (0))#else#define LOG_IF(level, condition) LAZY_STREAM(LOG_STREAM(::logging::LOG_ ## level), LOG_IS_ON(::logging::LOG_ ## level) && (condition))#define LOG(level) LAZY_STREAM(LOG_STREAM(::logging::LOG_ ## level), LOG_IS_ON(::logging::LOG_ ## level))#endif_inline BOOL ResetLogFile(void){::DeleteFileW(::logging::log::GetLogFileName());SYSTEMTIME st;::GetLocalTime(&st);char szTime[128] = {0};::wnsprintfA(szTime, _countof(szTime), "[%04u-%02u-%02u_%02u:%02u:%02u_%03u_%u] ",st.wYear, st.wMonth, st.wDay,st.wHour, st.wMinute, st.wSecond, st.wMilliseconds, st.wDayOfWeek);LOG(INFO) << "Log file reset "<< szTime;return TRUE;}END_NAMESPACE(logging)#endif//  #ifndef __INCLUDE_LOGGING_H__