C++实现简单日志类

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一个简单的记录日志至文件或者（标准输出及错误文件），不包括系统日志。

直接上代码：

LogFile.h

#ifndef LOG_FILE_INC#define LOG_FILE_INCclass LogFile{public:   LogFile() ;   virtual ~LogFile() ;   static void open( const char *logFName_ ) ;   static void close() ;   static void puts( const char *str ) ;   static void date( const char *prefixStr ) ;   static void hostname( const char *prefixStr ) ;   static void printf( const char *msg , ... ) ;   static FILE *getFD() { return outFD ; } ;private:   static char        *logFName ;   static FILE        *outFD ;};#endif

LogFile.cpp

#include "LogFile.h"#include "time.h"#include "unistd.h"FILE *LogFile::outFD = NULL ;char *LogFile::logFName = NULL ;LogFile::LogFile(){}LogFile::~LogFile(){}void LogFile::open( const char *logFName_ ){   if ( outFD != NULL )      error("LogFile::open - outFD != NULL. File already open.") ;   if ( (logFName_ == NULL) || (logFName_[0] == '\0') )      return ;   if ( strcmp( logFName_ , "stdout" ) == 0 )      outFD = stdout ;   else if ( strcmp( logFName_ , "stderr" ) == 0 )      outFD = stderr ;   else   {      logFName = new char[strlen(logFName_)+1] ;      strcpy( logFName , logFName_ ) ;      if ( (outFD = fopen( logFName , "wb" )) == NULL )         error("LogFile::init - error opening log file: %s" , logFName) ;   }}void LogFile::close(){   if ( (outFD != NULL) && (outFD != stdout) && (outFD != stderr) )      fclose( outFD ) ;   outFD = NULL ;   delete [] logFName ;   logFName = NULL ;}void LogFile::puts( const char *str ){   if ( outFD == NULL )      return ;   if ( (str == NULL) || (str[0] == '\0') )      error("LogFile::puts - str undefined") ;   fputs( str , outFD ) ;   fflush( outFD ) ;}void LogFile::date( const char *prefixStr ){   if ( outFD == NULL )      return ;   if ( prefixStr != NULL )   {      fprintf( outFD , "%s " , prefixStr ) ;   }   time_t t = time(NULL) ;   fputs( ctime( &t ) , outFD ) ;   fflush( outFD ) ;}void LogFile::hostname( const char *prefixStr ){   if ( outFD == NULL )      return ;   if ( prefixStr != NULL )   {      fprintf( outFD , "%s " , prefixStr ) ;   }   char str[100] ;   if ( gethostname( str , 100 ) < 0 )   {      fprintf( outFD , "UNKNOWN HOST\n" ) ;   }   else   {      fprintf( outFD , "%s\n" , str ) ;   }   fflush( outFD ) ;}void LogFile::printf( const char *msg , ... ){   if ( outFD == NULL )      return ;   va_list args ;   va_start( args , msg ) ;   vfprintf( outFD , msg , args ) ;   va_end(args);   fflush( outFD ) ;}