How to create log file and how it use?

[Atul23]

Hi All I am developing project in VC++ 6.0 and I want to use log file in my application, so this file to be create and how it use in project. Thnaks Atool Atool

[dharani]

Hi You can use the function below which opens a log.txt in your exe's local folder and writes whatever message you pass thro it . Its also threadsafe . If your application is single threaded then remove CSingleLock stuff ... if flag is 0 then 'msg' is written to log only and not printed in console . If you want to do both - then pass flag =1... int WriteMessage(CString msg,UINT flag){ int ret=0; CSingleLock sLock(&sec);// remove this if your app is single threaded.. sLock.Lock();//remove this if your app is single threaded.. TRY { ret=logfile.Open("log.txt",CStdioFile::modeWrite );// try opening log.txt if(ret==1)// if succeeded { logfile.SeekToEnd();//go to end of log file CTime t = CTime::GetCurrentTime();// time stamp stuff CString tim=t.Format("%m/%d/%Y %H:%M:%S : "); tim=tim+msg+"\n"; logfile.WriteString(tim);//write to log with the message passed thro "msg" logfile.Close();//close the file if(flag) { cout<m_cause << "\n"; #endif } END_CATCH sLock.Unlock();//remove this if your app is single threaded.. return ret; }

redindian

[Rems Kris]

You can use std::basic_fstream for creating a log file. You can use open(), write() etc to write to the file. If multiple applications will use the log file, use some synchronization objects, for eg: Mutex.

[Atul23]

Hi Dharani Thanks for help, but in your code you use logfile object to call WriteString and close(), so how this LogFile object, It belongs to which class? Thanks Atool Atool

[David Crow]

These should at least get you started: http://www.codeproject.com/file/fixed-length_logging.asp[^] http://www.codeproject.com/debug/logtrace.asp[^] http://www.codeproject.com/ce/GenericLogFunctionality.asp[^]

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"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

[Hamid Taebi]

And see http://www.codeproject.com/cpp/logfile.asp[^]

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WhiteSky

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