A Text File Logging system for use in VC++ projects

.

Environment: This code was compiled and tested with Visual C++ 6.0

In many applications it is necessary to have a logging system which logs text into a file.The following class provides such a logging system which is very easy to use.

The features include

1. Logging of text directly / using string table ids

2. Tracking of log file size (displays warning messages without affecting further logging)

3. automatically provides date and time with the log message

4. ablility to clear the log file etc..

How does the output text file look like ?

format is Date    Time    Logged text

For Example:

01/17/99 17:02:46 Here goes ur text

How do I integrate it with my existing code or how do I use it?

Just add the two files into ur project and in the appclass or ur project create an object like this

In the header (.h) file


#include "log.h"

class CSomeApp : public CWinApp
{
public:
 CSomeApp();
 CLog m_Log;

 ...
};

In the implementation (.cpp) file

CSomeApp::CSomeApp():m_Log("log file name") // see log
constructor for more details
{
 // TODO: add construction code here
}

and where ever you want to log u can use code like this...


extern CSomeApp theApp;
theApp.m_Log.LogMessage("this is what is logged");    // see

LogMessage for more details

or you can use these macros


// macro to log a string directly

#ifndef LOGS
 #define LOGS(sz) ((CSomeApp*)AfxGetApp())->m_Log.LogMessage(sz)
#endif

// macro to log  a string using a  string table id
#ifndef LOGN
 #define LOGN(a) ((CSomeApp*)AfxGetApp())->m_Log.LogMessage(a)
#endif

Download source - 3 KB



Comments

  • This code will fail if Program crashes in middle.

    Posted by Legacy on 02/03/1999 12:00am

    Originally posted by: Shashik

    This object will fail to close the log file, and thus all the details that were entered in the log file will be lost, if the application crashes in between. I think it would work if you open file in append mode and log the message, and as it is close the file. Just let me know whether I'm right.
    Thank you.

    Reply
Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • On-demand Event Event Date: July 28, 2016 Jepsen tests are third-party tests for distributed databases that validate vendors' guarantees about how they perform under various failure scenarios, especially network partitions. These have proven their value as tools in any distributed system tester's arsenal. When the creator of Jepsen, Kyle Kingsbury, started his Jepsen-for-Hire business last fall, VoltDB immediately got in line, and over the past two months, our solution was given the most stringent Jepsen …

  • Microsoft® Office 365 is a top choice for enterprises that want a cloud-based suite of productivity/ collaboration applications. With Office 365, you get access to Microsoft™ Office solutions practically anytime, anywhere, on virtually any device. It's a great option for current Microsoft users who can now build on their experience with Microsoft™ solutions while enjoying the flexibility of a cloud-based delivery. But even organizations with no previous investment in Microsoft will find that …

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date