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source code to implement limited time feature on a software

Posted on 1998-11-19
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Last Modified: 2010-04-15
Can anybody tell me the source code to add the limited time
feature to a software?
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Question by:SHAHZAD
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2 Comments
 
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Expert Comment

by:emmons
ID: 1254478
There are lots of ways to do it.
If you are in Windows, you could add a date to the registry or config file, and compare against that (more robustly, you could encrypt the date before saving it)
You could create a data file for your program on install (or on first run) and then compare against that date. This is a little more portable, but it involves asking the OS for the date stamp on a file and comparing it against the current date. Or put the date in the file.
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Accepted Solution

by:
masche earned 100 total points
ID: 1254479
here is a simple solution of mine:

{
        struct tm *newtime;
        time_t long_time;

        time( &long_time );                /* Get time as long integer. */
        newtime = localtime( &long_time ); /* Convert to local time. */

        if( newtime->tm_year >= 98 )       {
      if( newtime->tm_mon >= 12  )   {
             AfxMessageBox ( "Program has timed out !!!") ;
            timedOut= 1 ;
      }
        }
        if ( !timedOut)       {              // let's check the file PAGEFILE.SYS
                                                          // for those who changed their clock...
      char *FileName = "C:\\PAGEFILE.SYS" ;
       time_t now= time(NULL) ;

      for ( int i=0 ; i<10 ; ++i )     {
           int result;
           struct _stat buf;
           result = _stat( FileName, &buf );
        /* Check if statistics are valid: */
           if( result == 0 )      {
            if ( (now< buf.st_ctime )  )   {
            AfxMessageBox ("You changed your clock! Program ist timed out!!!") ;
            timedOut;
            break ;
               }
      }
      ++FileName[0] ;              // c: / d: / e:...
      }
      }
}

I hope this helped!

Harald
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