Solved

source code to implement limited time feature on a software

Posted on 1998-11-19
2
182 Views
Last Modified: 2010-04-15
Can anybody tell me the source code to add the limited time
feature to a software?
0
Comment
Question by:SHAHZAD
2 Comments
 
LVL 4

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.
0
 

Accepted Solution

by:
masche earned 50 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
0

Featured Post

Master Your Team's Linux and Cloud Stack

Come see why top tech companies like Mailchimp and Media Temple use Linux Academy to build their employee training programs.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

An Outlet in Cocoa is a persistent reference to a GUI control; it connects a property (a variable) to a control.  For example, it is common to create an Outlet for the text field GUI control and change the text that appears in this field via that Ou…
Examines three attack vectors, specifically, the different types of malware used in malicious attacks, web application attacks, and finally, network based attacks.  Concludes by examining the means of securing and protecting critical systems and inf…
The goal of this video is to provide viewers with basic examples to understand and use pointers in the C programming language.
The goal of this video is to provide viewers with basic examples to understand recursion in the C programming language.

772 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question