Solved

Two Delphi 2 questions

Posted on 1997-05-16
2
163 Views
Last Modified: 2010-04-04
How can I:
1) delete the program file of currently running application
2) check the previous running instance of the application and how to select the running application when attempting to run it twice

... both in Delphi 2

... thanx, Bocian
0
Comment
Question by:Bocian
2 Comments
 
LVL 2

Accepted Solution

by:
icampbe1 earned 50 total points
ID: 1336366
1) I really dont think you can (nor should you be able to).  The program file is treated as a mapped file for the running program.  If you dont have the EXE then you dont have the mapped file, then you dont have the program.  You can't detach the running code (just because it may all be in memory) from the EXE file.

2) Use a Mutex.  If a Mutex is created with CreateMutex(), the lpName parameter holds a unique string identifier.  All of the programs that you want a single instance of should try and call OpenMutex().  OpenMutex will only work if someone actually created the Mutex first with CreateMutex.

Of course, there are kludgier ways like using FindWindow, but that relies on a unique window class or caption name.

Hope this helps...  Cheers,

Ian C.

0
 
LVL 2

Expert Comment

by:gysbert1
ID: 1336367
If you really have to delete the .exe you will have to use a killer .exe shipped with the app, maybe cat'ed to the first one and then dinamically written to a file by your app if you know how to do this. Your app will then execute the killer and exit itself. The killer will wait till the app is shut down and then delete the exe.

I used to do stuff like this in high school. Great fun trying to write incrackable copy protection, etc ...
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

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

Suggested Solutions

Introduction The parallel port is a very commonly known port, it was widely used to connect a printer to the PC, if you look at the back of your computer, for those who don't have newer computers, there will be a port with 25 pins and a small print…
In this tutorial I will show you how to use the Windows Speech API in Delphi. I will only cover basic functions such as text to speech and controlling the speed of the speech. SAPI Installation First you need to install the SAPI type library, th…
Internet Business Fax to Email Made Easy - With  eFax Corporate (http://www.enterprise.efax.com), you'll receive a dedicated online fax number, which is used the same way as a typical analog fax number. You'll receive secure faxes in your email, f…
With the power of JIRA, there's an unlimited number of ways you can customize it, use it and benefit from it. With that in mind, there's bound to be things that I wasn't able to cover in this course. With this summary we'll look at some places to go…

895 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

Need Help in Real-Time?

Connect with top rated Experts

18 Experts available now in Live!

Get 1:1 Help Now