Solved

Single Instance of Console App?

Posted on 2000-04-13
5
341 Views
Last Modified: 2013-11-20
Can anyone suggest me a fool proof way to limit a console app to single instance?

If somebody tries to start the console app in any or all the possible ways it should pop up th eprevious instance.

0
Comment
Question by:nv3prasad
  • 2
  • 2
5 Comments
 
LVL 1

Expert Comment

by:MT_MU
ID: 2713809
Some good info can be found at...

http://www3.pgh.net/~newcomer/nomultiples.htm
0
 
LVL 11

Expert Comment

by:mikeblas
ID: 2717929

You can just create a named, global object and check for it before continuing.

"popping up" another instance isn't allowable: what if the user is typing in some other window? Abruptly popping up another window without the user expecting it is rude. (And, Windows 2000 and newer are _finally_ actively preventing apps from performing this miserable behaviour!)

-- begin file only1.cpp --

// compile with
//   cl /W4 only1.cpp

#include <stdio.h>
#include <windows.h>

void main()
{
   HANDLE hPrev = CreateEvent(NULL, FALSE, FALSE, "SomeUniqueNameHere");
   if (GetLastError() == ERROR_ALREADY_EXISTS)
   {
      printf("Already running!\n");
      return;
   }

   printf("Not already running.\n");
   printf("Press a key to exit\n");
   getchar();
}

-- end of only1.cpp --

..B ekiM
0
 
LVL 1

Author Comment

by:nv3prasad
ID: 2728107
I tried what you said but does not seem to work, can you post me a sample which can have only one instance of a console application.

My E-mail is pnarahar@hotmail.com
0
 
LVL 1

Author Comment

by:nv3prasad
ID: 2728680
Hi Mike,

I figured out that you were not wrong and it was my mistake to reject your answer.

I will award you the points.

Can you help me to close the console window without it asking me "Press any key to continue" ( this is not your code though!)

Thank you

nv3prasad
0
 
LVL 11

Accepted Solution

by:
mikeblas earned 50 total points
ID: 2729035
> Can you help me to close the console window without
 > it asking me "Press any key to continue" ( this is not
 > your code though!)

If it's not my code, then where is it coming from? Which OS are you using?

..B ekiM
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

Title # Comments Views Activity
deburging in oracle form 12 88
either24  challenge 19 90
haveThree challenge 22 114
Is there a simple front-end menu system. 9 70
Introduction: Ownerdraw of the grid button.  A singleton class implentation and usage. Continuing from the fifth article about sudoku.   Open the project in visual studio. Go to the class view – CGridButton should be visible as a class.  R…
Introduction: Dialogs (1) modal - maintaining the database. Continuing from the ninth article about sudoku.   You might have heard of modal and modeless dialogs.  Here with this Sudoku application will we use one of each type: a modal dialog …
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
As a trusted technology advisor to your customers you are likely getting the daily question of, ‘should I put this in the cloud?’ As customer demands for cloud services increases, companies will see a shift from traditional buying patterns to new…

910 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

23 Experts available now in Live!

Get 1:1 Help Now