Programming Forums > Application Development > Visual Basic

bigguy · Mar 30th, 2006, 9:39 PM

Hey yall. I am wantign to make a program that when it is terminated it reopens it self. I alreayd got that part but I also need it if it is opend once laready not to open it again, Right now it opens 280 times and then the computer freezes. lol. So please help me. Also is it possible to make a program run as a service? If so how?

Thanks again yall

jeffball55 · Mar 30th, 2006, 10:47 PM

What you can do is write a variable to a file when you open the program. Then check that file to see if the program is running. Example: when you're program starts write the number 1 to C:\isrunning.txt. Then whenever you try to start the program first check if the number 1 is in C:\isrunning.txt. Also don't forget to change the number to 0 or something else not 1 before you close your program.

brownhead · Mar 31st, 2006, 12:56 AM

^^hehe, thats the hard way. Try this:

(Toggle Plain Text)

Private Sub Form_Load()
If (App.PrevInstance = True) Then End

App.PrevInstance = True if there is already an instance of your program running.. so this should do the trick

PPoA · Mar 31st, 2006, 1:31 AM

wouldn't that have a lot of overhead though, always trying to start the program then shutting itself down? seems you could put something in the program exit call to start another instance of itself, that way it will only restart itself when it shuts itself down.

Booooze · Mar 31st, 2006, 1:33 AM

Quote:

If (App.PrevInstance = True) Then End

Don't use end. It doesn't clear up everything in memory properly

Use the unload function.

(Toggle Plain Text)

If (App.PrevInstance = True) Then 
     unload Me
end if

brownhead · Mar 31st, 2006, 2:30 AM

^well if you really want to be thorough you can go though and Unload every form using a for loop.. though I always add an End at the end of it just in case

(Toggle Plain Text)

For Each Form In Forms
    Unload Form
Next Form
End

bigguy · Mar 31st, 2006, 1:12 PM

Well see its a progra, that blocks stuff. And I dont want people to use ctrl - alt - del to close it through procesess. So I put it in Form_Terminate to when it closes like that it starts up. But I got it to start up 2 78 times once. So this is why I need this.

Mar 30th, 2006, 9:39 PM	#1
bigguy Professional Programmer Join Date: Sep 2005 Location: Arkansas Posts: 298 Rep Power: 0	Program Open Already? Hey yall. I am wantign to make a program that when it is terminated it reopens it self. I alreayd got that part but I also need it if it is opend once laready not to open it again, Right now it opens 280 times and then the computer freezes. lol. So please help me. Also is it possible to make a program run as a service? If so how? Thanks again yall __________________ Forgiveness is the fragrance that the violet sheds on the heal that has crushed it. - Mark Twain Destruction leads to a very rough road, but it also breeds creation.

Mar 31st, 2006, 12:56 AM	#3
brownhead Programmer Join Date: Mar 2006 Location: California Posts: 37 Rep Power: 0	^^hehe, thats the hard way. Try this: (Toggle Plain Text) Private Sub Form_Load() If (App.PrevInstance = True) Then End Private Sub Form_Load() If (App.PrevInstance = True) Then End App.PrevInstance = True if there is already an instance of your program running.. so this should do the trick

Mar 31st, 2006, 2:30 AM	#6
brownhead Programmer Join Date: Mar 2006 Location: California Posts: 37 Rep Power: 0	^well if you really want to be thorough you can go though and Unload every form using a for loop.. though I always add an End at the end of it just in case (Toggle Plain Text) For Each Form In Forms Unload Form Next Form End For Each Form In Forms Unload Form Next Form End

Mar 31st, 2006, 1:12 PM	#7
bigguy Professional Programmer Join Date: Sep 2005 Location: Arkansas Posts: 298 Rep Power: 0	Well see its a progra, that blocks stuff. And I dont want people to use ctrl - alt - del to close it through procesess. So I put it in Form_Terminate to when it closes like that it starts up. But I got it to start up 2 78 times once. So this is why I need this. __________________ Forgiveness is the fragrance that the violet sheds on the heal that has crushed it. - Mark Twain Destruction leads to a very rough road, but it also breeds creation.

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Mar 30th, 2006, 10:47 PM	#2
jeffball55 Newbie Join Date: Mar 2006 Location: USA Posts: 9 Rep Power: 0	What you can do is write a variable to a file when you open the program. Then check that file to see if the program is running. Example: when you're program starts write the number 1 to C:\isrunning.txt. Then whenever you try to start the program first check if the number 1 is in C:\isrunning.txt. Also don't forget to change the number to 0 or something else not 1 before you close your program.

Mar 31st, 2006, 1:31 AM	#4
PPoA Programmer Join Date: Mar 2006 Location: Tennessee Posts: 41 Rep Power: 0	wouldn't that have a lot of overhead though, always trying to start the program then shutting itself down? seems you could put something in the program exit call to start another instance of itself, that way it will only restart itself when it shuts itself down.

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Programming Forums > Application Development > Visual Basic

Program Open Already?