B4J Question how to run b4j app from another b4j app?

[ilan]

hello

can i run a b4j app from another b4j app?
and also send data?

thanx

 

[Cableguy]

To exchange data the "best" way is to have a common DataFile. As to run another b4j app, is just a matter of "shelling" it

 

[ilan]

yes you are right. just saw this post from erel

Running exe file, getting file not found, CreateProcess error=2

if I am putting notepad.exe in the same directory it is working, when putting 1.exe which is java app that was created using b4j it will not run with the following error Error: org.apache.commons.exec.ExecuteException: Execution failed (Exit value: -559038737. Caused by java.io.IOException...

www.b4x.com

it solves the issue of running another b4j app.
and about sharing data i think i will store it in a file and when the app starts it will read from it and delete it since i dont want the data to stay locally.

thanks

 

[Daestrum]

It might be worth considering generating a random filename in app 1 then passing that as a parameter to app 2 , that way sneaky people won't know what name to look for.

 

[DonManfred]

it solves the issue of running another b4j app

you can use it to give parameters to the other app too.
They arrive in

AppStart (Args() As String)

the Args-Parameter(s) ;-)

 

[ilan]

It might be worth considering generating a random filename in app 1 then passing that as a parameter to app 2 , that way sneaky people won't know what name to look for.

this is a very good idea, thanks! ?

you can use it to give parameters to the other app too.
They arrive in

AppStart (Args() As String)

the Args-Parameter(s) ;-)

great this is what i needed to know! ?

 

[stevel05]

It might be worth considering generating a random filename in app 1 then passing that as a parameter to app 2 , that way sneaky people won't know what name to look for.

This is the way I implemented this in one of my apps. I didn't use a random file name, but it works well. You can pass a small amount of data as a parameter but the length is limited, if you don't know how much data will need to be passed, it is easier and safer to use a file and pass the path to it.

I also used the same filename to send data back when required.

 

[ilan]

This is the way I implemented this in one of my apps. I didn't use a random file name, but it works well. You can pass a small amount of data as a parameter but the length is limited, if you don't know how much data will need to be passed, it is easier and safer to use a file and pass the path to it.

I also used the same filename to send data back when required.

i am saving the data to a file (random name) -> passing the path -> open the other app
other app getting the path from args() -> processing the data - deleting the file

works perfect! thanks again ?