B4J Question Wait for a .exe to finish executing

C

Cal4th

Member
I am executing a .exe with b4j and this .exe is writing me a file while it is executing then it stops and the file finishes writing.i an trying to read this file but since it does not finishes when my line of reading executes then it only reads part of it. Is there a way to wait for the .exe to finish so i can read the hole file written by it?
 
Sort by date Sort by votes
C

Cal4th

Member
Hello Erel,

I am using a .bat to run the .exe since because if i run the .exe directly it takes more space. the code you rote could work with a .bat too? cause i am trying to use it but it does not wait...
it just jumps and never returns to the sub where i have your code.
I have tried using it in different ways:

Way 1:
B4X: 
run(".bat",Null)

Sub run (EXE As String, code As List)    As ResumableSub
    Dim shl As Shell
    shl.Initialize("shl",EXE,code)
    shl.Run(-1)
    Wait For shl_ProcessCompleted (Success As Boolean, ExitCode As Int, StdOut As String, StdErr As String)
    Log(Success)
    Log(StdOut)
    Log(StdErr)

'
    Return ""
    End Sub

Way 2:
B4X: 
    Dim shl As Shell
    shl.Initialize("shl",".bat",Null)
    shl.Run(-1)
    Wait For shl_ProcessCompleted (Success As Boolean, ExitCode As Int, StdOut As String, StdErr As String)
    Log(Success)
    Log(StdOut)
    Log(StdErr)

all this is inside a sub of a function that is inside a loop since I'm iterating many times through the launch if the .bat. So, what "Wait for" does is to go out of the sub where it is and then doo the iterative process. this causes the wait for to never be completed since it will complete until finishing the sub that contains the loop.

I hope i explained myself right so that you can understand and help.
 
Upvote 0

Erel

B4X founder
Staff member
Licensed User
Longtime User
See the video tutorial about resumable subs: https://www.b4x.com/etp.html
It is a very important concept.

It works inside loops.
It is better to set the sender filter:
B4X: 
 Wait For (shl) shl_ProcessCompleted (Success As Boolean, ExitCode As Int, StdOut As String, StdErr As String)

If the event is never raised then it means that the process never ended.
 
Upvote 0

OliverA

Expert
Licensed User
Longtime User
Upvote 0

OliverA

Expert
Licensed User
Longtime User
Cal4th said:
f the program is executed with a .bat, it only uses the necessary to solve what i'm asking him
Click to expand...
How? Can you provide an example?
 
Upvote 0
You must log in or register to reply here.

Similar Threads

R
  • Question
B4J Question [ABMaterial] How to reload a page from code.
Replies
17
Views
2K
alwaysbusy
  • Question
B4J Question Running exe file, getting file not found, CreateProcess error=2
Replies
5
Views
2K
Shay
  • Question
B4J Question Keyword Continue explaination
Replies
2
Views
628
stevel05
  • Question
B4J Question [BANano]: [SOLVED] How to RunJavascriptMethod and wait for it to finish?
Replies
8
Views
2K
Mashiane
A
  • Question
B4J Question Wait For on Mysql read
Replies
4
Views
1K
atiaust
A
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…