Databases
StackOverflow2013
Postsdbo
POExternal command-line process never returns
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POExternal command-line process never returns
    primarykey
    data
    text
    <p>I'm using the following vb.net code to run an external command line application and read back its output:</p> <pre><code>Public Shared Function Execute(ByVal command As String, ByVal params As String, ByVal workingdir As String) As String psi = New ProcessStartInfo(command) psi.WorkingDirectory = workingdir psi.RedirectStandardOutput = True psi.WindowStyle = ProcessWindowStyle.Hidden psi.UseShellExecute = False psi.CreateNoWindow = True psi.Arguments = params proc = Process.Start(psi) Dim myOutput = proc.StandardOutput proc.WaitForExit() 'Problem is here!!!!!! Dim ret = myOutput.ReadToEnd Return ret End Function </code></pre> <p>This code has worked perfectly for several applications... until now. The problem is this: I'm now using it to run "aapt.exe" (a tool that gives you info on android apk applications) on a bunch o files, and the code gets stuck (never returns) in the point I commented but <strong>only on 3 particular files out of a total of 81</strong></p> <p>Of course my first thought was that the external program was failing/getting stuck on those particular files, but I tested the same command manually from a command prompt and it works perfectly! Furthermore: i added a timeout to the code, like this:</p> <pre><code> proc.WaitForExit(10000) </code></pre> <p>And in this case the process returns (obviously) but what is interesting is that <strong>the output is correct and complete!</strong> This implies that the external program is running correctly until the end, so why doesn't the process return on its own?? Is there any feasible way to debug this?</p> <p>Thanks</p> <p>EDIT: After hours of testing, I came to the conclusion that the problem lies in the "RedirectStandardOutput" option. No matter which order I execute/read it it hangs on some executions. I didn't find a proper solution to this, I implemented a (horrible) workaround where I disable stdout redirection and instead output the stdout to a file, then immediately re-read it in my code when the process terminates (it does terminate properly this way at least). Not an elegant solution, and I'd still like to get to the bottom of this, so I'm leaving the question open if anyone has better ideas than mine.</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USMaster_T
    1. USMaster_T
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POExternal command-line process never returns
      1. This table or related slice is empty.
      1. VTUpMod
    1. COHave you tried running the program on one of those problem files (from the command line) to see if its behavior is any different from when run with one of the non-problem files? Perhaps the program is hanging after doing all of the processing.
      singulars
      1. POExternal command-line process never returns
      1. USJim Mischel
    2. CO@Jim: yes, read all my question, as I state: runs perfectly from the command line.
      singulars
      1. POExternal command-line process never returns
      1. USMaster_T
    3. COWhat are the names of the files that fail? Are those file names passed in the `params` argument?
      singulars
      1. POExternal command-line process never returns
      1. USMatt
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload