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SageTV Studio Discussion related to the SageTV Studio application produced by SageTV. Questions, issues, problems, suggestions, etc. relating to the Studio software application should be posted here.

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Old 11-22-2005, 06:16 PM
infiniti_guy infiniti_guy is offline
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Executable Error Code Return

Is there a way to launch an executable via "ExecuteProcess" command and receive an error code for the executable into Sage/Studio?

For example, I have an executable that returns 0 for success and 1 for error, and I want to read that error code via a return from the execute process command to know if my process was successful.

I know there are some other ways to do this with files and parsing, but they are much less elegant. Can I get the error code directly from the executable easily with Studio?

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Old 11-22-2005, 06:24 PM
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Opus4 Opus4 is offline
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While I haven't used this... the API docs for ExecuteProcess() say that it returns "the java.lang.Process object that represents the launched process". So, perhaps you could then use the exitValue() method from java.lang.Process?

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Old 11-22-2005, 06:30 PM
infiniti_guy infiniti_guy is offline
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Thanks Andy... Will try this and report back.
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Old 11-23-2005, 03:09 AM
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nielm nielm is offline
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Note that ExecuteProcess will run the process in the background, so you need to first wait for the process to exit first using: java_lang_Process_waitFor(p), otherwise you will get a IllegalThreadStateException...
This will block the Sage UI unless you run it in a separate thread, so you need to Fork()...

-> p=ExecuteProcess("my.exe", "args",null,true)
    +-> IF p != null
        +-> Fork()
            +-> java_lang_Process_waitFor(p)
                +-> ExitVal=java_lang_Process_exitValue(p)
As an example, look at the code for running Comskip in Malore's STV -- he executes a process, forks a thread, waits for the process, then reads the result...

One other warning... For ExecuteProcess, setting the last arg to true discards the output of the process, which is normally what you want to happen.

If you actually want to read and use the output of the process in Sage, set it last arg to false, but you MUST read both the stdout and stderr of the process (usually in 2 separate threads) otherwise the process will block on output and run forever.

More help with Java Process execution can be found in this Java World article.
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Last edited by nielm; 11-23-2005 at 04:42 AM.
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Old 11-23-2005, 03:25 PM
infiniti_guy infiniti_guy is offline
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Join Date: Sep 2004
Posts: 116

That did the trick. I didn't have the IF or Wait in my test code and I got the errors you mentioned. Now its returning the values properly, and I'm not using the console returns, so discarding them works just fine

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