Forums > MaxMSP

mxj object heaven (not…)

Mar 20 2011 | 9:32 pm


I wonder if anyone has had trouble with the mxj object..
I’ve just built a java external invoking it with mxj that
1. calls an executable.
2. reads its output and prints it.

I’ve implemented the above logic in the bang method:

public void bang()

// launch EXE and grab stdin/stdout and stderr
Process process = Runtime.getRuntime ().exec ("F:/test.exe");

InputStream is = process.getInputStream();
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String line=null;
while ((line = br.readLine()) != null)
catch (Exception err)

When i send a bang to that external, the patch launches the test.exe process but subsequently freezes (windows vista, maxforlive 5.1.7)
and prints the output when I kill the process with process explorer.

I tried to execute the same code in a java program and there it run successfully.
Does anyone know of issues with the mentioned readline methods in max/msp?
Any hints would be greatly appreciated.

warm regards

Mar 20 2011 | 9:50 pm

Without knowing what your external process is it’s hard to say, but have you tried spawning a new Thread and executing the code there?

Mar 21 2011 | 11:43 am

That did the trick! Many many thanks for pointing this out !

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Forums > MaxMSP