Get Batch File Output
I need to execute and capture the output of a batch file from within a java program. The batch file sets up some environment variables and then runs an exe. I can't directly run the exe, I need the batch file to set up the environment. I have a method that I use to get the output of exe's and shell commands and whatnot, but it does not seem to work in this case. Here is the method I am using to try and get the output:
String cmd ="cmd.exe /c batchfile.cmd";
Process p = Runtime.getRuntime().exec(cmd);
InputStream iStr = p.getInputStream();
InputStreamReader reader =new InputStreamReader(iStr);
BufferedReader buff =new BufferedReader(reader);
String line =null;
while ((line = buff.readLine()) !=null){
//process line
}
}
iStr.close();
reader.close();
buff.close();
Any help is appreciated, thanks.
[1202 byte] By [
Losinga] at [2007-11-27 10:58:22]
It's a lot of complicated mess and the batch file may change periodically, the java program needs to be independent of the batch file.
And you're right I think, the exe's output is the output of a different process. What I need may be impossible :(
Not necessarily. in the batch file, when you have it execute the exe, have it redirect the output to a file or better a blocking message-oriented pipe.
: start blah.exe > pipe
you can create pipes with, for example, mkfifo on linux.
Or you might be able to use a PipedInputStream wrapper around a file that you are going to output to (from the batch file) and use receive. I think that may wait until there is new data in the file.
Or if all else fails just spinlock until the file size > 0. or while the InputStream).available() is = 0. Or try read(), that might block for you too.
