Calling an executable

[Guest_imported]

Does anyone know how I can call an executable in Java? The corresponding thing in c++ is _execl.
thanks

 

[palbano]

Brent,

java.lang.Runtime.getRuntime().exec(...);

There are four forms of exec()

Hope this helps
-pete

 

[jnicho02]

Just been reading some interesting stuff about possible traps in runtime exec...

http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html

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[Donald]

here's an example. it prints the name of your computer. put any .exe into "cmd" but things like dir and set don't seem to work:

try{
String cmd = "hostname";
Process pr = Runtime.getRuntime().exec(cmd);
InputStream is = pr.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(is));
String line;
while( (line = br.readLine()) != null ){
System.out.println(line);
}
br.close();

}catch(Exception e){System.out.print("\nError :"+e);}

 

[jnicho02]

Donald, please see my post above. The article explains that runtime exec is not a command line (even though it takes a parameter named cmd!). Things like 'dir' are operating system specific, therefore you would have to test whether you are on windows then run the Windows command.exe to execute Windows commands.

The article also explains that there can be problems if you don't empty the buffers of the exec, e.g. if your exec failed and produced an error message it might fill up the buffer and throw a bigger error in your Java. My Home -->

http://www.geocities.com/jnicho02/