CODEWITHSUNDEEP
java
user234194
user234194

Reputation: 1723

running external program in java

If I am running external program(batch file) from java then, What I need to do: 

if (process.exitValue() == 0) {//means executed successfully ???

Can't the return value be something else and batch executed successfully.

Is that the only way to check??

Upvotes: 2

Views: 514

Answers (6)

Romain Hippeau
Romain Hippeau

Reputation: 24375

In many programs 0 is is success, negative numbers are errors and positive numbers are warnings. Of course this is just a convention and it all depends on what convention was followed. In most programming languages you can define an exit code for a program and that is what is picked up.

In Java System.exit(n)
In C main is defined as int main(int argc, char* argv[]) and the return from main is the return from the program.

Upvotes: 0

Dragisa Krsmanovic
Dragisa Krsmanovic

Reputation: 596

On Linux, your program can return any status you want. By convention 0 means success.

For example, if you execute a shell script, the return status will be the return status of the last command executed in your script.

Upvotes: 0

stacker
stacker

Reputation: 68942

Pick one from here

Upvotes: 1

krock
krock

Reputation: 29619

The exit code of the batch process will be defined by that process but generally an exit code of 0 is defined as successful and a non zero value indicates that something went wrong. In your batch file you can set the return code by calling:

EXIT /B %ERROR_CODE%

%ERROR_CODE% is the number that will be returned as the exit code.

Upvotes: 0

OscarRyz
OscarRyz

Reputation: 199205

You could read the output stream ( or the error stream ) and interpret it

Upvotes: 0

Stephen
Stephen

Reputation: 6087

I'm a bit confused by your wording, but by convention, [exitValue()](http://download.oracle.com/javase/1.4.2/docs/api/java/lang/Process.html#exitValue()) returns 0 upon a successful execution. This is, as far as I know, the only way to check.

EDIT:

I suppose you could use [getErrorStream()](http://download.oracle.com/javase/1.4.2/docs/api/java/lang/Process.html#getErrorStream()) - I assume it'll be blank if there are no errors in the process...

Upvotes: 1

Related Questions