Not getting any output after calling C executable file from Java code

Question

I am trying to execute the C code from Java code which is already compiled and executed, but, I am not getting any output from the executable file. Can anyone help me to complete this task?

Code is as follows.

public class Test {
    public static void main(String args[]) {
        try {
            Process processCompile = Runtime.getRuntime().exec("e:/Sample.exe");
        } catch(Exception ex) {
            ex.printStackTrace();
        }
    }
}

C executables are no different from other executables, at least from the point of view of process execution. As @JunedAhsan points out, the problem is that you have to read the executable's output yourself (and either show it or do something with it). — tucuxi
– tucuxi, Commented May 18, 2013 at 6:46
Go through the Java World article linked from the exec info. page, implement all the recommendations, then use a ProcessBuilder to create the Process. — Andrew Thompson
– Andrew Thompson, Commented May 18, 2013 at 7:01

Juned Ahsan · Accepted Answer · 2013-05-18 06:40:56Z

5

Try this:

BufferedReader stdInput = new BufferedReader(new 
     InputStreamReader(processCompile .getInputStream()));


// read the output from the command
System.out.println("EXE OUTPUT");
while ((s = stdInput.readLine()) != null) {
    System.out.println(s);
}

answered May 18, 2013 at 6:40

Juned Ahsan

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2 Comments

Juned Ahsan Over a year ago

Make sure that your C process is actually returning something to the console. Above code is to capture a process output provided there is some output.

Juned Ahsan Over a year ago

@Sankar you can accept the answer so that others can be benefited with it.

Community · Accepted Answer · 2017-05-23 11:49:17Z

0

This method would work only if you run the java program with admin privileges.

If you have privileges, then can you try running your process under "cmd" shell (Which is forked by your java process). An implementation do so this is done here "LinuxInteractor" ( But is in linux). Just minor change needed to port to Windows version.

Finding hard and soft open file limits from within jvm in linux (ulimit -n and ulimit -Hn)

edited May 23, 2017 at 11:49

CommunityBot

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answered May 18, 2013 at 6:39

Denny Mathew

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1 Comment

Sankar Over a year ago

The C program (Sample.exe)is executing from Java Code, I have checked in the task manager, but the problem is that i am not getting any console (output) from the C Program

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