How to get the PID of running application in Windows?

Question

I have here my code snippet:

 ArrayList<String> cmd_exec_installer = new ArrayList<String>();
 cmd_exec_installer.add("file.exe");
 Process proc = new ProcessBuilder(cmd_exec_installer).start();

What I want to do is to get the PID of the process started executing file.exe.

Is there a way to do that in Java?

Answer 1

This question was already answered here and here.

Basically, there's no simple way to achieve the task, unless you use the JNI libraries or reflection, as suggested in the linked questions.

Answer 2

This works for me perfectly on Windows 7:

//Imports
import com.sun.jna.*;
import com.sun.jna.platform.win32.Kernel32;
import com.sun.jna.platform.win32.WinNT;


private String getWindowsProcessId(Process proc) 
{
    if (proc.getClass().getName().equals("java.lang.Win32Process")
            || proc.getClass().getName().equals("java.lang.ProcessImpl")) {
        try {
            Field f = proc.getClass().getDeclaredField("handle");
            f.setAccessible(true);
            long handl = f.getLong(proc);
            Kernel32 kernel = Kernel32.INSTANCE;
            WinNT.HANDLE handle = new WinNT.HANDLE(); 

            handle.setPointer(Pointer.createConstant(handl));
            return Integer.toString(kernel.GetProcessId(handle)); 

        } catch (Throwable e) {
        }
    }
    return "";
}

Source: http://cnkmym.blogspot.com/2011/10/how-to-get-process-id-in-windows.html