Problem with Process and his OutputStream

Hey guys,

i hope you can help me with my little problem.

I want to execute a cmd command with the ProcessBuilder, but for some reason writing information to the stdin of the console doesnt work properly.

I tried the following:

public void herunterFahren(String adminaccount, String adminpass) throws RemoteException { ProcessBuilder builder = new ProcessBuilder("cmd", "/c", "runas /user:" + adminaccount + " \"shutdown -s -t 0 -f\""); try { Process process = builder.start(); BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream())); PrintWriter writer = new PrintWriter(process.getOutputStream()); String input = ""; while((input = reader.readLine()) != null) { System.out.println(input); } writer.println(adminpass); writer.flush(); } catch(IOException e) { e.printStackTrace(); } }

The output on the console is as expected the question for the admin password. But when i try to write the pass to the console nothing happens.


Best wishes

Stefan Litzel

Stefan Litzel wrote:But when i try to write the pass to the console nothing happens.

Is your code even getting that far? You are reading from the process' output stream until EOF (indicated by a null). I wouldn't expect that to happen until the process terminates. Try printing to the screen between your read and write.

I also tried it without the InputStream of the cmd program. Still the same.