[platform-swt-dev] Updating text widget from stdOut

["Etienne Le Sueur" <lists@xxxxxxxxxxxxx>]

Hi,

 

I’m trying to write a simple client for OpenVPN using SWT, and want to redirect the output from the command into a text widget.

 

The client needs to continue to respond after the command has been issued.

 

I am reading the stdOut from the command like this:

 

p = Runtime.getRuntime().exec( … path to openvpn … ) );

BufferedReader br = new BufferedReader( new InputStreamReader( p.getInputStream() ) );

 

br.readLine() blocks when there is nothing coming, so any loop will result in deadlock, because the openvpn process stays executing.

 

I tried putting the block in a Runnable like this:

 

d.syncExec( new Runnable() {

                             

public void run() {

                             

      BufferedReader br = new BufferedReader( new InputStreamReader( p.getInputStream() ) );

            String line;

            try {

                                         

                  while ( (line = br.readLine()) != null)

                        logWnd.append(line+"\n");

                                         

            } catch(IOException e) {}

      }

                             

} );

 

But the GUI program hangs when OpenVPN stops outputting to stdOut.

Can anyone help me with the correct way to do something like this?

 

Thanks

Etienne Le Sueur