Stream input and output (at the same time)

[RobertKipling]

Long story short, I'm trying to write an advanced command prompt. Some of the programs will be launched from the GUI I created (which resembles the DOS prompt), and some of them will be user-interactive, with their output streamed into a text box and the input taken from either the keyboard or another text box below it.

The problem is, when I got the program to interact, output-only functions like "dir" worked perfectly, but other ones, like "prompt" which required input, would freeze the program and really mess up the processor. Any suggestions?

$foo = Run(@ComSpec & " /c " & $data, $currentdir, @SW_HIDE, $STDIN_CHILD + $STDOUT_CHILD)      
        do 
        ;; run
            While 1
                $line = StdoutRead($foo)
                If @error Then ExitLoop
                if $line <> "" Then GUICtrlSetData($txtMain, $line, "add")
            ;MsgBox(0, "STDOUT read:", $line)
            Wend
            if not WinExists($foo) then ExitLoop
            do 
                $msg = GUIGetMsg()
            until $msg = $button1
            MsgBox(0,"","Writing OUT")
            StdinWrite($foo, GUICtrlRead($txtPrompt)& @CRLF)
            StdinWrite($foo)
        until not WinExists($foo)

[martin]

Can you show some code we can run to see the problem?

[RobertKipling]

Here's the source code for the project; sorry I didn't include it earlier but it's a lot of content.

prompt.zip