I am attempting to write a .NET textbox component that wraps a win32 console app. cmd, fsi, and some other tools are what I have in mind for this component.

I have found that the fsi compile error output does not get picked up. Here is a snippet of code:

private void cmdThread(object o) {
Process my_cmd = (Process)((List<object>)o)[0];
StreamReader stdout = my_cmd.StandardOutput;
string stdout_str;
StreamReader stderr = my_cmd.StandardOutput; // <-- BUG. This should have been my_cmd.StandardError
string stderr_str;

while (((stdout_str = stdout.ReadLine()) != null) && ((stderr_str = stderr.ReadLine()) != null)) {
lock (padlock) {
buffer += stdout_str + "\r\n";
buffer += stderr_str + "\r\n";
}
}
}

This code runs inside a thread. Periodically the UI thread reads from the variable "buffer" and writes it to the textbox. I'm grabbing text from stdout and stderr, so I'm not sure where else I could be looking.

Basically in Fsi.exe, if you type something wrong like let x =;; it will print an error in red line like :

> let x =;;

let x =;;
-------^^^

stdin(37,7): error FS0191: syntax error.
>
let x =;;
-------^^^

stdin(37,7): error FS0191: syntax error.
> >

Well I can't read those errors from stdout or stderr. What should I do?

-Puyan