Hi Marc,

It works fine now.
Thank you very much.

Regards,
Dan.

-----Original Message-----
From: Marc Feeley [mailto:feeley@IRO.UMontreal.CA]
Sent: Saturday, March 19, 2005 9:05 AM
To: dhristodorescu@borderfree.com
Cc: gambit-list@IRO.UMontreal.CA
Subject: Re: [gambit-list] Calling from C on Windows

I fixed the bug.  You need to change the USE_WIN32 section in
___os_device_stream_open_predefined to this:

  switch (___INT(index))
    {
    case -4:
    open_console:
      {
        ___device_tty *d;

        if ((e = ___device_tty_setup_console
                   (&d,
                    io_mod.dgroup,
                    direction))
            != ___FIX(___NO_ERR))
          return e;

        dev = ___CAST(___device_stream*,d);

        break;
      }

    default:
      {
        switch (___INT(index))
          {
          default:
          case -1:
            h = GetStdHandle (STD_INPUT_HANDLE);
            break;
          case -2:
            h = GetStdHandle (STD_OUTPUT_HANDLE);
            break;
          case -3:
            h = GetStdHandle (STD_ERROR_HANDLE);
            break;
          }

        if (h == INVALID_HANDLE_VALUE)
          return err_code_from_GetLastError ();

        if (GetFileType (h) == FILE_TYPE_UNKNOWN)
          goto open_console;

...

The bug occurs on Windows when the Gambit runtime is being run as a
windowed application (no problem in console applications).  In a
windowed application the GetStdHandle calls (which are meant to return
the standard input/output/error) return a handle whose type is not
recognized by Gambit (it is not a file, a pipe, a socket, a console,
or a serial port).  This caused the runtime to terminate.  The fix
adds a check for the handle type and associates a console window to
stdin/out/err if their type is unknown.  So for windowed applications
any "standard I/O" from Scheme will go to a freshly created console
(unless stdin/out/err were redirected).

Marc