Open Err

Opens both the standard input (stdin) and standard error (stderr) streams 
for file operations.

Syntax
   Open Err [for mode] As [#]filenumber As Long

Usage
   Open Err [for mode] as [#]filenumber
      or
   result = Open Err( [for mode[,]] as [#]filenumber )

Parameters
   mode
      Ignored.
   filenumber
      An unused file number.

Return Value
   A 32 bit Long: a zero is returned if Open Err() completed successfully, 
   otherwise a non-zero value is returned to indicate failure.

Description
   This command opens stdin to read from and stderr to write to the console 
   allowing read and write operations with normal file commands.

   stderr is an output stream different from stdout allowing error messages 
   to be redirected separately from the main console output.

   The normal console commands, such as Color and Locate, do not work in 
   this mode, because they do not accept a file number.
   The Tab keyword, regardless of the given column number, is always 
   interpreted as a simple comma (,) (next output will take place at the 
   next 14 column boundary).

   The [For Input|Output] mode is allowed for compatibility, but is 
   ignored.

   The error code returned by Open Err can be checked using Err in the next 
   line. The function version of  Open Err returns directly the error code 
   as a 32 bit Long.

Runtime errors:
   Open Err throws one of the following runtime errors:

   (1) Illegal function call
      * Filenumber was not free at the time. use FreeFile to ensure that 
        filenumber is free.

Example
   Dim a As String
   Open Err For Input  As #1
   Print #1,"Please write something and press ENTER"
   Line Input #1, a 
   Print #1, "You wrote"; a
   Close
   Sleep

Differences from QB
   * New to FreeBASIC

See also
   * Open

