Open Err [for mode] As [#]filenum As Long

Open Err [for mode] as [#]filenum

or

result = Open Err( [for mode[,]] as [#]filenum )

mode
filenum

Zero is returned if Open Err completed successfully, otherwise a non-zero value is returned to indicate failure.

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

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.
  
  

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

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