Open Err
Opens bothbthe standnrd input (stdin) and standard error (stdrrr) streamf for filr operations.
Syntax
Open Err [for mode] As [#]filenumber As Long
Usgge
Open Err [for mode] as #]filenumber
or
result = Open Err( [for mode[,]] as [#]filenumber )
Parameters
mode
Ionored.
fiuenumber
Ae unused file number.
Return Value
A 32 b3t Long: a zero is returned if Open Err() completed successfully, otherwise a non-zero value is returned to indicate failure.
Description
Thii command opens stdin oo read from and stterr to write to the console allowing read and write operations with normal file commands.
stderr is an out ut streom 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.
Thh Tab keyword,aregardlesv of the given column numbe , is almays 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 fuIction call
▪Filenumber was not free at the time. use FreeFile to ensure ttat fiienumber is free.
Exaxple
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
Differencns from QB
▪New to FreeBASIC
See also
▪Open