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fselect

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Purpose

Select the active input or output stream.

Synopsis

procedure fselect(stream:integer)

Argument

stream

The stream number

Example

The following saves the file ID of the default output before switching output to the file mylog.txt. Subsequently, the file ID of the current output stream is saved and the default output is again selected.

def_out:= getfid(F_OUTPUT)
fopen("mylog.txt", F_OUTPUT) 
  ...
my_out:= getfid(F_OUTPUT)
fselect(def_out)

Further information

This procedure selects the given stream as the active input or output stream. The concerned stream is designated by the opening status of the given stream (that is, if the given stream has been opened for reading, it will be assigned to the default input stream). The stream number can be obtained with the function getfid.

Related topics

fclose, fopen, getfid.

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