[Gambas-user] PIPE issues

[Benoît Minisini]

> > 
> > This is a pipe. Data is available only when it has been filled by the
> > other side. So Eof() can returns true at anytime, even if some data may
> > be written in the future. Gambas cannot read the future yet.
> 
> Benoit, i got this example from the wiki.
> http://gambasdoc.org/help/lang/pipe?v3

Then the example is wrong. I don't think I wrote it anyway.

> 
> > > if i change to
> > > WHILE TRUE
> > > 
> > > i get the ls results to console and
> > > i get an error
> > > 
> > > System error. Inappropriate ioctl for device.
> > 
> > The error message is not very accurate. But it is normal, as reading on a
> > pipe that has been closed on the other side is impossible.
> > 
> > Regards,
> 
> What is the right code to read a pipe if it is not with Eof() or WHILE
> TRUE ?
> 
> 
> Thanks Benoit for your answer.

In Gambas 2, you must do something like that:

  DIM hFile AS File
  DIM sLine AS String
  
  hFile = PIPE "/tmp/FIFO1" FOR READ
  
  DO
    TRY READ #hFile, sLine, -256
    IF NOT sLine THEN BREAK
    PRINT sLine;
  LOOP

In Gambas 3, you can do that too:

  Dim hFile As File
  Dim sLine As String
  
  hFile = Pipe "/tmp/FIFO1" For Read
  
  Do
    Line Input #hFile, sLine
    If hFile.EndOfFile Then Break
    Print sLine
  Loop

Regards,

-- 
Benoît Minisini