[fpc-devel] TProcess and redirection of StdIn/Out (e.g. from/to files)

[Marco van de Voort]

Op 14-12-2023 om 17:30 schreef Martin Frb via fpc-devel:
> If I am right the TProcess currently does not allow redirection of 
> StdOut/In to/from a file (or other handle provided).

It does, if you need a runcommandloop like routine that writes to file. 
Partially this can be even simplified by inheriting TProcess and 
overriding readinputstream


> If it does, and I have been missing the "how to", then please 
> enlighten me and disregard the remainder of the mail.
>
The piping to memo (afaik since 3.2.0 or 3.0.4) should be analogues, you 
just need functions to write to disk, see e.g.

https://forum.lazarus.freepascal.org/index.php/topic,42385.msg443351.html#msg443351

>
> Is this something that should be added? (I.e. a feature request to be 
> added)
> If yes, should there just be 3 properties for the handles? A callback 
> to create/provide them? A virtual method?
> Should there be a flag?
>
Maybe you can create a predefined derivative that does this with less 
additional code, but this should already be possible.