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[Solved] Process pipe error
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Topic: [Solved] Process pipe error (Read 742 times)
nikel
Full Member
Posts: 186
[Solved] Process pipe error
«
on:
September 22, 2020, 03:16:30 pm »
Hello, I'm trying to get some tags from mp3's, here's my code:
Code: Pascal
[Select]
[+]
[-]
Path
:
=
P
;
TempStringlist
:
=
TStringList
.
Create
;
AProcess
:
=
TProcess
.
Create
(
nil
)
;
AProcess
.
Executable
:
=
'/bin/sh'
;
// /bin/bash
AProcess
.
Parameters
.
Add
(
'-c'
)
;
AProcess
.
Parameters
.
Add
(
'ffprobe -loglevel error -show_entries format_tags='
+
Request
+
' -of default=noprint_wrappers=1:nokey=1 '
+
Path
)
;
AProcess
.
Options
:
=
AProcess
.
Options
+
[
poWaitOnExit
,
poUsePipes
]
;
AProcess
.
Execute
;
I'm getting pipe error on some songs. Why does it happen?
«
Last Edit: September 22, 2020, 05:15:36 pm by nikel
»
Logged
winni
Hero Member
Posts: 3197
Re: Process pipe error
«
Reply #1 on:
September 22, 2020, 03:38:19 pm »
Hi!
I have just no Lazarus at hand.
But as I remember the size of the pipe is 1024 bytes.
Do some tags break this limit?
Winni
Logged
marcov
Administrator
Hero Member
Posts: 11459
FPC developer.
Re: Process pipe error
«
Reply #2 on:
September 22, 2020, 03:40:30 pm »
Do you implement the so called long output scenario? This is always recommended when there are problems.
Or use runcommand, which implements this scenario.
Logged
nikel
Full Member
Posts: 186
Re: Process pipe error
«
Reply #3 on:
September 22, 2020, 04:55:58 pm »
Thanks for the replies. How can I implement scenario, it's a console application.
Logged
marcov
Administrator
Hero Member
Posts: 11459
FPC developer.
Re: Process pipe error
«
Reply #4 on:
September 22, 2020, 04:57:46 pm »
https://wiki.freepascal.org/Executing_External_Programs#Reading_large_output
or easier
https://wiki.freepascal.org/Executing_External_Programs#.28Process..29RunCommand
Logged
nikel
Full Member
Posts: 186
Re: Process pipe error
«
Reply #5 on:
September 22, 2020, 05:15:19 pm »
This worked fine
Code: Pascal
[Select]
[+]
[-]
Path
:
=
P
;
if
RunCommand
(
'/bin/bash'
,
[
'-c'
,
'ffprobe -loglevel error -show_entries format_tags='
+
Request
+
' -of default=noprint_wrappers=1:nokey=1 '
+
'"'
+
Path
+
'"'
]
,
Str
)
then
writeln
(
Str
)
;
Result
:
=
Str
;
Logged
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