how to use (pulseaudio) system-libraries in a new QT Program

[Ebiko]

Okay,

So - Im pretty new here , as well as to programming in general,
but i've set myself an ambitious goal - and are now trying to reach it, eventually.
(even though this project of mine might take like centuries but , i'll still try it.)

What i'm trying to accomplish:

I want to write an c++ application which uses an system library to speak with an program / or daemon (PulseAudio to be exact here)

issue is - i have no clue on how to load this libraries.
i went through the Pulseaudio src , the additional programs like "paprefs" "pactl" "pacmd" and even oder programs based on the code of PulseAudio, "PavuControl" which is shipped in every Ubuntu nowadays to provide a GUI for Pulseaudio.
But i still cannot figure out how i can load the libs or talk to Pulseaudio otherwise.
Code Examples tend to be only the code examples , without loading the libs - so i cant learn it from there.

I want to write an Program , more or less like pavucontrol but with a different functionality.

But without access to the libraries , i dont even need to start coding.

yes , as i mentioned i am new , and this project may be a bit insane for my current knowledge. But I want to try to learn with something i wrote myself - probably the best way to learn it, instead of coding hello worlds (although they may be useful in certain circumstances)

Hope you can help me.
I'd really appreciate it.

Ebiko

[jsulm]

@Ebiko said in how to use (pulseaudio) system-libraries in a new QT Program:

i have no clue on how to load this libraries

Usually you do not load them (though this is also possible). Instead you link your application against these libraries.
See https://doc.qt.io/qtcreator/creator-project-qmake-libraries.html
And you should read on this topic in general.

[Ebiko]

Yeah , i have found this wizard already -

In this wizard i selected "Load System Library" and the hit browse , for the linux library , went to the lib folder where its supposed to be.
I searched the libpulse-simple.so.* (which definitely is in this folder , since i can find it with my usual file browser) but i could not find it in this folder , it just wasnt beeing shown.

Exempt from "ls -la /usr/lib/x86_64-linux-gnu/"

lrwxrwxrwx   1 root root       31 Aug 13 12:53 libpulse-mainloop-glib.so.0 -> libpulse-mainloop-glib.so.0.0.5
-rw-r--r--   1 root root    18576 Aug 13 12:53 libpulse-mainloop-glib.so.0.0.5
lrwxrwxrwx   1 root root       24 Aug 13 12:53 libpulse-simple.so.0 -> libpulse-simple.so.0.1.1
-rw-r--r--   1 root root    22760 Aug 13 12:53 libpulse-simple.so.0.1.1
lrwxrwxrwx   1 root root       18 Aug 13 12:53 libpulse.so.0 -> libpulse.so.0.21.2
-rw-r--r--   1 root root   343240 Aug 13 12:53 libpulse.so.0.21.2

[jsulm]

@Ebiko Don't know why these libs are not shown. But you can add them manually as shown in the link I posted:

LIBS += -lpulse

[Ebiko]

seems to be a good start - qt at least doesnt throw an error or warning of some kind - now i need to figure out where to get an .h file from to work with the lib
but thanks for your help - i didnt notice the "manual" way of adding the lib

[jsulm]

@Ebiko said in how to use (pulseaudio) system-libraries in a new QT Program:

where to get an .h file from to work with the lib
Install the pulse-dev package

[Ebiko]

@jsulm
thank you really much - now i can really start to learn/write :D