Anyone has any experiences with Glib?

[wasab]

Long story short, I am trying to make a gnome notification service. I plan to daemonize it and have it push notifications to the gnome notification tray whenever chat server(which i am also gonna make one from scratch) send out a message. It will be more or less a notification service that runs in the background and pushes messages to the gnome notification tray. 

 

For this, I am using the gnome Glib library, Clion, and developing on fedora 30. 

My major issue is that the compiler keep on throwing me linkage error. It doesnt seem to be able to find the dependency it needs(Glib). I tried both cmake and using the gcc terminal commands, no luck. Can anyone help me out? 

 

My main.c (this is a test code) 

#include <stdio.h>
#include <gio/gio.h>
int main() {
    GApplication* application = g_application_new ("Test", G_APPLICATION_FLAGS_NONE);
    GNotification* notification = g_notification_new("Test Title");
    g_notification_set_body(notification, "Test body");
    g_notification_set_priority(notification, G_NOTIFICATION_PRIORITY_NORMAL);
    g_application_send_notification(application, "Test Id", notification);
    return 0;
}

 

My cmake file 

cmake_minimum_required(VERSION 3.14)
project(gnome_notification C)

set(CMAKE_C_STANDARD 99)

find_package(PkgConfig REQUIRED)
pkg_check_modules(GLIB glib-2.0 REQUIRED)
include_directories(${GLIB_INCLUDE_DIRS})



set(SOURCE_FILES main.c)
add_executable(${PROJECT_NAME} ${SOURCE_FILES})
target_link_libraries(${PROJECT_NAME} ${GLIB_LIBRARIES})

 

 

What the error looks like. As you can see, undefined referenced.

 

 

 

It is confirmed I already have glib installed. 

 

 

Can someone help me out? 

 

I follow the guide on here. 

https://wiki.gnome.org/HowDoI/GNotification

[colonel_mortis]

I think your problem is that you're depending on glib rather than gio. It compiles and links correctly for me (on Fedora 29) with

gcc main.c `pkg-config --libs --cflags gio-2.0`

I've not used any of these libraries before, I was just curious and looked into it enough to get this to work, so I won't necessarily be able to help with any other issues.

The program doesn't actually run at the moment though, because the application ID needs to match a certain format and the application then needs to be registered.

[wasab]

1 hour ago, colonel_mortis said:

I think your problem is that you're depending on glib rather than gio. It compiles and links correctly for me (on Fedora 29) with

gcc main.c `pkg-config --libs --cflags gio-2.0`

I've not used any of these libraries before, I was just curious and looked into it enough to get this to work, so I won't necessarily be able to help with any other issues.

The program doesn't actually run at the moment though, because the application ID needs to match a certain format and the application then needs to be registered.

I see. I will try it out. I thought gio is part of the glib. 

[wasab]

@colonel_mortis

 

No luck. pkgconfig cant even finds the package this time around. I really do not understand why including a library in C is so difficult.  

 

 

[colonel_mortis]

1 minute ago, wasab said:

@colonel_mortis

 

No luck. pkgconfig cant even finds the package this time around. I really do not understand why including a library in C is so difficult.  

 

 

The argument to pkg-config should be gio-2.0 not glib-2.0, or at least using gio was what made it compile correctly for me.

[wasab]

10 minutes ago, colonel_mortis said:

The argument to pkg-config should be gio-2.0 not glib-2.0, or at least using gio was what made it compile correctly for me.

I tried both glib and gio 

 

 

What packages did you install on Fedora to have gio? I got gio.h in my usr/include/ by installing the glib2-devel package. Maybe I installed the wrong package. 

[wasab]

https://askubuntu.com/questions/703611/how-to-call-desktop-notifications-on-ubuntu-gnome

 

I found an alternative. Looks like I do not need to do this programmatically. I can just run a shell command.

[DevBlox]

gcc main.c -o main `pkg-config --libs --cflags gio-2.0`

I've got an identical setup and worked for me. I don't recall installing any specific library in the past. Could be bundled with glib. Since you got the headers and you still get pkg-config errors, try finding the gio-2.0.pc or similar. It should be in /usr/lib(64)/pkgconfig/. If it's there, you might want to check what pkg-config search paths are. Maybe something is misconfigured somehow.

[wasab]

 

 

1

Just now, DevBlox said:

gcc main.c -o main `pkg-config --libs --cflags gio-2.0`

I've got an identical setup and worked for me. I don't recall installing any specific library in the past. Could be bundled with glib. Since you got the headers and you still get pkg-config errors, try finding the gio-2.0.pc or similar. It should be in /usr/lib(64)/pkgconfig/. If it's there, you might want to check what pkg-config search paths are. Maybe something is misconfigured somehow.

yes, i found gio-2.0.pc inside /usr/lib64/pkgconfig/

 

PKG_CONFIG_PATH variable is empty when I initially printed it out. Something is indeed terribly misconfigured. I exported the correct directory to the environment variable, it throws me the same error nevertheless. Not sure why. I think i will just use shell command for the notification or use python and the notify2 module.