Lookup an icon by name and size

CMakeLists.txt

cmake_minimum_required(VERSION 2.8.9)
project(gtktest LANGUAGES C)

find_package(PkgConfig REQUIRED)
pkg_check_modules(GTK3 REQUIRED gtk+-3.0)

include_directories(${GTK3_INCLUDE_DIRS})
add_executable(gtktest main.c)
target_link_libraries(gtktest ${GTK3_LIBRARIES})

main.c

#include <gtk/gtk.h>
#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[]) {

    GtkIconTheme *theme;

    // Initialize GTK+
    gtk_init(&argc, &argv);

    // Load the default icon theme
    theme = gtk_icon_theme_get_default();

    if (!theme) {
        printf("Unable to load default icon theme.\n");
        exit(1);
    }

    // Enter a loop that prompts for an icon name and desired size
    // The path of the closest matching icon is then displayed
    do {

        char name[40];
        int size;
        GtkIconInfo *info;

        printf("Enter an icon name: ");
        scanf("%39s", name);

        printf("Enter the desired size: ");
        scanf("%d", &size);

        info = gtk_icon_theme_lookup_icon(
            theme,
            name,
            size,
            0
        );

        if (info) {

            const gchar *filename = gtk_icon_info_get_filename(info);

            if (filename) {
                printf("Filename: %s\n", filename);
            } else {
                printf("Icon found but no filename.\n");
            }

            g_object_unref(info);

        } else {
            printf("Unable to find icon.\n");
        }
    } while(1);
}