GKeyFile example.

key_file.c

#include <gtk/gtk.h>

int main(void)
{
    GKeyFile *key_file;
    GError *error;
    gsize length;
    
    gchar *str_value;
    gint int_value;
    gdouble double_value;
    
    key_file = g_key_file_new();
    error = NULL;
    
    guint group, key;
    
    if(!g_key_file_load_from_file(key_file,
                                  "test.ini",
                                  G_KEY_FILE_KEEP_COMMENTS | 
                                  G_KEY_FILE_KEEP_TRANSLATIONS,
                                  &error))
    {
        g_debug("%s", error->message);
    }
    else
    {
        str_value = g_key_file_get_string(key_file,
                                          "test",
                                          "str_value",
                                          &error);
        int_value = g_key_file_get_integer(key_file,
                                           "test",
                                           "int_value",
                                           &error);
        double_value = g_key_file_get_double(key_file,
                                             "test",
                                             "double_value",
                                             &error);
        
        g_debug("str: %s \nint: %d \ndouble: %f\n", 
                str_value, int_value, double_value);
        
        g_key_file_set_string(key_file, "test", "str_value", str_value);
        g_key_file_set_integer(key_file, "test", "int_value", int_value + 1);
        g_key_file_set_integer(key_file, "test", "double_value", double_value * 2);      
        
        g_debug("%s", g_key_file_to_data(key_file, &length, &error));
        
        
        gsize num_groups, num_keys;
        gchar **groups, **keys, *value;
        
        
        groups = g_key_file_get_groups(key_file, &num_groups);
        for(group = 0;group < num_groups;group++)
        {
            g_debug("group %u/%u: \t%s", group, num_groups - 1, groups[group]);
            
            
            keys = g_key_file_get_keys(key_file, groups[group], &num_keys, &error);
            for(key = 0;key < num_keys;key++)
            {
                value = g_key_file_get_value(key_file, 
                                             groups[group],
                                             keys[key],
                                             &error);
                g_debug("\t\tkey %u/%u: \t%s => %s", key, num_keys - 1, keys[key], value);
            }
        }
    }

    return 0;
}

Makefile

GTK_CFLAGS = $(shell pkg-config gtk+-2.0 --cflags)
GTK_LIBS = $(shell pkg-config gtk+-2.0 --libs)

all: key_file

key_file: key_file.o
	gcc -o key_file.exe key_file.o $(GTK_LIBS)

key_file.o: key_file.c
	gcc -c key_file.c -o key_file.o $(GTK_CFLAGS)

clean:
	rm -rf *o key_file
	rm -rf *exe key_file
    

test.ini

# test ini file

[test]
str_value=hello world
int_value=5
double_value=8.888765

[yoyo]
v1 = bla
v2=TRUE
v3=FALSE
test_var[bla]=yo
test_var[fla]=hoe
test_var[0]=s
test_var[1]=r