Looks whether the key file has the key @key in the group
@group_name.
Note that this function does not follow the rules for #GError strictly;
the return value both carries meaning and signals an error. To use
this function, you must pass a #GError pointer in @error, and check
whether it is not %NULL to see if an error occurred.
Language bindings should use g_key_file_get_value() to test whether
or not a key exists.
Looks whether the key file has the key @key in the group @group_name.
Note that this function does not follow the rules for #GError strictly; the return value both carries meaning and signals an error. To use this function, you must pass a #GError pointer in @error, and check whether it is not %NULL to see if an error occurred.
Language bindings should use g_key_file_get_value() to test whether or not a key exists.