Function check_version 

pub fn check_version(
    required_major: u32,
    required_minor: u32,
    required_micro: u32,
) -> Option<GString>

t completely reliable, since the module may be linked against an old version of GTK and calling the old version of gtk_check_version(), but still get loaded into an application using a newer version of GTK.

required_major

the required major version

required_minor

the required minor version

required_micro

the required micro version

Returns

None if the GTK library is compatible with the given version, or a string describing the version mismatch. The returned string is owned by GTK and should not be modified or freed.