int localeId = GetKeyboardLayout(0);

// The low word contains a Language Identifier for the input language
// and the high word contains a device handle to the physical layout
// of the keyboard.
localeId &= 0xffff;    // mask off high word to get the locale
                       // identifier

switch (localeId) {
    0x040c:
    0x080c:
    0x1009:
        useAzertyMapping();
    default:
        useQwertyMapping();
}