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Translate virtual key and scan code to unicode character

tofiffe (139)
I'm trying to translate vkCode and scanCode from KBDLLHOOKSTRUCT to unicode characters, based on current keyboard:

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unsigned char btKeys[256] = {0};
if(!GetKeyboardState(btKeys)) {
    printf("Error: %ld\n", GetLastError());
}

HKL keyboardLayout = GetKeyboardLayout(0);

wchar_t szBuffer[2] = {0};
if (ToUnicodeEx(vkCode, scanCode, btKeys, szBuffer, 2, 0, keyboardLayout)) {
    if (iswcntrl(szBuffer[0])) {
        sendControl(szBuffer[0]);
        return;
    }
    sendUnicode(szBuffer[0]);
};


However that only returns alphanumeric characters, as if no modifiers (shift, control, alt) were pressed. How can I fix that?
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