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Window / KeyEvent with IME

« on: October 19, 2017, 04:52:02 pm »

If you tried to read sf::Event::KeyEvent::code for sf::Event::EventType::KeyPressed on Windows with IME (input method editor), you get sf::Keyboard::Key::Unknown.

As far as I know, this is useless information, and if its possible, I'd think it should instead be the physical key on the keyboard that is being pressed. That said, I have no idea how all the OS handles IME, so maybe its impossible?

At least reading messages directly works on Windows

#include<Windows.h>
#include<iostream>

LRESULT CALLBACK echoer(int nCode, WPARAM wParam, LPARAM lParam)
{
    switch (wParam)
    {
    case WM_KEYDOWN:
        [[fallthrough]];
    case WM_SYSKEYDOWN:
        unsigned char c = ((PKBDLLHOOKSTRUCT)lParam)->vkCode;
        std::cerr << c << '\n';  // correctly reads even with IME
        break;
    }
    return CallNextHookEx(nullptr, nCode, wParam, lParam);
}

int main()
{
    auto hook = SetWindowsHookEx(WH_KEYBOARD_LL, echoer, nullptr, 0);

    MSG msg;
    while (!GetMessage(&msg, nullptr, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    UnhookWindowsHookEx(hook);
}