keyboard_mode

windows/runner/keyboard_mode.cpp

#include <windows.h>
#include <iostream>

extern "C" __declspec(dllexport) void SetKeyboardToEnglish() {
    // Load the English (United States) keyboard layout
    HKL hkl = LoadKeyboardLayout(TEXT("00000409"), KLF_ACTIVATE); // English (United States) layout
    if (hkl == NULL) {
        std::cerr << "Failed to load keyboard layout" << std::endl;
        return;
    }

    // Activate the layout
    if (!ActivateKeyboardLayout(hkl, KLF_SETFORPROCESS)) {
        std::cerr << "Failed to activate keyboard layout" << std::endl;
    }
}

extern "C" __declspec(dllexport) void SetKeyboardToHalfWidthAlphanumeric() {
    // Load the Japanese keyboard layout with half-width alphanumeric mode
    HKL hkl = LoadKeyboardLayout(TEXT("00000411"), KLF_ACTIVATE); // Japanese IME
    if (hkl == NULL) {
        std::cerr << "Failed to load keyboard layout" << std::endl;
        return;
    }

    // Activate the layout
    if (!ActivateKeyboardLayout(hkl, KLF_SETFORPROCESS)) {
        std::cerr << "Failed to activate keyboard layout" << std::endl;
        return;
    }

    // Simulate the Alt + 半角/全角 key press to switch to half-width alphanumeric
    INPUT inputs[4] = {};

    // Press Alt
    inputs[0].type = INPUT_KEYBOARD;
    inputs[0].ki.wVk = VK_MENU;

    // Press 半角/全角 (VK_KANA)
    inputs[1].type = INPUT_KEYBOARD;
    inputs[1].ki.wVk = VK_KANA;

    // Release 半角/全角 (VK_KANA)
    inputs[2].type = INPUT_KEYBOARD;
    inputs[2].ki.wVk = VK_KANA;
    inputs[2].ki.dwFlags = KEYEVENTF_KEYUP;

    // Release Alt
    inputs[3].type = INPUT_KEYBOARD;
    inputs[3].ki.wVk = VK_MENU;
    inputs[3].ki.dwFlags = KEYEVENTF_KEYUP;

    // Send the key events
    if (SendInput(ARRAYSIZE(inputs), inputs, sizeof(INPUT)) == 0) {
        std::cerr << "Failed to send input" << std::endl;
    }
}

KeyboardMode クラス

import 'dart:ffi';
import 'dart:io';

typedef SetKeyboardToEnglishFunc = Void Function();
typedef SetKeyboardToHalfWidthAlphanumericFunc = Void Function();

class KeyboardMode {
  final DynamicLibrary _nativeLib;

  KeyboardMode() : _nativeLib = Platform.isWindows
      ? DynamicLibrary.open('keyboard_mode.dll')
      : throw UnsupportedError('This platform is not supported') {
    _setKeyboardToEnglish = _nativeLib
        .lookup<NativeFunction<SetKeyboardToEnglishFunc>>('SetKeyboardToEnglish')
        .asFunction();
    _setKeyboardToHalfWidthAlphanumeric = _nativeLib
        .lookup<NativeFunction<SetKeyboardToHalfWidthAlphanumericFunc>>('SetKeyboardToHalfWidthAlphanumeric')
        .asFunction();
  }

  late final void Function() _setKeyboardToEnglish;
  late final void Function() _setKeyboardToHalfWidthAlphanumeric;

  void setKeyboardToEnglish() => _setKeyboardToEnglish();
  void setKeyboardToHalfWidthAlphanumeric() => _setKeyboardToHalfWidthAlphanumeric();
}

windows/runner/CMakeLists.txt

  "win32_window.cpp"
  "${FLUTTER_MANAGED_DIR}/generated_plugin_registrant.cc"
  "Runner.rc"
  "runner.exe.manifest"
)

# ここを追加
# Define the DLL
set(PLUGIN_NAME "keyboard_mode")
add_library(${PLUGIN_NAME} SHARED "keyboard_mode.cpp")
# Define the libraries to link to.
#target_link_libraries(runner PRIVATE flutter keyboard_hook)
apply_standard_settings(${PLUGIN_NAME})

# Apply the standard set of build settings. This can be removed for applications
# that need different build settings.
apply_standard_settings(${BINARY_NAME})

# ここまで