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Node.jsでWindowsのキー状態を取得する

More than 3 years have passed since last update.

document.addEventListener('keydown')のようにアプリケーションにフォーカスがある時にキー入力を検知するのではなく、バックグラウンドで起動している状態でOSのキー入力状態を取得します。いわゆるキーロガーみたいなことができます。

var FFI = require('ffi');

var user32 = new FFI.Library('user32', {
  'GetAsyncKeyState': [
    'int32', ['int32']
  ]
});

setInterval(function() {

  for (var i = 0; i < 255; ++i) {
    var state = user32.GetAsyncKeyState(i);
    if ( state == -32767) {
      // i = 押されたキーコード
      console.log(i);
    }
  }

}, 10);
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