はじめに
グローバルキーフックのためのクラスを作成したので、忘備録として残しておきます。
インスタンスを生成し「KeyBoardHook」を呼び出してから「KeyBoardUnHook」を呼び出すまでグローバルキーフックの検出を行います。
グローバルキーフックを検出した後、独自イベント「KeyHookDownEvent」（キー押下時）と「KeyHookUpEvent」（キー離上時）にイベントを発生させます。
コード
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
/// <summary>
/// グローバルキーフックイベントを実装するクラス
/// </summary>
public class Common_KeyBoardHook
{
#region Const
private protected const int WH_KEYBOARD_LL = 0x000D;
private protected const int HC_ACTION = 0;
private protected const int WM_KEYDOWN = 0x0100;
private protected const int WM_KEYUP = 0x0101;
private protected const int WM_SYSKEYDOWN = 0x0104;
private protected const int WM_SYSKEYUP = 0x0105;
[Flags]
private enum KBDLLHOOKSTRUCTFlags : uint
{
LLKHF_EXTENDED = 0x01,
LLKHF_INJECTED = 0x10,
LLKHF_ALTDOWN = 0x20,
LLKHF_UP = 0x80
}
[StructLayout(LayoutKind.Sequential)]
private class KBDLLHOOKSTRUCT
{
public uint vkCode;
public uint scanCode;
public KBDLLHOOKSTRUCTFlags flags;
public uint time;
public UIntPtr dwExtraInfo;
}
public enum HookKeyCode : int
{
VK_LBUTTON = 0x01, VK_RBUTTON, VK_CANCEL, VK_MBUTTON, VK_XBUTTON1, VK_XBUTTON2,
VK_BACK = 0x08, VK_TAB,
VK_CLEAR = 0x0C, VK_RETURN,
VK_SHIFT = 0x10, VK_CONTROL, VK_MENU, VK_PAUSE, VK_CAPITAL, VK_KANA,
VK_JUNJA = 0x17, VK_FINAL, VK_KANJI,
VK_ESCAPE = 0x1B, VK_CONVERT, VK_NONCONVERT, VK_ACCEPT, VK_MODECHANGE,
VK_SPACE, VK_PRIOR, VK_NEXT, VK_END, VK_HOME, VK_LEFT, VK_UP, VK_RIGHT, VK_DOWN,
VK_SELECT, VK_PRINT, VK_EXECUTE, VK_SNAPSHOT, VK_INSERT, VK_DELETE, VK_HELP,
VK_0, VK_1, VK_2, VK_3, VK_4, VK_5, VK_6, VK_7, VK_8, VK_9,
VK_A = 0x41, VK_B, VK_C, VK_D, VK_E, VK_F, VK_G, VK_H,
VK_I, VK_J, VK_K, VK_L, VK_M, VK_N, VK_O, VK_P, VK_Q,
VK_R, VK_S, VK_T, VK_U, VK_V, VK_W, VK_X, VK_Y, VK_Z,
VK_LWIN, VK_RWIN, VK_APPS,
VK_SLEEP = 0x5F, VK_NUMPAD0, VK_NUMPAD1, VK_NUMPAD2, VK_NUMPAD3, VK_NUMPAD4,
VK_NUMPAD5, VK_NUMPAD6, VK_NUMPAD7, VK_NUMPAD8, VK_NUMPAD9,
VK_MULTIPLY, VK_ADD, VK_SEPARATOR, VK_SUBTRACT, VK_DECIMAL, VK_DIVIDE,
VK_F1, VK_F2, VK_F3, VK_F4, VK_F5, VK_F6, VK_F7, VK_F8,
VK_F9, VK_F10, VK_F11, VK_F12, VK_F13, VK_F14, VK_F15, VK_F16,
VK_F17, VK_F18, VK_F19, VK_F20, VK_F21, VK_F22, VK_F23, VK_F24,
VK_NUMLOCK = 0x90, VK_SCROLL,
VK_LSHIFT = 0xA0, VK_RSHIFT, VK_LCONTROL, VK_RCONTROL, VK_LMENU, VK_RMENU,
VK_BROWSER_BACK, VK_BROWSER_FORWARD, VK_BROWSER_REFRESH, VK_BROWSER_STOP,
VK_BROWSER_SEARCH, VK_BROWSER_FAVORITES, VK_BROWSER_HOME,
VK_VOLUME_MUTE, VK_VOLUME_DOWN, VK_VOLUME_UP,
VK_MEDIA_NEXT_TRACK, VK_MEDIA_PREV_TRACK, VK_MEDIA_STOP, VK_MEDIA_PLAY_PAUSE,
VK_LAUNCH_MAIL, VK_LAUNCH_MEDIA_SELECT, VK_LAUNCH_APP1, VK_LAUNCH_APP2,
VK_OEM_1 = 0xBA, VK_OEM_PLUS, VK_OEM_COMMA, VK_OEM_MINUS, VK_OEM_PERIOD, VK_OEM_2, VK_OEM_3,
VK_OEM_4 = 0xDB, VK_OEM_5, VK_OEM_6, VK_OEM_7, VK_OEM_8,
VK_OEM_102 = 0xE2,
VK_PROCESSKEY = 0xE5,
VK_PACKET = 0xE7,
VK_ATTN = 0xF6, VK_CRSEL, VK_EXSEL, VK_EREOF,
VK_PLAY, VK_ZOOM, VK_NONAME, VK_PA1, VK_OEM_CLEAR
}
#endregion
#region Private
private delegate IntPtr KeyBoardHookProc(int nCode, IntPtr wParam, IntPtr lParam);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr SetWindowsHookEx(int idHook, KeyBoardHookProc lpfn, IntPtr hMod, uint dwThreadId);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool UnhookWindowsHookEx(IntPtr hhk);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam);
[DllImport("kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
private static extern IntPtr GetModuleHandle(string lpModuleName);
private IntPtr HookPtr = IntPtr.Zero;
private KeyBoardHookProc? HookProc;
private protected void OnKeyHookDownEvent(int KeyCode)
{
KeyHookDownEvent?.Invoke(this, new(KeyCode));
}
private protected void OnKeyHookUpEvent(int KeyCode)
{
KeyHookUpEvent?.Invoke(this, new(KeyCode));
}
private IntPtr HookCallBack(int nCode, IntPtr wParam, IntPtr lParam)
{
IntPtr NextHookPtr = CallNextHookEx(HookPtr, nCode, wParam, lParam);
//例外処理
if (nCode < HC_ACTION)
{
return NextHookPtr;
}
//キーコードの取得
object? PtrStructure = Marshal.PtrToStructure(lParam, typeof(KBDLLHOOKSTRUCT));
if (PtrStructure == null)
{
return NextHookPtr;
}
KBDLLHOOKSTRUCT KeyHookStruct = (KBDLLHOOKSTRUCT)PtrStructure;
int KeyCode = (int)KeyHookStruct.vkCode;
//キーダウンイベント
if (wParam == (IntPtr)WM_KEYDOWN || wParam == (IntPtr)WM_SYSKEYDOWN)
{
OnKeyHookDownEvent(KeyCode);
}
//キーアップイベント
else if (wParam == (IntPtr)WM_KEYUP || wParam == (IntPtr)WM_SYSKEYUP)
{
OnKeyHookUpEvent(KeyCode);
}
return NextHookPtr;
}
#endregion
#region Public
/// <summary>
/// キーボードフックを設定する
/// </summary>
/// <returns>設定の是非(T/F)</returns>
public bool KeyBoardHook()
{
Process CurrentProcess = Process.GetCurrentProcess();
ProcessModule? CurrentModule = CurrentProcess.MainModule;
if (CurrentModule == null)
{
return false;
}
string? NameModule = CurrentModule.ModuleName;
if (NameModule == null)
{
return false;
}
HookProc = HookCallBack;
HookPtr = SetWindowsHookEx(WH_KEYBOARD_LL, HookProc, GetModuleHandle(NameModule), 0);
return true;
}
/// <summary>
/// キーボードフックを解除する
/// </summary>
/// <returns>解除の是非</returns>
public bool KeyBoardUnHook()
{
bool RetUnhook = UnhookWindowsHookEx(HookPtr);
HookPtr = IntPtr.Zero;
return RetUnhook;
}
/// <summary>
/// キーボードフックイベント
/// </summary>
/// <param name="sender">KBDLLHOOKSTRUCT構造へのポインタ</param>
/// <param name="e">キーフックイベント</param>
public delegate void KeyHookEventHandler(object sender, KeyHookEventArgs e);
public event KeyHookEventHandler? KeyHookDownEvent;
public event KeyHookEventHandler? KeyHookUpEvent;
#endregion
}
/// <summary>
/// キーフックイベント
/// </summary>
public class KeyHookEventArgs : EventArgs
{
public int KeyCode { get; }
public KeyHookEventArgs(int InputKeyCode)
{
KeyCode = InputKeyCode;
}
}
使い方
参考程度に。
//WPF OnStartUp等の開始処理内に記載 KeyBoardHook.KeyHookDownEvent += KeyHookDown; KeyBoardHook.KeyHookUpEvent += KeyHookUp; _ = KeyBoardHook.KeyBoardHook();
void KeyHookDown(object sender, KeyHookEventArgs e){//キー押下時の処理}
void KeyHookUp(object sender, KeyHookEventArgs e){//キー離上時の処理}
//WPF OnExit等の終了処理内に記載 _ = KeyBoardHook.KeyBoardUnHook();
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