C # 애플리케이션에서 전역 키보드 캡처

81

내 애플리케이션에서 바로 가기 키를 캡처하고 사용자가 앱 외부에서도 키보드 콤보를 누르면 나타나는 대화 상자를 트리거하고 싶습니다. Google 데스크톱 검색의 Ctrl, Ctrl과 유사하여 검색 대화 상자를 표시합니다.

이 효과를 얻기 위해 기본적으로 Win32 interop을 사용하는 키보드 후크 모듈을 사용해 보았지만 각 구현은 응용 프로그램이 집중적 인 작업을 수행 할 때 이상한 동작을 시작하는 위치에 어느 정도 키보드를 연결하려고 시도했습니다. 많은 양의 데이터를로드하는 것과 같이 이로 인해 키보드와 마우스가 잠기 게됩니다.

저는 키보드와 마우스를 묶지 않고도이 작업을 수행 할 수있는 경량 솔루션을 찾고 있습니다.

.net  events  keyboard-hook 
— 제레미 에드워즈
소스
이미 시도한 모듈을 지정할 수 있습니다.
— Stormenet
— Ohad Schneider

답변:

96

Stephen Toub 는 C #에서 전역 키보드 후크 구현에 대한 훌륭한 기사 를 작성했습니다 .

using System;
using System.Diagnostics;
using System.Windows.Forms;
using System.Runtime.InteropServices;

class InterceptKeys
{
    private const int WH_KEYBOARD_LL = 13;
    private const int WM_KEYDOWN = 0x0100;
    private static LowLevelKeyboardProc _proc = HookCallback;
    private static IntPtr _hookID = IntPtr.Zero;

    public static void Main()
    {
        _hookID = SetHook(_proc);
        Application.Run();
        UnhookWindowsHookEx(_hookID);
    }

    private static IntPtr SetHook(LowLevelKeyboardProc proc)
    {
        using (Process curProcess = Process.GetCurrentProcess())
        using (ProcessModule curModule = curProcess.MainModule)
        {
            return SetWindowsHookEx(WH_KEYBOARD_LL, proc,
                GetModuleHandle(curModule.ModuleName), 0);
        }
    }

    private delegate IntPtr LowLevelKeyboardProc(
        int nCode, IntPtr wParam, IntPtr lParam);

    private static IntPtr HookCallback(
        int nCode, IntPtr wParam, IntPtr lParam)
    {
        if (nCode >= 0 && wParam == (IntPtr)WM_KEYDOWN)
        {
            int vkCode = Marshal.ReadInt32(lParam);
            Console.WriteLine((Keys)vkCode);
        }
        return CallNextHookEx(_hookID, nCode, wParam, lParam);
    }

    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    private static extern IntPtr SetWindowsHookEx(int idHook,
        LowLevelKeyboardProc 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.Auto, SetLastError = true)]
    private static extern IntPtr GetModuleHandle(string lpModuleName);
}
— 존 T
소스
16
이 수업을 어떻게 사용할 수 있습니까?
— VAAA
1
이것이 이상한 문자를 반환하는 이유는 무엇입니까?
— Blue Eyed Behemoth
@VAAA 솔루션에 클래스를 추가하십시오. Program.cs에 이미 main ()이있는 경우이 클래스의 main () 이름을 InitializeComponent ()로 바꾼 다음 프로젝트 App () 메서드에서 호출합니다. SysTrayApp (). Stephen이 답변 한 더 많은 Q & A는 링크 된 기사 댓글을 참조하십시오.
— JE Carter II
이렇게하면 "S"와 같이 눌러 진 원시 키가 제공되지만 삽입 될 키를 결정할 수있는 방법이 있습니다. 예를 들어 Caps Lock이 꺼져 있으면 "s", 켜져 있으면 "S"가됩니다. ?
— Jez
46

작동하는 내 코드는 다음과 같습니다.

using System;
using System.ComponentModel;
using System.Diagnostics;
using System.Runtime.InteropServices;

namespace SnagFree.TrayApp.Core
{
    class GlobalKeyboardHookEventArgs : HandledEventArgs
    {
        public GlobalKeyboardHook.KeyboardState KeyboardState { get; private set; }
        public GlobalKeyboardHook.LowLevelKeyboardInputEvent KeyboardData { get; private set; }

        public GlobalKeyboardHookEventArgs(
            GlobalKeyboardHook.LowLevelKeyboardInputEvent keyboardData,
            GlobalKeyboardHook.KeyboardState keyboardState)
        {
            KeyboardData = keyboardData;
            KeyboardState = keyboardState;
        }
    }

    //Based on https://gist.github.com/Stasonix
    class GlobalKeyboardHook : IDisposable
    {
        public event EventHandler<GlobalKeyboardHookEventArgs> KeyboardPressed;

        public GlobalKeyboardHook()
        {
            _windowsHookHandle = IntPtr.Zero;
            _user32LibraryHandle = IntPtr.Zero;
            _hookProc = LowLevelKeyboardProc; // we must keep alive _hookProc, because GC is not aware about SetWindowsHookEx behaviour.

            _user32LibraryHandle = LoadLibrary("User32");
            if (_user32LibraryHandle == IntPtr.Zero)
            {
                int errorCode = Marshal.GetLastWin32Error();
                throw new Win32Exception(errorCode, $"Failed to load library 'User32.dll'. Error {errorCode}: {new Win32Exception(Marshal.GetLastWin32Error()).Message}.");
            }



            _windowsHookHandle = SetWindowsHookEx(WH_KEYBOARD_LL, _hookProc, _user32LibraryHandle, 0);
            if (_windowsHookHandle == IntPtr.Zero)
            {
                int errorCode = Marshal.GetLastWin32Error();
                throw new Win32Exception(errorCode, $"Failed to adjust keyboard hooks for '{Process.GetCurrentProcess().ProcessName}'. Error {errorCode}: {new Win32Exception(Marshal.GetLastWin32Error()).Message}.");
            }
        }

        protected virtual void Dispose(bool disposing)
        {
            if (disposing)
            {
                // because we can unhook only in the same thread, not in garbage collector thread
                if (_windowsHookHandle != IntPtr.Zero)
                {
                    if (!UnhookWindowsHookEx(_windowsHookHandle))
                    {
                        int errorCode = Marshal.GetLastWin32Error();
                        throw new Win32Exception(errorCode, $"Failed to remove keyboard hooks for '{Process.GetCurrentProcess().ProcessName}'. Error {errorCode}: {new Win32Exception(Marshal.GetLastWin32Error()).Message}.");
                    }
                    _windowsHookHandle = IntPtr.Zero;

                    // ReSharper disable once DelegateSubtraction
                    _hookProc -= LowLevelKeyboardProc;
                }
            }

            if (_user32LibraryHandle != IntPtr.Zero)
            {
                if (!FreeLibrary(_user32LibraryHandle)) // reduces reference to library by 1.
                {
                    int errorCode = Marshal.GetLastWin32Error();
                    throw new Win32Exception(errorCode, $"Failed to unload library 'User32.dll'. Error {errorCode}: {new Win32Exception(Marshal.GetLastWin32Error()).Message}.");
                }
                _user32LibraryHandle = IntPtr.Zero;
            }
        }

        ~GlobalKeyboardHook()
        {
            Dispose(false);
        }

        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }

        private IntPtr _windowsHookHandle;
        private IntPtr _user32LibraryHandle;
        private HookProc _hookProc;

        delegate IntPtr HookProc(int nCode, IntPtr wParam, IntPtr lParam);

        [DllImport("kernel32.dll")]
        private static extern IntPtr LoadLibrary(string lpFileName);

        [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
        private static extern bool FreeLibrary(IntPtr hModule);

        /// <summary>
        /// The SetWindowsHookEx function installs an application-defined hook procedure into a hook chain.
        /// You would install a hook procedure to monitor the system for certain types of events. These events are
        /// associated either with a specific thread or with all threads in the same desktop as the calling thread.
        /// </summary>
        /// <param name="idHook">hook type</param>
        /// <param name="lpfn">hook procedure</param>
        /// <param name="hMod">handle to application instance</param>
        /// <param name="dwThreadId">thread identifier</param>
        /// <returns>If the function succeeds, the return value is the handle to the hook procedure.</returns>
        [DllImport("USER32", SetLastError = true)]
        static extern IntPtr SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hMod, int dwThreadId);

        /// <summary>
        /// The UnhookWindowsHookEx function removes a hook procedure installed in a hook chain by the SetWindowsHookEx function.
        /// </summary>
        /// <param name="hhk">handle to hook procedure</param>
        /// <returns>If the function succeeds, the return value is true.</returns>
        [DllImport("USER32", SetLastError = true)]
        public static extern bool UnhookWindowsHookEx(IntPtr hHook);

        /// <summary>
        /// The CallNextHookEx function passes the hook information to the next hook procedure in the current hook chain.
        /// A hook procedure can call this function either before or after processing the hook information.
        /// </summary>
        /// <param name="hHook">handle to current hook</param>
        /// <param name="code">hook code passed to hook procedure</param>
        /// <param name="wParam">value passed to hook procedure</param>
        /// <param name="lParam">value passed to hook procedure</param>
        /// <returns>If the function succeeds, the return value is true.</returns>
        [DllImport("USER32", SetLastError = true)]
        static extern IntPtr CallNextHookEx(IntPtr hHook, int code, IntPtr wParam, IntPtr lParam);

        [StructLayout(LayoutKind.Sequential)]
        public struct LowLevelKeyboardInputEvent
        {
            /// <summary>
            /// A virtual-key code. The code must be a value in the range 1 to 254.
            /// </summary>
            public int VirtualCode;

            /// <summary>
            /// A hardware scan code for the key. 
            /// </summary>
            public int HardwareScanCode;

            /// <summary>
            /// The extended-key flag, event-injected Flags, context code, and transition-state flag. This member is specified as follows. An application can use the following values to test the keystroke Flags. Testing LLKHF_INJECTED (bit 4) will tell you whether the event was injected. If it was, then testing LLKHF_LOWER_IL_INJECTED (bit 1) will tell you whether or not the event was injected from a process running at lower integrity level.
            /// </summary>
            public int Flags;

            /// <summary>
            /// The time stamp stamp for this message, equivalent to what GetMessageTime would return for this message.
            /// </summary>
            public int TimeStamp;

            /// <summary>
            /// Additional information associated with the message. 
            /// </summary>
            public IntPtr AdditionalInformation;
        }

        public const int WH_KEYBOARD_LL = 13;
        //const int HC_ACTION = 0;

        public enum KeyboardState
        {
            KeyDown = 0x0100,
            KeyUp = 0x0101,
            SysKeyDown = 0x0104,
            SysKeyUp = 0x0105
        }

        public const int VkSnapshot = 0x2c;
        //const int VkLwin = 0x5b;
        //const int VkRwin = 0x5c;
        //const int VkTab = 0x09;
        //const int VkEscape = 0x18;
        //const int VkControl = 0x11;
        const int KfAltdown = 0x2000;
        public const int LlkhfAltdown = (KfAltdown >> 8);

        public IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam)
        {
            bool fEatKeyStroke = false;

            var wparamTyped = wParam.ToInt32();
            if (Enum.IsDefined(typeof(KeyboardState), wparamTyped))
            {
                object o = Marshal.PtrToStructure(lParam, typeof(LowLevelKeyboardInputEvent));
                LowLevelKeyboardInputEvent p = (LowLevelKeyboardInputEvent)o;

                var eventArguments = new GlobalKeyboardHookEventArgs(p, (KeyboardState)wparamTyped);

                EventHandler<GlobalKeyboardHookEventArgs> handler = KeyboardPressed;
                handler?.Invoke(this, eventArguments);

                fEatKeyStroke = eventArguments.Handled;
            }

            return fEatKeyStroke ? (IntPtr)1 : CallNextHookEx(IntPtr.Zero, nCode, wParam, lParam);
        }
    }
}

용법:

using System;
using System.Windows.Forms;

namespace SnagFree.TrayApp.Core
{
    internal class Controller : IDisposable
    {
        private GlobalKeyboardHook _globalKeyboardHook;

        public void SetupKeyboardHooks()
        {
            _globalKeyboardHook = new GlobalKeyboardHook();
            _globalKeyboardHook.KeyboardPressed += OnKeyPressed;
        }

        private void OnKeyPressed(object sender, GlobalKeyboardHookEventArgs e)
        {
            //Debug.WriteLine(e.KeyboardData.VirtualCode);

            if (e.KeyboardData.VirtualCode != GlobalKeyboardHook.VkSnapshot)
                return;

            // seems, not needed in the life.
            //if (e.KeyboardState == GlobalKeyboardHook.KeyboardState.SysKeyDown &&
            //    e.KeyboardData.Flags == GlobalKeyboardHook.LlkhfAltdown)
            //{
            //    MessageBox.Show("Alt + Print Screen");
            //    e.Handled = true;
            //}
            //else

            if (e.KeyboardState == GlobalKeyboardHook.KeyboardState.KeyDown)
            {
                MessageBox.Show("Print Screen");
                e.Handled = true;
            }
        }

        public void Dispose()
        {
            _globalKeyboardHook?.Dispose();
        }
    }
}
— 시아 헤이 쿠 추크
소스
4
와우, 대단해! alt-F4를 캡처하여 응용 프로그램이 닫히는 것을 방지 할 수도 있습니다. 예제에서 C # 6.0을 사용했습니다. :)
— Bigjim
1
감사! 이 코드를 사용했는데 작동하지만 잠시 후 키를 누르면 델리게이트가 가비지 수집되고 관리 코드가 유지해야한다는 예외가 있습니다. 그런 다음 널 참조 예외가 있습니다. 이것으로 나를 도울 수 있습니까?
— Nabzi
2
에 추가 public Keys Key { get { return (Keys)VirtualCode; } }하는 것이 좋습니다 LowLevelKeyboardInputEvent. 이것은 모든 사람이 구글에 가지고있는 가상 코드를 다룰 필요가 있습니다. 또한 : 그런 다음 변경할 수 있습니다 VkSnapshot인에서 int로 Keys와 easely 단지 키를 놓습니다. 나는 한 걸음 더 나아가 public static Keys[] RegisteredKeys. OnPressed가 제공됩니다 if (!GlobalKeyboardHook.RegisteredKeys.Contains(e.KeyboardData.Key)) return;. 이벤트가 시작되는 것을 확실히 막을 수 있습니다.).
— C4d
1
@dube 10 년 후? 잘 모르겠습니다. 그러나 나는 요점을 얻습니다. 1 년이 지난 내 댓글을 보면 따라 가기가 너무 힘들 것 같다. 오늘 저녁에 알림을 설정하겠습니다. 재구성 할 시간이 좀있을 겁니다.
— C4d
1
@dube hehe,이 질문은 10 년 전입니다. 아래에 수정 된 버전을 게시했습니다. 재미있게 보내세요!
— C4d
8

dube의 요청에 따라 Siarhei Kuchuk 의 답변 수정 버전을 게시하고 있습니다.
내 변경 사항을 확인하려면 // EDT. 나는 그것의 대부분을 언급했습니다.

설정

class GlobalKeyboardHookEventArgs : HandledEventArgs
{
    public GlobalKeyboardHook.KeyboardState KeyboardState { get; private set; }
    public GlobalKeyboardHook.LowLevelKeyboardInputEvent KeyboardData { get; private set; }

    public GlobalKeyboardHookEventArgs(
        GlobalKeyboardHook.LowLevelKeyboardInputEvent keyboardData,
        GlobalKeyboardHook.KeyboardState keyboardState)
    {
        KeyboardData = keyboardData;
        KeyboardState = keyboardState;
    }
}

//Based on https://gist.github.com/Stasonix
class GlobalKeyboardHook : IDisposable
{
    public event EventHandler<GlobalKeyboardHookEventArgs> KeyboardPressed;

    // EDT: Added an optional parameter (registeredKeys) that accepts keys to restict
    // the logging mechanism.
    /// <summary>
    /// 
    /// </summary>
    /// <param name="registeredKeys">Keys that should trigger logging. Pass null for full logging.</param>
    public GlobalKeyboardHook(Keys[] registeredKeys = null)
    {
        RegisteredKeys = registeredKeys;
        _windowsHookHandle = IntPtr.Zero;
        _user32LibraryHandle = IntPtr.Zero;
        _hookProc = LowLevelKeyboardProc; // we must keep alive _hookProc, because GC is not aware about SetWindowsHookEx behaviour.

        _user32LibraryHandle = LoadLibrary("User32");
        if (_user32LibraryHandle == IntPtr.Zero)
        {
            int errorCode = Marshal.GetLastWin32Error();
            throw new Win32Exception(errorCode, $"Failed to load library 'User32.dll'. Error {errorCode}: {new Win32Exception(Marshal.GetLastWin32Error()).Message}.");
        }



        _windowsHookHandle = SetWindowsHookEx(WH_KEYBOARD_LL, _hookProc, _user32LibraryHandle, 0);
        if (_windowsHookHandle == IntPtr.Zero)
        {
            int errorCode = Marshal.GetLastWin32Error();
            throw new Win32Exception(errorCode, $"Failed to adjust keyboard hooks for '{Process.GetCurrentProcess().ProcessName}'. Error {errorCode}: {new Win32Exception(Marshal.GetLastWin32Error()).Message}.");
        }
    }

    protected virtual void Dispose(bool disposing)
    {
        if (disposing)
        {
            // because we can unhook only in the same thread, not in garbage collector thread
            if (_windowsHookHandle != IntPtr.Zero)
            {
                if (!UnhookWindowsHookEx(_windowsHookHandle))
                {
                    int errorCode = Marshal.GetLastWin32Error();
                    throw new Win32Exception(errorCode, $"Failed to remove keyboard hooks for '{Process.GetCurrentProcess().ProcessName}'. Error {errorCode}: {new Win32Exception(Marshal.GetLastWin32Error()).Message}.");
                }
                _windowsHookHandle = IntPtr.Zero;

                // ReSharper disable once DelegateSubtraction
                _hookProc -= LowLevelKeyboardProc;
            }
        }

        if (_user32LibraryHandle != IntPtr.Zero)
        {
            if (!FreeLibrary(_user32LibraryHandle)) // reduces reference to library by 1.
            {
                int errorCode = Marshal.GetLastWin32Error();
                throw new Win32Exception(errorCode, $"Failed to unload library 'User32.dll'. Error {errorCode}: {new Win32Exception(Marshal.GetLastWin32Error()).Message}.");
            }
            _user32LibraryHandle = IntPtr.Zero;
        }
    }

    ~GlobalKeyboardHook()
    {
        Dispose(false);
    }

    public void Dispose()
    {
        Dispose(true);
        GC.SuppressFinalize(this);
    }

    private IntPtr _windowsHookHandle;
    private IntPtr _user32LibraryHandle;
    private HookProc _hookProc;

    delegate IntPtr HookProc(int nCode, IntPtr wParam, IntPtr lParam);

    [DllImport("kernel32.dll")]
    private static extern IntPtr LoadLibrary(string lpFileName);

    [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
    private static extern bool FreeLibrary(IntPtr hModule);

    /// <summary>
    /// The SetWindowsHookEx function installs an application-defined hook procedure into a hook chain.
    /// You would install a hook procedure to monitor the system for certain types of events. These events are
    /// associated either with a specific thread or with all threads in the same desktop as the calling thread.
    /// </summary>
    /// <param name="idHook">hook type</param>
    /// <param name="lpfn">hook procedure</param>
    /// <param name="hMod">handle to application instance</param>
    /// <param name="dwThreadId">thread identifier</param>
    /// <returns>If the function succeeds, the return value is the handle to the hook procedure.</returns>
    [DllImport("USER32", SetLastError = true)]
    static extern IntPtr SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hMod, int dwThreadId);

    /// <summary>
    /// The UnhookWindowsHookEx function removes a hook procedure installed in a hook chain by the SetWindowsHookEx function.
    /// </summary>
    /// <param name="hhk">handle to hook procedure</param>
    /// <returns>If the function succeeds, the return value is true.</returns>
    [DllImport("USER32", SetLastError = true)]
    public static extern bool UnhookWindowsHookEx(IntPtr hHook);

    /// <summary>
    /// The CallNextHookEx function passes the hook information to the next hook procedure in the current hook chain.
    /// A hook procedure can call this function either before or after processing the hook information.
    /// </summary>
    /// <param name="hHook">handle to current hook</param>
    /// <param name="code">hook code passed to hook procedure</param>
    /// <param name="wParam">value passed to hook procedure</param>
    /// <param name="lParam">value passed to hook procedure</param>
    /// <returns>If the function succeeds, the return value is true.</returns>
    [DllImport("USER32", SetLastError = true)]
    static extern IntPtr CallNextHookEx(IntPtr hHook, int code, IntPtr wParam, IntPtr lParam);

    [StructLayout(LayoutKind.Sequential)]
    public struct LowLevelKeyboardInputEvent
    {
        /// <summary>
        /// A virtual-key code. The code must be a value in the range 1 to 254.
        /// </summary>
        public int VirtualCode;

        // EDT: added a conversion from VirtualCode to Keys.
        /// <summary>
        /// The VirtualCode converted to typeof(Keys) for higher usability.
        /// </summary>
        public Keys Key { get { return (Keys)VirtualCode; } }

        /// <summary>
        /// A hardware scan code for the key. 
        /// </summary>
        public int HardwareScanCode;

        /// <summary>
        /// The extended-key flag, event-injected Flags, context code, and transition-state flag. This member is specified as follows. An application can use the following values to test the keystroke Flags. Testing LLKHF_INJECTED (bit 4) will tell you whether the event was injected. If it was, then testing LLKHF_LOWER_IL_INJECTED (bit 1) will tell you whether or not the event was injected from a process running at lower integrity level.
        /// </summary>
        public int Flags;

        /// <summary>
        /// The time stamp stamp for this message, equivalent to what GetMessageTime would return for this message.
        /// </summary>
        public int TimeStamp;

        /// <summary>
        /// Additional information associated with the message. 
        /// </summary>
        public IntPtr AdditionalInformation;
    }

    public const int WH_KEYBOARD_LL = 13;
    //const int HC_ACTION = 0;

    public enum KeyboardState
    {
        KeyDown = 0x0100,
        KeyUp = 0x0101,
        SysKeyDown = 0x0104,
        SysKeyUp = 0x0105
    }

    // EDT: Replaced VkSnapshot(int) with RegisteredKeys(Keys[])
    public static Keys[] RegisteredKeys;
    const int KfAltdown = 0x2000;
    public const int LlkhfAltdown = (KfAltdown >> 8);

    public IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam)
    {
        bool fEatKeyStroke = false;

        var wparamTyped = wParam.ToInt32();
        if (Enum.IsDefined(typeof(KeyboardState), wparamTyped))
        {
            object o = Marshal.PtrToStructure(lParam, typeof(LowLevelKeyboardInputEvent));
            LowLevelKeyboardInputEvent p = (LowLevelKeyboardInputEvent)o;

            var eventArguments = new GlobalKeyboardHookEventArgs(p, (KeyboardState)wparamTyped);

            // EDT: Removed the comparison-logic from the usage-area so the user does not need to mess around with it.
            // Either the incoming key has to be part of RegisteredKeys (see constructor on top) or RegisterdKeys
            // has to be null for the event to get fired.
            var key = (Keys)p.VirtualCode;
            if (RegisteredKeys == null || RegisteredKeys.Contains(key))
            {
                EventHandler<GlobalKeyboardHookEventArgs> handler = KeyboardPressed;
                handler?.Invoke(this, eventArguments);

                fEatKeyStroke = eventArguments.Handled;
            }
        }

        return fEatKeyStroke ? (IntPtr)1 : CallNextHookEx(IntPtr.Zero, nCode, wParam, lParam);
    }
}

사용법 차이는 여기에서 확인할 수 있습니다.

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private GlobalKeyboardHook _globalKeyboardHook;

    private void buttonHook_Click(object sender, EventArgs e)
    {
        // Hooks only into specified Keys (here "A" and "B").
        _globalKeyboardHook = new GlobalKeyboardHook(new Keys[] { Keys.A, Keys.B });

        // Hooks into all keys.
        _globalKeyboardHook = new GlobalKeyboardHook();
        _globalKeyboardHook.KeyboardPressed += OnKeyPressed;
    }

    private void OnKeyPressed(object sender, GlobalKeyboardHookEventArgs e)
    {
        // EDT: No need to filter for VkSnapshot anymore. This now gets handled
        // through the constructor of GlobalKeyboardHook(...).
        if (e.KeyboardState == GlobalKeyboardHook.KeyboardState.KeyDown)
        {
            // Now you can access both, the key and virtual code
            Keys loggedKey = e.KeyboardData.Key;
            int loggedVkCode = e.KeyboardData.VirtualCode;
        }
    }
}

그의 게시물에 대한 Siarhei Kuchuk 에게 감사드립니다 . 심지어 나는 사용법을 단순화했습니다.이 초기 코드는 나에게 매우 유용했습니다.

— C4d
소스
코드에 문제가있었습니다. 우선, XNA 래퍼가있는 마지막 버전이고 제가 작성한 오래된 3D 소프트웨어가 있기 때문에 여전히 VS2012를 포함하여 일부 작업을 사용합니다. C # 6 연산자가 대신 사용되었습니다.
— shooky
1
작동하지 않았지만 VS2012에서 필요했기 때문에 문제가 될 수 있습니다. 내가 찾은 문제는 C # 6에서도 사실이라고 생각합니다. GlobalKeyboardHook 생성자 (위)는 다음으로 시작합니다. RegisteredKeys = registeredKeys; 불행히도 registeredKeys는 지속되지 않으므로 해당 포인터는 반환시 무효화되고 이후 모든 호출에서 null입니다. 내 수정은 도중에 null을 확인하고 생성자에서 동일한 크기의 배열 (정적 및 영구)을 만들고 전달 된 배열 데이터를 여기에 복사하는 것입니다. 상관없이 대단히 감사합니다. 감사합니다!
— shooky
여러 번의 키를 누른 후 실패하는 것 같습니다. Managed Debugging Assistant 'CallbackOnCollectedDelegate'Message = Managed Debugging Assistant 'CallbackOnCollectedDelegate': ''Keyboard! Keyboard.GlobalKeyboardHook + HookProc :: Invoke '유형의 가비지 수집 대리자에서 콜백이 만들어졌습니다. 이로 인해 응용 프로그램 충돌, 손상 및 데이터 손실이 발생할 수 있습니다. 관리되지 않는 코드에 대리자를 전달할 때는 절대 호출되지 않는다는 것이 보장 될 때까지 관리되는 응용 프로그램에 의해 유지되어야합니다. '
— GDutton 2011
@ C4d 핫키가 캡처되었지만 MessageBox(처리기가 활성 상태이고 작동하는지 확인하기 위해) 다음 오류를 표시 한 후 즉시 다음 오류가 표시됩니다. Managed Debugging Assistant 'CallbackOnCollectedDelegate' : 'A callback was made on a garbage collected delegate of type 'GlobalKeyboardHook+HookProc::Invoke'. This may cause application crashes, corruption and data loss. When passing delegates to unmanaged code, they must be kept alive by the managed application until it is guaranteed that they will never be called.'이 예외를 어떻게 해결할 수 있습니까?
— Chad
^ 위 예외는 하단의 다음 줄에서 발생합니다 LowLeveKeyboardProc().return fEatKeyStroke ? (IntPtr)1 : CallNextHookEx(IntPtr.Zero, nCode, wParam, lParam);
— Chad
0

내 담당자는 의견에 너무 낮은,하지만 관련된 CallbackOnCollectedDelegate예외, 나는 수정 public void SetupKeyboardHooks()에 C4D의 이 같은 모습에 대답 :

public void SetupKeyboardHooks(out object hookProc)
{
  _globalKeyboardHook = new GlobalKeyboardHook();
  _globalKeyboardHook.KeyboardPressed += OnKeyPressed;


  hookProc = _globalKeyboardHook.GcSafeHookProc;
}

OP에서 GcSafeHookProc공개 게터는 어디에 있습니까?_hookProc

_hookProc = LowLevelKeyboardProc; // we must keep alive _hookProc, because GC is not aware about SetWindowsHookEx behaviour.

를 hookProc호출하는 클래스의 개인 필드 SetupKeyboardHooks(...)로을 저장하여 참조를 유지하고 가비지 수집에서 CallbackOnCollectedDelegate제외하고 더 이상 예외가 아닙니다 . GlobalKeyboardHook클래스 에이 추가 참조가있는 것으로는 충분하지 않은 것 같습니다 . 앱을 닫을 때이 참조도 삭제되었는지 확인하십시오.

— Sterlingberger
소스
-3 
private void buttonHook_Click(object sender, EventArgs e)
{
    // Hooks only into specified Keys (here "A" and "B").
    // (***) Use this constructor

    _globalKeyboardHook = new GlobalKeyboardHook(new Keys[] { Keys.A, Keys.B });

    // Hooks into all keys.
    // (***) Or this - not both

    _globalKeyboardHook = new GlobalKeyboardHook();
    _globalKeyboardHook.KeyboardPressed += OnKeyPressed;
}

그리고 잘 작동합니다.

— Nemo
소스
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