c#做的全局鼠标/键盘钩子

对于C语言，作为一种高效的程序设计语言，它被广泛应用于嵌入式系统的开发和底层编程。同时，C语言也是其他编程语言的基础。在学习过程中，我们需要掌握的知识包括语法、指针、结构体、库函数等。C语言的语法简单规范，易于学习，同时它的指针概念也很重要，可以实现动态内存分配、数组操作等，但也容易出现指针误用等问题。C语言使用结构体可以将多个数据类型封装在一起，方便程序员对数据类型的选择和操作。C标准库函数提供了大量的功能，比如字符串处理、数学计算等，可以大大简化编程工作。总的来说，学习C语言可以使我们更深入地了解计算机底层工作原理，提高编程能力，并为未来学习其他编程语言打下坚实的基础。

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C#全局鼠标钩子完整源码

以下是C#全局鼠标钩子的完整源码：

首先，创建一个名为MouseHook的类，实现IMouseHook接口：

using System;
using System.Runtime.InteropServices;

namespace MouseHookExample
{
    public class MouseHook : IMouseHook
    {
        private const int WH_MOUSE_LL = 14;
        private const int WM_LBUTTONDOWN = 0x0201;
        private const int WM_RBUTTONDOWN = 0x0204;

        private LowLevelMouseProc _proc;
        private IntPtr _hookId = IntPtr.Zero;

        public event EventHandler<MouseEventArgs> LeftButtonDown;
        public event EventHandler<MouseEventArgs> RightButtonDown;

        public void Start()
        {
            _proc = HookCallback;
            _hookId = SetHook(_proc);
        }

        public void Stop()
        {
            UnhookWindowsHookEx(_hookId);
            _hookId = IntPtr.Zero;
        }

        private IntPtr SetHook(LowLevelMouseProc proc)
        {
            using (var curProcess = System.Diagnostics.Process.GetCurrentProcess())
            using (var curModule = curProcess.MainModule)
            {
                return SetWindowsHookEx(WH_MOUSE_LL, proc, GetModuleHandle(curModule.ModuleName), 0);
            }
        }

        private IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
        {
            if (nCode >= 0 && (wParam == (IntPtr)WM_LBUTTONDOWN || wParam == (IntPtr)WM_RBUTTONDOWN))
            {
                var hookStruct = (MSLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(MSLLHOOKSTRUCT));
                var args = new MouseEventArgs(hookStruct.pt.x, hookStruct.pt.y);

                if (wParam == (IntPtr)WM_LBUTTONDOWN)
                {
                    LeftButtonDown?.Invoke(this, args);
                }
                else if (wParam == (IntPtr)WM_RBUTTONDOWN)
                {
                    RightButtonDown?.Invoke(this, args);
                }
            }

            return CallNextHookEx(_hookId, nCode, wParam, lParam);
        }

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

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr SetWindowsHookEx(int idHook, LowLevelMouseProc 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);

        [StructLayout(LayoutKind.Sequential)]
        private struct POINT
        {
            public int x;
            public int y;
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct MSLLHOOKSTRUCT
        {
            public POINT pt;
            public uint mouseData;
            public uint flags;
            public uint time;
            public IntPtr dwExtraInfo;
        }
    }
}

接下来，定义一个名为MouseEventArgs的类，用于传递鼠标事件的参数：

using System;

namespace MouseHookExample
{
    public class MouseEventArgs : EventArgs
    {
        public int X { get; }
        public int Y { get; }

        public MouseEventArgs(int x, int y)
        {
            X = x;
            Y = y;
        }
    }
}

最后，定义一个名为IMouseHook的接口，用于规范MouseHook类的实现：

using System;

namespace MouseHookExample
{
    public interface IMouseHook
    {
        event EventHandler<MouseEventArgs> LeftButtonDown;
        event EventHandler<MouseEventArgs> RightButtonDown;

        void Start();
        void Stop();
    }
}

现在，我们可以在其他类中使用该鼠标钩子：

using System;

namespace MouseHookExample
{
    class Program
    {
        static void Main(string[] args)
        {
            var mouseHook = new MouseHook();
            mouseHook.LeftButtonDown += (sender, e) => Console.WriteLine($"Left button down at ({e.X}, {e.Y})");
            mouseHook.RightButtonDown += (sender, e) => Console.WriteLine($"Right button down at ({e.X}, {e.Y})");
            mouseHook.Start();

            Console.WriteLine("Press any key to exit...");
            Console.ReadKey();
            mouseHook.Stop();
        }
    }
}

现在，当用户按下鼠标左键或右键时，程序将在控制台中输出相应的信息。

C# 用全局钩子使鼠标按键左右键互换，鼠标移动反向相反

实现这个需求需要使用 C# 中的钩子函数来实现全局鼠标事件监听。具体步骤如下：

1. 引入 System.Runtime.InteropServices 命名空间。

2. 定义鼠标事件枚举类型：

public enum MouseEventFlags
{
    LEFTDOWN = 0x00000002,
    LEFTUP = 0x00000004,
    MIDDLEDOWN = 0x00000020,
    MIDDLEUP = 0x00000040,
    MOVE = 0x00000001,
    ABSOLUTE = 0x00008000,
    RIGHTDOWN = 0x00000008,
    RIGHTUP = 0x00000010,
    WHEEL = 0x00000800,
    XDOWN = 0x00000080,
    XUP = 0x00000100
}

3. 定义 MouseHookStruct 结构体：

[StructLayout(LayoutKind.Sequential)]
public struct MouseHookStruct
{
    public POINT pt;
    public int hwnd;
    public int wHitTestCode;
    public int dwExtraInfo;
}

4. 定义全局鼠标事件委托类型：

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

5. 定义全局变量和函数：

private static int hHook = 0;
private static HookProc HookProcedure;
[DllImport("user32.dll")]
public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);
[DllImport("user32.dll")]
public static extern int CallNextHookEx(int hHook, int nCode, IntPtr wParam, IntPtr lParam);
[DllImport("user32.dll")]
public static extern int UnhookWindowsHookEx(int hHook);

6. 实现钩子函数：

private static int MouseHookProc(int nCode, IntPtr wParam, IntPtr lParam)
{
    if (nCode >= 0)
    {
        MouseHookStruct mhs = (MouseHookStruct)Marshal.PtrToStructure(lParam, typeof(MouseHookStruct));
        if (wParam == (IntPtr)MouseEventFlags.LEFTDOWN)
        {
            MouseEventFlags button = MouseEventFlags.LEFTDOWN;
            MouseEventFlags swappedButton = MouseEventFlags.RIGHTDOWN;
            SwapMouseButton(button, swappedButton);
        }
        else if (wParam == (IntPtr)MouseEventFlags.RIGHTDOWN)
        {
            MouseEventFlags button = MouseEventFlags.RIGHTDOWN;
            MouseEventFlags swappedButton = MouseEventFlags.LEFTDOWN;
            SwapMouseButton(button, swappedButton);
        }
        else if (wParam == (IntPtr)MouseEventFlags.MOVE)
        {
            int x = mhs.pt.X;
            int y = mhs.pt.Y;
            SwapMouseMovement(ref x, ref y);
            mhs.pt.X = x;
            mhs.pt.Y = y;
            Marshal.StructureToPtr(mhs, lParam, true);
        }
    }
    return CallNextHookEx(hHook, nCode, wParam, lParam);
}

7. 实现鼠标按键互换和鼠标移动反向相反的方法：

private static void SwapMouseButton(MouseEventFlags button, MouseEventFlags swappedButton)
{
    int flags = GetSystemMetrics(0x0010);
    if ((flags & 0x0001) != 0)
    {
        // Primary mouse button is currently left button
        if ((button == MouseEventFlags.LEFTDOWN) || (button == MouseEventFlags.LEFTUP))
        {
            mouse_event((int)swappedButton, 0, 0, 0, 0);
        }
        else if ((button == MouseEventFlags.RIGHTDOWN) || (button == MouseEventFlags.RIGHTUP))
        {
            mouse_event((int)MouseEventFlags.LEFTDOWN, 0, 0, 0, 0);
            mouse_event((int)MouseEventFlags.LEFTUP, 0, 0, 0, 0);
        }
    }
    else
    {
        // Primary mouse button is currently right button
        if ((button == MouseEventFlags.RIGHTDOWN) || (button == MouseEventFlags.RIGHTUP))
        {
            mouse_event((int)swappedButton, 0, 0, 0, 0);
        }
        else if ((button == MouseEventFlags.LEFTDOWN) || (button == MouseEventFlags.LEFTUP))
        {
            mouse_event((int)MouseEventFlags.RIGHTDOWN, 0, 0, 0, 0);
            mouse_event((int)MouseEventFlags.RIGHTUP, 0, 0, 0, 0);
        }
    }
}

private static void SwapMouseMovement(ref int x, ref int y)
{
    int width = Screen.PrimaryScreen.Bounds.Width;
    int height = Screen.PrimaryScreen.Bounds.Height;
    x = width - x;
    y = height - y;
}

8. 注册全局钩子并启动：

HookProcedure = new HookProc(MouseHookProc);
hHook = SetWindowsHookEx(14, HookProcedure, Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]), 0);

需要注意的是，这里使用了 user32.dll 中的一些函数，需要在代码中进行引用。同时，这里使用了 SetWindowsHookEx 函数注册了一个全局鼠标钩子，需要在程序关闭时调用 UnhookWindowsHookEx 函数取消注册。