SetWindowsHookEx c#

Posted 2023-02-22

【中文标题】SetWindowsHookEx c#

【英文标题】：

【发布时间】：2020-08-18 10:51:46

【问题描述】：

我想挂钩一个特定进程而不是全局挂钩，但我不知道在调用它时我必须在 SetWindowsHookEx 中放入什么。

我不明白HookProc和第三个参数是什么。

public Form1()

    InitializeComponent();

public enum HookType : int
        
            WH_JOURNALRECORD = 0,
            WH_JOURNALPLAYBACK = 1,
            WH_KEYBOARD = 2,
            WH_GETMESSAGE = 3,
            WH_CALLWNDPROC = 4,
            WH_CBT = 5,
            WH_SYSMSGFILTER = 6,
            WH_MOUSE = 7,
            WH_HARDWARE = 8,
            WH_DEBUG = 9,
            WH_SHELL = 10,
            WH_FOREGROUNDIDLE = 11,
            WH_CALLWNDPROCRET = 12,
            WH_KEYBOARD_LL = 13,
            WH_MOUSE_LL = 14
        
[DllImport("user32.dll", SetLastError = true)]                                   
static extern uint GetWindowThreadProcessId(IntPtr hWnd, IntPtr ProcessId);

[DllImport("user32.dll", SetLastError = true)]                                  
static extern IntPtr FindWindow(string lpClassName, string lpWindowName); 
      
[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr SetWindowsHookEx(HookType hookType, HookProc lpfn, IntPtr hMod, uint dwThreadId);


[DllImport("user32.dll")]
static extern int CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam);

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

public uint findWindowThreadId()
        
            uint idprocess;
            idFirstGt = GetWindowThreadProcessId(FindWindow(default(string), "ProcessName"), IntPtr.Zero);
            return idProcess;
        
public void SetHook()
        
            hhook = SetWindowsHookEx(HookType.WH_KEYBOARD,/* HERE  , AND HERE */, findWindowThreadId());
        

谢谢！

【参考方案1】：

HookProc 是您希望在 HookType 发生时执行的回调函数（您编写的）。

第三个参数（IntPtr hMod）仅在您的 HookProc 驻留在另一个库（又名 DLL）中时才相关。如果在您的代码中定义了 HookProc，那么您可以为此第三个参数指定 NULL。