SetWindowsHookEx c#

Question

我想挂接一个特定的进程，而不是全局挂接，但我不知道在调用SetWindowsHookEx时必须放入什么。

我不明白什么是HookProc和第三个参数。

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());
        }

谢谢你！

Answer 1

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

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