C#钩子函数如果直接用按钮引用,则没有问题,如果把这个函数放到多线程里,就会发现钩子钩不上了,这个问题我搞了一个星期也没搞定,后来还是查资料的时候无意中看到类似的问题,试了一下,发现真的可以完美解决此问题,现在把解决方法记下!

解决方法:

只要在线程中加入下面这段代码就行了:

tagMSG Msgs;
            while (GetMessage(out Msgs, IntPtr.Zero, 0, 0) > 0)
            {
                TranslateMessage(ref Msgs);
                DispatchMessage(ref Msgs);
            }

其中结构体和函数的定义如下:

[DllImport("user32", EntryPoint = "GetMessage")]
        public static extern int GetMessage(
                        out tagMSG lpMsg,
                        IntPtr hwnd,
                        int wMsgFilterMin,
                        int wMsgFilterMax
        );

        [DllImport("user32", EntryPoint = "DispatchMessage")]
        public static extern int DispatchMessage(
                      ref   tagMSG lpMsg
        );

        [DllImport("user32", EntryPoint = "TranslateMessage")]
        public static extern int TranslateMessage(
                      ref   tagMSG lpMsg
        );

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

        public struct tagMSG
        {
            public int hwnd;
            public uint message;
            public int wParam;
            public long lParam;
            public uint time;
            public int pt;
        }

举个例子吧,下面1钩子不成功,2,3钩子成功:

1.(多线程失败)

private void Form1_Load(object sender, EventArgs e)
        {
            
            Thread th = new Thread(new ThreadStart(temp));
            th.IsBackground = true;
            //th.SetApartmentState(ApartmentState.STA);
            th.Start();

        }

        private void temp()
        {
            hookKeyBoard = new HookKeyBoard();
            hookKeyBoard.HookKeyBoardHandler += HookKeyBoardHandler;
            hookKeyBoard.SetHook();
            CheckForIllegalCrossThreadCalls = false;
        }

2.(不利用多线程成功)

private void Form1_Load(object sender, EventArgs e)
        {
            
            hookKeyBoard = new HookKeyBoard();
            hookKeyBoard.HookKeyBoardHandler += HookKeyBoardHandler;
            hookKeyBoard.SetHook();
            CheckForIllegalCrossThreadCalls = false;

        }

3. (多线程成功)

      private void Form1_Load(object sender, EventArgs e)
        {
            
            Thread th = new Thread(new ThreadStart(temp));
            th.IsBackground = true;
            //th.SetApartmentState(ApartmentState.STA);
            th.Start();

        }

        private void temp()
        {
            hookKeyBoard = new HookKeyBoard();
            hookKeyBoard.HookKeyBoardHandler += HookKeyBoardHandler;
            hookKeyBoard.SetHook();
            CheckForIllegalCrossThreadCalls = false;
            tagMSG Msgs;
            while (GetMessage(out Msgs, IntPtr.Zero, 0, 0) > 0)
            {
                TranslateMessage(ref Msgs);
                DispatchMessage(ref Msgs);
            }
        }