WPF 利用HwndSource拦截Windows消息

WPF提供了一个HwndSource可以使你更快的实现处理Windows消息。

通过HwndSource.FromHwnd得到的HwndSource可以添加(AddHook)移除(Remove)Hook

首先注册SourceInitialized事件,在事件中创建一个HwndSource对象,

然后利用其AddHook方法来将所有的windows消息附加到一个现有的事件中,这个就是WpfHandleWinowMsg。


代码如下:

 public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            SourceInitialized += HandleInitialized;
        }

        public void HandleInitialized(object o,EventArgs e)
        {
            IntPtr wptr = new WindowInteropHelper(this).Handle;
            HwndSource hs = HwndSource.FromHwnd(wptr);
            hs.AddHook(new HwndSourceHook(WpfHandleWinowMsg));
        }

        public IntPtr WpfHandleWinowMsg(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
        {   
            //这个函数可以做很多事情,只要是windows消息都会经过,例如注册全局快捷键,修改窗体大小边框,等等
            //也可以调API做对应的事情
            switch (msg)
            {
                case 1:
                    break;
                case 2:
                    break;
                default:

                    break;
            }
            return IntPtr.Zero;
        }
    }



顺带说下Winform,直接重载WndProc函数即可

public partial class Form1 : Form
{
       int WM_NCLBUTTONDBLCLK = 0xA3;
        protected override void WndProc(ref Message m)
        {
            if (m.Msg == WM_NCLBUTTONDBLCLK)
            {
                if (this.Height < 35)
                {
                    this.Height = h;
                }
                else
                {
                    h = this.Height;
                    this.Height = -10;
                }
                return;
            }
            base.WndProc(ref m);  //让基类去处理
        }
}


原文地址:https://www.cnblogs.com/kevinWu7/p/10163524.html