WPF 利用HwndSource拦截Windows消息

蔚落 2024-02-19 20:59 9阅读 0赞

WPF下取得控件或窗体的句柄

窗体：  
IntPtr hwnd = new WindowInteropHelper(this).Handle;  
控件：  
IntPtr hwnd = ((HwndSource)PresentationSource.FromVisual(uielement)).Handle;

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

public partial class MainWindow : Window
        {
            public MainWindow()
            {
                InitializeComponent();
                Loaded+= 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
    
                int WM_SHOW_STOPBUTTON = 0x0400 + 100; //显示停止按钮
                int WM_SHOW_STARTBUTTON = 0x0400 + 101; //显示开始按钮
                switch (msg)
                {
                    case 1:
                        break;
                    case 2:
                        break;
                    default:
     
                        break;
                }
                return IntPtr.Zero;
            }
        }

可以在MFC中，编写自定义消息函数,注意，这里的窗体名称是指wpf窗体的Title属性，我这里的Title="MainWindow"

void MyTest::SendMessageToMainWindow(int nMsg)
    	{
    		HWND  mMainWindowHandle;
    		mMainWindowHandle = ::FindWindow(NULL, _T("MainWindow"));
    		SendMessage(mMainWindowHandle, nMsg, NULL, NULL);
    	}

#define WM_SHOW_STOPBUTTON (WM_USER+100) //显示停止按钮
    #define WM_SHOW_STARTBUTTON (WM_USER+101) //显示开始按钮
    
    void My::Clear()
    {
    
    	SendMessageToMainWindow(WM_SHOW_STOPBUTTON);
    }

参考

[https://blog.csdn.net/wcc27857285/article/details/78051333][https_blog.csdn.net_wcc27857285_article_details_78051333]

[https_blog.csdn.net_wcc27857285_article_details_78051333]: https://blog.csdn.net/wcc27857285/article/details/78051333