【Win32 API】利用SendMessage实现winform与wpf之间的消息传递

public MainWindow()
{
InitializeComponent();

this.Loaded += Window_Loaded;
}

#region 定义常量消息值
public const int WM_GETTEXT = 0x0D;
public const int WM_SETTEXT = 0x0C;
public const int WM_SIZEING = 0x0214;
public const int WM_COPYDATA = 0x004A;
public const int WM_LBUTTONDBLCLK = 0x0203;
#endregion

#region 定义结构体
public struct COPYDATASTRUCT
{
public IntPtr dwData;
public int cbData;
[MarshalAs(UnmanagedType.LPStr)]
public string lpData;
}
#endregion

private void Window_Loaded(object sender, RoutedEventArgs e)
{
HwndSource hWndSource;
WindowInteropHelper wih = new WindowInteropHelper(this);
hWndSource = HwndSource.FromHwnd(wih.Handle);
//添加处理程序
hWndSource.AddHook(MainWindowProc);
}
private IntPtr MainWindowProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
switch (msg)
{

case WM_COPYDATA:
{

COPYDATASTRUCT mystr = new COPYDATASTRUCT();
Type mytype = mystr.GetType();

COPYDATASTRUCT MyKeyboardHookStruct = (COPYDATASTRUCT)Marshal.PtrToStructure(lParam, typeof(COPYDATASTRUCT));
this.textbox.Text = MyKeyboardHookStruct.lpData;
break;

}
default:
{
break;
}

}
return IntPtr.Zero;
}