public IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
// Handle messages...
switch (msg)
{
case MSG_DEF.WM_COPYDATA:
{
COPYDATASTRUCT param = Marshal.PtrToStructure <COPYDATASTRUCT>(lParam);
// 不使用自定义结构体
// byte[] buffer = new byte[param.cbData];
// Marshal.Copy(param.lpData, buffer, 0, param.cbData);
// string content = Encoding.Default.GetString(buffer);
// 自定义结构体
LONGDATASTRUCT data = Marshal.PtrToStructure <LONGDATASTRUCT>(param.lpData);
// TODO: 数据处理
#if DEBUG
Debug.WriteLine($"Received: \n\tsender: {data.sender}\n\tcontent: {data.content}\n\ttag: {data.tag}");
#endif
handled = true;
break;
}
default:
break;
}
return(IntPtr.Zero);
}
public void SendMsg(string windowName)
{
IntPtr hWnd = WinApiHelper.FindWindow(null, windowName);
if (hWnd == IntPtr.Zero)
{
return;
}
// WinApiHelper.SetWindowText(hWnd, "Hello");
// WinApiHelper.ShowWindow(hWnd, 5);
// WinApiHelper.SetForegroundWindow(hWnd);
// WinApiHelper.SendMessage(hWnd, 0x1081, 0, "msg");
LONGDATASTRUCT longData = new LONGDATASTRUCT()
{
sender = System.Windows.Application.Current.MainWindow.Title,
content = "你好。",
tag = "来自 C# WPF"
};
// 将数据拷贝至非托管内存
IntPtr longDataPtr = Marshal.AllocHGlobal(Marshal.SizeOf(longData));
Marshal.StructureToPtr <LONGDATASTRUCT>(longData, longDataPtr, true);
COPYDATASTRUCT copyData = new COPYDATASTRUCT()
{
dwData = IntPtr.Zero,
cbData = Marshal.SizeOf(longData),
lpData = longDataPtr,
};
IntPtr cpDataPtr = Marshal.AllocHGlobal(Marshal.SizeOf(copyData));
Marshal.StructureToPtr(copyData, cpDataPtr, true);
WinApiHelper.SendMessage(hWnd, MSG_DEF.WM_COPYDATA, IntPtr.Zero, cpDataPtr);
// 释放掉相应的非托管内存数据
Marshal.FreeHGlobal(longDataPtr);
Marshal.FreeHGlobal(cpDataPtr);
}
