消息发送方
一、引入系统方法SendMessage
private const int WM_COPYDATA = 0x004A;//这个不要随意更改，否则可能造成读取数据报错
[DllImport("User32.dll", EntryPoint = "SendMessage")]
private static extern int SendMessage(IntPtr hWnd, int msg, int wParam, ref COPYDATASTRUCT lParam);二、声明数据传输结构体
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