Winform跨进程通信

      using System;
      using System.Collections.Generic;
      using System.Linq;
      using System.Runtime.InteropServices;
      using System.Text;
      using System.Threading.Tasks;
      namespace 大屏Win
      {
         public class WinMessageHelper
          {
             private struct COPYDATASTRUCT
              {
                 public IntPtr dwData;
                 public int cbData;
                  [MarshalAs(UnmanagedType.LPStr)]
                 public string lpData;
              }
             //使用COPYDATA进行跨进程通信
             public const int WM_COPYDATA = 0x004A;
              [DllImport("User32.dll", EntryPoint = "SendMessage")]
             private static extern int SendMessage(
             int hWnd, // handle to destination window
             int Msg, // message
             int wParam, // first message parameter
             ref COPYDATASTRUCT lParam // second message parameter
              );
              [DllImport("User32.dll", EntryPoint = "FindWindow")]
             private static extern int FindWindow(string lpClassName, string lpWindowName);
             /// <summary>
             /// 发送消息
             /// </summary>
             /// <param name="windowReceiveTitle">接收方窗体标题名称</param>
             /// <param name="strData">要发送的数据</param>
             public static void Send(string windowReceiveTitle, string strData)
              {
                 int winHandler = FindWindow(null, windowReceiveTitle);
                 if (winHandler != 0)
                  {
                     byte[] sarr = System.Text.Encoding.Default.GetBytes(strData);
                     int len = sarr.Length + 1;
                      COPYDATASTRUCT cds;
                      cds.dwData = (IntPtr)100;
                      cds.lpData = strData;
                      cds.cbData = len;
                      SendMessage(winHandler, WM_COPYDATA, 0, ref cds);
                  }
              }
             /// <summary>
             /// 接收消息
             /// </summary>
             /// <example>
             /// 在窗体中覆盖接收消息函数
             /// protected override void DefWndProc(ref System.Windows.Forms.Message m)
             /// {
             /// switch(m.Msg)
             /// {
             /// case WinMessageHelper.WM_COPYDATA:
             /// string str = WinMessageHelper.Receive(ref m);
             /// break;
             /// default:
             /// base.DefWndProc(ref m);
             /// break;
             /// 
             /// }
             /// }
             /// </example>
             /// <returns>接收的到数据</returns>
             public static string Receive(ref System.Windows.Forms.Message m)
              {
                  COPYDATASTRUCT cds = new COPYDATASTRUCT();
                  Type cdsType = cds.GetType();
                  cds = (COPYDATASTRUCT)m.GetLParam(cdsType);
                 return cds.lpData;
              }
          }
      }
  
 

  
 
 

文章来源: zzzili.blog.csdn.net，作者：清雨小竹，版权归原作者所有，如需转载，请联系作者。

原文链接：zzzili.blog.csdn.net/article/details/115908192