c# 给 c++ 发送消息

最新推荐文章于 2022-05-10 11:27:03 发布

kusey

最新推荐文章于 2022-05-10 11:27:03 发布

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分类专栏： windows 文章标签： c# c++ string class delete user

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本文介绍了一种Windows环境下使用C#向C++应用程序发送消息的方法。通过调用FindWindow和SendMessage两个API函数定位目标窗口并发送自定义消息。C++端通过ON_MESSAGE宏注册消息处理函数。

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Windows 下 c# 给 c++ 发送消息，记录下来。

这里是 c# 发送消息的代码：

using System.Runtime.InteropServices; public class Useful { public const int MWM_TEST = 6688; [DllImport("user32.dll", EntryPoint = "FindWindow")] public static extern IntPtr FindWindow(String strClassName, String strWindowName); [DllImport("user32.dll", EntryPoint = "SendMessage")] public static extern int SendMessage(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam); } public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void buttonSend_Click(object sender, EventArgs e) { int iId = Convert.ToInt32(textId.Text); int iOp = comboOperate.SelectedIndex; IntPtr hwnd = IntPtr.Zero; hwnd = Useful.FindWindow(null, "Cpp_HandleMsg"); if( IntPtr.Zero != hwnd ) { Useful.SendMessage(hwnd, Useful.MWM_TEST, (IntPtr)iId, (IntPtr)iOp); } } }

这里是 c++ 接收消息的代码：

afx_msg LRESULT OnTest( WPARAM wParam, LPARAM lParam ); ON_MESSAGE(MWM_TEST, &CMainFrame::OnTest) LRESULT CMainFrame::OnTest( WPARAM wParam, LPARAM lParam ) { int id = (int)wParam; int op = (int)lParam; CString strOperate; if( op ) { strOperate.Format( _T("%d inserted !"), id ); } else strOperate.Format( _T("%d delete !"), id ); AfxMessageBox( strOperate ); return 0; }

结果图如下：