UDP连接

最新推荐文章于 2024-05-30 22:28:02 发布

ghosthhh

最新推荐文章于 2024-05-30 22:28:02 发布

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分类专栏： VC 文章标签： socket null delete

本文链接：https://blog.youkuaiyun.com/ghosthhh/article/details/7898509

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该博客介绍了如何使用UDP套接字进行数据接收。通过`WSARecvFrom`函数从UDP连接中读取数据，初始化缓冲区，处理每帧1060字节的数据，并在接收错误时释放内存。

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	WORD wVersionRequested;
	WSADATA wsaData;
	int err;
	
	wVersionRequested = MAKEWORD( 2, 2 );
	
	err = WSAStartup( wVersionRequested, &wsaData );
	if ( err != 0 ) 
	{
		return FALSE;
	} 
	
	if ( LOBYTE( wsaData.wVersion ) != 2 ||
		HIBYTE( wsaData.wVersion ) != 2 )
	{
		WSACleanup();
		return FALSE; 
	}
	
	m_socket = WSASocket(AF_INET, SOCK_DGRAM, 0, NULL, 0, WSA_FLAG_OVERLAPPED);
	
	if (INVALID_SOCKET == m_socket)
	{
		AfxMessageBox("创建套接字失败！");
		return FALSE;
	}
	
	SOCKADDR_IN addrSock;
	addrSock.sin_family				= AF_INET;
	addrSock.sin_port				= htons(8900);
	addrSock.sin_addr.S_un.S_addr	= inet_addr("192.168.1.59");//上位机ip=192.168.1.59,
																//下位机IP=192.168.1.11
	

	if (SOCKET_ERROR == bind(m_socket, (SOCKADDR*)&addrSock, sizeof(SOCKADDR)))
	{
		AfxMessageBox("绑定失败！");
		return FALSE;
	}

	int timeout = 100*1;
	if (SOCKET_ERROR  == setsockopt(m_socket,SOL_SOCKET,SO_RCVTIMEO,(char*)&timeout,sizeof(timeout)))
	{
		TRACE("set sock opt fail.");
	}
	timeout = 100*1;
	if (SOCKET_ERROR  == setsockopt(m_socket,SOL_SOCKET,SO_SNDTIMEO,(char*)&timeout,sizeof(timeout)))
	{
		TRACE("set sock opt fail.");
	}

 if (SOCKET_ERROR == WSASendTo( m_socket, &wsabuf, 1, &dwSend, 0,
       (SOCKADDR*)&addrTo, sizeof(SOCKADDR), NULL, NULL))
  {
   delete []wsabuf.buf;
   return FALSE;
  }

 DWORD dwRead;
 DWORD dwFlag = 0;
 
 SOCKADDR_IN addrFrom;
 int len = sizeof(SOCKADDR);
 
 WSABUF wsabuf;
 wsabuf.buf = new char[1060];
 wsabuf.len = 1060;    //每帧实际长度
 
 memset(&g_waveBuf, 0, sizeof(WAVELENGTH_SOCKET));
 memset(&g_specBuf, 0, sizeof(SPCETRUEM_SOCKET));

  if (SOCKET_ERROR == WSARecvFrom(m_socket, &wsabuf, 1, &dwRead, &dwFlag,
       (SOCKADDR*)&addrFrom, &len, NULL, NULL))
  {
   delete []wsabuf.buf;
   return 0;
  }