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/*---------------------------------------------------------------------------
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概述：UDP组播读写操作类，用于收发数据。
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使用环境：windows操作系统
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VS2008 VS2010 VS2013
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应用示例：
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1. 定义对象
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CMulticastSocket m_multiSocket;
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2. 初始化
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根据需要：执行函数2 或 3 或4
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3. 根据需要设置接收数据回调函数
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m_multiSocket.SetCallBack();
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4. 通过组播发送数据
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m_Serial.SendTo(buffer,10); // 举例
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5. 离开组播，释放资源
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m_Serial.LeaveGroup();
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其它接口函数根据实际需求进行调用。
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问题及解决情况记录：
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问题1：
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解决情况：
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问题2：
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解决情况：
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......
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修改记录:
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版本 日期 作者 备注
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V1.0 2016/12/28 王家星 在原有代码整理与简化，添加头文件注释
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----------------------------------------------------------------------------*/
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#if !defined(AFX_MULTICASTSOCKET_H__269E2C7F_2037_11D3_8EF3_0000C0FD25F8__INCLUDED_)
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#define AFX_MULTICASTSOCKET_H__269E2C7F_2037_11D3_8EF3_0000C0FD25F8__INCLUDED_
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#if _MSC_VER >= 1000
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#pragma once
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#endif // _MSC_VER >= 1000
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#include <afxsock.h>
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// 定义数据接收回调函数格式
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typedef void ( CALLBACK *RevNetDataCALLBACK )(const void* buffer, int length);
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class CMulticastSocket : public CAsyncSocket
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{
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// Operations
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public:
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CMulticastSocket();
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virtual ~CMulticastSocket();
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public:
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/* 【1】
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功能: 设置对网口UDP组播读入数据进行处理的回调函数
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输入:
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DataCallBack，串口回调函数地址
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输出：
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返回值:无
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*/
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void SetCallBack( RevNetDataCALLBACK DataCallBack)
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{
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m_RevData = DataCallBack;
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}
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/* 【2】
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功能: 创建接收数据Socket
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输入:
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1. strGroupIP，组播IP
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2. nGroupPort，组播端口号
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输出：
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返回值:创建成功返回True, 否则返回False
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*/
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BOOL CreateReceivingSocket(LPCTSTR strGroupIP, UINT nGroupPort);
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/* 【3】
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功能: 创建发送数据Socket
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输入:
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1. nTTL，（Time to Live）即数据最多可经过几个网关
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2. bLoopBack，是否接收自己发送的数据
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输出：
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返回值:创建成功返回True, 否则返回False
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*/
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BOOL CreateSendingSocket(UINT nTTL = 5, BOOL bLoopBack = FALSE);
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/* 【4】
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功能: 发送数据
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输入:
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1. strMessage，指针
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2. nSize，长度
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输出：
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返回值:发送成功返回True, 否则返回False
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*/
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BOOL SendTo(const void* strMessage, int nSize);
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/* 【5】
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功能: 功能2 + 功能3
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*/
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BOOL JoinGroup(CString GroupIP, UINT nGroupPort, UINT nTTL = 5, BOOL bLoopback = FALSE);
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/* 【6】
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功能: 退出组播
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输入:
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输出：
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返回值:退出成功返回True, 否则返回False
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*/
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BOOL LeaveGroup();
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private:
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RevNetDataCALLBACK m_RevData;
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char m_strBuffer[10240]; // Receiving buffer for the packet that has arrived
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SOCKADDR_IN m_saHostGroup; // SOCKADDR structure to hold IP/Port of the Host group to send data to it
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ip_mreq m_mrMReq; // Contains IP and interface of the host group
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UINT m_nSendersPort; // Holds Port No. of the socket from which last packet was received
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CString m_strSendersIP; // Hold IP of the socket from which the last packet was received
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UINT m_nLocalPort; // Ephemeral port number of the sending port
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CString m_strLocalIP; // IP Address of the local host or your machine
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BOOL bForceNoLoopback; // If interface does not support lopback and the service is required, the bool is set to true
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CAsyncSocket m_SendSocket; // Socket for sending data to the host group
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private:
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void SetLoopBack(BOOL);
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BOOL SetTTL(UINT nTTL);
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protected:
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virtual void OnReceive(int nErrorCode);
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};
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#endif // !defined(AFX_MULTICASTSOCKET_H__269E2C7F_2037_11D3_8EF3_0000C0FD25F8__INCLUDED_)
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