基于消息的异步套接字UDP接收

1. 新建mfc工程receive,在receive.cpp的InitInstance函数中加载套接字：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; 2. 项目配置属性-链接器-输入-附加依赖项-ws2_32.lib3. *Dlg.h中加入private:SOCKET m_socket;SOCKET m_socket1;4. Dlg类增加BOOL型函数InitSocket bool CreceiveDlg:InitSocket()m_socket=WSASocket(AF_INET,SOCK_DGRAM,0,NULL,0,0);if(INVALID_SOCKET=m_socket)MessageBox(创建套接字失败！);return FALSE;SOCKADDR_IN addrSock; addrSock.sin_addr.S_un.S_addr=htonl(INADDR_ANY);addrSock.sin_family=AF_INET;addrSock.sin_port=htons(3000);if(SOCKET_ERROR=bind(m_socket,(SOCKADDR*)&addrSock,sizeof(SOCKADDR)MessageBox(绑定失败！);return FALSE;if(SOCKET_ERROR=WSAAsyncSelect(m_socket,m_hWnd,UM_SOCK,FD_READ)MessageBox(注册网络读取事件失败！);return FALSE;m_socket1=WSASocket(AF_INET,SOCK_DGRAM,0,NULL,0,0);if(INVALID_SOCKET=m_socket1)MessageBox(创建套接字失败！);return FALSE;SOCKADDR_IN addrSock1;addrSock1.sin_addr.S_un.S_addr=htonl(INADDR_ANY);addrSock1.sin_family=AF_INET;addrSock1.sin_port=htons(3001);if(SOCKET_ERROR=bind(m_socket1,(SOCKADDR*)&addrSock1,sizeof(SOCKADDR)MessageBox(绑定失败！);return FALSE;if(SOCKET_ERROR=WSAAsyncSelect(m_socket1,m_hWnd,UM_SOCK1,FD_READ)MessageBox(注册网络读取事件失败！);return FALSE;return TRUE;5. Dlg.cpp的:OnInitDialog中加入InitSocket();6. Dlg.h加入#define UM_SOCKWM_USER+1#define UM_SOCK1WM_USER+27. Dlg.h加入afx_msg LRESULT OnSock(WPARAM,LPARAM);afx_msg LRESULT OnSock1(WPARAM,LPARAM);8. Dlg.cpp加入ON_MESSAGE(UM_SOCK,OnSock)ON_MESSAGE(UM_SOCK1,OnSock1)LRESULT CreceiveDlg:OnSock(WPARAM wParam,LPARAM lParam)switch(LOWORD(lParam)case FD_READ:SOCKADDR_IN addrFrom;int len=sizeof(SOCKADDR);double as;recvfrom(m_socket,(char*)&as,sizeof(as),0,(SOCKADDR*)&addrFrom,&len);UpdateData();a1=as;UpdateData(FALSE);break;return 0;LRESULT CreceiveDlg:OnSock1(WPARAM wParam,LPARAM lParam)switch(LOWORD(lParam)case FD_READ:SOCKADDR_IN addrFrom1;int len1=sizeof(SOCKADDR);double as1;recvfrom(m_socket1,(char*)&as1,sizeof(as1),0,(SOCKADDR*)&addrFrom1,&len1);UpdateData();a2=as1;UpdateData(FALSE);break;return 0;9（加不加皆可）加入2个析构函数：CreceiveApp:Creceiv