Question

我的项目中有一个Master（INCA工具），它包含一个A2l文件（它作为客户端中变量和地址的信息）。 Master将通过TCP层触发客户端（代码如下）。主要通过询问特定地址的变量值来触发客户端。下面的代码作为我的项目中提供的一些API并解释了它的作用。

在Master（INCA）中加载文件后，它会询问变量的值并调用以下API来发送和接收特定IP地址和端口号的帧。但我得到一个错误：没有工作基地分配给设备。错误：传输层失败，CEtasEthSocket :: connect：连接事件检查失败（10061 WSAGetLastError（））

此API就像一个客户端。

// pBytes : data to be transmitted
// numBytes: number of bytes at pBytes
// the above two data will be take care automatically and later I will SEND via the specified port 

void XcpApp_IpTransmit(uint16 port, Xcp_StatePtr8 pBytes, uint16 numBytes) // this function must transmit the specified byte on IP connection identified by port
{
        WSADATA wsa;
        SOCKET s;
        uint8 bytes_recieved;
        struct sockaddr_in server;  // creating a socket address structure: structure contains ip address and port number
         uint16 numTxBytes;
         uint8* pChunkData;
         uint16 chunkLen;
         port = 18000;  
         numTxBytes = 1;
            uint8 recv_data[100];


        printf("Initializing Winsock\n");
        if(WSAStartup(MAKEWORD(2,2), &wsa)!=0)
        {
            printf("Failed Error Code: %d", WSAGetLastError());
            return 1;
        }
        printf("Initialised\n");


        //CREATING a SOCKET

        if ((s = socket(AF_INET, SOCK_STREAM, 0)) == -1)
        {
            printf("Could not Create Socket\n");
            //return 0;
        }
        printf("Socket Created\n");




        //Binding between the socket and ip address
    server.sin_addr.s_addr = inet_addr("127.0.0.1");
    server.sin_family = AF_INET;     
        server.sin_port = htons(port); 


            //Connect to a remote server
        if(connect(s, (struct sockaddr*)&server, sizeof(server))<0)
        {
        puts("Connect Error\n");
        //return 1;
        }

        puts("Connected\n");







            while (1)
            { 

            //initally its waiting for the data to be received on the port s and stored in recv_data buffer of size 100
                        bytes_recieved = recv(s, recv_data, 100 ,0 );
                recv_data[bytes_recieved] = '\0';                // reading till the end of the buffer

                pChunkData = &recv_data;
                chunkLen = 1 ;

                //This is the given API, When ever the data is receives a frame on the IP port. I should call this function
                XcpIp_RxCallback (chunkLen, *pChunkData, port);   // original API is : void XcpIp_RxCallback (uint16 chunkLen, uint8* pChunkData, uint16 port); 

             // chunklen : number of bytes at pchunkdata
            // pChunkData : received frame
            //  port : port number

                  printf("received data from Master %d\n", *pChunkData);           


                //sending data from client to the Master

                send(s, pBytes, numBytes, 0);  // explained in the begining

                if (strcmp(pBytes, "q") != 0 && strcmp(pBytes, "Q") != 0) 
                send(s, pBytes, numBytes, 0); 

                else
                {
                    send(s, pBytes, numBytes, 0);
                     XcpIp_TxCallback (port, numTxBytes);
                         closesocket(s);
                WSACleanup();
                break;

            }
              }
            }
        XcpIp_OnTcpCxnClosed(port); // this iS AN API given to close the TCP connection.
        }

Answer 1

如果您将请求的100个字节作为最大值读取，则此行recv_data[bytes_recieved] = '\0';将失败。它将引发未定义的行为作为recv_data边界的写作。

要解决此问题，请更改此行：

bytes_recieved = recv(s, recv_data, 100 , 0 );

是

bytes_recieved = recv(s, recv_data, sizeof(recv_data)-1, 0);

如何解决此IP地址错误？

1 个答案: