enum Choose { TcpHeartbeat = 200, TcpExeCmd }; // 定义结构体 struct DataPacket { int clientSockfd; enum Choose choose; char cmdBuf[100]; // 修改为固定大小的字符数组 char returnValue[100]; // 修改为固定大小的字符数组 }; struct DataPacket ReceivePackets; // 接收结构体 if (recv(clientSocket, &ReceivePackets, sizeof(ReceivePackets), 0) < 0) { perror("Failed to receive struct"); exit(EXIT_FAILURE); } // 分配内存给字符串指针字段 ReceivePackets.cmdBuf = malloc(strlen(ReceivePackets.cmdBuf) + 1); ReceivePackets.returnValue = malloc(strlen(ReceivePackets.returnValue) + 1); // 检查内存分配是否成功 if (ReceivePackets.cmdBuf == NULL || ReceivePackets.returnValue == NULL) { perror("Memory allocation failed"); exit(EXIT_FAILURE); } // 接收字符串指针字段 if (recv(clientSocket, ReceivePackets.cmdBuf, strlen(ReceivePackets.cmdBuf), 0) < 0) { perror("Failed to receive cmdBuf"); exit(EXIT_FAILURE); } if (recv(clientSocket, ReceivePackets.returnValue, strlen(ReceivePackets.returnValue), 0) < 0) { perror("Failed to receive returnValue"); exit(EXIT_FAILURE); } printf("returnValue: %s\n", ReceivePackets.returnValue); // 使用完后记得释放内存 free(ReceivePackets.cmdBuf); free(ReceivePackets.returnValue);那根据你这个代码示例，我应该怎么send的呢