编写一段C语言代码，要求使用recv()接收客户端的信息，如“client 12345 12345”，将这段信息以空格为界分为三个部分，将后两个数据分别存入username和password两个字符数组中

在C语言中，我们可以使用recv()函数从网络连接中接收客户端的数据，然后使用strtok()函数按照指定分隔符（这里是空格）分割字符串。以下是示例代码： ```c #include <stdio.h> #include <string.h> #include <sys/socket.h> #include <arpa/inet.h> #include <unistd.h> #define BUFFER_SIZE 1024 int main(int argc, char *argv[]) { struct sockaddr_in server_addr; int client_sock, bytes_received; // 创建套接字 if ((client_sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) { perror("Error creating socket"); return 1; } // 设置服务器地址 server_addr.sin_family = AF_INET; server_addr.sin_port = htons(8080); // 假设端口为8080 inet_pton(AF_INET, "localhost", &server_addr.sin_addr); // 绑定并监听 if (bind(client_sock, (struct sockaddr *)&server_addr, sizeof(server_addr)) == -1) { perror("Error binding to address"); close(client_sock); return 1; } listen(client_sock, 5); printf("Server is listening...\n"); // 接收客户端连接请求 struct sockaddr_in client_addr; socklen_t addr_len = sizeof(client_addr); if ((bytes_received = accept(client_sock, (struct sockaddr *)&client_addr, &addr_len)) == -1) { perror("Error accepting connection"); close(client_sock); return 1; } char buffer[BUFFER_SIZE]; size_t read_size = recv(client_sock, buffer, BUFFER_SIZE - 1, 0); // 接收数据，去掉最后一个'\0' buffer[read_size] = '\0'; // 添加结束符 char *token = strtok(buffer, " "); // 使用空格分割字符串 if (!token) { printf("Invalid input received.\n"); close(client_sock); return 1; } char username[BUFFER_SIZE]; // 假设最多25字节存储用户名 strncpy(username, token, sizeof(username) - 1); username[sizeof(username) - 1] = '\0'; token = strtok(NULL, " "); // 进行第二次分割获取密码 if (!token) { printf("Username not followed by password.\n"); } else { char password[BUFFER_SIZE]; // 假设最多25字节存储密码 strncpy(password, token, sizeof(password) - 1); password[sizeof(password) - 1] = '\0'; printf("Username: %s\nPassword: %s\n", username, password); } close(client_sock); return 0; }