#include <iostream> #include <cstring> #include <sys/socket.h> #include <arpa/inet.h> #include <unistd.h> int main() { // 创建客户端套接字 int clientSocket = socket(AF_INET, SOCK_STREAM, 0); if (clientSocket == -1) { std::cerr << "无法创建套接字" << std::endl; return 1; } // 准备服务器地址结构体 sockaddr_in serverAddress{}; serverAddress.sin_family = AF_INET; serverAddress.sin_port = htons(8080);中有错误请帮我改正

在上述代码中，您将端口号错误地放置在了`serverAddress.sin_port`的赋值语句之后。正确的代码应该是将端口号放在赋值语句的右侧。以下是修改后的代码：

#include <iostream>
#include <cstring>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>

int main() {
    // 创建客户端套接字
    int clientSocket = socket(AF_INET, SOCK_STREAM, 0);
    if (clientSocket == -1) {
        std::cerr << "无法创建套接字" << std::endl;
        return 1;
    }

    // 准备服务器地址结构体
    sockaddr_in serverAddress{};
    serverAddress.sin_family = AF_INET;
    serverAddress.sin_port = htons(8080); // 正确的位置

    // 其他代码...

    return 0;
}

现在，端口号8080已正确赋值给`serverAddress.sin_port`。希望这个修改可以解决您的问题！

相关问题

#include <iostream> #include <string> #include <cstring> #include <netinet/in.h> #include <arpa/inet.h> #include <unistd.h> #include <strings.h> void Usage(std::string proc) { std::cout << "Usage: " << proc << " server_ip server_port" << std::endl; } // ./tcp_client server_ip server_port int main(int argc, char* argv[]) { if(argc != 3) { Usage(argv[0]); return 1; } std::string svr_ip = argv[1]; uint16_t svr_port = (uint16_t)atoi(argv[2]); // 1.创建套接字，打开网络文件 int sock = socket(AF_INET, SOCK_STREAM, 0); if(sock < 0) { std::cerr << "socket error!" << std::endl; return 2; iostream源文件里的代码

这是一个TCP客户端的源代码，可以用来连接TCP服务器并发送和接收数据。

这个程序包含了以下头文件：

#include <iostream>
#include <string>
#include <cstring>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <strings.h>

其中， `iostream` 和 `string` 用于输入输出和字符串操作， `netinet/in.h` 和 `arpa/inet.h` 用于网络编程中的地址转换， `unistd.h` 用于标准I/O操作， `strings.h` 用于字符串操作。

函数 `Usage` 用于输出程序的用法，函数 `main` 中通过命令行参数获取服务器的IP地址和端口号，并进行错误检查。

接下来，程序创建了一个套接字，使用 `socket` 函数：

// 1.创建套接字，打开网络文件
int sock = socket(AF_INET, SOCK_STREAM, 0);

`AF_INET` 表示使用IPv4协议， `SOCK_STREAM` 表示使用TCP协议。

接着，程序使用 `connect` 函数连接服务器：

// 2.向服务器发起连接请求
struct sockaddr_in server;
bzero(&server, sizeof(server));
server.sin_family = AF_INET;
server.sin_port = htons(svr_port);
server.sin_addr.s_addr = inet_addr(svr_ip.c_str());

if(connect(sock, (struct sockaddr*)&server, sizeof(server)) < 0)
{
    std::cerr << "connect error!" << std::endl;
    close(sock);
    return 3;
}

这里使用了 `struct sockaddr_in` 结构体来表示服务器的地址， `bzero` 函数用于将地址结构体清零， `htons` 函数用于将端口号从主机字节序转换为网络字节序， `inet_addr` 函数用于将IP地址转换为网络字节序。

如果连接成功，程序就可以使用 `send` 函数向服务器发送数据，使用 `recv` 函数接收服务器发来的数据。

最后，程序使用 `close` 函数关闭套接字。

将下列代码转化为C++代码：import socket def scan_ports(host, start_port, end_port, protocol='tcp'): for port in range(start_port, end_port + 1): try: if protocol == 'tcp': sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(1) # 设置超时时间为1秒 result = sock.connect_ex((host, port)) if result == 0: print(f"Port {port} is open") sock.close() elif protocol == 'udp': sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) sock.settimeout(1) sock.sendto(b'Ping', (host, port)) data, addr = sock.recvfrom(1024) if data: print(f"Port {port} is open") sock.close() else: print(f"Unsupported protocol {protocol}") return except socket.error: pass if __name__ == '__main__': host = '127.0.0.1' # 目标IP地址 start_port = 1 # 起始端口号 end_port = 65535 # 终止端口号 protocols = ['tcp', 'udp'] for protocol in protocols: print(f"Scanning {protocol} ports...") scan_ports(host, start_port, end_port, protocol)

以下是将代码转化为C++的结果：

#include <iostream>
#include <cstring>
#include <cstdlib>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

void scan_ports(const char* host, int start_port, int end_port, const char* protocol) {
    struct sockaddr_in target;
    int result, sock, port;
    memset(&target, 0, sizeof(target));
    target.sin_family = AF_INET;
    target.sin_addr.s_addr = inet_addr(host);

    for(port = start_port; port <= end_port; port++) {
        try {
            if(strcmp(protocol, "tcp") == 0) {
                sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
                if(sock < 0) {
                    std::cerr << "Failed to create socket.\n";
                    exit(1);
                }
                target.sin_port = htons(port);
                struct timeval timeout;
                timeout.tv_sec = 1;
                timeout.tv_usec = 0;
                setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof(timeout));
                setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout));
                result = connect(sock, (struct sockaddr*)&target, sizeof(target));
                if(result == 0) {
                    std::cout << "Port " << port << " is open.\n";
                }
                close(sock);
            }
            else if(strcmp(protocol, "udp") == 0) {
                sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
                if(sock < 0) {
                    std::cerr << "Failed to create socket.\n";
                    exit(1);
                }
                target.sin_port = htons(port);
                struct timeval timeout;
                timeout.tv_sec = 1;
                timeout.tv_usec = 0;
                setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof(timeout));
                setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout));
                char buffer[] = "Ping";
                result = sendto(sock, buffer, strlen(buffer), 0, (struct sockaddr*)&target, sizeof(target));
                if(result < 0) {
                    std::cerr << "Failed to send data.\n";
                    exit(1);
                }
                char recv_buffer[1024];
                socklen_t recv_len = sizeof(target);
                result = recvfrom(sock, recv_buffer, sizeof(recv_buffer), 0, (struct sockaddr*)&target, &recv_len);
                if(result > 0) {
                    std::cout << "Port " << port << " is open.\n";
                }
                close(sock);
            }
            else {
                std::cerr << "Unsupported protocol " << protocol << "\n";
                exit(1);
            }
        }
        catch(...) {
            continue;
        }
    }
}

int main(int argc, char** argv) {
    const char* host = "127.0.0.1";
    int start_port = 1;
    int end_port = 65535;
    const char* protocols[] = {"tcp", "udp"};
    int i, num_protocols = sizeof(protocols) / sizeof(protocols[0]);
    for(i = 0; i < num_protocols; i++) {
        std::cout << "Scanning " << protocols[i] << " ports...\n";
        scan_ports(host, start_port, end_port, protocols[i]);
    }
    return 0;
}