sock.send（b'12'）

This code sends the bytes object b'12' through a socket connection. The variable "sock" is assumed to be a valid socket object that has been created and connected to a remote host. The bytes object is encoded in UTF-8 format by default, although this can be changed by specifying a different encoding when creating the bytes object.

相关问题

python socket.send

`socket.send()` 是 Python 中用于发送数据的方法，它用于通过网络套接字发送字节数据。你可以传递一个字节字符串作为参数来发送数据。例如，下面是一个简单的示例：

import socket

# 创建一个 TCP 套接字
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

# 连接到服务器
server_address = ('localhost', 12345)
sock.connect(server_address)

# 发送数据
message = b'Hello, server!'
sock.send(message)

# 关闭套接字
sock.close()

在上面的示例中，我们首先创建了一个 TCP 套接字，并使用 `connect()` 方法连接到服务器的地址。然后，我们使用 `send()` 方法发送一个字节字符串 `b'Hello, server!'` 到服务器。最后，我们关闭了套接字。

注意：`send()` 方法可能不会完全发送所有的数据，它可能只发送部分数据。如果需要确保所有数据都已发送，可以使用循环来反复调用 `send()` 方法直到所有数据都被发送出去。

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;
}