解释一下这段代码 def socket_udp(self,ip,port,list): #HOST = '127.0.0.1';PORT = 9999; addr = (ip,port) # 设置IP、端口号、 s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)# 建立UDP的socket 这个称之为套接字。 list = list.encode(encoding="utf-8") # 指定一个字符串,并转换成socket发送的二进制流。 while True: s.sendto(list, addr) # 发送数据 # data, addr = s.recvfrom(1024) # 接收数据和返回地址 print (list.decode(encoding="utf-8")) #print(addr) time.sleep(1) s.close()
时间: 2024-03-18 13:45:03 浏览: 21
这段代码是一个Python程序的一部分,它定义了一个名为socket_udp的函数,该函数用于建立一个UDP套接字并向指定的IP地址和端口号发送数据。代码中的while True循环保证程序不停止,每次循环都会发送指定的数据。在发送数据之前,代码将字符串编码为二进制形式,以便可以发送到网络上。在发送数据后,代码会等待1秒钟,然后继续发送数据。最后,当程序完成时,它关闭了套接字。
相关问题
#set DB_HOST=127.0.0.1 #set ES_HOST=127.0.0.1 #set ES_PORT=9200 set OCR_ADDR=http://localhost:8866
这是一个命令行语句,用于设置环境变量。其中,"set DB_HOST=127.0.0.1" 将 DB_HOST 变量设置为 127.0.0.1,表示数据库的主机地址为本地主机。"set ES_HOST=127.0.0.1" 将 ES_HOST 变量设置为 127.0.0.1,表示 Elasticsearch 的主机地址为本地主机。"set ES_PORT=9200" 将 ES_PORT 变量设置为 9200,表示 Elasticsearch 的端口号为 9200。"set OCR_ADDR=http://localhost:8866" 将 OCR_ADDR 变量设置为 http://localhost:8866,表示 OCR 服务的地址为本地主机的 8866 端口。
这些设置将在程序执行期间使用,以连接到正确的主机和端口,并使用正确的 OCR 服务地址。
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:
```cpp
#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;
}
```
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