c++ 向指定ip地址创建及发送tcp socket代码
时间: 2024-01-23 21:03:03 浏览: 13
以下是一个 C 语言的示例代码,用于创建并发送 TCP Socket,可以向指定 IP 地址发送数据:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
void error(char *msg) {
perror(msg);
exit(1);
}
int main(int argc, char *argv[]) {
int sockfd, portno, n;
struct sockaddr_in serv_addr;
char buffer[256];
if (argc < 3) {
fprintf(stderr,"usage %s hostname port\n", argv[0]);
exit(0);
}
portno = atoi(argv[2]);
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0) {
error("ERROR opening socket");
}
bzero((char *) &serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = inet_addr(argv[1]);
serv_addr.sin_port = htons(portno);
if (connect(sockfd,(struct sockaddr *) &serv_addr,sizeof(serv_addr)) < 0) {
error("ERROR connecting");
}
printf("Please enter the message: ");
bzero(buffer,256);
fgets(buffer,255,stdin);
n = write(sockfd,buffer,strlen(buffer));
if (n < 0) {
error("ERROR writing to socket");
}
bzero(buffer,256);
n = read(sockfd,buffer,255);
if (n < 0) {
error("ERROR reading from socket");
}
printf("%s\n",buffer);
close(sockfd);
return 0;
}