socket编程 - c 语言 socket ERR_CONNECTION_REFUSED

问题描述

问 题

下面的代码无法在浏览器下访问,什么原因？：
编译运行后应该输出html代码
localhost:8001

#include <stdio.h>
#include <stdlib.h>
#include <netdb.h>
#include <netinet/in.h>
#include <string.h>
void doprocessing (int sock);

int main( int argc, char *argv[] ) {
   int sockfd, newsockfd, portno, clilen;
   char buffer[256];
   struct sockaddr_in serv_addr, cli_addr;
   int n, pid;

   /* First call to socket() function */
   sockfd = socket(AF_INET, SOCK_STREAM, 0);

   if (sockfd < 0) {
      perror("ERROR opening socket");
      exit(1);
   }

   /* Initialize socket structure */
   bzero((char *) &serv_addr, sizeof(serv_addr));
   portno = 8001;

   serv_addr.sin_family = AF_INET;
   serv_addr.sin_addr.s_addr = INADDR_ANY;
   serv_addr.sin_port = htons(portno);

   //printf("FAMILY : %s,%s",AF_INET,INADDR_ANY);

   /* Now bind the host address using bind() call.*/
   if (bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
      perror("ERROR on binding");
      exit(1);
   }

   /* Now start listening for the clients, here
      * process will go in sleep mode and will wait
      * for the incoming connection
   */

   listen(sockfd,5);
   clilen = sizeof(cli_addr);

   //while (1) {
      newsockfd = accept(sockfd, (struct sockaddr *) &cli_addr, &clilen);

      if (newsockfd < 0) {
         perror("ERROR on accept");
         exit(1);
      }
     doprocessing(newsockfd);
   //} /* end of while */
}

void doprocessing (int sock) {
   int n;
   char buffer[256];
   bzero(buffer,256);
   n = read(sock,buffer,255);

   if (n < 0) {
      perror("ERROR reading from socket");
      exit(1);
   }

    printf("HTTP/1.1 200 Okay\r\nContent-Type: text/html; charset=ISO-8859-4 \r\n\r\n<h1>Hello, client! Welcome to the Virtual Machine Web..</h1>");
exit(1);

}

解决方案

n = read(sock,buffer,255);

socketfd和fd不是一回事吧……也许你需要先打开一个文件？或者你把recv和read记混了？

---

void doprocessing (int sock) {
    int n;
    char buffer[256];
    bzero(buffer,256);
    n = read(sock,buffer,255); // 这里你确定是read吗

    if (n < 0) {
        perror("ERROR reading from socket");
        exit(1);
    }

    const char *html = "HTTP/1.1 200 Okay\r\nContent-Type: text/html; charset=ISO-8859-4 \r\n\r\n<h1>Hello, client! Welcome to the Virtual Machine Web..</h1>";
    int htmlLen = strlen(html);
    printf(html); // 控制台
    send(sock, html, htmlLen , 0); // 浏览器，懒得加错误处理了
    exit(1);

}

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