Question

我正在编写一个程序来处理网络套接字而不是unix接口。我不确定它是否是头文件或函数和头文件的使用不正确。程序将向屏幕发送和打印消息，直到用户输入＆＃34;退出＆＃34;使用网络套接字。尝试编译此服务器会产生许多错误，即使我的客户端编译了一次。

...更新

错误（＆＃34;主要＆＃34;以及顶级错误）：

server02.c:37:5: error: 'server_socket' undeclared (first use in this   
function)

server02.c:37:5: note: each undeclared identifier is reported only once for 
each function it appears in

server02.c:41:26: error: 'struct sockaddr_in' has no member named 'sin_path'

server02.c:94:252: error: expected identifier or '(' before '}' token

server02.c:95:253: error: expected identifier or '(' before '}' token

server02.c:98:264: error: expected declaration specifiers or '...' before 
string constant

server02.c:99:259: warning: data definition has no type or storage class 
[enabled by default]

server02.c:99:259: warning: type defaults to 'int' in declaration of 'close' 
[enabled by default]

server02.c:99:259: warning: parameter names (without types) in function 
declaration [enabled by default]

server02.c:100:261: warning: data definition has no type or storage class 
[enabled by default]

server02.c:100:261: warning: type defaults to 'int' in declaration of 
'close' [enabled by default]

server02.c:100:261: warning: parameter names (without types) in function 
declaration [enabled by default]

server02.c:101:263: error: expected identifier or '(' before 'return'

server02.c:103:263: error: expected identifier or '(' before '}' token

服务器1的代码（客户端编译）...

#include <sys/types.h> 
#include <sys/socket.h>
#include <stdio.h>
#include <stdlib.h>
//#include <sys/un.h> //not needed anymore b/c in, not unix?
#include <unistd.h>
#include <string.h>
//ADDING THESE HELP, BUT STILL ERRORS
#include <netinet/in.h>
#include <netinet/ip.h>

#define PORT 50014
#define LEN 256
#define SOCKET_NAME "server_socket"

int main(void)
{
//some may not be needed
  char buf[LEN];
  int server_sockfd;
  int client_sockfd;
  socklen_t client_len;
  ssize_t num_client_bytes;
  struct sockaddr_in server_address;
  struct sockaddr_in client_address;

  //create new
  server_sockfd = socket(AF_INET, SOCK_STREAM, 0);

  if(-1 == server_sockfd)
    {
    perror("server -- socket failed");
            exit(EXIT_FAILURE);
    }

  //bind new
  memset(&server_address, 0, sizeof(server_address));
  server_address.sin_family = AF_INET;
  server_socket.sin_addr.s_addr = 0;
  server_address.sin_addr.s_addr = htonl(INADDR_ANY);
  server_address.sin_port = htons(PORT);

  strcpy(server_address.sun_path, SOCKET_NAME);//not sure if needed

  if(bind(server_sockfd, (struct sockaddr*)&server_address,
                                  sizeof(server_address)))
   {
    perror("server -- bind failed");
   }

 //create connection q and wait for client
  if(listen(server_sockfd, 5))
    {
     perror("server-- listen failed");
    }

  //announce server is waiting for client connection
  puts("server waiting...");

  //accept connection
  client_len = sizeof(client_address);
  client_sockfd = accept(server_sockfd, (struct sockaddr*)&client_address,
                                                            &client_len);

   //LOOP AND SEND MESSAGE HERE

  //close stuff
  close(client_sockfd);
  close(server_sockfd);
  return 0;
}

Answer 1

您错过了互联网套接字标题：

#include <netinet/in.h>
#include <netinet/ip.h>

Answer 2

添加

#include <netinet/in.h>

定义宏

时

#define a b

这意味着无论编译器在哪里看到它，它都应该用b代替。在您的代码中，您已经完成了类似的事情

#define SOCKET_NAME "server_socket"

但是什么是 server_socket ？可能你的意思是 server_address ，我在 #bind new 第3行

部分得到这个cus

server_socket.sin_addr.s_addr = 0;

这是正确的语法

server_address.sin_addr.s_addr = 0;

还修复了宏（ server_socket ？）

#define SOCKET_NAME "server_socket"

网络套接字程序中的顶级错误

2 个答案: