C++INET菜鸟，我做错了什么

#include <iostream>
#include <stdlib.h>
#include <stdio.h>
#include <netinet/in.h>
#include <netdb.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <string.h>
#include <cstdio>
using namespace std;
int main(int argc, char *argv[])
{
  int port, n,sockfd;
  struct sockaddr_in srv_addr;
  struct hostent *serv;
  char buffer[256];
  if(argc<3)
  {
    cout <<"n ussage: host portnexitingn";
    return 0;
  }
  port=atoi(argv[2]);
  sockfd=socket(AF_INET, SOCK_STREAM, 0);
  if (sockfd < 0)
  {
    cout <<"nsocket creation on"<<port<<" failednexitingncheck to see if port is in use";
    return 0;
  }
  serv = gethostbyname(argv[1]);
  if (serv=NULL)
  {
    cout <<"n"<<serv<<" is not a valid host namenexiting";
    return 0;
  }
  bzero((char *) &srv_addr, sizeof(srv_addr));
  srv_addr.sin_family=AF_INET;
  bcopy((char *) serv->h_addr, 
        (char *) &srv_addr.sin_addr.s_addr,
                 serv->h_length);
  srv_addr.sin_port=htons(port); 
  if (connect(sockfd,&srv_addr,
               sizeof (srv_addr))<0)
  {
    cout <<" nconnection failedn";
  }
  cout <<"nType messagen";
  bzero(buffer, 256);
  cin.getline(buffer,256);
  n=write(sockfd,buffer,strlen(buffer));
  if (n>0)
  {
    cout <<"nsocket write errornexitingn";
  }
  n=read(sockfd,buffer,255);

  if (n>0)
  {
    cout <<"nsocket read errornexitingn";
  }           
  cout <<buffer;
  return 0;
}

编译时，我收到此错误：

fg.c: In function ‘int main(int, char**)’:
fg.c:53:33: error: cannot convert ‘sockaddr_in*’ to ‘const sockaddr*’ for argument ‘2’ to ‘int connect(int, const sockaddr*, socklen_t)’

我想不通。我是编程的菜鸟。任何帮助都是感激的。