[急啊]socket问题，哪位朋友帮帮忙。在线等候，一有结果，立即结贴

[kitcaii]

实现一个socket简单通讯
编译出现了2个错误
e:\myC++\1.1\socket.cpp(30): error C2065: “BACKLOG” : 未声明的标识符
e:\myC++\1.1\socket.cpp(96): error C2065: “CLOSE_TRY_TIMES” : 未声明的标识符

请问是没有连接ws2_32.dll文件的原因吗，在vs.net2003中如何连接？

[脚跟着地]

包含了winsock.h没有？

[wfwsm]

#include<winsock2.h>
#param comment(lib, "Ws2_32.lib")

[过去的我]

socket肯定要连ws2_32.lib， 在编译选项的link 栏里

[wfwsm]

错了 改这个
#pragma comment(lib,"Ws2_32.lib")

[kitcaii]

//--------socket.h-----------

#include <iostream>
using std::string;
#include <string.h>
#include "errno.h"
#include "winsock2.h"
#pragma comment(lib,"Ws2_32.lib")
class Socket {
public:

 bool setup();

 void close();

 bool connect(string host, int port);

 bool listen();

 int accept();

 int recv(char *buf, int len);

 int recv(int new_fd, char *buf, int len);

 int send(const char *msg, int len);

 int send(int new_fd, const char *msg, int len);

private:
    int _fd;
};

//--------socket.cpp-----------

#include "socket.h"
bool Socket::setup() {

 WSADATA wsd;
 _fd = WSAStartup(MAKEWORD(2,2), &wsd);  
 if(_fd) {
  return false;
 }

 _fd = ::socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 if (_fd == -1) {
  return false;
 }
 return true;
}

bool Socket::listen() {
 struct sockaddr_in my_addr;
 
 my_addr.sin_family = AF_INET; 
 my_addr.sin_port = htons(52309);
 my_addr.sin_addr.s_addr = INADDR_ANY;
 
 if(::bind(_fd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)) == SOCKET_ERROR) {
  return false;
 }

 if(::listen(_fd,BACKLOG) == SOCKET_ERROR) {
  return false;
 }

 return true;
}

int Socket::accept()
{
 int new_fd;
 struct sockaddr_in their_addr;
 int sin_size = sizeof(their_addr);
 printf("accepting... \n");
 new_fd = ::accept(_fd, (struct sockaddr *)&their_addr, &sin_size);
 return new_fd == SOCKET_ERROR ? -1:new_fd;
}

bool Socket::connect(string host, int port){
 struct hostent *_h = gethostbyname(host.c_str());
 if (_h == 0) {
  return false;
 }

 struct in_addr *_addr = (struct in_addr *)_h->h_addr;
 struct sockaddr_in sin;
 sin.sin_family = AF_INET;
 sin.sin_addr = *_addr;
 sin.sin_port = htons(port);

 if (::connect(_fd, (sockaddr *)&sin, sizeof(sin)) == SOCKET_ERROR) {
  return false;
 }

 return true;
}

int Socket::recv(int new_fd, char *buf, int len)
{
 int nb = ::recv(new_fd, buf, len, 0);
 if (nb == -1) {
  printf("Error! recv.\n");
 }
 return nb;
}

int Socket::recv(char *buf, int len) {
 return recv(_fd, buf, len);
}

int Socket::send(const char *msg, int len) {
 return send(_fd, msg, len);
}

int Socket::send(int new_fd, const char *msg, int len)
{
 int nb = ::send(new_fd, msg, len, 0);
 if (nb == -1) {
  printf("Error! send.\n");
 }

 return nb;
}

void Socket::close() {

 int trytimes = 0;
 while(::closesocket(_fd) && trytimes < CLOSE_TRY_TIMES)
  trytimes++;

 if(trytimes == 10) {
  printf("Cannot close socket!\n");
 }
}

仍然是刚才2个错误啊
e:\myC++\1.1\socket.cpp(30): error C2065: “BACKLOG” : 未声明的标识符
e:\myC++\1.1\socket.cpp(96): error C2065: “CLOSE_TRY_TIMES” : 未声明的标识符

[IanFang]

自己定义个，例如：
#define BACKLOG 5
#define CLOSE_TRY_TIMES 10