winsock编译错误，它找不到addrinfo结构和一些相关的函数

问题描述

我刚刚开始学习winsock通过Beej的网络编程指南书。我在windows下编程，并通过gcc运行它。这只是一个开始写我的第一个服务器程序，但它给我这些错误，当我尝试编译。

  / *服务器* / 
 #include< iostream> 
 #include< windows.h> 
 #include< winsock2.h> 
 using namespace std; 
 
 const int winsockVersion = 2; 
 #define BACKLOG 10 
 #define PORT 3000 
 
 
 int main（void）{
 
 WSADATA wsadata; 
 if（WSAStartup（MAKEWORD（winsockVersion，0），& wsadata）== 0）{
 
 
 struct addrinfo hints，* res; 
 
 memset（& hints，0，sizeof hints）; 
 hints.ai_family = AF_INET; 
 hints.ai_socktype = SOCK_STREAM; 
 hints.ai_flags = AI_PASSIVE; 
 
 if（getaddrinfo（NULL，PORT，&hints，& res）== 0）{
 cout<< - 调用addrinfo成功！ << endl; 
} 
 
 cout<<res af_family< res-> ai_family<< endl; 
} 
 
 
 
 
 //清除东西
 if（WSACleanup（）！= 0）{
 cout< ; -  WSACleanup unsuccessful<< endl; 
} else {
 cout<< -  WSACleanup successful< endl; 
} 
 
 
 return 0; 
} 
  

这些是我收到的错误

  g ++ -o server.exe server.cpp -lws2_32 
进程已启动>>> 
 server.cpp：在函数`int main（）'：
 server.cpp：20：error：aggregate`addrinfo hints'有不完整的类型，不能定义
 server.cpp：25 ：错误：`AI_PASSIVE'未在此范围中声明
 server.cpp：27：错误：`getaddrinfo'未在此范围中声明
 server.cpp：31：error：invalid use of undefined type `struct addrinfo'
 server.cpp：20：错误：`struct addrinfo'的向前声明
 server.cpp：54：2：warning：文件末尾没有换行符
< ;&过程完成。 
  

不应该在windows.h或winsock.h中定义结构和函数。 / p>

解决方案

strong>
给任何绊倒这个的人，添加

  #define _WIN32_WINNT 0x501 
 #include< ws2tcpip.h>如果getaddrinfo表示其未声明，则
  

。

解决方案

您可能想要 #include< ws2tcpip.h> 。请注意，在Stack Overflow之前，是您的朋友的问题：您将从MSDN立即得到答案！

I've just started learning winsock through the "Beej's guide to network programming" book. I'm programming under windows and running it through gcc. This is just a start to writing my first server program but it gives me these errors when I try to compile.

/* Server */
#include <iostream>
#include <windows.h>
#include <winsock2.h>
using namespace std;

const int winsockVersion = 2;
#define BACKLOG 10
#define PORT 3000


int main(void){

    WSADATA wsadata;
    if (WSAStartup(MAKEWORD(winsockVersion,0),&wsadata) == 0){


        struct addrinfo hints, *res;

        memset(&hints,0,sizeof hints);
        hints.ai_family = AF_INET;
        hints.ai_socktype = SOCK_STREAM;
        hints.ai_flags = AI_PASSIVE;

        if ( getaddrinfo(NULL,PORT,&hints,&res) == 0 ){
            cout<<"-Call to get addrinfo successful!." << endl;
        }

        cout<<"res af_family" << res->ai_family << endl;
    }




    //clear stuff
    if( WSACleanup() != 0){
        cout<<"-WSACleanup unsuccessful" << endl;
    }else{
        cout<<"-WSACleanup successful" << endl;
    }


    return 0;
}

these are the errors I'm receiving

g++ -o server.exe server.cpp -lws2_32
Process started >>>
server.cpp: In function `int main()':
server.cpp:20: error: aggregate `addrinfo hints' has incomplete type and cannot be defined
server.cpp:25: error: `AI_PASSIVE' was not declared in this scope
server.cpp:27: error: `getaddrinfo' was not declared in this scope
server.cpp:31: error: invalid use of undefined type `struct addrinfo'
server.cpp:20: error: forward declaration of `struct addrinfo'
server.cpp:54:2: warning: no newline at end of file
<<< Process finished.

Shouldn't the structures and functions be defined in either windows.h or winsock.h?.

SOLUTION

EDITto anyone who stumbles on this, add

#define _WIN32_WINNT 0x501
#include <ws2tcpip.h>

at the top of your source if getaddrinfo says that its undeclared.

解决方案

You probably want to #include <ws2tcpip.h>. Remember that before Stack Overflow, Google is your friend for this kind of questions : you will get immediate answers from MSDN !

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