gcc winsock编译错误，它找不到addrinfo结构和一些相关函数

57hvy0tb 于 2023-01-05 发布在其他

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我刚开始通过“Beej's guide to network programming”这本书学习winsock，我在windows下编程，并通过gcc运行它，这只是我第一次编写服务器程序的开始，但当我试图编译时，它给了我这些错误。

/* 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;
}

这些是我收到的错误

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.

结构和函数不应该在windows.h或winsock.h中定义吗？

解决方案
EDIT对于任何无意中发现此内容的人，请添加

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

如果getaddrinfo说它是未声明的，那么在源代码的顶部。

gcc

来源：https://stackoverflow.com/questions/4243027/winsock-compiling-error-it-cant-find-the-addrinfo-structures-and-some-relating

6条答案

按热度按时间

uajslkp61#

你可能想#include <ws2tcpip.h>.记住在Stack Overflow之前，Google是你解决这类问题的朋友：您将立即从MSDN获得答案！

赞(0）回复(0）举报 2023-01-05

niwlg2el2#

MSDN说我们应该#include <ws2tcpip.h>，但在ws2tcpip.h中我发现了这段代码：

#if (_WIN32_WINNT >= _WIN32_WINNT_WINXP)
/**
 * For WIN2K the user includes wspiapi.h for these functions.
 */
void WSAAPI freeaddrinfo (struct addrinfo*);
int WSAAPI getaddrinfo (const char*,const char*,const struct addrinfo*,
                struct addrinfo**);
int WSAAPI getnameinfo(const struct sockaddr*,socklen_t,char*,DWORD,
           char*,DWORD,int);
#endif /* (_WIN32_WINNT >= _WIN32_WINNT_WINXP) */

这意味着，_WIN32_WINNT的定义比_WIN32_WINNT_WINXP低，但是当我尝试包含wspiapi.h时，我得到了"no such file or directory"。我猜，这是MinGW的错误，库的不同部分有不一致的版本。在包含ws2tcpip.h之前，你必须自己定义#define _WIN32_WINNT _WIN32_WINNT_WINXP

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vfh0ocws3#

**注意！**您的包含错误。问题是windows.h已经包含winsock.h和winsock2.h，然后重新定义了一些结构和函数，导致大量编译错误。将windows.h包含移动到winsock2.h包含下面，或者只是完全删除windows.h包含，winsock2.h包含windows.h。

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uoifb46i4#

我能够让它与下面的包含、杂注和定义一起工作...

#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdio.h>

#pragma comment(lib, "ws2_32.lib")

此答案的必要包含列表显示在Microsoft文章中：Winsock Includes

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jyztefdp5#

这对我很有效：

#include <winsock2.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#define DEFAULT_PORT 80

void error_die(const char *s)
{
    fprintf(stderr, "Error: %s failed with error %d\n", s, WSAGetLastError());
    WSACleanup();
    exit(EXIT_FAILURE);
}

int main(int argc, char **argv)
{
    char response[] = "HTTP/1.1 200 OK\r\n"
    "Content-Type: text/html; charset=UTF-8\r\n\r\n"
    "<!DOCTYPE html><html><head><title>Hello World</title></head>"
    "<body><h1>Hello world!</h1></body></html>\r\n";

    char buf[4096];
    int msg_len, addr_len;
    struct sockaddr_in local, client_addr;

    SOCKET sock, msg_sock;
    WSADATA wsaData;

    if (WSAStartup(MAKEWORD(2, 2), &wsaData) == SOCKET_ERROR)
    {
        fprintf(stderr, "WSAStartup failed with error %d\n", WSAGetLastError());
        WSACleanup();
        return -1;
    }

    // Fill in the address structure
    local.sin_family        = AF_INET;
    local.sin_addr.s_addr   = INADDR_ANY;
    local.sin_port          = htons(DEFAULT_PORT);

    sock = socket(AF_INET, SOCK_STREAM, 0);  //TCP socket

    if (sock == INVALID_SOCKET)
        error_die("socket()");

    if (bind(sock, (struct sockaddr *)&local, sizeof(local)) == SOCKET_ERROR)
        error_die("bind()");

    if (listen(sock, 5) == SOCKET_ERROR)   // wait for connection
        error_die("listen()");

    printf("Waiting for connection...\n");

    while (1)
    {
        addr_len = sizeof(client_addr);
        msg_sock = accept(sock, (struct sockaddr*)&client_addr, &addr_len);

        if (msg_sock == INVALID_SOCKET || msg_sock == -1)
            error_die("accept()");

        printf("Accepted connection from %s, port %d\n", inet_ntoa(client_addr.sin_addr), htons(client_addr.sin_port));

        msg_len = recv(msg_sock, buf, sizeof(buf), 0);

        printf("Bytes Received: %d, message: %s from %s\n", msg_len, buf, inet_ntoa(client_addr.sin_addr));

        msg_len = send(msg_sock, response, sizeof(response)-1 , 0);

        if (msg_len == SOCKET_ERROR)
            error_die("send()");

        if (!msg_len)
        {
            printf("Client closed connection\n");
            closesocket(msg_sock);
            WSACleanup();
            return -1;
        }

        closesocket(msg_sock);
    }

    WSACleanup();
}

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oknwwptz6#

在我的例子中，我在声明sockaddr_in时添加了struct。
变更日期：
sockaddr_in m_sockAddr;
到
struct sockaddr_in m_sockAddr;
而且，
bind(sock, (sockaddr*)&m_sockAddr, sizeof(m_sockAddrLsng ))
到
bind(m_sockLsng, (struct sockaddr*)&m_sockAddr, sizeof(m_sockAddr))

赞(0）回复(0）举报 2023-01-05

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gcc winsock编译错误，它找不到addrinfo结构和一些相关函数

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