winsock compiling error, it cant find the addrinfo structures and some relating functions

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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 star

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醉梦人生

2020-12-31 05:24

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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深忆病人

2020-12-31 05:31
I was able to get this to work with the following includes, pragma, and defines...
```
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdio.h>

#pragma comment(lib, "ws2_32.lib")
```
The list of necessary includes for this answer are shown in a Microsoft article: Winsock Includes
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日久生厌

2020-12-31 05:34

This is working for me:

#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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一向

2020-12-31 05:35

Beware! Your includes are wrong. The problem is that windows.h already includes winsock.h and winsock2.h then re-defines some structures and functions resulting in huge number of compilation errors. Move the windows.h include below the winsock2.h include, or just remove the windows.h include altogether, winsock2.h includes windows.h.

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花落未央

2020-12-31 05:44
MSDN says we should #include <ws2tcpip.h>, but in ws2tcpip.h i found this piece of code:
```
#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) */
```
this means, that _WIN32_WINNT is defined lower than _WIN32_WINNT_WINXP, but when i tried include wspiapi.h, i got "no such file or directory". My guess is, this is an fault of MinGW, where different parts of the library have inconsistent versions. You have to #define _WIN32_WINNT _WIN32_WINNT_WINXP on your own, before including ws2tcpip.h
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