mingw中的套接字编程

我在Visual Studio中编写了一个服务器/客户端C++代码并进行了测试，一切正常，但我想转换为CodeBlocks MinGW（Gnu CC编译器），它会返回一些错误，比如：

警告：忽略#pragma comment[-Wunknown pragmas]

错误：未在此作用域|中声明"getaddrinfo"

错误：未在此作用域|中声明"freeaddrinfo"

我的服务器代码：

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

#pragma comment (lib, "Ws2_32.lib")
#define DEFAULT_BUFLEN 512
#define DEFAULT_PORT "27015"
int __cdecl main(void)
{
    WSADATA wsaData;
    int iResult;
    SOCKET ListenSocket = INVALID_SOCKET;
    SOCKET ClientSocket = INVALID_SOCKET;
    struct addrinfo *result = NULL;
    struct addrinfo hints;
    int iSendResult;
    char recvbuf[DEFAULT_BUFLEN];
    int recvbuflen = DEFAULT_BUFLEN;

    iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
    if (iResult != 0) {
        printf("WSAStartup failed with error: %dn", iResult);
        return 1;
    }
    ZeroMemory(&hints, sizeof(hints));
    hints.ai_family = AF_INET;
    hints.ai_socktype = SOCK_STREAM;
    hints.ai_protocol = IPPROTO_TCP;
    hints.ai_flags = AI_PASSIVE;

    iResult = getaddrinfo(NULL, DEFAULT_PORT, &hints, &result);
    if ( iResult != 0 ) {
        printf("getaddrinfo failed with error: %dn", iResult);
        WSACleanup();
        return 1;
    }

    ListenSocket = socket(result->ai_family, result->ai_socktype, result->ai_protocol);
    if (ListenSocket == INVALID_SOCKET) {
        printf("socket failed with error: %in", WSAGetLastError());
        freeaddrinfo(result);
        WSACleanup();
        return 1;
    }

    iResult = bind( ListenSocket, result->ai_addr, (int)result->ai_addrlen);
    if (iResult == SOCKET_ERROR) {
        printf("bind failed with error: %dn", WSAGetLastError());
        freeaddrinfo(result);
        closesocket(ListenSocket);
        WSACleanup();
        return 1;
    }
    freeaddrinfo(result);
    iResult = listen(ListenSocket, SOMAXCONN);
    if (iResult == SOCKET_ERROR) {
        printf("listen failed with error: %dn", WSAGetLastError());
        closesocket(ListenSocket);
        WSACleanup();
        return 1;
    }

    ClientSocket = accept(ListenSocket, NULL, NULL);
    if (ClientSocket == INVALID_SOCKET) {
        printf("accept failed with error: %dn", WSAGetLastError());
        closesocket(ListenSocket);
        WSACleanup();
        return 1;
    }

    closesocket(ListenSocket);

    do {
        iResult = recv(ClientSocket, recvbuf, recvbuflen, 0);
        if (iResult > 0) {
            printf("Bytes received: %dn", iResult);

            iSendResult = send( ClientSocket, recvbuf, iResult, 0 );
            if (iSendResult == SOCKET_ERROR) {
                printf("send failed with error: %dn", WSAGetLastError());
                closesocket(ClientSocket);
                WSACleanup();
                return 1;
            }
            printf("Bytes sent: %dn", iSendResult);
        }
        else if (iResult == 0)
            printf("Connection closing...n");
        else  {
            printf("recv failed with error: %dn", WSAGetLastError());
            closesocket(ClientSocket);
            WSACleanup();
            return 1;
        }
    } while (iResult > 0);

    iResult = shutdown(ClientSocket, SD_SEND);
    if (iResult == SOCKET_ERROR) {
        printf("shutdown failed with error: %dn", WSAGetLastError());
        closesocket(ClientSocket);
        WSACleanup();
        return 1;
    }

    closesocket(ClientSocket);
    WSACleanup();
    return 0;
}

我的客户代码：

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

#pragma comment (lib, "Ws2_32.lib")
#pragma comment (lib, "Mswsock.lib")
#pragma comment (lib, "AdvApi32.lib")

#define DEFAULT_BUFLEN 512
#define DEFAULT_PORT "27015"
int __cdecl main(int argc, char **argv)
{
    WSADATA wsaData;
    SOCKET ConnectSocket = INVALID_SOCKET;
    struct addrinfo *result = NULL,
                    *ptr = NULL,
                    hints;
    char *sendbuf = "this is a test";
    char recvbuf[DEFAULT_BUFLEN];
    int iResult;
    int recvbuflen = DEFAULT_BUFLEN;

    if (argc != 2) {
        printf("usage: %s server-namen", argv[0]);
        return 1;
    }

    iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
    if (iResult != 0) {
        printf("WSAStartup failed with error: %dn", iResult);
        return 1;
    }
    ZeroMemory( &hints, sizeof(hints) );
    hints.ai_family = AF_UNSPEC;
    hints.ai_socktype = SOCK_STREAM;
    hints.ai_protocol = IPPROTO_TCP;

    iResult = getaddrinfo(argv[1], DEFAULT_PORT, &hints, &result);
    if ( iResult != 0 ) {
        printf("getaddrinfo failed with error: %dn", iResult);
        WSACleanup();
        return 1;
    }

    for(ptr=result; ptr != NULL ;ptr=ptr->ai_next) {

        ConnectSocket = socket(ptr->ai_family, ptr->ai_socktype,
            ptr->ai_protocol);
        if (ConnectSocket == INVALID_SOCKET) {
            printf("socket failed with error: %ldn", WSAGetLastError());
            WSACleanup();
            return 1;
        }

        iResult = connect( ConnectSocket, ptr->ai_addr, (int)ptr->ai_addrlen);
        if (iResult == SOCKET_ERROR) {
            closesocket(ConnectSocket);
            ConnectSocket = INVALID_SOCKET;
            continue;
        }
        break;
    }
    freeaddrinfo(result);
    if (ConnectSocket == INVALID_SOCKET) {
        printf("Unable to connect to server!n");
        WSACleanup();
        return 1;
    }

    iResult = send( ConnectSocket, sendbuf, (int)strlen(sendbuf), 0 );
    if (iResult == SOCKET_ERROR) {
        printf("send failed with error: %dn", WSAGetLastError());
        closesocket(ConnectSocket);
        WSACleanup();
        return 1;
    }
    printf("Bytes Sent: %in", iResult);

    iResult = shutdown(ConnectSocket, SD_SEND);
    if (iResult == SOCKET_ERROR) {
        printf("shutdown failed with error: %dn", WSAGetLastError());
        closesocket(ConnectSocket);
        WSACleanup();
        return 1;
    }

    do {
        iResult = recv(ConnectSocket, recvbuf, recvbuflen, 0);
        if ( iResult > 0 )
            printf("Bytes received: %dn", iResult);
        else if ( iResult == 0 )
            printf("Connection closedn");
        else
            printf("recv failed with error: %dn", WSAGetLastError());
    } while( iResult > 0 );

    closesocket(ConnectSocket);
    WSACleanup();
    return 0;
}

有人能帮我吗？