如何在windows上使用getaddrinfo()

时间:2014-02-25 08:47:22

标签: c compilation winsock getaddrinfo

我试图使用mingw + msys构建我的APP。

我的代码使用winsock。当我编译它时,我收到以下错误消息:

$ gcc -o sample sample.c -lws2_32
    C:\Users\user\AppData\Local\Temp\ccsdWlQR.o:sample.c:(.text+0xeb): undefined reference to `getaddrinfo'
    collect2.exe: error: ld returned 1 exit status

这是我从Linux迁移的代码,更改了一些标题。

#include <stdio.h>
#include <WinSock2.h>
#include <WS2tcpip.h>

main(int argc,char *argv[])
{
    WSADATA wsaData;
    WSAStartup(MAKEWORD(2,2), &wsaData);

    printf("Hello world with winsock");

    int sock;
    char *hostAddress;
    struct addrinfo hints,*res;
    int err;
    memset(&hints,0,sizeof(hints));
    hints.ai_family = AF_UNSPEC; 
    hints.ai_socktype = SOCK_DGRAM;
    getaddrinfo("127.0.0.1",12345,&hints,&res);

    printf("getaddrinfo %s\n",strerror(errno));
    printf("getaddrinfo : %s \n",gai_strerror(err));


    struct sockaddr_in *addr;
    struct addrinfo *rp;
    for (rp = res; rp != NULL; rp = rp->ai_next) {
        addr = (struct sockaddr_in *)rp->ai_addr; 
        printf("dstPort  = %d\n",ntohs(addr->sin_port));
        printf("dstAddr  = %s\n",inet_ntoa((struct in_addr)addr->sin_addr));
        hostAddress = inet_ntoa((struct in_addr)addr->sin_addr);    
    }
    WSACleanup( );                                    

}

如何在Windows中使用gettarrinfo()

这是在尝试dgreenday的文章后更改邮件的其他信息。

sample.c:22:2: warning: passing argument 2 of 'getaddrinfo' makes pointer from i
nteger without a cast [enabled by default]
  getaddrinfo("124.0.0.1",12345,&hints,&res);
  ^
In file included from sample.c:4:0:
c:\mingw\include\ws2tcpip.h:391:12: note: expected 'const char *' but argument i
s of type 'int'
 int WSAAPI getaddrinfo (const char*,const char*,const struct addrinfo*,

1 个答案:

答案 0 :(得分:2)

我怀疑您只是拥有过时的SDK,而SDK中提供的导入库不包含getaddrinfo。你的程序编译方式就是你在我的mingw系统上描述链接的方式。

更新您的mingw系统,或创建包含getaddrinfo的导入库。

请注意:

getaddrinfo("124.0.0.1",12345,&hints,&res);

应该是:

getaddrinfo("124.0.0.1","12345",&hints,&res);

并且您没有正确检查错误。您必须注意getaddrinfo返回的值。忽略它然后继续检查errno

是不恰当的