链接器错误使用gns [duplicate]使用windns.h编译代码

Question

这个问题在这里已有答案：

• What is an undefined reference/unresolved external symbol error and how do I fix it? 33回答

我试图在C中执行一个简单的DNS查找。这是我的代码（我主要从一个例子中解释）：

#include <winsock2.h>
#include <windns.h>
#include <stdio.h>

char* DNS_Lookup(char* host) {
    DNS_STATUS status;               //Return value of  DnsQuery_A() function.
    PDNS_RECORD pDnsRecord;          //Pointer to DNS_RECORD structure.
    PIP4_ARRAY pSrvList = NULL;      //Pointer to IP4_ARRAY structure.
    WORD wType;                      //Type of the record to be queried.
    char* pOwnerName = host;         //Owner name to be queried.
    char pReversedIP[255];           //Reversed IP address.
    char DnsServIp[255];             //DNS server ip address.
    DNS_FREE_TYPE freetype;
    freetype = DnsFreeRecordList;// DnsFreeRecordListDeep;
    IN_ADDR ipaddr;

    status = DnsQuery(pOwnerName,                 //Pointer to OwnerName. 
                        wType,                      //Type of the record to be queried.
                        DNS_QUERY_BYPASS_CACHE,     // Bypasses the resolver cache on the lookup. 
                        pSrvList,                   //Contains DNS server IP address.
                        &pDnsRecord,                //Resource record that contains the response.
                        NULL);                     //Reserved for future use.
    if(status) {
        printf("Failed to query the host record for %s and the error is %d \n", pOwnerName, status);
    } else {
        ipaddr.S_un.S_addr = (pDnsRecord->Data.A.IpAddress);
        printf("The IP address of the host %s is %s \n", pOwnerName,inet_ntoa(ipaddr));

        // Free memory allocated for DNS records. 
        DnsRecordListFree(pDnsRecord, freetype);
    }
    LocalFree(pSrvList);
    return inet_ntoa(ipaddr);
}

当我尝试编译时，我会收到链接器错误（为了清晰起见，我已经清理了一些错误）：

gcc -g main.c dns.c -o build.exe -D WIN -lws2_32 -w
c:/<..>/mingw32/bin/ld.exe: <..>/ccRVIgMi.o: in function `Z10DNS_LookupPc':
../dns.c:17: undefined reference to `DnsQuery_A@24'
c:/<..>/mingw32/bin/ld.exe: <..>/dns.c:30: undefined reference to `DnsRecordListFree@8'
collect2.exe: error: ld returned 1 exit status

我知道为了使用winsock2.h编译代码我必须将-lws2_32添加到我的gcc命令，我猜我必须做类似的编译代码使用windns.h，但我一直无法在网上找到任何帮助。

Answer 1

应该是正确的答案

 gcc -g main.c dns.c -o build.exe -D WIN -lws2_32 -ldnsapi -w

但正如你发现它不起作用。值得庆幸的是，gcc非常聪明，可以提供一种恢复方式：

 gcc -g main.c dns.c -o build.exe -D WIN -lws2_32 -ldnsapi.dll -w

如果由于某些原因无效并且您在Windows上编译而不是交叉编译，这将起作用：

 gcc -g main.c dns.c -o build.exe -D WIN -lws2_32 -lc:\windows\system32\dnsapi.dll -w