讀取本機DNS資訊GetNetworkParams函數

//
// Link with IPHlpAPI.lib
//
#include <stdio.h>
#include <windows.h>
#include <iphlpapi.h>

#pragma comment(lib, "iphlpapi.lib")
int main()
{

    FIXED_INFO * FixedInfo;
    ULONG    ulOutBufLen;
    DWORD    dwRetVal;
    IP_ADDR_STRING * pIPAddr;

    FixedInfo = (FIXED_INFO *) GlobalAlloc( GPTR, sizeof( FIXED_INFO ) );
    ulOutBufLen = sizeof( FIXED_INFO );

    if( ERROR_BUFFER_OVERFLOW == GetNetworkParams( FixedInfo, &ulOutBufLen ) ) {
        GlobalFree( FixedInfo );
        FixedInfo = (FIXED_INFO *)GlobalAlloc( GPTR, ulOutBufLen );
    }

    if ( dwRetVal = GetNetworkParams( FixedInfo, &ulOutBufLen ) ) {
        printf( "Call to GetNetworkParams failed. Return Value: %08x\n", dwRetVal );
    }
    else {
        printf( "Host Name: %s\n", FixedInfo -> HostName );
        printf( "Domain Name: %s\n", FixedInfo -> DomainName );

        printf( "DNS Servers:\n" );
        printf( "\t%s\n", FixedInfo -> DnsServerList.IpAddress.String );

        pIPAddr = FixedInfo -> DnsServerList.Next;
        while ( pIPAddr ) {
            printf( "\t%s\n", pIPAddr ->IpAddress.String );
            pIPAddr = pIPAddr ->Next;
        }
    }
    exit( 0 );
}