主机地址查询程序的gethostbyaddr无法得到主机名，求解各位大虾

[watersonsun]

源代码如下
#include "stdafx.h"
#include "string.h"
#include <winsock.h>
#define PROG_NAME "DNS Lookup"
#define HOST_NAME "PC127"
#define WINSOCK_VERSION 0x0101
#define PF_INET_LENGTH 4
#define HOST_ADDR "192.168.0.37"
int PASCAL WinMain(HINSTANCE hInstance,HINSTANCE hPreyInstance,LPSTR lpszCmdParam,int nCmdShow)
{
WSADATA wsaData;
LPHOSTENT lpHostEnt;
DWORD dwIPAddr;
LPSTR szIPAddr;

if (WSAStartup(WINSOCK_VERSION,&wsaData))
MessageBox(NULL,"Could not load Windows Sockets DLL.",PROG_NAME,MB_OK|MB_ICONSTOP);
else
{
lpHostEnt=gethostbyname(HOST_NAME);
if(!lpHostEnt)
MessageBox(NULL,"Could not get IP address!",HOST_NAME, MB_OK|MB_ICONSTOP);
else
{
szIPAddr=inet_ntoa(*(LPIN_ADDR)*(lpHostEnt->h_addr_list));
MessageBox(NULL,szIPAddr,lpHostEnt->h_name,MB_OK|MB_ICONINFORMATION);
}

dwIPAddr=inet_addr(HOST_ADDR);
if(dwIPAddr==INADDR_NONE)
MessageBox(NULL,"Invalid Internet address!",HOST_ADDR,MB_OK|MB_ICONSTOP);

else
{
lpHostEnt=gethostbyaddr((LPSTR)&dwIPAddr,PF_INET_LENGTH,AF_INET);
if (lpHostEnt==NULL)
MessageBox(NULL,"Could not get host name!",HOST_ADDR,MB_OK|MB_ICONSTOP);
else MessageBox(NULL,"done",HOST_ADDR,MB_OK|MB_ICONSTOP);
}
}


WSACleanup();
return(NULL);
}
运行后
gethostbyname可以得到结果
但是gethostbyaddr总是得不到主机名
不得其解啊>_<

[watersonsun]

额 自己顶自己了..

[waizqfor]

睡觉了 帮你顶一下