获取IP地址问题

[org200820082008]

HOSTENT *pHOSTENT;
char name[255];
gethostname(name,sizeof(name));
pHOSTENT=gethostbyname(name);
m_strLocalName=pHOSTENT->h_name;
m_strLocalIP = inet_ntoa(*(struct in_addr*)*pHOSTENT->h_addr_list);

以上代码，为什么在获取计算机名称和IP地址时总是出现异常错误。

[jxb_memory]

// 程序功能：取出本机的所有IP，保存为一个字符串列表

// 作者：someone(阿风)

// windows xp + sp2 , vc6 + sp5编译通过

//

#include

using std::cin;

using std::cout;

using std::cerr;

using std::endl;

#include

using std::list;

#include

using std::string;

#include

#pragma comment( lib, "ws2_32.lib" )

bool GetIpList( list r_iplist )

{

WORD wVersionRequested;

WSADATA wsaData;

int err;

wVersionRequested = MAKEWORD( 2, 2 );

err = WSAStartup( wVersionRequested, &wsaData );

if ( err != 0 )

{

cout < < "WSAStartup failed !" < < endl;

return false;

}

char szhn[256];

int nStatus = gethostname(szhn, sizeof(szhn));

if (nStatus == SOCKET_ERROR )

{

cout < < "gethostname failed, Error code: " < < WSAGetLastError() < < endl;

return false;

}

HOSTENT *host = gethostbyname(szhn);

if (host != NULL)

{

for ( int i=0; ; i++ )

{

r_iplist.push_back( inet_ntoa( *(IN_ADDR*)host-> h_addr_list[i] ) ) ;

if ( host-> h_addr_list[i] + host-> h_length > = host-> h_name )

break;

}

}

WSACleanup();

return true;

}

int main(int argc, char *argv[])

{

list iplist;

std::list ::iterator ip;

if ( !GetIpList( iplist ) )

{

cout < < "Get ip list failed !" < < endl;

return -1;

}

cout < < "IP list :" < < endl;

for ( ip = iplist.begin(); ip != iplist.end(); ip++ )

{

cout < < " " < < *ip < < endl;

}

return 0;

}

[rockq7q7vip]

LPHOSTENT lphostent;
lphostent=gethostbyname("www.baidu.com");
if(!lphostent)
{
AfxMessageBox("error");
return;
}
else
{

LPSTR szIPAddr;
szIPAddr=inet_ntoa(*(LPIN_ADDR)*(lphostent->h_addr_list));
AfxMessageBox(szIPAddr);
}

[糊里糊涂]

HOSTENT *pHOSTENT = gethostbyname(name);
如果分开写，那么就要先对pHOSTENT初始化

[shuzu8]

顶。我也想知道怎么获取这东西

[Win32Coder]

gethostname(name,sizeof(name));
怎么没检查返回 值 呢？错误的话用WSAGetLastError（）查看一下。
估计楼主没有 初始化吧。 没有调用 WSAStartup().

gethostname()

lasterror:

WSAEFAULT The name parameter is not a valid part of the user address space, or the buffer size specified by the namelen parameter is too small to
hold the complete host name.
WSANOTINITIALISED A successful WSAStartup call must occur before using this function.
WSAENETDOWN The network subsystem has failed.
WSAEINPROGRESS A blocking Winsock call is in progress, or the service provider is still processing a callback function.

Remarks

[caitian6]

楼上说的很清楚啦