获取本机的IP地址

[coolali]

在网上查找了一下，发现代码都很烦琐，不知哪位高手知道简单的方法或API
比较轻松获取本机的IP地址。

[SeainBlue]

gethostbyname

[SeainBlue]

char *GetLocalIP()
{
struct in_addr localaddr;
struct hostent *hp=NULL;
char hostname[50];
gethostname(hostname,49);//主机名
hp=gethostbyname(hostname);主机信息
memcpy(&localaddr,hp->h_addr,hp->length);//地址
return inet_ntoa(localaddr);//变成char *

}

[crs96321]

[程序实现]
假设你有了名为My的对话框工程.有一个按钮并有响应的程序:如OnButton1();
BOOL CListCtrl1Dlg::OnInitDialog()
{
CDialog::OnInitDialog();
AfxSocketInit(NULL);
//支持Socket.若在向导是没选Support Socket,这就的加.
//还要加#include <afxsock.h>在StdAfx.h中.

.......
// Add "About..." menu item to system menu.

// IDM_ABOUTBOX must be in the system command range.

// TODO: Add extra initialization here

return TRUE; // return TRUE unless you set the focus to a control
}

void CListCtrl1Dlg::OnButton1()
{
WORD wVersionRequested;
WSADATA wsaData;
char name[255];
CString ip;
PHOSTENT hostinfo;
wVersionRequested = MAKEWORD( 2, 0 );

if ( WSAStartup( wVersionRequested, &wsaData ) == 0 )
{

if( gethostname ( name, sizeof(name)) == 0)
{
if((hostinfo = gethostbyname(name)) != NULL)
{
ip = inet_ntoa (*(struct in_addr *)*hostinfo->h_addr_list);
}
}

WSACleanup( );
}
AfxMessageBox(name);//name里是本机名
AfxMessageBox(ip); //ip中是本机IP


这段代码应该是很简单详细了！

[Davidzhuhua]

BOOL Name2Ips(CString& strHostName,CUIntArray &aIp) //resolve a string ip or name to ip
{
aIp.RemoveAll();

LPHOSTENT lpstHost = NULL;
UINT nIp = inet_addr((LPCTSTR)strHostName);//is a IP address
if (nIp == INADDR_NONE)
{
lpstHost = gethostbyname((LPCTSTR)strHostName);//is a Name
if (!lpstHost)
return FALSE;
else
for(int i = 0; lpstHost!= NULL && lpstHost->h_addr_list[i]!= NULL; i++ )
aIp.Add(*(UINT *)lpstHost->h_addr_list[i]);
}
else
aIp.Add(nIp);
return TRUE;
}
UINT String2Ip(LPCTSTR szHost)
{
CUIntArray aIp;
if(Name2Ips(CString(szHost),aIp))
{
return aIp[0];
}
else
return 0;
}
CString Ip2String(UINT nIp)
{
if(!nIp)
return CString((LPCTSTR)NULL); //zero
char buff[16];
sprintf(buff,"%d.%d.%d.%d",nIp%256,nIp/256%256,nIp/256/256%256,nIp/256/256/256);
return CString(buff);
}