unit1.cpp

获得本机IP地址的例子程序源码.

//---------------------------------------------------------------------------

#include <vcl.h>
#pragma hdrstop
#include <WINSOCK2.H>
#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
void TForm1::GetHostIpAddress() //获得IP地址
{
 struct hostent *thisHost;
 struct in_addr in;
 char MyName[80];
 char *hostname,*ptr;

 WORD wVersionRequested;
 WSADATA wsaData;
 int err;
 wVersionRequested = MAKEWORD( 2, 0 );
 err = WSAStartup( wVersionRequested, &wsaData );
 if( err != 0 )
   return;


 if(LOBYTE( wsaData.wVersion ) != 2 ||
    HIBYTE( wsaData.wVersion ) != 0 )
   {
    WSACleanup( );
    return;
  }

 if(gethostname(MyName,80)==SOCKET_ERROR)
   return;

 if(!(thisHost=gethostbyname(MyName)))
   return;
 memset((void *)&in,sizeof(in),0);
 hostname=thisHost->h_name;
 in.s_addr=*((unsigned long *)thisHost->h_addr_list[0]);
 if(!(ptr=inet_ntoa(in)))
   return;
 WSACleanup( );
 Edit1->Text=AnsiString(ptr);
 Edit2->Text=AnsiString(hostname);
}
//---------------------------------------------------------------------------

void __fastcall TForm1::FormCreate(TObject *Sender)
{
 GetHostIpAddress();        
}
//---------------------------------------------------------------------------