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c++builder 2010 怎样获取本机的外网IP ? 本机连在了交换机局域网下。C++Builder6的代码如下：
//---------------------------------------------------------------------------#include <vcl.h>
#pragma hdrstop#include "Unit1.h"
#include "urlmon.h"
#include "stdio.h"
#pragma link "D:\\Program Files\\Borland\\CBuilder6\\Lib\\Psdk\\urlmon.lib"//此处根据你的实际情况修改
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner): TForm(Owner)
{
}
//---------------------------------------------------------------------------void __fastcall TForm1::Button1Click(TObject *Sender)
{int APIENTRY WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow);{char buf[MAX_PATH] = {0};char chTempIp[128];char chIP[64];URLDownloadToFile(0,"http://www.ip138.com/ip2city.asp","IPinTheWorld.ini",0,NULL);FILE *fp=fopen( "IPinTheWorld.ini", "r" );if ( fp != NULL ){fseek(fp, 0, SEEK_SET);fread(buf,1,256,fp);fclose(fp);char* iIndex = strstr(buf,"[");if (iIndex){sprintf( chTempIp,"%s",iIndex);int nBuflen = strlen(chTempIp);for (int i =0; i<nBuflen; i++){chIP[i] = chTempIp[i+1];if (chTempIp[i] == ']'){chIP[i-1] = '\0';DeleteFile("IPinTheWorld.ini");continue;}}}}MessageBox(NULL, chIP,chIP,0);}
}
//--------------------------------------------------------------------------- 参考：http://blog.csdn.net/hacksouls/article/details/3511762
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