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Unit1.cpp：源码内容

							//---------------------------------------------------------------------------
#include <vcl.h>
#pragma hdrstop
#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button1Click(TObject *Sender)
{
  if(GetSystemMetrics(SM_NETWORK)&0x01==0x01)
  {
    ShowMessage("网络已存在");
  }
  else
  {
    ShowMessage("未联网");
  }
}
//---------------------------------------------------------------------------

						