function IsOnline:boolean; var dwFlags: DWORD; begin dwFlags := INTERNET_CONNECTION_MODEM + INTERNET_CONNECTION_LAN + INTERNET_CONNECTION_PROXY ; //取得网络连接状态 result := InternetGetConnectedState(@dwFlags, 0); end;procedure TForm1.Button1Click(Sender: TObject); begin if IsOnline then ShowMessage('Network is online.') else ShowMessage('Network is not online.'); end;
procedure TForm1.Button1Click(Sender: TObject); begin if GetSystemMetrics(SM_NETWORK) AND $01 = $01 then ShowMessage('您的机器连接到了互联网上') else ShowMessage('您的机器没有连接到互联网上'); end;
var
dwFlags: DWORD;
begin
dwFlags := INTERNET_CONNECTION_MODEM + INTERNET_CONNECTION_LAN + INTERNET_CONNECTION_PROXY ;
//取得网络连接状态
result := InternetGetConnectedState(@dwFlags, 0);
end;procedure TForm1.Button1Click(Sender: TObject);
begin
if IsOnline then
ShowMessage('Network is online.')
else
ShowMessage('Network is not online.');
end;
begin
if GetSystemMetrics(SM_NETWORK) AND $01 = $01 then
ShowMessage('您的机器连接到了互联网上')
else
ShowMessage('您的机器没有连接到互联网上');
end;
何为WAN? 何为LAN? 你的电脑直接连在WAN上就是WAN, 其它的都是LAN? 通过IP判断吧...如果本机IP是192.160.X.X, 你可以认为是LAN(当然不只这些, 但能包含大多数情况了)
showmessage('可以访问互联网') else showmessage('不可访问互联网');