Embarcadero Delphi – Get Internet Connection Type

Posted on January 5, 2017 By David Kittell

unit Unit1;
 
interface
 
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, WinInet;
 
type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
 
var
  Form1: TForm1;
 
implementation
 
const
  MODEM = 1;
  LAN = 2;
  PROXY = 4;
  BUSY = 8;
 
function GetConnectionKind(var strKind: string): Boolean;
var
  flags: DWORD;
begin
  strKind := '';
  Result := InternetGetConnectedState(@flags, 0);
  if Result then
  begin
    if (flags and MODEM) = MODEM then strKind := 'Modem';
    if (flags and LAN) = LAN then strKind := 'LAN';
    if (flags and PROXY) = PROXY then strKind := 'Proxy';
    if (flags and BUSY) = BUSY then strKind := 'Modem Busy';
  end;
end;
 
{$R *.dfm}
 
procedure TForm1.FormCreate(Sender: TObject);
var
  strKind: string;
begin
  if GetConnectionKind(strKind) then
    ShowMessage(strKind);
 
end;
 
end.

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