PureBoard

Code: Alles auswählen

Repeat
  If InternetGetConnectedState_(0, 0) 
    result$ = "Online"
  Else
    result$ = "Offline"
  EndIf
  Debug result$
  Delay(1000)
Until q = 1

Code: Alles auswählen

InetIsOffline_(0)

Code: Alles auswählen

interface 

uses 
  Windows, SysUtils, Registry, WinSock, WinInet; 

type 
  TConnectionType = (ctNone, ctProxy, ctDialup); 

function ConnectedToInternet: TConnectionType; 
function RasConnectionCount: Integer; 


implementation 

//For RasConnectionCount ======================= 
const 
  cERROR_BUFFER_TOO_SMALL = 603; 
  cRAS_MaxEntryName       = 256; 
  cRAS_MaxDeviceName      = 128; 
  cRAS_MaxDeviceType      = 16; 
type 
  ERasError = class(Exception); 

  HRASConn = DWORD; 
  PRASConn = ^TRASConn; 
  TRASConn = record 
    dwSize: DWORD; 
    rasConn: HRASConn; 
    szEntryName: array[0..cRAS_MaxEntryName] of Char; 
    szDeviceType: array[0..cRAS_MaxDeviceType] of Char; 
    szDeviceName: array [0..cRAS_MaxDeviceName] of Char; 
  end; 

  TRasEnumConnections = 
    function(RASConn: PrasConn; { buffer to receive Connections data } 
    var BufSize: DWORD;    { size in bytes of buffer } 
    var Connections: DWORD { number of Connections written to buffer } 
    ): Longint;  
  stdcall; 
  //End RasConnectionCount ======================= 


function ConnectedToInternet: TConnectionType; 
var 
  Reg:       TRegistry; 
  bUseProxy: Boolean; 
  UseProxy:  LongWord; 
begin 
  Result := ctNone; 
  Reg    := TRegistry.Create; 
  with REG do 
    try 
      try 
        RootKey := HKEY_CURRENT_USER; 
        if OpenKey('\Software\Microsoft\Windows\CurrentVersion\Internet settings', False) then  
        begin 
          //I just try to read it, and trap an exception 
          if GetDataType('ProxyEnable') = rdBinary then 
            ReadBinaryData('ProxyEnable', UseProxy, SizeOf(Longword)) 
          else  
          begin 
            bUseProxy := ReadBool('ProxyEnable'); 
            if bUseProxy then 
              UseProxy := 1 
            else 
              UseProxy := 0; 
          end; 
          if (UseProxy <> 0) and (ReadString('ProxyServer') <> '') then 
            Result := ctProxy; 
        end; 
      except 
        //Obviously not connected through a proxy 
      end; 
    finally 
      Free; 
    end; 

  //We can check RasConnectionCount even if dialup networking is not installed 
  //simply because it will return 0 if the DLL is not found. 
  if Result = ctNone then  
  begin 
    if RasConnectionCount > 0 then Result := ctDialup; 
  end; 
end; 

function RasConnectionCount: Integer; 
var 
  RasDLL:    HInst; 
  Conns:     array[1..4] of TRasConn; 
  RasEnums:  TRasEnumConnections; 
  BufSize:   DWORD; 
  NumConns:  DWORD; 
  RasResult: Longint; 
begin 
  Result := 0; 

  //Load the RAS DLL 
  RasDLL := LoadLibrary('rasapi32.dll'); 
  if RasDLL = 0 then Exit; 

  try 
    RasEnums := GetProcAddress(RasDLL, 'RasEnumConnectionsA'); 
    if @RasEnums = nil then 
      raise ERasError.Create('RasEnumConnectionsA not found in rasapi32.dll'); 

    Conns[1].dwSize := SizeOf(Conns[1]); 
    BufSize         := SizeOf(Conns); 

    RasResult := RasEnums(@Conns, BufSize, NumConns); 

    if (RasResult = 0) or (Result = cERROR_BUFFER_TOO_SMALL) then Result := NumConns; 
  finally 
    FreeLibrary(RasDLL); 
  end; 
end;