ftpcli.pas

包含常用Internet协议TCP,UDP、HTTP、FTP、Telnet等

    if CanAbort then begin
        try
            Abort;
        except
        end;
    end;
end;


{* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *}
procedure TCustomFtpCli.WMFtpRequestDone(var msg: TMessage);
begin
    if Assigned(FOnRequestDone) then
        FOnRequestDone(Self, FRequestType, Msg.LParam);
end;


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procedure TCustomFtpCli.Notification(AComponent: TComponent; Operation: TOperation);
begin
    inherited Notification(AComponent, Operation);
    if Operation = opRemove then begin
        if AComponent = FControlSocket then
            FControlSocket := nil
        else if AComponent = FDataSocket then
            FDataSocket := nil;
    end;
end;


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procedure TCustomFtpCli.SetErrorMessage;
begin
    if FErrorMessage = '' then
        FErrorMessage := FLastResponse;
end;


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procedure TCustomFtpCli.DestroyLocalStream;

begin
 if Assigned(FLocalStream) and not FStreamFlag then
  begin
   FLocalStream.Destroy;
   FLocalStream := nil;
  end;
end;

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procedure TCustomFtpCli.SetLocalFileName (FileName:String);
begin
 FLocalFileName:=FileName;
 if FileName<>'' then FStreamFlag:=False;
end;


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procedure TCustomFtpCli.SetLocalStream (Stream:TStream);
begin
 FLocalStream:=Stream;
 FStreamFlag:=(Stream<>NIL);
 if FStreamFlag then FLocalFileName:='';
end;


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procedure TCustomFtpCli.TriggerDisplay(Msg : String);
begin
    if Assigned(FOnDisplay) then
        FOnDisplay(Self, Msg);
end;


{* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *}
procedure TCustomFtpCli.TriggerDisplayFile(Msg : String);
begin
    if Assigned(FOnDisplayFile) then
        FOnDisplayFile(Self, Msg);
end;


{* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *}
procedure TCustomFtpCli.TriggerError(Msg : String);
begin
    if Assigned(FOnError) then
        FOnError(Self, Msg);
end;


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procedure TCustomFtpCli.DisplayLastResponse;
begin
     TriggerDisplay('< ' + FLastResponse);
end;


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procedure TCustomFtpCli.StateChange(NewState : TFtpState);
begin
    if FState <> NewState then begin
        FState := NewState;
        TriggerStateChange;
    end;
end;


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function TCustomFtpCli.GetBinary : Boolean;
begin
     Result := (FType = 'I');
end;


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procedure TCustomFtpCli.SetBinary(Value : Boolean);
begin
     if Value then
         FType := 'I'
     else
         FType := 'A';
end;


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function TCustomFtpCli.Progress : Boolean;
var
    Abort : Boolean;
begin
    Abort := FALSE;
    if Assigned(FOnProgress) then
        FOnProgress(Self, FByteCount + FResumeAt, Abort);

    if Abort then begin
        TriggerDisplay('! Abort requested');
        FDataSocket.Close;
    end;

    Result := not Abort;
end;


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procedure TCustomFtpCli.SendCommand(Cmd : String);
begin
    if Assigned(FOnCommand) then
        FOnCommand(Self, Cmd);
    TriggerDisplay('> ' + Cmd);
    if FControlSocket.State = wsConnected then
        FControlSocket.SendStr(Cmd + #13 + #10);
end;


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procedure TCustomFtpCli.HandleError(const Msg : String);
begin
      if Assigned(FOnError) then
           TriggerError(Msg)
      else
           raise FtpException.Create(Msg);
end;


{* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *}
{* Return TRUE if component is ready for next operation.                    }
{* Trigger an error or return FALSE if not ready                            }
function TCustomFtpCli.CheckReady : Boolean;
begin
    Result := (FState in [ftpReady, ftpInternalReady]);
    if not Result then
        HandleError('FTP component not ready');
end;


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procedure TCustomFtpCli.OpenAsync;
begin
    if not CheckReady then
        Exit;
    if FConnected then begin
        HandleError('FTP component already connected');
        Exit;
    end;

    if not FHighLevelFlag then
        FRequestType := ftpOpenAsync;

    FRequestDoneFlag  := FALSE;
    FReceiveLen       := 0;
    FRequestResult    := 0;
    FDnsResult        := '';
    StateChange(ftpDnsLookup);
    case FConnectionType of
      ftpDirect, ftpSocks4, ftpSocks4A, ftpSocks5: FControlSocket.DnsLookup(FHostName);
      ftpProxy: FControlSocket.DnsLookup(FProxyServer);
    end;
end;


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procedure TCustomFtpCli.ExecAsync(
    RqType      : TFtpRequest;
    Cmd         : String;         { Command to execute                      }
    OkResponses : array of Word;  { List of responses like '200 221 342'    }
    DoneAsync   : TFtpNextProc);  { What to do when done                    }
var
    I : Integer;
begin
    if not CheckReady then
        Exit;

    if not FConnected then begin
        HandleError('FTP component not connected');
        Exit;
    end;

    if not FHighLevelFlag then
        FRequestType := RqType;

    for I := 0 to High(OkResponses) do
        FOkResponses[I] := OkResponses[I];
    FOkResponses[High(OkResponses) + 1] := 0;

    FRequestDoneFlag  := FALSE;
    FNext             := NextExecAsync;
    FDoneAsync        := DoneAsync;
    StateChange(ftpWaitingResponse);
    SendCommand(Cmd);
end;


{* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *}
procedure TCustomFtpCli.ExtractMoreResults;
var
    NumericCode : LongInt;
    p           : PChar;
begin
    if FRequestResult = 0 then begin
        if FFctPrv in [ftpFctSize] then begin
            p := GetInteger(@FLastResponse[1], NumericCode);
            GetInteger(p, FSizeResult);
        end;
        if FFctPrv in [ftpFctCDup, ftpFctPwd, ftpFctMkd, ftpFctCwd] then begin
            p := GetInteger(@FLastResponse[1], NumericCode);
            GetQuotedString(p, FDirResult);
        end;
    end;
end;


{* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *}
procedure TCustomFtpCli.NextExecAsync;
var
    I : Integer;
    p : PChar;
begin
    DisplayLastResponse;
    if not (FLastResponse[1] in ['0'..'9']) then
        Exit; { Continuation line, nothing to do }
    p := GetInteger(@FLastResponse[1], FStatusCode);
    if p^ = '-' then
        Exit; { Continuation line, nothing to do }

    if FOkResponses[0] = 0 then begin
        { The list of ok responses is empty }
        if FStatusCode >= 500 then begin
            { Not a good response }
            FRequestResult := FStatusCode;
            SetErrorMessage;
        end
        else
            FRequestResult := 0;
    end
    else begin
        { We have a list of ok response codes }
        for I := 0 to High(FOkResponses) do begin
            if FOkResponses[I] = 0 then begin
                { No good response found }
                FRequestResult := FStatusCode;
                SetErrorMessage;
                break;
            end;
            if FOkResponses[I] = FStatusCode then begin
                { Good response found }
                FRequestResult := 0;
                Break;
            end;
        end;
    end;

    if FPassive and (FStatusCode = 227) then
      FPasvResponse := FLastResponse;

    ExtractMoreResults;

    if Assigned(FDoneAsync) then
        FDoneAsync
    else
        TriggerRequestDone(FRequestResult);
end;


{* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *}
procedure TCustomFtpCli.QuitAsync;
begin
    DestroyLocalStream;
    FFctPrv := ftpFctQuit;
    ExecAsync(ftpQuitAsync, 'QUIT', [221], DoneQuitAsync);
end;


{* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *}
procedure TCustomFtpCli.DoneQuitAsync;
begin
    FControlSocket.Close;
end;


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procedure TCustomFtpCli.CwdAsync;
begin
    if Length(FHostDirName) <= 0 then begin
        HandleError('HostDirName emtpy');
        Exit;
    end;

    FFctPrv := ftpFctCwd;
    ExecAsync(ftpCwdAsync, 'CWD '+ FHostDirName, [200, 250, 257], nil);
end;


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procedure TCustomFtpCli.UserAsync;
begin
    if Length(FUserName) <= 0 then begin