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  Need to time arrival of TCP socket data, how?
Posted by: BosseB - 11-09-2018, 11:28 AM - Forum: Indy General Discussion - Replies (4)

I am troubleshooting a WiFi UART<=>TCP socket bridge device and I need to verify the arrival times of packets sent via the UART input to the device at the TCP client end.
So in this case I will be sending packets of data via the serial link to the device starting at exactly 1 s intervals.
The packets are rather short, basically date/time strings in pure ASCII like "20181109" and "13:46:17"
My test strings start with STX and end with ETX bytes (0x02 and 0x03 respectively).

Each second the date and time packets are sent back-to-back and then nothing until the next second.
Speed is 38400 baud.

I am using FreePascal 3.0.4 and Lazarus 1.8.0 with the indylaz package installed on a Windows 7 x64 laptop.

Since the data arrive at times the client does not control and indy is blocking I have trouble implementing this checking utility...
What I need is:
- Connect the TIdTCPClient object to the bridge device on port 2101 (this is not a problem)
- Somehow start listening for incoming data
- When a packet has arrived transfer it to the main application for timing and logging purposes.

Probably this needs some kind of thread or a loop with Application.Processmessages, but I am not sure how to approach this...

Any advice available?

I have already implemented a configuration utility for the same WiFi bridge device using Indy, but that only had to deal with handshakes with a command sent from the client and a response being sent back almost instantly.
These commands are not started with STX but ended with ETX.
So this is implemented as follows (excerpt from config utility code), hopefully I could re-use some of that code:

  STX = 2;
  ETX = 3;

constructor TConfigCommHandler.Create;
  FComm := TIdTCPClient.Create(NIL);
  FComm.IPVersion := Id_IPv4;
  FComm.ReadTimeout := 5000;
  FComm.ConnectTimeout := 5000;
  FTcpConnected := false;
  FComm.OnConnected := OnConnected;
  FComm.OnDisconnected := OnDisconnected;

procedure TConfigCommHandler.OnConnected(Sender: TObject);
  FTcpConnected := true;

procedure TConfigCommHandler.OnDisConnected(Sender: TObject);
  FTcpConnected := false;

procedure TConfigCommHandler.SendCommInfo(Msg: AnsiString);

//Show string in listbox on main form
  if Assigned(FOnComm) then
    FOnComm(Self, Msg);

function TConfigCommHandler.Connect(Server: string; Port: word): boolean;
{Connect connects to the server:port}
    Result := false;
    FComm.Connect(Server, Port);
    while not FTcpConnected do
    Result := FTcpConnected;
    on E: Exception do
      FLastError := E.Message;

function TConfigCommHandler.GetItem(Cmd: TIdBytes; var Data: TIdBytes): boolean;
  Resp: AnsiString;
  LPos: Integer;
  Result := false;
  SetLength(Data, 0);
  BytesToStr(Cmd, Resp);
  SendCommInfo('=> ' + Resp);
    FComm.IOHandler.ReadBytes(Data, -1, false);
    Result := Length(Data) > 0;
    if Result then
      if Data[Length(Data)-1] <> ETX then
        FLastError := 'Final ETX missing!';
        Result := false;
        SetLength(Data, Length(Data) -1); //Remove trailing ETX
        BytesToStr(Data, Resp);
        SendCommInfo('<= ' + Resp);
      FLastError := 'No data received within timeout!';
    on E: Exception do
      Result := false;
      FLastError := 'Exception: ' + E.Message;

In the main application the FOnComm procedure is implemented as follows to show incoming data:

procedure TfrmMainConfig.OnComm(Sender: TObject; Msg: AnsiString);
  lbxComm.ItemIndex := lbxComm.Count-1;

As this test is aimed at nailing some randomly occurring timing problems I need to accurately time the arrival of the packets to see if there is any problem in the bridge device. I want to log any time deviation from the 1000 ms mark so see what is going on.
The real consumer of the data sent trough the bridge is an Android App and I suspect that we might be dealing with a problem in that, but I have to prove it. Different developers....

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  How to call a URL from server without showing it to client?
Posted by: mhammady - 11-09-2018, 12:32 AM - Forum: IntraWeb General Discussion - Replies (5)


I'm trying to call a URL that have a security information from server (IW ISAPI) to another server directly without executing a JS or open a new window at the client.

I Tried IdHTTP, and winnet without success. Both gives unkown error when executed from IW form. Is there is a way to make this call directly from the user session, wait for the results, and then move on accordingly?

I'm using IW 14.2.7 with D XE5

Thx in advance...

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  upgrade IW 14 to 15, and beyond
Posted by: chiswilson - 11-09-2018, 12:11 AM - Forum: IntraWeb General Discussion - Replies (1)

Hi all,
I am looking to update my old IW14 (from late 2015) to the latest IW 15 Ultimate so I can do SSL, among other things.
Should I assume its fairly easy to move an IW14 project into IW15?
Any gotcha's I should know about?

Im still on Delphi 2010.
I know I'll have to update my TMS component pack but thats only like 40 euro apparently.

Also, AtoZed... Im just wondering... has it been decided, is the upcoming IW17 going to support Delphi 2010?


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  (Indy) Web application get page error
Posted by: xinyiman - 11-07-2018, 10:42 AM - Forum: Indy General Discussion - Replies (3)

Hi, I use indy for my project combined with lazarus where I need a web server. Everything seems to work, but when I try to read the contents of a web page with a token in json, I get (not always errors). In particular. This:

HTTP / 1.1 200 OK Connection: close Content-Length: 397

This is the link to the lazarus forum where I have already posted the problem and where you can find an example to replicate the error. You will see that I tried to read it synapse, but only out of curiosity, to see if the error was replicable. I'm interested in solving the problem related to indy so I remove synapse dependencies from my project.


Thank you

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  http.sys: Error decoding URL style (%XX) encoded string at position 43
Posted by: ioan - 11-05-2018, 10:27 PM - Forum: IntraWeb General Discussion - Replies (2)

I think I found a problem with decoding query strings in applications built with http.sys.

If I try to open this in an application made with indy, everything works fine:

If I try to open it with application built with http.sys, I get the error:
Error decoding URL style (%XX) encoded string at position 43

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Posted by: UdoBausch - 11-05-2018, 04:00 PM - Forum: IntraWeb General Discussion - Replies (1)

Hello Alexandre,
during installation ov V15.0.15 I get compilation-error in IWCOMPGrids.new.pas
we also have IWCompGrids.pas - with a newer date

Which one is valid ? Huh

It's not a problem do delete the *.new-File out of my project
- but I dont know, if it's the right one

Please give me feedback - Thankyou

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  [SOLVED] GStack.LocalAddress returns empty
Posted by: capslock - 11-05-2018, 12:38 AM - Forum: Indy General Discussion - Replies (4)

I'm using Indy 10 + fpc + lazarus to build a cross platform app.

GStack.LocalAddress returns the IP address at Windows, but returns empty at Linux, and GStack.LocalAddresses.Count = 0. The machine has an ip address, checked by ifconfig.

Anybody help me?



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  IntraWb 15.0.15 is out
Posted by: Alexandre Machado - 11-04-2018, 09:28 PM - Forum: IntraWeb General Discussion - No Replies

Hi guys,

there is a new maintenance release available, version 15.0.15:


Enjoy! :-)

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  AV on FinalizeDataOperations - Delphi5
Posted by: GrahamRola - 10-31-2018, 01:44 PM - Forum: Indy General Discussion - Replies (1)

Delphi 5
Indy 10 5473

I call List in ftp component and it returns the appropriate data.
when the FinalizeDataOperation; is called I get an AV read of address 0xea5278ed.
I Put a breakpoint at the begin of GetResponse and looked at
the call stack (shown below);

What could possible be causing the AEncoding to be anything other
than Nil?  

Couple of other things of note.
When I place mouse over AAAllowedResponses   it only shows  (226) not ([226, 225, 250]);
There are 9 calls to GetResponse before this final call that all show Nil in AEncoding

procedure TIdFTP.FinalizeDataOperation;
  end else begin
    //ftp.marist.edu returns 250
    GetResponse([226, 225, 250]);  // call that generates AV

function TIdTCPConnection.GetResponse(const AAllowedResponses: array of Int16;
 AEncoding: IIdTextEncoding = nil): Int16;
begin  // break point inserted here
  Result := CheckResponse(LastCmdResult.NumericCode, AAllowedResponses);

Call Stack
TIdTCPConnection.GetResponse((...),Pointer($55E4E3) as IIdTextEncoding)

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Sad mcptUnknown is undeclared
Posted by: jeekanhaiya6 - 10-30-2018, 11:00 AM - Forum: Delphi General Discussion - Replies (1)


I am migrating my project from delphi 2009 to delphi berlin and using Indy10 in this. 

In class IdMessageCode, it is saying undeclared Identifier mcptUnknown.

Can you explain why is it happening?


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