david_navigator

5 minutes ago, Attila Kovacs said:

Yeah that's me, and I have a touch screen which I think the problem is.

I tried my phone, Chrome on a S23 Ultra, it loads, but the GUI is unusable on that small display.

Yes. The app is designed to be used on a desktop size device. 

Assuming that your IP address ends in .143 - I can see that you successfully authenticate too.

4 minutes ago, Attila Kovacs said:

I've tried both, chrome and IE, the same, (they are actually the same nowadays anyway)

Very odd.  Let's see if their support comes up with something next week.

5 minutes ago, Attila Kovacs said:

Cannot set properties of null (setting 'redirectionStarted')
TypeError: Cannot set properties of null (setting 'redirectionStarted')
    at Mobile.initTouchManager (https://trial.hiretracknx.com:6580/common/js/thinvnc.m.js:2361:55)
    at initTouchDevice (https://trial.hiretracknx.com:6580/common/js/thinvnc.m.js:2319:18)
    at WebFMX.completeConnection (https://trial.hiretracknx.com:6580/js/webfmx.sdk.js:1397:13)
    at WebFMX.connect (https://trial.hiretracknx.com:6580/js/webfmx.sdk.js:1305:22)
    at https://trial.hiretracknx.com:6580/js/thinfinity.virtualui.js:491:26
    at initializePrintClientNode (https://trial.hiretracknx.com:6580/js/thinfinity.virtualui.js:534:29)
    at start (https://trial.hiretracknx.com:6580/js/thinfinity.virtualui.js:487:13)
    at VirtualUI.connect (https://trial.hiretracknx.com:6580/js/thinfinity.virtualui.js:175:17)
    at https://trial.hiretracknx.com:6580/js/app.js:270:15
    at fireStateEvent (https://trial.hiretracknx.com:6580/virtualui.sdk.min.js:355:406)

I'll raise a ticket to Thinfinity and see if they have any suggestions.

2 minutes ago, Attila Kovacs said:

<o>

 

yes, then I log in and I'm getting an empty site

Odd. Never seen that before (and I have 100's of users). What browser are you using ? Are you on a touch screen device ?

Here's a video clip of what you should see https://Navigator.tinytake.com/msc/OTUyNDkyMF8yMzEzMTE5NQ

9 minutes ago, Attila Kovacs said:

just an empty page, do I need something on the client side?

Odd. You should see something like this. Nothing required client side.

I have a massive app that we converted to use Thinfinty. You can play with it here if you'd like to see the experience from a user POV
https://trial.hiretracknx.com:6580/

Alias: ashoka

Username: HireTrack_Admin
Password: 1234  

There are two areas where we still have issues - some DevEx components don't render properly in certain circumstances - e.g on the first form you see, one of the buttons doesn't get drawn fully until you move your mouse over it. I do have a fix for this issue, but there are other DevEx issues apparently, though we haven't hit any yet.
The other issue I've come across is launching a form that uses an embedded browser. That doesn't work correctly, though Thinfinity people are very reactive and have promised me a fix in the next week of so.

There are areas where we have If Thinfinity.active then in our code - especially anything that involves uploading or downloading files.
 

My biggest gripe with Thinfinity is the license management. We have our app running across about 10 servers, with one licensing server, but there's no way to see which server is using how many licenses - e.g. I can see that 50 licenses are in use, but not which machines are using them. This might not matter for your scenario, but it's an annoyance in ours.

David

16 minutes ago, Cristian Peța said:

 

The OS will free the memory when you unload the dll.

Thanks, but I meant "only make sure to not use a shared memory memory manager with the exe."

On 3/22/2024 at 8:13 PM, Kas Ob. said:

Yes, this is the only way, also you can make it a DLL, only make sure to not use a shared memory memory manager with the exe.

 

Use the OS heap API as local memory manager.

@Kas Ob. could you explain in a little more detail about the memory manager please ? 
 

4 hours ago, Lajos Juhász said:

How you are going to know if t is freed or not?

I was hoping there was something that the OS could deal with. 
If I made the scripting engine a stand alone EXE then whatever the user wrote, Windows would clean up when the exe closed. I was hoping that there might be some way to achieve that within my app.

Doing some research I see that Job Objects details "The virtual memory of job objects isolates the memory behavior of a group of processes (tasks) from the rest of the system", but so far little about how this is achieved.

One of my apps uses PascalScript to allow the user to customise various tasks. However as I've recently discovered it's really easy for the end user to write a script that leaks loads of memory. 

As far as I can see PascalScript doesn't do any kind of memory tidy up when the script ends - it expects the script's author to do that.

Is there some way to encapsulate the instantiated TPSScript object in such a way that I can free any memory when the script object is freed ?

Something like (in psuedo code)

Create memory container;
PSScript:=TPSScript.Create(nil);
PSScript.Script.Assign(fScript);
PSScript.Compile;
PSScript.Execute;
PSScript.Free;
Destroy memory container;

Though I can't actually change any of this as it's not my server. I just had to go with what I could to get my delphi app to talk to it.

Here you go

>Are you sure you are supposed to be using implicit TLS on port 143, and not explicit TLS instead?

If I change the test code above to use explicit then

TheImap.Connect;

never returns. Have I missed setting something else or if this just a strange server ?

> need to use implicit tls on port 143 (why?), then you need to set the Port after setting the UseTLS.

Thanks.

No idea why. I didn't configure the server :)

[Some time later]

I've now discovered that the IdSSLIOHandlerSocketOpenSSL1 code changes the TIMAP4.port property to 993, even though my server wants 143, so setting

TheImap.Port := 143;

after setting the IdSSLIOHandlerSocketOpenSSL1 properties, addresses the issue. 

Not sure if this is an Indy bug or a misunderstanding of how it should work by me.

Replying to my own question simply because this will no doubt bite me on the bum in 5 years time when I refactor the code !!!

I have the following fairly simple code to connect to my IMAP server, however I'm doing something wrong, but I can't work out what.

The first time I click the button, I always get 

ExceptionMessage="Socket Error # 10061
Connection refused."
ExceptionName="EIdSocketError"

However if I then click on the button again, the IMAP control connects to my server just fine and I can retrieve anything I like without a problem.

I've tried setting various properties in various different orders, but that makes no difference, so why does it not work the first time ?

If I make TheImap &  IdSSLIOHandlerSocketOpenSSL1 local to the button1click procedure, rather than class level, then TheIMAP never connects, so that seems to rule out something external blocking the connection first time round and points to something not being initialized correctly, but what am I missing ?

 

type
  TForm3 = class(TForm)
    Button1: TButton;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
    TheImap: TIdIMAP4;
    IdSSLIOHandlerSocketOpenSSL1: TIdSSLIOHandlerSocketOpenSSL;
  public
    { Public declarations }
  end;

var
  Form3: TForm3;

implementation

{$R *.dfm}

procedure TForm3.FormCreate(Sender: TObject);
begin
  TheImap := TIdIMAP4.Create(nil);
  IdSSLIOHandlerSocketOpenSSL1 := TIdSSLIOHandlerSocketOpenSSL.Create(TheImap);
end;

procedure TForm3.Button1Click(Sender: TObject);

begin
  if TheImap.connected then TheImap.Disconnect;

  TheImap.Host := 'xxxxxxxxx';
  TheImap.Username := 'xxxxxxx';
  TheImap.Password := 'xxxxxxx';
  TheImap.Port := 143;

  with IdSSLIOHandlerSocketOpenSSL1 do
  begin
    Destination := format('%s:%d', [TheImap.Host, TheImap.Port]); // e.g 'imap.gmail.com:993';
    Host := TheImap.Host;
    MaxLineAction := maException;
    Port := TheImap.Port;
    DefaultPort := 0;
    SSLOptions.SSLVersions := [sslvTLSv1, sslvTLSv1_1, sslvTLSv1_2];
    SSLOptions.Mode := sslmUnassigned;
    SSLOptions.VerifyMode := [];
    SSLOptions.VerifyDepth := 0;
  end;
  TheImap.IOHandler := IdSSLIOHandlerSocketOpenSSL1;

  TheImap.UseTLS := utUseImplicitTLS;

  try
    TheImap.Connect;
  except
    on E: exception do
      showmessage(E.Message);
  end;
  if TheImap.Connected then
    showmessage('Connected ok');
end;

Surprisingly I can't find an answer to my question here or via google (I'm probably asking the wrong question), but what's the best way to obfuscate API secrets in Delphi ?

e.g. My app needs to send email using Office 365, which requires an oAuth2 login. To start the login process I have a client_ID & a client_secret given to me by Microsoft to identify my app. 
Obviously these need to be stored within the exe but how to hide them such that some (casual) hacker, can't pull them out and pretend to be me ?

Cheers

David

Thanks. This is the first time it's fallen over in 20 years so not too concerned. I just wondered if there was a call like "is there enough stack space left for me to call this routine again" kind of thing.

I have some inherited code that does some complex maths using a recursive function (i.e the function calls itself). Last night a customer had a situation where running the routine killed the app. My belief is that the app ran out of stack space due to this routine calling itself multiple times and thus died.

Is there anyway to detect this is likely to happen so that the code can be aborted with a message instead?

David 

Using Delphi to upload or download from a cloud S3 server, my customers are getting this intermittent error.

exception class    : ENetHTTPClientException
exception message  : Error sending data: (12030) The connection with the server was terminated abnormally.

thread $2f68:
01d4096a +126 HireTrackNX.exe System.Net.HttpClient.Win                           TWinHTTPClient.HandleExecuteError
01d40c76 +2d2 HireTrackNX.exe System.Net.HttpClient.Win                           TWinHTTPClient.DoExecuteRequest
01d4bda2 +1ea HireTrackNX.exe System.Net.HttpClient                               THTTPClient.ExecuteHTTPInternal
01d4c080 +008 HireTrackNX.exe System.Net.HttpClient                               THTTPClient.ExecuteHTTP
01d4b0f2 +0ee HireTrackNX.exe System.Net.HttpClient                               THTTPClient.Execute
01d4bb05 +04d HireTrackNX.exe System.Net.HttpClient                               THTTPClient.DoExecute
01d4fe18 +050 HireTrackNX.exe System.Net.HttpClient                               THTTPClient.Put
022b7f32 +03a HireTrackNX.exe Data.Cloud.CloudAPI                                 TCloudHTTP.Put
022b77e7 +077 HireTrackNX.exe Data.Cloud.CloudAPI                                 TCloudService.IssuePutRequest

Google seems to suggest it could be a Winsock timeout or a TLS mismatch between the target machine and console machine., but I have no understanding of what that actually means in practical terms - it certainly doesn't seem to be related to the size of the file being transferred.
Would that be something as simple as a network connection issue between the client & server ? The server's hosting company tell me there's no issue at their end and the user is connecting to the client over RDP, so there can't be an internet issue at their end either.

I'm really looking for any ideas or suggestions on how to either deal with the error better from a user's POV or how to diagnose what the actual cause is and address that.

Usually if the user retries the upload or download process a couple of times, it does eventually work.

Many thanks

David

Quote

 

None of this should be necessary.

Just using a regular TJsonString outputs 

 

Many thanks.

Don't I feel stupid !!

Now to do some experimenting to see if all the characters in the above routine get escaped correctly automatically .

I have some code that I inherited from someone else which is used to convert a dataset to JSON.

Mostly it works OK, but rather than a £ being converted to \u00A3 it gets converted to \\u00A3 i.e the slash gets escaped again.

So from

"Additional Fuel Used 170 Litres @ £2.00 per Litre"

rather than 
 "Additional Fuel Used 170 Litres @ \u00A32.00 per Litre"

I get 

"Additional Fuel Used 170 Litres @ \\u00A32.00 per Litre"

I've found very similar code in StackOverflow, but that has the same issue. This is the SO code as it's potentially easier to read. 

Can anyone point out where I/they are going wrong please ?

As far as I can tell the EscapeValue code is correctly converting the £ to \u00A3, but then the TJSONPair.create seems to be then re-escaping the one '\' in to '\\'

unit Unit71;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, dbxjson, json;

type
  TForm71 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

  type
  TSvJsonString = class(TJSONString)
  private
    function EscapeValue(const AValue: string): string;
  public
    constructor Create(const AValue: string); overload;
  end;

var
  Form71: TForm71;

implementation

{$R *.dfm}

constructor TSvJsonString.Create(const AValue: string);
begin
  inherited Create(EscapeValue(AValue));
end;

function TSvJsonString.EscapeValue(const AValue: string): string;

  procedure AddChars(const AChars: string; var Dest: string; var AIndex: Integer); inline;
  begin
    System.Insert(AChars, Dest, AIndex);
    System.Delete(Dest, AIndex + 2, 1);
    Inc(AIndex, 2);
  end;

  procedure AddUnicodeChars(const AChars: string; var Dest: string; var AIndex: Integer); inline;
  begin
    System.Insert(AChars, Dest, AIndex);
    System.Delete(Dest, AIndex + 6, 1);
    Inc(AIndex, 6);
  end;

var
  i, ix: Integer;
  AChar: Char;
begin
  Result := AValue;
  ix := 1;
  for i := 1 to System.Length(AValue) do
  begin
    AChar :=  AValue[i];
    case AChar of
      '/', '\', '"':
      begin
        System.Insert('\', Result, ix);
        Inc(ix, 2);
      end;
      #8:  //backspace \b
      begin
        AddChars('\b', Result, ix);
      end;
      #9:
      begin
        AddChars('\t', Result, ix);
      end;
      #10:
      begin
        AddChars('\n', Result, ix);
      end;
      #12:
      begin
        AddChars('\f', Result, ix);
      end;
      #13:
      begin
        AddChars('\r', Result, ix);
      end;
      #0 .. #7, #11, #14 .. #31:
      begin
        AddUnicodeChars('\u' + IntToHex(Word(AChar), 4), Result, ix);
      end
      else
      begin
        if Word(AChar) > 127 then
        begin
          AddUnicodeChars('\u' + IntToHex(Word(AChar), 4), Result, ix);
        end
        else
        begin
          Inc(ix);
        end;
      end;
    end;
  end;
end;


procedure TForm71.Button1Click(Sender: TObject);
var
  LText, LEscapedText: string;
  LJsonString: TSvJsonString;
  LJsonPair: TJsonPair;
  LJsonObject: TJsonObject;
begin
  LText := 'The price is £20.00';
  LJsonString := TSvJsonString.Create(LText);
  LJsonPair := TJsonPair.Create('MyString', LJsonString);
  LJsonObject := TJsonObject.Create(LJsonPair);
  try
    LEscapedText := LJsonObject.ToString;
    showmessage(LEscapedText);
    LEscapedText := LJsonObject.ToJSON;
    showmessage(LEscapedText);
  finally
    LJsonObject.Free;
  end;
end;

end.

1 hour ago, David Schwartz said:

I've been playig around wiht ChatGPT and am really surprised at how quickly it can generate useful code for specific needs.

Me too and there's definitely a learning curve in working out what ChatGPT is good at and what it's not.

Tonight I got it to do, like you, the boring part of writing some class code (I was going to say creating, but I think I'm creating, it's just writing), but I also asked it to write a simple function to remove tags from some HTML to just leave plain text. Even after 8 iterations the code wouldn't still wouldn't compile and even after I'd fixed those issues, the code didn't do what was requested. I'm guessing too many StackOverflow wrong answers have been analysed as code sampled !

 

Something I found it really useful is explaining code that I don't understand.

For example last week someone sent me a function in Python (a new language for me) which even with the comments I couldn't work out what it was doing.

I asked ChatGPT to explain the code, and it did, in a way that then meant I could code something in delphi very quickly.

For example, with your code.

 

Quote

This code defines a Delphi unit called "Person", which contains the definition of a class called "TPerson". This class represents a person and has three properties: FirstName, LastName, and Age. The properties are implemented with getter and setter methods that read and write private fields.

The class also has two methods that are used to convert the person object to and from JSON format. The ToJSON method takes the person object and returns a JSON string that represents the object's properties. The FromJSON method takes a JSON string and creates a new person object with properties that match the values in the JSON string.

The implementation of the ToJSON method creates a new TJSONObject and adds the person's properties to it as name-value pairs. The method then returns the JSON string representation of the TJSONObject.

The implementation of the FromJSON method first parses the JSON string into a TJSONObject, and then creates a new TPerson object. The method then sets the properties of the new TPerson object to the values of the corresponding name-value pairs in the TJSONObject.

The "uses" clause at the top of the unit indicates that the System.SysUtils and System.JSON units are required for this code to compile.