Lars Fosdal

https://community.idera.com/developer-tools/b/blog/posts/gm-update?utm_source=Article&utm_medium=email&utm_content=Article-190924-GMUpdate

See also Jim's blog

https://community.idera.com/developer-tools/b/blog/posts/the-future-of-codecentral

Since I don't have an eidetic memory, I rarely use it, but I won't say that I never use it.

I prefer bookmarks if I need to frequently jump between sections in a file.

That said, based on Remy's post - TService could do with a sibling: TServiceEx that handles the new control codes.

Is there a QP I can vote for?

We do something similar to what Stefan does.

We have a number of services, all implemented around a server core class which in itself is unaware of if it is running as a service or as an application.

We wrap TService using a small "helper" class to set up the appropriate server core descendant and hook the svc events that we care about.

The test application simply instantiates the same core object and hooks in a few handlers that f.x. will show certain config info and log outputs in a list view.

Using that approach, writing and testing service code has pretty much become trivial.

We did run into one snag the other day, when we moved a file share URL from a server drive share to a DFS share.  Turns out that Local System accounts cannot access DFS file shares, so you either have to give the machine access to the DFS through AD, or run the service under an AD user account that can be given access. We chose the latter.

I use a queue,  Each thread writes log data to the queue which basically is a ring buffer. The log thread periodically (every two seconds) flush the data asynchronously from the ring buffer, writing multiple entries at a time.

I really don't like relying on messages for inter-thread communication - with one exception: the background threads notifying the foreground thread that there is data to fetch from the thread out-queues.

https://quality.embarcadero.com/browse/RSP-23056

Debugger watch / evaluate shows wrong values for inline declared local variables with duplicate names within same routine.

Put a breakpoint on each of the lines with breakpoint in the comment.
Run
at A, hover over variable s, or evaluate s shows value A
at C, hover over variable s, or evaluate s shows value A - should have been C
The actual value is C - so it is a debugger bug

program ReusedLocalVariables;

{$APPTYPE CONSOLE}

{$R *.res}

uses
  System.SysUtils;

type
  TTest = class
  public
    procedure Check(const aValue: String);
    procedure Test;
  end;

procedure TTest.Check(const aValue: String);
begin
  Writeln(aValue);
end;

procedure TTest.Test;
begin
  begin
    var s := 'A';
    Check(s);   // Breakpoint: S shows 'A' - Output in check = 'A'
  end;
  begin
    var s := 'C';
    Check(s);   // Breakpoint: S shows 'A' - should have been 'C' - Output in check = 'C'
  end;
end;

begin
  try
    var Test := TTest.Create;
    try
      Test.Test;
      Test.Free;
    except
      on E: Exception do
        Writeln(E.ClassName, ': ', E.Message);
    end;
  finally
    Write('Press Enter: ');
    Readln;
  end;
end.

[dcc32 Warning] W1029 Duplicate constructor 'MyClassName.ConstructorName' with identical parameters will be inacessible from C++
 

{$WARN DUPLICATE_CTOR_DTOR OFF}

does not seem to have any effect in Delphi 10.3.1
 

I know I can add an extra dummy parameter to change the signature - but shouldn't that $WARN thing have worked too?

18 hours ago, Fr0sT.Brutal said:

Thanks to all who answered, sorry for late response.

Docs are good but hardly ever being read from A to Z. Interface should be intuitive IMHO or at least give some hints.

Very interesting regarding work queues. Have you got any shareable code to look at?

 

What about Synchronize/Queue? I always tried to avoid it but see Emba have done pretty much in this area. Is it safe?

Sorry, no code to share as it is embedded in a larger framework.
I do use the queues in Omni Thread Library from @Primož Gabrijelčič down in the core, though.

As for Synchronize: Just say no.

I sometimes miss the output from the old compilers which showed the path and name of  the units being compiled in the sequence they were built, in a complete log.

VCL.Forms, VCL.Printers and VCL.StdCtrls has a few of these, but for only for function parameters in CLR code.

{$IF DEFINED(CLR)}
type
  TMonitorEnumerator = class
    FList: TList;
    FEnumProc: TMonitorEnumProc; // reference to the delegate so the garbage collector doesnt free it
    constructor Create(List: TLIst);
    function EnumMonitorsProc(hm: HMONITOR; dc: HDC;
      [in] var r: TRect; Data: LPARAM): Boolean;
  end;
{$ENDIF}

and on the topic of CLR: https://stackoverflow.com/questions/2210122/why-are-there-so-many-if-definedclr-in-the-vcl-rtl

Yeah... that stuff really should be made to go away. 

What about the https://www.delphihtmlcomponents.com/ from @Alexander Sviridenkov ?

I don't use them, but I've seen them getting a lot of praise.

 

 

 

 

16 hours ago, sjordi said:

Very strange.

I'm using an FMX app, not a VCL.

It has to be one of the units you use that pulls in non-VCL stuff, then?

What version is your comctl32.dll?

Can an ancient version have snuck into your path somewhere?

10.4 has "language improvements".

Some of the stuff I'd want to see here - although I expect only the two top ones to actually be candidates...

- parameterless record constructors

- nullable types

- proper record constants that are treated as constants

- generic support for nullable types

- generic constraint for enumerated types so that you can for a Value:T use Ord(Value), Set of T, Value in Set, etc.

- generic constraint for number, so that you can use mathematical operators on a value of T

- generic record helpers - TArray<T> / record helper for TArray<T>

- helper aggregation/overload/scoping so that one helper does not have to replace another

- lambda expressions

- ternary operator to shorten those lambdas

Infradestructure?

Duplicate of 

Are you certain that JS is enabled and triggered on page load?

Have you tried the embedded Chrome browser to see if that makes any difference?
https://github.com/salvadordf/CEF4Delphi

I think your last sentence already is in effect for a large number of sites as it makes harder to crawl content tags and references if they are generated dynamically by JS.

I prefer regular Json as defined by Ecmascript ES5 / https://json.org
When exchanging data, I prefer rigid formats over flexible formats.

I prefer using thread safe queues  aka the mailslot principle.

Normally I let my worker threads have an workqueue and a reference to the mainthread responsequeue.

I post a task to the workqueue, getting a task ticket, and the background thread posts a response/result  package to the responsequeue, marked with that task ticket.

I can either poll the response queue with the ticket, or I can have the thread fire off a windows message to the main thread that basically says "check the queue for this task ticket"

Benefits: 100% async and isolated.  No concurrent access to data.  All updates can happen at the leisure of the main thread.

Although DuckDuckGo does not offer a full cover API, it seems that their DOM is easier to parse which could give you easier access to the data you need - unless you are specifically looking for Google data?
https://stackoverflow.com/questions/37012469/duckduckgo-api-getting-search-results

It depends a lot on what data you are trying to gather.

On 8/4/2019 at 1:23 PM, Michel Bernabela said:

>    FiApp_PushPunchCommand.Parameters[0].Value.AsDateTime := FPdtFrom;
>    FiApp_PushPunchCommand.Parameters[1].Value.AsDateTime := FPdtDateIn;
>    FiApp_PushPunchCommand.Parameters[10].Value.SetStream(FPmsPic, FInstanceOwner);

Is there a particular reason that the params are numbered 0, 1, 10 ?

On the server side - have you inspected the stream after you fill it from the request?  Does the length of the stream match the size of the image?

The admins are fast 🙂

How many of these are spammers?

Which database?

For SQL Server, there is this: https://stackoverflow.com/questions/3817885/sql-server-find-out-default-value-of-a-column-with-a-query

If you installed 10.3.1 in your VM with the webinstaller, you can simply download the new webinstaller for 10.3.2 and run it.  It will still automatically uninstall the previous version, but if you select to keep the configuration, it will remain configured for 10.3.2.

If you installed 10.3.1 in your VM from the ISO image, I recommend uninstalling it before installing the 10.3.2 from either the new ISO image or the new webinstaller.

Personally, I always use the webinstaller.

/off-topic:

Considering the number of new features in 10.3.2, I am a little miffed that you can't have both 10.3.1 and 10.3.2 installed at the same time.