Posted by jpluimers on 2018/12/04
For my link archive: [WayBack] Hi there.Is it possible to get RTTI information for IDE “built-in” classes with an OTA Wizard?Let’s say I create a TRttiContext object in my wizard…. – Fl Ko – Google+
Here is an IDE explorer that helps: [WayBack] GitHub – DGH2112/Delphi-IDE-Explorer: A RAD Studio IDE wizard / expert / plugin that allows you to browser the internal fields, methods, properties and events of the IDE.
–jeroen
Posted in Debugging, Delphi, Development, Software Development | Leave a Comment »
Posted by jpluimers on 2018/12/04
Uh-oh: [WayBack] Unicode in Microsoft Windows: UTF-8 – Wikipedia:
Microsoft Windows has a code page designated for UTF-8, code page 65001. Prior to Windows 10 insider build 17035 (November 2017),[7] it was impossible to set the locale code page to 65001, leaving this code page only available for:
- Explicit conversion functions such as MultiByteToWideChar
- The Win32 console command
chcp 65001to translate stdin/out between UTF-8 and UTF-16.This means that “narrow” functions, in particular
fopen, cannot be called with UTF-8 strings, and in fact there is no way to open all possible files usingfopenno matter what the locale is set to and/or what bytes are put in the string, as none of the available locales can produce all possible UTF-16 characters.On all modern non-Windows platforms, the string passed to
fopenis effectively UTF-8. This produces an incompatibility between other platforms and Windows. The normal work-around is to add Windows-specific code to convert UTF-8 to UTF-16 using MultiByteToWideChar and call the “wide” function.[8] Conversion is also needed even for Windows-specific api such asSetWindowTextsince many applications inherently have to use UTF-8 due to its use in file formats, internet protocols, and its ability to interoperate with raw arrays of bytes.There were proposals to add new API to portable libraries such as Boost to do the necessary conversion, by adding new functions for opening and renaming files. These functions would pass filenames through unchanged on Unix, but translate them to UTF-16 on Windows.[9] This would allow code to be “portable”, but required just as many code changes as calling the wide functions.
With insider build 17035 and the April 2018 update (nominal build 17134) for Windows 10, a “Beta: Use Unicode UTF-8 for worldwide language support” checkbox appeared for setting the locale code page to UTF-8.[a] This allows for calling “narrow” functions, including
fopenandSetWindowTextA, with UTF-8 strings. Microsoft claims this option might break some functions (a possible example is _mbsrev[10]) as they were written to assume multibyte encodings used no more than 2 bytes per character, thus until now code pages with more bytes such as GB 18030 (cp54936) and UTF-8 could not be set as the locale.[11]
- Jump up^ [WayBack] “UTF-8 in Windows”. Stack Overflow. Retrieved July 1, 2011.
- Jump up^ [WayBack] “Boost.Nowide”.
- Jump up^ [WayBack] https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/strrev-wcsrev-mbsrev-mbsrev-l
- Jump up^ [WayBack] “Code Page Identifiers (Windows)”. msdn.microsoft.com.
Via [WayBack] Microsoft Windows Beta UTF-8 support for Ansi API could break things. Wiki Article of the Change… – Tommi Prami – Google+
Related, as handling encoding is hard, especially if it is changed or not your default:
[WayBack]
One of out customer had selected that and we started to experience very weird problems and took some time to find out why it misbehaves.
None of the application could connect to Firebird SQL server (Ours or third party) successfully.
So would be smart to go through all tooling and code with that setting, we never know what M$oft will do with that, will it ever be released or will it soon be default for all.
–jeroen
Posted in .NET, C, C++, Delphi, Development, Encoding, GB 18030, Power User, Software Development, UTF-16, UTF-32, UTF-8, UTF16, UTF32, UTF8, Windows, Windows 10 | 2 Comments »
Posted by jpluimers on 2018/11/30
[WayBack] Ouch: “It’s due to some Castalia code, that’s merged in Delphi since XE8. It’s only possible to reduce this issue, so it will happen less often… – Thomas Mueller (dummzeuch) – Google+
“It’s due to some Castalia code, that’s merged in Delphi since XE8. It’s only possible to reduce this issue, so it will happen less often. Use: Tools – Options – Editor Options – Color – Structural Highlighting and switch everything off. Looking at how the code is integrated into the IDE, this results in less editor parsing and repainting. Irrespective of that, the handler that causes the Access violation is still attached to the editor. So basically, we will have to wait for this to be fixed in 10.3.”
The errors in 10.2 are related to “EditorStructuralHighlight.TStructuralHighlighter.EvQuery” – Google Search, but older versions can have a different path.
Lets hope that by a new Delphi version has been released that fixes this, but do not expect older versions to get fixes for it.
For XE8, it is enough to disable Castalia, which is on the list of packages to disable in …/Native/Delphi/Scripts/List-Delphi-Installed-Packages.ps1.
More recent versions have the old Castalia code base much more rightly integrated, so the only way is to disable Structural Syntax Highlighting in the Editor options.
More at:
When I add a file or form to a Delphi project, often I get an access violation. Then I have to restart Delphi, open the project and try it again. Then it sometimes workes, sometimes I get the same Access violation. I am having this issue in all Delphi versions since XE8.
…
Looking at how the code is integrated into the IDE, this results in less editor parsing and repainting. Irrespective of that, the handler that causes the Access violation is still attached to the editor.
I have seen this happen too, but so intermittently that I could not point it back to this code (especially since I usually have Model Maker Code Explorer and GExerts loaded which makes it harder to trace back issues to actual Delphi things).
–jeroen
Posted in Delphi, Development, Software Development | 2 Comments »
Posted by jpluimers on 2018/11/23
If you are not a company good at infrastructure, then do not start hosting new things yourself. This is why I like the DelphiPraxis forums (both English and German), as they really know what they are doing.
Of course, forums never have all the features in a way that each user wants, but DelphiPraxis is secure, has well maintained and public moderators, and a history if quality posts.
But the G+ group did move there for a reason (: [WayBack] We have moved to https://en.delphipraxis.net ! Starting January 1st, 2019 – the G+ Delphi Developers Community will be closed for new posts and new mem… – Lars Fosdal – Google+
After a long series of goofing around with infrastructure (old forums, new forums, now newer forums, years of TLS trouble, selling software or which the infrastructure has been down for a long time), last week, finally they had the [WayBack] New official Embarcadero forums online http://community.idera.com/developer-tools/ The sign-up/login is a bit prickly at first, so keep your login name… – Lars Fosdal – Google+.
The announcement already has a the catch in the title: initially they were http only, so totally insecure for your logon data. They could have easily circumvented that by deploying some LetsEncrypt renewal, for instance the commercial one in Delphi ([WayBack] Execute’s Online Store), of which this is a demo: [WayBack] GitHub – tothpaul/LetsEncryptDelphi: Let’s Encrypt component for Delphi Tokyo 10.2.3
I have not added them to embarcaderomonitoring.wiert.me, as they are now on the Idera.com domain, so I will likely start a special monitoring page for those subdomains.
–jeroen
Posted in Delphi, Development, Power User, Security, Software Development | Leave a Comment »
Posted by jpluimers on 2018/11/22
The first messages on G+ saw about Delphi 10.3 Rio are these:
“I would have preferred to have the plugins ready at the same time Rio shipped, but shipping Rio itself took precedence.” – if you would have done that you would have seen for yourself where it still has some glitches and what is problematic for third party plugin developers before the release, but hey…
[WayBack] Are these menus removed in 10.3 Rio? “The context menus for the code editor tabs and files in the Project Manager now have a “Show In Explorer” menu it… – Zhan Wang – Google+
+Ralf Stocker On the contrary. Inline variables reduce scope, make code more readable and remove a whole range of potential bugs.
You can make fine mess out of your code with or without inline variables. And if you do it will not be their fault but yours.
+Darian Miller So we should never get any new features because existing tutorials will be broken and we will have to learn something new?
If you are confused by reading code with inline variables more than five minutes after you have learned about existence of that feature, maybe you are in the wrong profession.
And no, reducing scope is not code smell. You cannot always refactor into another method. Small methods are good, but they must have some logical organization.
Too much granulation can be equally bad as too less granulation.
+Darian Miller First of all, you don’t have to use inline variables if you don’t like them. Cost of readability, departure from historical context/documentation, lack of backward compatibility will equal to zero. Even the tooling will not be broken if you don’t use it (unless, of course you don’t write tools)
Some benefits, there are too many to write them all:
You cannot forget to initialize variable before use
procedure Test1;
begin
var sl := TStringList.Create;
try
finally
sl.Free;
end;
end;
You cannot use variable that belongs to wrong scope and might be uninitialized – this code will not compile
procedure Test2;
begin
try
var sl := TStringList.Create;
finally
sl.Free;
end;
end;
5. Type inference – repeating type two times, especially with generics makes code harder to read because while you are skipping reading redundant information, you may skip important one.
This is just the tip of the iceberg. Inline variables are without a doubt extremely valuable feature.
Coding will be a lot simpler as Dalija explained. Here an example using generics:
TYourType = TDictionary<String, Cardinal>;
TYourClass = class
fSomeDic : TYourType
public
procedure DoSomething;
end;
implementation
procedure TYourClass.DoSomething;
begin
for var lItem in fSomeDic do
litem.Value := 10;
end;
As you see this is very easy to read. And litem belongs to the for loop. It doesn’t exists outside. Any reference to it will raise an error.
If you need to change your base type to
TYoutype = TDictionary<string, uint64>;
There’s nothing else to change. No need to hunt every tpair<K,V> declaration.
You have the tools, use it at you see fit!
program Test_C2527;
{$APPTYPE CONSOLE}
uses
Generics.Collections;
type
TData = record
Z: Integer;
end;
var
Q: TThreadedQueue;
begin
end.
program Project3;
{$APPTYPE CONSOLE}
uses
Generics.Collections,
Types;
type
TDateAndRawData = record
Values : PDouble; // pointer to the data 'array'
end;
TDataQueue = TThreadedQueue<TDateAndRawData>;
begin
end.
So lets take a look at which suggestions made the cut for 10.3 – referencing my original post.
Feature Implemented Comments … No Type Inference Yes! For inline variables only, Confuses code insight! Inline variable declaration, with type inference and block scope Yes, Yes and Yes! Confuses code insight! Loop variable inline declaration Yes! Confuses code insight! … No
Related:
I think I will wait a while before installing until more positive messages are being published.
If you do want to try, the hashes of delphicbuilder10_3_0_94364.iso are these:
crc32 157b6e36 md5 0882d58cb53a7d0a828cc45d06c6ecd0 sha1 21579b530f781895885923809d9e670b439ebf9d sha256 9213de93c2abdd6a2ee23aa84fc7e63a87d62d0344f0d0f0ee162d0e7dce7c7d
and for the radstudio10_3_0_esd_94364.exe they are:
crc32 033aeb53 md5 b25fab9d5f0724fb1d59ea77deff6702 sha1 289bbf33c90ae43b151af116e1e7c7a5348591e6 sha256 fb9a825ddaf235441ff72c10fbb03d2cf94adb3f037508e69f0978a37dc95773
PS: [WayBack] How to verify file hashes on macOS | ModMy
Posted in Conference Topics, Conferences, Delphi, Development, Event, Software Development | Leave a Comment »
Posted by jpluimers on 2018/11/21
Interesting read: [WayBack] Delphi sorcery: Loop wars – measuring performance.
It is on optimisation of for…in constructs. More comments at [WayBack] Since there was this offtopic argument going on about performance of for-in versus for-to. – Stefan Glienke – Google+, including penalties for TStrings, string handling and inline methods.
–jeroen
Posted in Delphi, Development, Software Development | Leave a Comment »
Posted by jpluimers on 2018/11/20
It’s been a wish for a very very long time: to get the name of an identifier as a string in Delphi:
For now the best one can do is either using an Assert and catching the exception (it gets you the unit name, source file name and source line number) in the links below, or using debug symbol information (like a MAP or TDS file) mentioned in the StackOverflow questions above.
C# has had a [WayBack] nameof for many years now that is evaluated at compile time: [WayBack] c# – Is nameof() evaluated at compile-time? – Stack Overflow.
There is a request RAD Studio – RSP-13290: NameOf(T) compiler (magic) function in Quality Portal by Horácio Filho about 3 years ago quotes below.
Since it took the C# team about 3 years after the original [WayBack] Add nameof operator in C# – Visual Studio request, I wonder how fast the Delphi team is.
NameOf .NET-like compiler magic (intrinsic) function would eliminate a lot of hand-written exception messages from several units.
C# 6 introduced nameof operator to obtain the simple (unqualified) string name of a variable, type, or member.
With the current Delphi implementation, after changing variables name we have ot change the related exception message as well. Putting variables name in the code is not a good practise, and is here that NameOf taking place saving tons of lines of code. As the result of NameOf(T) function (if so) is evaluated at compile time (according to the C# implementation – http://stackoverflow.com/a/26573179) we need a help from compiler or it could be achieved using RTTI.
There is a discussion on Google+ community [WayBack] https://plus.google.com/+StefanGlienke/posts/AsGHSLF4rTX.
The function could be designed as
NameOf(x: Identifier)
following the same (or similar) warranties C# provides.
Using Assert:
–jeroen
Posted in Delphi, Development, Software Development | 2 Comments »
Posted by jpluimers on 2018/11/15
My solution in [WayBack] delphi – post-build event with multiple if/copy combinations only execute if first file does not exist – Stack Overflow is an addendum to my 2014 post Delphi prebuild/prelink/postbuild events.
Here we go:
Posted in Conference Topics, Conferences, Delphi, Development, Event, Software Development, The Old New Thing, Windows Development | Leave a Comment »
Posted by jpluimers on 2018/11/13
Cool: I never knew the Delphi debugger’s expression understood more than just expressions: compiler directives too!
[WayBack] @AndyHTech on Twitter:
The debugger’s expression evaluator can’t access an PInteger like an array because PInteger wasn’t declared with $POINTERMATH ON. But if you write “{$POINTERMATH ON} MyIntPtr[0]” into the evaluator the array access works. POINTERMATH ON should always be on in the expr evaluator.
… and if you did this, the option stays active until the compiler has to compile a project, the it is reset.
–jeroen
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Posted by jpluimers on 2018/11/13
Reminder to self: check this when it re-occurs [WayBack] Delphi 10.1 Berlin Update 1 exit error · GitHub.
there is an Invalid pointer operation. inside System.TObject.FreeInstance with a stack trace involving multiple rounds of
[50BE9CC9]{vcl240.bpl } Vcl.Forms.TCustomForm.CloseQuery (Line 7061, "Vcl.Forms.pas" + 8) + $14 [5393DDD4]{DDevExtensionsD101.dll} DSUFeatures.CloseForm + $28 [5393DEA2]{DDevExtensionsD101.dll} DSUFeatures.HookedTCustomFormClose + $42 [50BE8A80]{vcl240.bpl } Vcl.Forms.TCustomForm.WMClose (Line 6398, "Vcl.Forms.pas" + 0) + $0 [50AA3B32]{vcl240.bpl } Vcl.Controls.TControl.WndProc (Line 7313, "Vcl.Controls.pas" + 91) + $6 [1ACC4D50]{tmsdXE10.bpl} Advgrid. + $0
–jeroen
Posted in Delphi, Delphi 10.1 Berlin (BigBen), Development, Software Development | Leave a Comment »
The Wiert Corner - irregular stream of stuff 