[WayBack] Dear diary, today I learned that it is better to use ifndef rather than ifdef if I want the IDE to keep working properly. I had a uses clause with an i… – Stefan Glienke – Google+
I promised to remind myself, so here it is (:
–jeroen
Archive for the ‘Conference Topics’ Category
Delphi: it is better to use ifndef rather than ifdef to keep the IDE working properly…
Posted by jpluimers on 2017/12/28
Posted in Conference Topics, Conferences, Delphi, Development, Event, Software Development | Leave a Comment »
Valid reasons for having Delphi AnsiString on Mobile platform…not only for Internet but for Shaders also. //…
Posted by jpluimers on 2017/12/27
It’s too bad that you need workarounds to get ByteStrings working on mobile devices as there are APIs there (like shaders) that work best with them.
There was a nice discussion on this last year at [WayBack] I miss AnsiString on Mobile…not only for Internet but for Shaders also.// FMX.Context.GLES.pasconstGLESHeaderHigh: array [0..24] of byte =(Byte(‘p), … – Paul TOTH – Google+ based in this code example in the FMX library undocumented unit FMX.Context.GLES:
// FMX.Context.GLES.pas
const
GLESHeaderHigh: array [0..24] of byte =
(Byte('p'), Byte('r'), Byte('e'), Byte('c'), Byte('i'), Byte('s'), Byte('i'), Byte('o'), Byte('n'), Byte(' '),
Byte('h'), Byte('i'), Byte('g'), Byte('h'), Byte('p'), Byte(' '), Byte(' '), Byte(' '), Byte('f'), Byte('l'),
Byte('o'), Byte('a'), Byte('t'), Byte(';'), Byte(#13));
There are more than 500 places in the Delphi library sources that uses this construct and even more that do other fiddling (like [WayBack] TEncoding.GetBytes) to get from strings to bytes.
I wonder if by now we still need the workarounds that Andreas Hausladen provides:
- [Archive.is] Byte-Strings for Delphi 10 Seattle’s mobile compilers | Andy’s Blog and Tools
- [Archive.is] System.ByteStrings for 10.1 Berlin | Andy’s Blog and Tools
–jeroen
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Posted in Conference Topics, Conferences, Delphi, Development, Encoding, Event, Software Development | 6 Comments »
Another case against FreeAndNil
Posted by jpluimers on 2017/12/21
I started this post as “A case against FreeAndNil” but soon found out about [WayBack/Archive.is] A case against FreeAndNil – Community Blogs – Embarcadero Community.
Recently I was refactoring a bunch of code that was classed based to become interface based.
The old code had a lot of references to classes like this:
FMyField: TMyClass;
The compiler had detected those as compiler errors so now they were like this:
FMyField: IMyInterface;
But the compiler would still happily compile code (for instance in destructors) containing:
FreeAndNil(FMyField);
The only way that FreeAndNil can be implemented is with an untyped var parameter:
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Posted in Conference Topics, Conferences, Delphi, Development, Event, Software Development | 14 Comments »
Until someone writes proper string visualisers for the Delphi debugger…
Posted by jpluimers on 2017/10/31
A few tricks to write long strings to files when the Delphi debugger cuts them off (just because they like using 4k buffers internally);
TStringStream.Create(lRequestMessage).SaveToFile('c:\temp\temp.txt')TIniFile.Create('c:\a.txt').WriteString('a','a',BigStringVar)TFileStream.Create('c:\a.txt', fmCreate or fmShareDenyNone).WriteBuffer(Pointer(TEncoding.UTF8.GetBytes(BigStringVar))^,Length(TEncoding.UTF8.GetBytes(BigStringVar)))
They all work form the debug inspector, but they do leak memory. See comments below.
Via:
- [WayBack] I remember seeing a trick to write a string from the Debug Evaluate/Modify window to a file, but forgot where. – Jeroen Wiert Pluimers – Google+
- [WayBack] If my alzheimer doesn’t cheating on me there was a discussion about how to save things from evaluator. (Ctrl+F7). – Attila Kovacs – Google+
–jeroen
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Posted in About, Conference Topics, Conferences, Delphi, Development, Encoding, Event, Software Development | 6 Comments »
Looking for more examples of Unicode/Ansi oddities in Delphi 2009+
Posted by jpluimers on 2017/09/25
At the end of April 2014, Roman Yankovsky started a nice [Wayback] discussion on Google+ trying to get upvotes for [Wayback] QualityCentral Report #: 124402: Compiler bug when comparing chars.
His report basically comes down to that when using Ansi character literals like #255, the compiler treats them as single-byte encoded characters in the current code page of your Windows context, translates them to Unicode, then processes them.
The QC report has been dismissed as “Test Case Error” (within 15 minutes of stating “need more info”) by one of the compiler engineers, directing to the [Wayback] UsingCharacterLiterals section of Delphi in a Unicode World Part III: Unicodifying Your Code where – heaven forbid – they suggest to replace #128 with the Euro-Sign literal.
I disagree, as the issue happens without any hint or warning whatsoever, and causes code that compiles fine in Delphi <= 2007 to fail in subtle ways on Delphi >= 2009.
The compiler should issue a hint or warning when you potentially can screw up. It doesn’t. Not here.
Quite a few knowledgeable Delphi people got involved in the discussion:
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Posted in Ansi, ASCII, Conference Topics, Conferences, CP437/OEM 437/PC-8, Delphi, Delphi 2006, Delphi 2007, Delphi 2009, Delphi 2010, Delphi 7, Delphi XE, Delphi XE2, Delphi XE3, Delphi XE4, Delphi XE5, Delphi XE6, Development, Encoding, Event, ISO-8859, Missed Schedule, QC, SocialMedia, Software Development, Unicode, UTF-8, Windows-1252, WordPress | Leave a Comment »
Need to write a proper bookmarklet for the wayback archive (:
Posted by jpluimers on 2017/09/14
Some inspiration for writing a proper bookmarklet that finds or saves a WayBack machine page:
- Bookmarklets – What’s New [cannot WayBack nor Google Cache]
- Way Back Machine/Internet Web Archive Bookmarklet Thing [WayBack]
- Archiving Bookmarklets [WayBack]
- Just one click away from Wayback Machine’s archives of current page (Request JavaScript codes for bookmarklet) | Firefox Support Forum | Mozilla Support [WayBack]
- javascript – Posting to Wayback Machine Via Bookmarklet – Stack Overflow [WayBack]
- How to save a web page to the Internet Archive [WayBack]
- How to get the Wayback machine to instantly archive updates to your web page | Why We Protest | Anonymous Activism Forum [WayBack]
On the last link, I was hoping that the https://web.archive.org/liveweb/https://www.example.org would work but it doesn’t work for many URLs and I’m not sure yet why that is.
It has a nice tip that works though:
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Posted in Bookmarklet, Conference Topics, Conferences, Development, Event, JavaScript/ECMAScript, Power User, Scripting, Software Development, Web Browsers | Leave a Comment »
Delphi code of the day…
Posted by jpluimers on 2017/09/11
I was debugging an issue where a Delphi SOAP implementation was shoe-horned into an Indy server and came across the [WayBack] TWebRequest.UpdateMethodType Method.
The further you get down the if/then/else tree, the more often the indexed property Method is accessed, same for the conversion/comparison code.
property Method: string index 0 read GetStringVariable;
So if the HTTP method is POST (very common), then the calls are being made 3 times:
procedure TWebRequest.UpdateMethodType;
begin
{$IFDEF NEXTGEN}
if Method = 'GET' then { do not localize }
FMethodType := mtGet
else if Method = 'PUT' then { do not localize }
FMethodType := mtPut
else if Method = 'POST' then { do not localize }
FMethodType := mtPost
else if Method = 'HEAD' then { do not localize }
FMethodType := mtHead
else if Method = 'DELETE' then { do not localize }
FMethodType := mtDelete
else if Method = 'PATCH' then { do not localize }
FMethodType := mtPatch;
{$ELSE !NEXTGEN}
if System.AnsiStrings.AnsiStrComp(PAnsiChar(Method), 'GET') = 0 then { do not localize }
FMethodType := mtGet
else if System.AnsiStrings.AnsiStrComp(PAnsiChar(Method), 'PUT') = 0 then { do not localize }
FMethodType := mtPut
else if System.AnsiStrings.AnsiStrComp(PAnsiChar(Method), 'POST') = 0 then { do not localize }
FMethodType := mtPost
else if System.AnsiStrings.AnsiStrComp(PAnsiChar(Method), 'HEAD') = 0 then { do not localize }
FMethodType := mtHead
else if System.AnsiStrings.AnsiStrComp(PAnsiChar(Method), 'DELETE') = 0 then { do not localize }
FMethodType := mtDelete
else if System.AnsiStrings.AnsiStrComp(PAnsiChar(Method), 'PATCH') = 0 then { do not localize }
FMethodType := mtPatch;
{$ENDIF NEXTGEN}
end;
–jeroen
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Posted in Conference Topics, Conferences, Delphi, Development, Event, Software Development | 4 Comments »
Delphi analog to C# ?? null-coalescing operator and Light Table like debugger evaluation
Posted by jpluimers on 2017/09/05
Interesting stuff:
- https://gist.github.com/lynatan/673e574faa8343fa01d7a91e75065c54 OpOverloadWithGenerics.pas which is very similar to the C# ?? null coalescing operator [WayBack]
- DLight in-line debugger evaluation which is very similar to parts from the Light Table IDE concept [WayBack] which reminds me and others of the smalltalk days [WayBack] (https://github.com/lynatan/DLight)
- RSS feed: http://feedly.com/i/subscription/feed/http://d.hatena.ne.jp/tales/rss
- Github: https://github.com/lynatan
- Gists: https://gist.github.com/lynatan
via:
- Hatena Tales 2016-10-15 [WayBack] – DLight
- Hatena Tales 2016-09-13 [WayBack] – OpOverloadWithGenerics.pas
- Wow! Very cool! An IDE Expert that displays values of watch expressions when debugging, right inside your code editor, and it’s live! – Edwin Yip – Google+ [WayBack]
- lynatan/May-the-bevel-be-with-you: Set BevelOuter property to bvLowered in compiler progress window panels.
- Restore bevels back in compiler progress dialoghttps://github.com/lynatan/May-the-bevel-be-with-you – David Berneda – Google+ [WayBack]
In more detail:
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Posted in Conference Topics, Conferences, Delphi, Development, Event, Software Development | 3 Comments »
Dark corners of Unicode / fuzzy notepad
Posted by jpluimers on 2017/04/20
You think you know Unicode? Think again, then read [Wayback] Dark corners of Unicode / fuzzy notepad.
On basics, sorting, comparison, decomposition, composition, width, whitespace, encoding, emoji, interesting code planes and dark corners. Lots of dark corners.
The examples are in Python, but hold for almost any programming language
–jeroen
via: Kristian Köhntopp
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Delphi and the joy of Compiler Intrinsics – I cant use “Length” as a TFunc…
Posted by jpluimers on 2017/04/18
One of the reasons I favour using RTL based functionality over Delphi Intrinsic Routines like Length, Abs and others is that you cannot use compiler intrinsics in Generics. For instance Length is not compatible with TFunc<string, Integer> unless you declare it yourself like function StringLength(value: string): Integer; as otherwise you get en E2029 error (in this case the cryptic '(' expected but ';' found).
It’s one of the many areas where the Delphi compiler developers took a shortcut, but in this case I think the results are somewhat good.
Other reasons for using the RTL over compiler intrinsics have to do with scoping: the intrinsics are in the global scope which can clutter what you’re trying to work on.
So I much rather use the file and stream related functions when I’m actually working with a file or stream. For instance Assign for me has nothing to do with a file outside of a file context (it’s the reason AssignFile exists in the first place).
–jeroen
via: I cant use “Length” as a TFunc (tested in XE and XE6), but if…
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Posted in Conference Topics, Conferences, Delphi, Delphi 10 Seattle, Delphi XE, Delphi XE2, Delphi XE3, Delphi XE4, Delphi XE5, Delphi XE6, Delphi XE7, Delphi XE8, Development, Event, Software Development | 1 Comment »
The Wiert Corner - irregular stream of stuff 