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Posted by jpluimers on 2017/10/10
Given a variable I: Integer, some people like Inc(I); others like I := I + 1;.
You might think that part of that discussion nowadays should be multithreading.
In practice this does not matter: the compiler will use the same instructions for both statements.
TL;DR: This might make you think they are always atomic. But that’s not always true, as the below differences show. In addition, it can also depend on your processor archicture.
In the Win32 Delphi Compiler, this is how they look:
Posted in Delphi, Delphi 10 Seattle, Delphi 10.1 Berlin (BigBen), Delphi XE3, Delphi XE4, Delphi XE5, Delphi XE6, Delphi XE7, Delphi XE8, Development, Software Development | 5 Comments »
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:
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 »
Posted by jpluimers on 2017/08/31
If you want to set all columns to the same value, select all columns in the structure view and then (assuming
SizeStyle[WayBack] is already set tossPercent[WayBack]) set theValue[WayBack] to 0. This will trigger some automatism that makes all of the columns sized equal.
Great answer by Uwe Raabe [WayBack]
Source: Delphi How to use TGridPanel – Stack Overflow [WayBack]
–jeroen
Posted in Delphi, Delphi 10 Seattle, Delphi 10.1 Berlin (BigBen), Delphi 2009, Delphi 2010, Delphi XE, Delphi XE2, Delphi XE3, Delphi XE4, Delphi XE5, Delphi XE6, Delphi XE7, Delphi XE8, Development, Software Development | Leave a Comment »
Posted by jpluimers on 2017/08/08
Thanks Stefan Glienke for posting this a while ago:
If you ever wonder why you get no (or incomplete) RTTI from a control that you inherited from a DevExpress one – then look into cxVer.inc where it has the following lines:
{$IFNDEF CXTEST}
{$WEAKLINKRTTI ON}
{$RTTI EXPLICIT METHODS([]) FIELDS([]) PROPERTIES([])}
{$ENDIF}+Martin Wienold was wondering (and so was I at first) why he could not properly resolve a form from the DI container that inherited from TdxRibbonForm despite writing a public method with [Inject] attribute on it but it was never called.
Warning: If you are using DevExpress or any other source code that does this (changing the $RTTI directive) and build these sources together with your application (in contrast to using precompiled dcus or even packages) on a version <XE6 then you might suffer from this issue: [WayBack] #79943: {$ RTTI} flag scope which causes RTTI to disappear even from units that did not have the $RTTI in them.
Source: If you ever wonder why you get no (or incomplete) RTTI from a control that you…
Posted in Delphi, Delphi 10 Seattle, Delphi 10.1 Berlin (BigBen), Delphi 2009, Delphi 2010, Delphi x64, Delphi XE, Delphi XE2, Delphi XE3, Delphi XE4, Delphi XE5, Delphi XE6, Delphi XE7, Delphi XE8, Development, QC, Software Development | Leave a Comment »
Posted by jpluimers on 2017/05/17
Brilliant:
if it is a console program and it was started any other way (from the Windows Explorer, from the Delphi IDE with or without debugger, from another non-console program), then, before the console window can close, it will display:
Press any key...
Source: Delphi Corner Weblog: New: Velthuis.AutoConsole unit [WayBack]
via:
–jeroen
Posted in Delphi, Delphi 10 Seattle, Delphi 10.1 Berlin (BigBen), Delphi 2007, Delphi 2009, Delphi 2010, Delphi XE, Delphi XE2, Delphi XE3, Delphi XE4, Delphi XE5, Delphi XE6, Delphi XE7, Delphi XE8, Development, FastMM, Software Development | Leave a Comment »
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…
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 »
Posted by jpluimers on 2017/02/28
This book covers Dependency Injection from A to Z. In it you’ll learn about Constructor Injection, Property Injection, and Method Injection. You’ll learn about the right and wrong way to use the Dependency Injection Container.
Source: Dependency Injection In Delphi by Nick Hodges [Leanpub PDF/iPad/Kindle]
This is the Chapter List:
- What is Dependency Injection
- Benefits of Dependency Injection
- Constructor Injection
- Property Injection
- Method Injection
- Using the Container
- A Simple Migration Example
- Advanced Uses of the Container
- Dependency Injection Anti-patterns
- A Full, Useful Example
- Final Thoughts
–jeroen
Source: New book by +Nick Hodges tech preview by +Stefan Glienke https://leanpub.com/…
Posted in Delphi, Delphi 10 Seattle, Delphi 10.1 Berlin (BigBen), Delphi 2010, Delphi XE, Delphi XE2, Delphi XE3, Delphi XE4, Delphi XE5, Delphi XE6, Delphi XE7, Delphi XE8, Development, Software Development | Leave a Comment »
Posted by jpluimers on 2017/02/23
the release of 1.2 is almost there! We are working hard to deliver it shortly after the next Delphi release which will happen … soonish, I think. ;)
The release/1.2 branch has been around for a while – please take a look if you haven’t already. It contains a lot of new features and bugfixes. I will tell you more about some of the amazing features next time which won’t take as long as it took since the last blog post – promise. :)
Apart from a very interesting take on DI resolvers, the above great info too!
Please take a look at spring4d/branch/release/1.2 as it has been very stable for quite some time.
Source: [WayBack]: Delphi sorcery: Generics, modules and typeinfo
–jeroen
via: [WayBack] Finally some blog article again ;) – Stefan Glienke – Google+
Posted in Delphi, Delphi 10 Seattle, Delphi 10.1 Berlin (BigBen), Delphi 2010, Delphi XE, Delphi XE2, Delphi XE3, Delphi XE4, Delphi XE5, Delphi XE6, Delphi XE7, Delphi XE8, Development, Software Development | Leave a Comment »
Posted by jpluimers on 2017/02/15
One day I will need lots of hashing in Delphi: Xor-el/HashLib4Pascal: HashLib4Pascal is a Delphi/FPC compatible library that provides an easy to use interface for computing hashes and checksums of strings (with a specified encoding), files, streams, byte arrays and untyped data to mention but a few. [WayBack]
via: Hello all,I made a port of “HashLib” (http://hashlib.codeplex.com/) “with some fixes, additions and modifications” for Delphi (2010 ( I hope ) and above)… – Ugochukwu Mmaduekwe – Google+ [WayBack]
It’s a port of the C# HashLib – Home [WayBack]
Another fork is at https://github.com/bonesoul/HashLib
–jeroen
Posted in .NET, C#, Delphi, Delphi 10 Seattle, Delphi 10.1 Berlin (BigBen), Delphi 2010, Delphi XE, Delphi XE2, Delphi XE3, Delphi XE4, Delphi XE5, Delphi XE6, Delphi XE7, Delphi XE8, Development, Encoding, FreePascal, Pascal, Software Development | Leave a Comment »
Posted by jpluimers on 2017/02/07
A long time ago, Thomas Mueller (dummzeuch) – Google+ reminded [WayBack] me of this which I required a short while ago:
You can use
AcquireExceptionObject():AcquireExceptionObject returns a pointer to the current exception object and prevents the exception object from being deallocated when the current exception handler exits.
Then you can send the pointer to another thread and if you raise it there it will be freed for you, otherwise you must call
ReleaseExceptionObject()to free it.
After the answer by Remy Lebeau [WayBack] and Remko [WayBack] is a comment [WayBack] by mghie [WayBack] that mentions AsyncCalls.pas that now is available on GitHub [WayBack].
If you have a very old (version <= 5) Delphi or just want to look at how AcquireExceptionObject [WayBack] looks like just look at a similar implementation there [WayBack]. Note that instead of the ReleaseExceptionObject [WayBack] call, AsyncCalls re-raises the exception [WayBack].
–jeroen
Posted in Delphi, Delphi 10 Seattle, Delphi 10.1 Berlin (BigBen), Delphi 2007, Delphi 2009, Delphi 2010, Delphi 5, Delphi XE, Delphi XE2, Delphi XE3, Delphi XE4, Delphi XE5, Delphi XE6, Delphi XE7, Delphi XE8, Development, Software Development | Leave a Comment »
The Wiert Corner - irregular stream of stuff 