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  1. Most likely this: https://quality.embarcadero.com/browse/RSP-30870
  2. Lars Fosdal

    The future of Delphi

    I am not confused. I am frustrated. I want both. Most of all, I want 64-bit debuggers that understand threads and make it easy and robust to focus debugging on specific threads, and that doesn't suddenly stop breaking on breakpoints or break on "invisible" breakpoints in Indy, or just purely stop responding completely. I'd love to be able to "disable" exception breaks for specific threads and only for those threads. I want the broken HighDPI properly and finally fixed. I want the code generation significantly improved for 64-bit. I want RTL, VCL and FireMonkey to be rock solid and efficient. But - also ... I want Generics constraints for enumerated types so that I can use enumerated type and set type operators. I want proper nullable type support, including the relevant operators. I want ARM support for Windows. I want ARM/Linux support for Raspberry PI. I want the static code analysis capabilities of FixInsight and similar, to be built into the DSP. I want a package manager that really works, unlike GetIt which is just a glorified downloader and installer. I want Swagger support for APIs.
  3. Hello World, I just had a pleasant surprise - when I build a certain x64 project of mine, the executable is noticeably smaller under Delphi 11 Alexandria (6.5 MB) than under Delphi 10.4.2 Sydney (7.3 MB). Embarcadero must have done some serious optimizations. (Edit) the project is compiled with {$WEAKLINKRTTI ON}.
  4. Same here. PyScripter Delphi 10.4: 17,302 KB PyScripter Delphi 11: 15,523 KB 10% reduction, not bad. Any idea where this is coming from (generics?) Probably the first Delphi version that produces smaller executables that its predecessor.
  5. David Heffernan

    The future of Delphi

    I don't think it should be either or, why can't we have both? Instead if often seems that we have neither.
  6. Back when Delphi was owned by Borland, they had a fairly generous policy towards handing out free copies of their software products. Their actual "Cost of Goods" was tangible since back then sofware came on disks and there were always books included in the boxes. (Delphi itself was given out free to everybody who attended the launch event in 1995. I was there! And lots of free stuff was handed out at all sorts of conferences throughout the 90's. But those things have faded out, along with User Groups and similar in-person events. I did do a local in-person event as an MVP a few years ago, and they refused to give me a free license to raffle off. But they did send a bunch of pens and note-pads -- at far greater actual expense than a license code sent via email.) Today you have to pay to get a DVD if you want a physical copy on disk. The COGs is ZERO. Yet Embt fails to see the value in giving away licenses for any number of valid reasons that used to be commonplace. Even MVPs only get a license that's valid for 365 days. Even though the COGs for Delphi are ZERO, they build-in a 4% automatic increase in the maintenance agreement every year. When was the last time anybody here got even close to a 4% raise from their current employer? I don't think I've EVER gotten a raise over 2.5% without changing jobs. Honestly, I may be done upgrading Delphi. I let my maintenance agreement lapse just before D11 was released and I'm not missing it a bit. The whole world is moving towards web-based products and the only thing in D11 of any consequence is support for Microsoft's new Windows update -- because I suspect most of the revenues for Delphi come from thousands of corporations who are beholden to Microsoft and will all be upgrading (whether they like it or not) over the next 6 months or so. This creates a lot of maintenance work, which seems to be the only thing anybody hires Delphi people for today. Nobody is building web stuff using Delphi. Most companies are moving towards a "mobile-first" approach to apps, and even that is being dominated by Microsoft in many shops. Which means C# and .NET. Hobbiests are not buying Delphi for its cross-platform benefits because all the tools and libraries needed have FOSS licenses. But TMS has this thing called WebCore and you can build web apps in Delphi with it. In fact, you can even use Visual Studio Code, which is free, instead of the Dephi IDE. They just made all of their FNC components so you can add them to VSC, quadrupling the number of components available for WebCore apps. And they're preparing an update to their "wrapper" technology (Miletus) that's like Electron and lets you take a web app and turn it into a native app. The next version will support more platforms than Delphi, including Raspberry Pi's. I have an ALL-ACCESS license from TMS and the annual cost to renew it is less than half of my Delphi Enterprise license. It doesn't automatically increase by 4% annually, and it buys me a collection of tools that offer far more flexibility and relevance in today's market. They're also not afraid to add valueable things to the language that WebCore supports (Object Pascal) that people have been asking for in Delphi for ages. They're constantly adding more and more cool things to their platform; it's enough to make your head spin. Meanwhile, this latest Delphi release had nothing new that I need in it. It doesn't even fix the Refactoring bugs introduced in the last couple of 10.4 releases. They still charged 4% more for it again; but to me, it failed to deliver even 4% more value over 10.4.2. If I look at what has happened with Delphi over the past 12 months, and at what WebCore has done, there's no comparison. WebCore is moving faster in directions that the market is embracing, while Delphi is simply providing support for the latest version of Windows, hoping to justify its existence for Corporate IT Depts who need to decide whether to write a check to keep the maintenance releases coming or not while all of their new development is being done with other tools. And here we are debating on whether this huge billion-dollar corporation can afford to give a comp license (that doesn't cost them a penny) to a guy who has contributed more value to the Delphi community than most of the new features and bugs they ship with every update they put out. Same debate, different year. I think the problem is that most Corporations are very slow to move new Delphi releases into production, so they don't miss delays in updates for big component libs and things like what Andreus does because they do make it out sooner or later anyway. I think Embt is really only interested in Corporations because they just keep renewing their licenses and don't do much otherwise. They don't care about language features, only whether it supports the latest Microsoft Windows needs.
  7. Small video showing how to embed any part of (or whole) PDF, PowerPoint, Excel, Word, Outlook, document into report. Document is embedded in vector format and is editable (can be changed in built in HTML Editor). https://s9.gifyu.com/images/rb5bba15035de9053c.gif
  8. Angus Robertson

    ICS V8.67 announced

    ICS V8.67 has been released at: http://wiki.overbyte.eu/wiki/index.php/ICS_Download ICS is a free internet component library for Delphi 7, 2006 to 2010, XE to XE8, 10 Seattle, 10.1 Berlin, 10.2 Tokyo, 10.3 Rio, 10.4 Sydney and 11.0 and C++ Builder 2006 to XE3, 10.2 Tokyo, 10.3 Rio, 10.4 Sydney and 11.0. ICS supports VCL and FMX, Win32, Win64 and MacOS 32-bit targets. The distribution zip includes the latest OpenSSL 1.1.1i win32, with OpenSSL 3.0 and Win64 versions of OpenSSL being available from the download page. Changes in ICS V8.67 include: 1 - Added support and packages for RAD Studio 11.0. Updated SSL/TLS root certificate bundles, old certificates gone, new ones added, nothing major. 2 - Added support for OpenSSL 3.0 which is a major new release, primarily a lot of internal changes to ease long term support. There is an optional FIPS module with 3.0 but not available here since our DLLs are not built to the standards required for certification. The old engines for special extensions are replaced by new more versatile providers of which the FIPS module is one, a provider legacy.dll has obsolete ciphers and hash digests, including MD2, MD4, Blowfish, DES, IDEA, RC2, RC4, SEED, that most applications no longer need and which needs to loaded by the application by setting global variable GSSLEAY_LOAD_LEGACY to true before loading OpenSSL. 3 - OpenSSL 3.0 does not offer any specific new features of benefit to ICS at present, although HTTP/3 support is planned for 3.1 or later, so the main ICS distribution retains OpenSSL 1.1.1i which is fully supported until September 2023. OpenSSL 3.0 may be downloaded from the download page. There are two global variables to restrict which OpenSSL version is loaded, GSSLEAY_DLL_IgnoreNew set true will ignore 3.0, while GSSLEAY_DLL_IgnoreOld will ignore 1.1.1, if both sets of DLLs are available in the same directory. The main SSL samples all set these globals, which can be changed for testing one version or the other, or set by the application, but must be before OpenSSL is initialised. 4 - The main implication for ICS with OpenSSL 3.0 is for SSL/TLS certificate private keys saved with password protection, which is required for PKCS12 certificates for importing into the Windows certificate store. The new PKCS12 default password encryption AES256 is not recognised until Windows Server 2016 v1709 and Windows 10 v1709, so Server 2012, Windows 10 RTM and earlier won't load AES passworded keys, only 3DES, for which the legacy.dll must be loaded. 5 - The TX509Base class has various improvements. The ValidateCertChain method reports CA roots for multiple certificate verification paths with two or more intermediate certificates, rather than only the last. The CertMainInfo method provides a single line with the main certificate information. 6 - There are two new classes to write and read SSL/TLS certificates to and from the Windows Certificate Store, including private keys. This is primarily so Let's Encrypt certificates can be installed automatically for use with the IIS web server. TMsX509List descends from TX509List adding a method LoadFromStore to load the list from a Windows certificate store by store name TMsCertStore and location MsCertLocation. For My/Personal store, attempts to load private keys if they are allowed to be exported unencrypted. TMsCertTools descends from TSslCertTools adding methods SaveToStorePfx and LoadFromMyStore to access Windows certificate stores. Note access to the Local Machine Store for web server certificates requires administrator rights. 7 - Various improvements for the OverbyteIcsPemTool sample. It includes new buttons to list the contents of Windows certificate and private key stores and allow old items to be deleted. This may be useful for cleaning up old certificates and private keys from the Windows stores. Added ResavePrivateKey and Resave Private Key menu option which prompt for a PFX or PEM file containing an encrypted private key with a new cipher, renaming old file to .oldpem/pfx. Specifically for files saved with old ciphers than OpenSSL 3.0 does not support as standard if required for older versions of Windows. Displaying certificates and bundles is no longer a new modal window, but updates the existing log window. Improved import certificates from Windows certificate store to use TMsX509List instead of Windows API calls, and to access all Windows store locations instead of just user, specifically the Local Machine store where server certificates are located. 8 - For the TX509Certs component, the default cipher for encrypting PFX/P12 files is now PrivKeyEncAES256 with 3.0 unless the legacy DLL is loaded when still PrivKeyEncTripleDES so older versions of Windows can load them. Changed extraction of download PEM bundle so that main certificate does not need to be first in file, log them all, and ignore any self signed root certificates. If testing dns-01 challenge fails, rotate to next public server and three retries (previously only happened on timeout). When saving files with private keys, log encryption type used. Added more certificate output formats, OutFmtPwPem and OutFmtPwP12 specify whether to password PEM and P12/PFX private keys. Note Windows always needs passworded P12/PRX files, while Apache web server only accepts PEM files without a password. Allow automatic installation of new certificates to the Windows Certificate Store so they can be used by IIS web sites, by setting output format to OutFmtWinStore. Note application must have administrator rights to do this. 9 - Fixed two problems in the FTP client, support option ftpFixPasvLanIP for PUT/APPE uploads as well as downloads, and support IPv6 for PUT/APPE uploads as well as downloads. 10 - Fixed a problem in TIcsMailQueue with sequential number generation to avoid file locking errors and unicode BOM corrupting file, generate large random number for errors instead of reverting to 1. Don't save BOM withunicode compilers. 11 - In the Application Web Server TSslHttpAppSrv, added an optional LastModified parameter to the AnswerStream, AnswerPage, and AnswerString methods to avoid adding a custom header line with the date. Added NO_CACHE_EX and NO_STORE_EX literals. Added PUT and DELETE verb handlers, similar to GET and POST. 12 - For the HTTP client TSslHttpCli, fixed a relocation problem where the Location: header included a path with a space, encode the space. Fixed another relocation problem where HEAD sometimes stalled. Remove # fragment or anchor from URL in relocation, only used by browsers and not by servers. 13 - In the TIcsBlackList component, Internally use BlockedFlag instead of setting attempts to 9999 once the actual maximum failed attempts is reached, so we can keep counting attempts. 14 - Added a new SSL sample, OverbyteIcsDDWebService.dpr which is very similar to OverbyteIcsSslMultiWebServ.dpr, but designed as a Windows service, although it will also run as a GUI for debugging. It requires DDService service framework to be installed from https://www.magsys.co.uk/delphi/ddservice. asp. It also includes a REST server with simple lookup responses from a SQL database, which optionally requires DISQLite3 5.36.5 or later to be installed from http://www.yunqa.de. Note this sample in not in the project groups due to these pre-requisites. 15 - Moved TRestParams from the OverbyteIcsSslHttpRest unit to OverbyteIcsUrl to ease circular references. Added a new method AddItemNULL to add a null, in Json this will be unquoted. Added a new TRestParamsSrv component which provides methods for creating REST server Json responses from a SQL database resultset, one or more rows, also error responses. Note this is only compiled if DATABASE is defined in OverbyteIcsDefs.inc to avoid bringing in database units that are not available on all Delphi editions. There is a REST server sample OverbyteIcsDDWebService.dpr that illustrates SQL lookups. 16 - In the proxy component TIcsHttpProxy, don't send an HTTP request header until after HTTP body has been processed in case the body length changes. HTTP Forward Proxy using HTTP works again, broken in V8.65. Using HTTP Forward Proxy, convert absolute URL to path only since some servers can not process an absolute URL and sulk. 17 - In the Jose unit, rewrote the functions converting private keys to and from Json Web Keys with new OpenSSL 3.0 provider functions. Use AnsiStrings and functions when dealing with binary data to avoid possible issues with string conversions and nulls. Json now created with TRestParams. 18 - Added two new sample project groups, OtherDemos64 and SslDemos64 which include Win64 versions of all the main active samples with 64 added to the project name, so they can be regularly built alongside the Win32 versions without changing platforms and overwriting executables.
  9. Anders Melander

    Menu captions with images are hard to read under Windows 11

    16 colors ought to be enough for anybody? 🙂
  10. David Schwartz

    The future of Delphi

    It's all find and dandy to come up with all sorts of ideas that we as developers would love to see. But I believe that the reality is that most of the revenues come from corporations who are mostly interested in risk-reduction, not more usable software. I don't believe that EMBT is making most of their revenues from Delphi products because they're being actively used for new product development. Rather, I believe it's coming from corporations that built large apps between 2000 and 2010, and those apps are still producing strong revenues with modest investment in maintenance. These customers have been just running things as-is for the past 10-15 years, and they invest in minor updates to keep them operational. I believe the latest language enhancements are ignored, as are most of the new features. These customers simply keep renewing the maintenance agreements because it's the least-cost thing to do that minimizes their risks in case something unexpected happens. As one of the devs at a place I worked in 2009 liked to say, "We're all here just keeping a comatose patient alive long enough for them to migrate this project over to .NET." During the short time I was there, they missed the first two major milestones for that migration, and the schedule got pushed out by an additional year. The company was REALLY upset when Microsoft announced they were end-of-lifing Windows XP. I mean, these guys were so paranoid of changes to Delphi's math libs that they spent months running a HUGE bunch of regression tests on every new Delphi release looking for deviations in calculations less than 10^-6. Newer releases past D6 failed, and with MS abandoning XP meant it could cost them billions of dollars due to even the tiniest deviations in math calculations. I tried to move them to D2010, but one of their devs built some components that would make most folks here faint due to their total non-conformance with component building guidelines, and they wouldn't build properly under D2010. That's not to say there isn't new development and even innovation going on with Delphi in shops around the world. But it explains why the language itself is at least 10 years behind most contemporary languages; why the most urgent updates to the platform actually track updates that Microsoft, and now Apple, make in their latest hardware and/or software releases; why the run-time technology (like high-DPI stuff) hasn't gotten much attention (because most applications are running on machines barely capable of displaying full HD resolution); and why nothing reflects much concern for anything other than Microsoft, Windows, and making the run-time libs more similar to C# libraries than anything else (IMHO). ********************** If you want to see REAL INNOVATION in this space, take a look at what TMS Software is doing. They've created a more intentional and cohesive extension of the Delphi platform in the past 18 months than EMBT has done since they bought the company from CodeGear. I can't say for sure, but I suspect a larger percentage of their revenues come from developers who have a larger say in their future wants, needs, and desires than your average IT Manager or CIO. They're actually intersted in things that are not tied to Microsoft or Apple and extend into a more homogeneous cross-platform ecosystem that has web development in the center of everything. They are solving difficult multi-platform problems that EMBT should have been working on for 5+ years now if they really cared. And they are not waiting for EMBT to address any of the shortcomings they may encounter. One of their key players, Dr. Holger Flick, has written and published three (3) new books in the past 18 months, with more coming! With TMS tools, you don't even need Delphi to build Delphi apps that run in more platforms than EMBT supports TODAY! (See the screen-shot below) You can build them in Visual Studio Code, and using Lazarus you can even build executables that run natively on Linux machines without having to spend thousands of dollars on an "Enterprise Edition" Delphi license. We don't need more threads trying to lay out a direction that EMBT can take to make Delphi nicer for Developers, because Developers are clearly not EMBT's target market. (I don't know about you, but in the past 15 years, I've been the only person every place I've worked who had my own personal Delphi license to ensure I could keep up with new developments. That's because the production code at most places was a few releases behind the latest Delphi release.) Get invovled with TMS products and see if there's something there worth focusing on. Not their older VCL, FMX, and Intraweb (gawd, is that still around?) libs, but the newer WebCore, FNC, and Business Suite stuff. Their next release of WebCore will let you create web apps that run natively in more platforms than Delphi supports, including Raspberry Pi -- without requiring you to have access to a compiler that generates ARM code. And you won't need to have your dev machine tethered to another dev environment to do cross-compiles. (I know this is going to raise some hackles, so ... I say it's "native" because there's a wrapper that runs as a native app and it allows the code encapsulated inside of it to run within a web browser. There's no hardware that runs javascript in the same way there's nothing that runs java bytecode.) The photo below is a snapshot from a video they posted recently illustrating support for the Raspberry Pi. that shows the platforms WebCore will support in its next release (which will probably be out before EMBT releases their first "bug-fix" update for D11) using either Delphi or VSC as your dev platform. Their strategy does NOT depend on what Microsoft or Apple may or may not do, or what the next release of .NET or iOS might provide. WebCore targets javascript running in the web browser, which is becoming more universal than Windows. I invite all Delphi developers to stop complaining about what EMBT is NOT doing and start cheering on and supporting these guys who are actually INNOVATING around the Delphi language and EXPANDING the Dephi ecosystem -- RAPIDLY! (Buffalo Springfield's song, "For What It's Worth" is echoing in my head...)
  11. Dalija Prasnikar

    How to manage feature changes during release cycle?

    Main issue with branches are merge conflicts. They tend to get worse with time because more code is added and there is potentially more conflict. So naturally, if you have short lived branches there is less possibility for conflicts to emerge. Also continuous delivery focuses on making small incremental changes (which is not always possible) so making small features that don't span across too much code (files) tend to be easily mergeable. Having said that, the lifetime alone actually means nothing. Nor the number of branches. First, you can easily shoot yourself in the foot with the branch old just a few hours, if you change some "hard" to merge file - think something like dproj file. On iOS, macOS that would be storyboards - you don't even need multiple developers to make a mess. So for some types of files, you will need to have specific instructions about who and how can change them without causing issues. Next, it is not how long branch lives, but whether you keep it up to date with other development. If you have branch and you merge it after a year, of course there will be trouble, but not because the branch is year old, but because you didn't keep it up. The most important rule is don't merge, rebase and rebase often. Not only that keeps history cleaner, but you will also have less conflicts - most of the time there will be none or they will be simple to resolve. And of course, in larger teams there has to be some coordination between what is done and when. It makes no sense to start some large refactoring in one part of the code few days before another large refactoring in overlapping area of the code is finished. It is better to wait than waste time on merging.
  12. Fr0sT.Brutal

    How to manage feature changes during release cycle?

    From me: Don't make videos for coding stuff!!!
  13. But you would be in "Delphi Heaven", not "DLL Hell".
  14. x86 PyScripter Delphi 10.4: 11,975 KB PyScripter Delphi 11: 10,326 K 14% reduction!!
  15. Fr0sT.Brutal

    Installer (Innosetup) - welcome page yes or no?

    Back in old times when I was trying lots of soft, I had numerous setup files sometimes named like BWDSQHSetup.exe which I downloaded months ago and I was really glad to see a welcome screen which not only mentioned it will install "MookaWooka Pro" but also contained a few words about what the hell that soft is
  16. Darian Miller

    Internationalizing Applications

    Check out
  17. David Heffernan

    How to manage feature changes during release cycle?

    Merge conflicts happen whether or not the team is using branches or all developing on a single branch. If there are never any conflicts then it doesn't make much difference if you use branches or not. If there are conflicts then they can be a massive problem on long lived branches. But if there are no branches then they are also a massive problem. Often developments are in flux. Devs try something. Realise it was the wrong idea. Try something else, and so on. If this happens without branches then everyone has to deal with the conflicts over and over again. That's more work. Well managed branches make this easier. There never are magic bullet solutions for tough problems like this. You have to keep an open mind and do what works best for their teams.
  18. Remy Lebeau

    Interfaces defined in base classes

    No, it is not a valid cast, in this case. Obj is declared as IInterface, so it is pointing at the IInterface portion of the TMyClass object. But the object also has other portions in it, for TMyBaseClass, TInterfacedObject, IMyInterface, etc (not drawn exactly as the compiler lays it out, but you should get the idea): ------------------- | TMyClass | | ---------------- | <- Obj points here | | IInterface | | | ---------------- | | ---------------- | | | IMyInterface | | | ---------------- | | ... | ------------------- You are type-casting Obj AS-IS from IInterface to IMyInterface, which tells the compiler to MIS-interpret Obj as pointing to the IMyInterface portion of the object EVEN-THOUGH it is actually pointing at the IInterface portion of the object. Whereas the 'as' operator and Support() function, which use QueryInterface() internally, will return a pointer that properly points to the IMyInterface portion of the object, eg: ------------------- | TMyClass | | ---------------- | <- IMyInterface(Obj) points here | | IInterface | | | ---------------- | | ---------------- | <- (Obj as IMyInterface) points here! | | IMyInterface | | | ---------------- | | ... | ------------------- So, when you call IMyInterface(Obj).DoesNothing(), you are calling DoesNothing() on an invalid IMyInterface, so it does not access the correct area of the TMyClass object. In order for the compiler to access the members of a TMyClass object through an IInterface pointer, an IMyInterface pointer, a TMyBaseClass pointer, etc, the pointer has to be ADJUSTED according to the offset of the pointer's dereferenced type in relation to the implementation class. The compiler knows the offset of the IInterface portion of TMyClass, so given an IInterface pointer it knows how to adjust that pointer to reach TMyClass. Same with IMyInterface, etc. Thus, it adjusts a pointer according to the pointer's DECLARED type. So, if you start out with an invalid pointer to begin with, those adjustments are not performed correctly, and you end up with bad behaviors, such as crashes, corrupted data, etc. That works only if SomeVariable is pointing at the memory address where a valid IWhatever exists. Because you altered the layout of the object in memory, but didn't update your pointer usage accordingly.
  19. Uwe Raabe

    Format uses clause

    Good suggestion! I will note a feature request for it.
  20. RDP1974

    PGPool Linux Apache top performance Delphi11

    100 concurrent users querying pgsql (to see scalability of the stack httpd with db) same setup test done with latest PHP (jit) and pooling enabled is doing 3000 reqs/sec delphi llvm linux apache with pooling 15000 reqs/sec (5x!!! the throughput of the php)
  21. Attila Kovacs

    How to manage feature changes during release cycle?

    Can we see a "branch" example with 10+ projects having own code, shared code, 10+ major 3rd party libs, tons of binary data, whatever I forgot to mention. Asking for a firend.
  22. Joseph MItzen

    Using Expressions in the Group By Clause in Interbase

    They added Common Table Expressions 8 years after PostgreSQL (although they still don't have the recursive option, which PostgreSQL has had for 11 years now), tablespaces 15 years after PostgreSQL... they still don't support partial indexes, functional indexes, window functions, UPSERT, full text search or even timestamp with timezone. No compression support, materialized views, partition support... Their marketing material still brags about being "SQL-92 compliant". It's only been in the last few years that Embarcadero has made any user-facing improvements at all to Interbase. I remember a blog post by MVP Warren Postma several years ago about the Interbase Developer Edition shutting down after four hours (I think it's up to 48 hours now) and how ridiculous that is given that SQL Server, Oracle, etc. give free developer editions without the forced shutdowns. David Intersimone appeared in the comments and said that four hours was plenty of time to test any code and they didn't want people stealing the database. Warren, MVP status be damned, asked David why anyone would go through all the trouble of stealing Interbase when there were much better databases they could have for free? David didn't respond to that. Even SQLite offers window functions, partial indexes, functional indexes, JSON support, full text search, UPSERT and common table expressions with recursion now. (It's actually a damn fine database for performing data analysis on the desktop now; I'd choose it for business intelligence or analytics work over Interbase in a heartbeat). I leave you with four more quotes to ponder....
  23. 0x8000FFFF

    Why empty dynamic arrays = NIL?

    I'm quite happy that I don't need any string.IsNullOrEmpty all over the place in my Delphi code as opposed to C#.
  24. Stefan Glienke

    Why empty dynamic arrays = NIL?

    Because a pointer to empty would be quite stupid. While you can technically build an allocated array with a capacity of zero with some hacking the RTL always cleans up the memory as soon as an arrays length becomes 0. Fun fact - checking against nil for the purpose of "is it empty or not" opposed to comparing Length to 0 is slightly faster: procedure test(const a: TBytes); begin if a <> nil then Writeln; if Length(a) > 0 then Writeln; end; CheckArray.dpr.12: begin 0041D57C 53 push ebx 0041D57D 8BD8 mov ebx,eax CheckArray.dpr.13: if a <> nil then 0041D57F 85DB test ebx,ebx 0041D581 740F jz $0041d592 CheckArray.dpr.14: Writeln; 0041D583 A1B4254200 mov eax,[$004225b4] 0041D588 E8CF7DFEFF call @WriteLn 0041D58D E8B270FEFF call @_IOTest CheckArray.dpr.15: if Length(a) > 0 then 0041D592 8BC3 mov eax,ebx 0041D594 85C0 test eax,eax 0041D596 7405 jz $0041d59d 0041D598 83E804 sub eax,$04 0041D59B 8B00 mov eax,[eax] 0041D59D 85C0 test eax,eax 0041D59F 7E0F jle $0041d5b0 CheckArray.dpr.16: Writeln; 0041D5A1 A1B4254200 mov eax,[$004225b4] 0041D5A6 E8B17DFEFF call @WriteLn 0041D5AB E89470FEFF call @_IOTest CheckArray.dpr.17: end; 0041D5B0 5B pop ebx 0041D5B1 C3 ret
  25. Vincent Parrett

    Delphi Package Manager - choices?

    Nice in theory, not really doable though - they are all so different because we all have different ideas.
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