The Wiert Corner – irregular stream of stuff

Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘Development’ Category

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E2026 or W1023 – take your pick (:

Posted by jpluimers on 2018/08/08

[WayBack] A compiler curiosity I’ve learned today … – David Berneda – Google+: depending on if TEST is defined or not, you get E1026 or W1023.

// This works:
{$IF Declared(Test) and (Test>=100)}
{$ENDIF}

// This not:
{$IF Declared(Test)}
{$IF Test>=100} // "E2026 Constant expression expected"
{$ENDIF}
{$ENDIF}

The W1023 can be alleviated by replacing 100 with +100.

Note that both errors have been documented since at least Delphi 2007:

–jeroen

Source: A compiler curiosity I’ve learned today: // This works: {$IF Declared(Test) …

Posted in Conference Topics, Conferences, Delphi, Development, Software Development | 2 Comments »

Finally: RAD Studio August 2018 Roadmap – Embarcadero Community

Posted by jpluimers on 2018/08/07

While many were expecting the 10.3 release by now, it should now be available towards the end of 2018. If that means better quality, I’m all for it [WayBack]: RAD Studio August 2018 Roadmap – Embarcadero Community.

The slides are still in image form (I never understood the lack of PDF), but luckily there is [WayBack] August 2018 Roadmap Commentary from Product Management – Community Blogs – Embarcadero Community.

The 10.3 feature I like most is the work on records: default constructors, destructors and copy operators. This will lead the way for nullable types, on which I gave a session in 2009 on the work I did in the 2007-2009 timeframe on non-generic nullable types, and Jim on generic nullable types:

I never got around to follow up on Reminder: rebuild my Nullable Types based on Class Operators in Delphi, so hopefully the Delphi team will deliver that next year.

Via: [WayBack] Just in: RAD Studio August 2018 Roadmap (https://community.embarcadero.com/article/news/16638-rad-studio-august-2018-roadmap) and PM Commentary blog pos… – Marco Cantù – Google+

–jeroen

Posted in Delphi, Development, Software Development | Leave a Comment »

Delphi unit prefixes for VCL applications

Posted by jpluimers on 2018/08/07

When using 3rd party libraries, not all of them prefix the units they use, so I tend to use this unix prefix list:

System;Xml;Data;Datasnap;Web;Soap;Winapi;System.Win;Xml.Win;Web.Win;Soap.Win;Data.Win;Datasnap.Win;Vcl;Vcl.Imaging;Vcl.Touch;Vcl.Samples;Vcl.Shell;

Note that it leaves out ;Bde; as that is a thing from a distant past.

–jeroen

Posted in Delphi, Development, Software Development | 1 Comment »

Shouldnt this line be null terminated? HostEnt := gethostbyname(MarshaledASt…

Posted by jpluimers on 2018/08/07

[WayBack] Shouldnt this line be null terminated? HostEnt := gethostbyname(MarshaledAString(TEncoding.UTF8.GetBytes(Name))); – G+ – Allen Drennan

Yes it should, but I’m not sure if the compiler is fully to blame as GetBytes does not return a terminating zero byte.

–jeroen

Posted in Delphi, Development, Encoding, Software Development, UTF-8, UTF8 | Leave a Comment »

One more reason to disable live bindings: it throws exceptions when a project is in a project group having multiple projects upon project group load

Posted by jpluimers on 2018/08/02

This was Delphi Berlin, but Live Bindings is not much better in any other Delphi version when opening a project group having multiple applications none of which use Live Bindings:

This is how you disable them in Delphi 10.1 Berlin from the console; modify your BDS version and BPL version for other Delphi versions:

reg add "HKEY_CURRENT_USER\Software\Embarcadero\BDS\18.0\Disabled Packages" /v "$(BDSBIN)\dclbindcomp240.bpl" /t REG_SZ /d "Embarcadero LiveBindings Components" /f
reg add "HKEY_CURRENT_USER\Software\Embarcadero\BDS\18.0\Disabled Packages" /v "$(BDSBIN)\dclbindcompfmx240.bpl" /t REG_SZ /d "Embarcadero LiveBindings Components FireMonkey" /f
reg add "HKEY_CURRENT_USER\Software\Embarcadero\BDS\18.0\Disabled Packages" /v "$(BDSBIN)\dclbindcompvcl240.bpl" /t REG_SZ /d "Embarcadero LiveBindings Components VCL" /f
reg add "HKEY_CURRENT_USER\Software\Embarcadero\BDS\18.0\Disabled Packages" /v "$(BDSBIN)\dclbindcompdbx240.bpl" /t REG_SZ /d "LiveBindings Expression Components DbExpress" /f
reg add "HKEY_CURRENT_USER\Software\Embarcadero\BDS\18.0\Disabled Packages" /v "$(BDSBIN)\dclbindcompfiredac240.bpl" /t REG_SZ /d "LiveBinding Expression Components FireDac" /f

(Reminder to self: modify bitbucket.org/jeroenp/wiert.me/src/tip/Native/Delphi/Scripts/List-Delphi-Installed-Packages.ps1 so it can generate these)

Edit: I have done just that: it now understands the GenerateDisablePackagesScriptparameter so it generates a small console script to disable various packages.

In QualityCentral: 144003 – Automated Incident Report:

Read the rest of this entry »

Posted in Delphi, Development, Live Bindings, Software Development | 2 Comments »

Diffing binary files in PlasticSCM through Beyond Compare

Posted by jpluimers on 2018/08/02

The diff engine in PlasticSCM is nice in appearance, but it lacks a lot of features for file types that Beyond Compare handles out of the box.

For instance, .RES files cannot be diffed:

---------------------------
Error
---------------------------
Unsupported file types for binary diff. Only images are supported (JPEG, PNG, GIF, BMP)
---------------------------
OK   
---------------------------

Read the rest of this entry »

Posted in Beyond Compare, Development, PlasticSCM, Power User, Source Code Management | 2 Comments »

Just curious whether anyone has had experience with the Uses Cleaner written by Oleg Zhukov…

Posted by jpluimers on 2018/08/02

Reminder to self: see if there was follow-up on [WayBack] Just curious whether anyone has had experience with the Uses Cleaner written by Oleg Zhukov: http://www.olegzhukov.com/UsesCleanupceaf.zip?fileticket=R_… – Bill Meyer – Google+

File: [WayBack] http://www.olegzhukov.com/UsesCleanupceaf.zip?fileticket=R__cxggc2OA%3d&tabid=73&mid=402

–jeroen

Posted in Delphi, Development | 1 Comment »

Interesting channel with a truckload of Firemonkey FMX demos: Quark Cube – YouTube

Posted by jpluimers on 2018/08/01

[Archive.is] Quark Cube – YouTube:

We create tutorials. And all this without the usual stuff. We want to show how you can work with FireMonkey. Our tutorials are not available as source code. We want to show you a look more, and yes, we do it. Fast, reliable, targeted, unambiguous and ahead of its time. We love Delphi with FireMonkey. #ILoveDelphi

The vides are at [Archive.is] (70) Quark Cube – YouTube

Via Dave Nottage

–jeroen

Posted in Delphi, Development, FireMonkey, Software Development | Leave a Comment »

TIME_WAIT and MaxUserPort – what it is, what it does, when it’s important – Blog du Tristank

Posted by jpluimers on 2018/08/01

Despite many posts saying you can use it on other than outbound connections, lets quote that it doesn’t:

MaxUserPort controls “outbound” TCP connections

[WayBack] MaxUserPort is used to limit the number of dynamic ports available to TCP/IP applications.

…

It’s never going to be an issue affecting inbound connections.

MaxUserPort is not the right answer if you think you have an inbound connection problem.

Source: [WayBack] MaxUserPort – what it is, what it does, when it’s important – Blog du Tristank

The side of the TCP connection that closes is gets the TIME_WAIT state, which means you should avoid your server to terminate connections because it then will run out of available ports. Clients should disconnect when done (or when done for the foreseeable future) otherwise the server gets the 2MSL TIME_WAIT penalty as for instance explained by [WayBack] TIME_WAIT and its design implications for protocols and scalable client server systems – AsynchronousEvents.

The solution for inbound connections is that your TCP based protocol should enforce either the client to close the connection, or to use some form of client pooling so there is no need for many connection setup/teardowns of short lived connections.

TIME_WAIT can last for about ~10 minutes if you are unlucky.

More recommended reading:

–jeroen

Posted in Communications Development, Development, Internet protocol suite, Software Development, TCP | Leave a Comment »

On my research list: FastMM4 LogAllocatedBlocksToFile to help find pseudo “leaks”: allocations released at application end, but during run-time progressively increase memory usage

Posted by jpluimers on 2018/08/01

From a quick scan for LogAllocatedBlocksToFile, I found these links I need to dig deeper into:

This in oder to spot “leaks” at run-time that are being release at process end, but build up memory usage over time. Some might call them “live leaks”.

Basically this is a technique I used a long time ago when I wrote a memory allocation dumper and parsing tool combination in the Turbo/Borland Pascal era called “Korsakov” (I might even have updated that to Delphi 1 once, but soon in Delphi better tools became available).

Another tool that might help here is [WayBack] GitHub – yavfast/dbg-spider: Spider – Delphi profiler with docs at [WayBack] Spider – Delphi profiler:

–jeroen

Posted in Delphi, Development, Software Development | Leave a Comment »

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