Posted by jpluimers on 2019/08/06
On my list of things to try: [WayBack] GitHub – Purik/AIO: Coroutine-based multithreading library for Delphi which are similar to what golang does.
Coroutine-based multithreading library for Delphi. Contribute to Purik/AIO development by creating an account on GitHub.
Via [WayBack] What you think about coroutine-based multithreading concurrency in Delphi like GoLang https://github.com/Purik/AIO Probably evolution paths, actuality… – Павел Миненков – Google+
–jeroen
Posted in Delphi, Development, Go (golang), Software Development | Leave a Comment »
Posted by jpluimers on 2019/08/06
Curious, but somehow shortening the library path solved the problem Alberto had: [WayBack] Hello Everybody, I have an application developed in XE2 (Hot Fix 2 + IDE Fix Pack installed) that has started giving me the “out of memory” error message… – Alberto Paganini – Google+:
Alberto Paganini
It turned out the length of the library path was the culprit of the IDE out of memory error messages.
I have reduced the length of the library path and the error messages have reduced dramatically.
There are still a few out of memory messages tho.
–jeroen
Posted in Delphi, Delphi XE2, Development, Software Development | Leave a Comment »
Posted by jpluimers on 2019/07/31
A well balanced post that shows what you can attain by thinking in advance and remembering backward compatibility: [WayBack] New in 10.2.2: Component icons – Community Blogs – Embarcadero Community
Larger icons can now be in PNG format (future IDE versions will use 128×128 for HiDPI screens) so older IDE versions do not get confused. Since newer IDE versions prefer PNG over BMP icons, backward compatibility is easier.
Via: [WayBack] A look at the new component icons in 10.2.2. – David Millington – Google+
–jeroen
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Posted by jpluimers on 2019/07/31
Patching code at debug-time: [WayBack] It’s a blong, blong, blong road…: ‘What if?’ scenario analysis in the CPU window.
Remember:
I’ve done this for 20+ years and usually use the $90 byte (NOP instruction) though your experience may be different.
–jeroen
Posted in Debugging, Delphi, Development, Pascal, Software Development, Turbo Pascal | Leave a Comment »
Posted by jpluimers on 2019/07/30
A race condition can be this small:
if Assigned(Setting.OnChanged) then Setting.OnChanged(Setting);
If in between these lines, the value of Setting.OnChanged becomes nil, then you have an access violation.
It is a very slim, but real chance.
–jeroen
Posted in Delphi, Development, Multi-Threading / Concurrency, Software Development | 4 Comments »
Posted by jpluimers on 2019/07/25
Need to check on this compiler error that you can solve by moving the generic class TExceptionThread<T> from the implementation section of a unit to the interface section.
[dcc32 Error] Test.ExceptionLogging.pas(246): E2506 Method of parameterized type declared in interface section must not use local symbol 'TExceptionThread`1'
My gut feeling is that that this either has to do with RTTI generation, or is a limitation of the compiler.
I need to trim that one done since it does not match any of these:
program which does not even distinguish interface and implementation.–jeroen
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Posted by jpluimers on 2019/07/24
Blast from the past: [WayBack] delphi – Why variables are declared as TStrings and created as TStringList? – Stack Overflow
Q
Why variables are declared as
TStringsand created asTStringList?A
Because that way you could put another
TStringsdescendant in theSLvariable (I’d probably call thatStrings, notSL).In your case, that is moot, since the logic around
SLcontains the creation of aTStringListand no external assignment or parameter parsing.But if you ever split the logic away from the assignment, then you could benefit from using any
TStringsdescendant.For instance, a
TMemoy.Lines,TListBox.Items,TComboBox.Items, etc.
From the outside it looks like they areTStrings, but internally they do not use aTStringListbut their own descendant.A few examples of classes that descend from
TStrings:source\DUnit\Contrib\DUnitWizard\Source\DelphiExperts\Common\XP_OTAEditorUtils.pas: TXPEditorStrings = class(TStrings) source\fmx\FMX.ListBox.pas: TListBoxStrings = class(TStrings) source\fmx\FMX.Memo.pas: TMemoLines = class(TStrings) source\rtl\common\System.Classes.pas: TStringList = class(TStrings) source\vcl\Vcl.ComCtrls.pas: TTabStrings = class(TStrings) TTreeStrings = class(TStrings) TRichEditStrings = class(TStrings) source\vcl\Vcl.ExtCtrls.pas: TPageAccess = class(TStrings) THeaderStrings = class(TStrings) source\vcl\Vcl.Grids.pas: TStringGridStrings = class(TStrings) TStringSparseList = class(TStrings) source\vcl\Vcl.Outline.pas: TOutlineStrings = class(TStrings) source\vcl\Vcl.StdCtrls.pas: TCustomComboBoxStrings = class(TStrings) TMemoStrings = class(TStrings) TListBoxStrings = class(TStrings) source\vcl\Vcl.TabNotBk.pas: TTabPageAccess = class(TStrings)
–jeroen
Posted in Conference Topics, Conferences, Delphi, Development, Event, Software Development | 1 Comment »
Posted by jpluimers on 2019/07/23
A while back, I posted the “profiling” CommitStrip on[WayBack] Profiling – Jeroen Wiert Pluimers – Google+. Boy how did I not know that within a week, I bumped into a “laptop fan profiling” artefact.
A coworker noticed, that when starting a thread based equivalent of [WayBack] TTimer Class (which cannot be used in services as it depends on the VCL), then sometimes the laptop fans would spin up.
What basically happened was that for certain combinations of Enabled and Interval the Execute would loop burning 100% of one CPU core.
With 3 or more – sometimes 2 – of these threads active on a 4+4 core (4 are hyper-threaded), the processor fan would start to spin like madness.
Finding the solution was somewhat easy too:
Focussing on one thread, allowed a close inspection of the loop, quickly finding the actual cause and repairing it.
A similar and better class is at [WayBack] multithreading – TTimerThread – Threaded timer class – Code Review Stack Exchange, based on [WayBack] timer – Using VCL TTimer in Delphi console application – Stack Overflow.
Posted in Conference Topics, Conferences, Debugging, Delphi, Development, Event, Fun, Multi-Threading / Concurrency, Profiling-Performance-Measurement, Software Development | Leave a Comment »
Posted by jpluimers on 2019/07/23
Blast from the past, but still relevant: [WayBack] Namespaces in Delphi – Stack Overflow:
Q
Are there any practical benefits in using long unit file names like MyLib.MyUtils.pas or it is just a kind of unit name prefix?
A
Namespaces, like all identifiers, are meant to organize.
So using them, only benefits if your project gets organized in a better way. This is highly subjective matter (there have been ‘wars’ on even the most simple naming conventions!), so impossible to really answer.
[WayBack] Here is some documentation on how namespaces work in Delphi.
Note that ‘true’ namespaces (where more than one generic DLL can contribute to the same namespace; this is how namespaces function in the .NET world) are not possible in Delphi: you could go the BPL way, but that is not the same as a ‘generic DLL’. This is not a limitation of Delphi itself, but the way that native DLLs in Windows ‘work’.
–jeroen
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Posted by jpluimers on 2019/07/18
Interesting, need to try this one day to see how well this works so the base constructor TObject.Create cannot be called.[WayBack] delphi – How to hide the inherited TObject constructor while the class has overloaded ones? – Stack Overflow
–jeroen
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The Wiert Corner - irregular stream of stuff 