Story Category: Software Development

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Delphi revelations #3 – kbmMW Smart client – DispInvoke leak – Components4Developers

jpluimers jpluimers For my archive, as one day I will run into this Variant/DispInvoke issue myself:[WayBack] Delphi revelations #3 – kbmMW Smart client – DispInvoke leak – Components4Developers: Delphi revelations, now about investigating a pesky DispInvoke bug… … Read more 4 years ago in Delphi, Development, Software Development 0

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Delphi: why breakpoints from time to time are not usable (green highlighted line on IDE)? – Stack Overflow

jpluimers jpluimers I still have not figured out the circumstances, but ever since either the Unicode Delphi versions (2009 and up) or BDS (8 and up), I have this every now and then: [WayBack] Delphi: why breakpoints… … Read more 4 years ago in Delphi, Development, Software Development 0

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A bunch of Spring4D dependency injection container related questions

jpluimers jpluimers Since G+ is down, a lot of interesting questions have vanished. Luckily I saved some by [WayBack] Jacek Laskowski – Google+ related to Spring4D and dependency injection: [WayBack] Spring4D IoC and specific singleton… – Jacek Laskowski –… … Read more 4 years ago in Conference Topics, Conferences, Delphi, Development, Event, Software Development 0

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Do not make methods protected unless you want them to be visible as public

jpluimers jpluimers One of the protection levels in Delphi is protected. Originally meant for the class itself, that level is also visible to “friends”: anything in the same unit, for example: unit BusinessLogicUnit; interface type TBusinessLogic =… … Read more 4 years ago in Conference Topics, Conferences, Delphi, Development, Event, Software Development 0

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Delphi: `procedure RaiseAbstractError(const aClass: TClass; const aMethodName: string);`

jpluimers jpluimers Needs the System.SysConst unit: procedure RaiseAbstractError(const aClass: TClass; const aMethodName: string); begin   // more explanatory than AbstractErrorProc();   raise EAbstractError.CreateFmt(‘%s: method %s.%s’, [SAbstractError, aClass.ClassName… … Read more 4 years ago in Delphi, Development, Software Development 0

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delphi – What are the list of all possible values for DVCLAL? – Stack Overflow

jpluimers jpluimers From a while ago, from notes even longer ago – around 1994 on DVCLAL the Delphi VCL Access License code which is actually a checking logic for determining the SKU (stock keeping unit) or Delphi… … Read more 4 years ago in Conference Topics, Conferences, Delphi, Development, Event, History, Software Development 0

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Tracking down Delphi “abstract error” occassions.

jpluimers jpluimers A few tips. Set breakpoints in these units: System.pas: procedure _AbstractError; begin if Assigned(AbstractErrorProc) then AbstractErrorProc; RunErrorAt(210, ReturnAddress); end; System.SysUtils.pas: procedure AbstractErrorHandler; begin raise EAbstractError.CreateRes(@SAbstractError); end; add a watch for ClassName that has “Allow side… … Read more 4 years ago in Conference Topics, Conferences, Delphi, Development, Event, Software Development 0

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Be careful changing the DataContext of a TRemotable

jpluimers jpluimers Still not sure why the RTL code is like this: procedure TRemotable.SetDataContext(Value: TDataContext); begin if (RemotableDataContext <> nil) and (RemotableDataContext = Self.DataContext) then begin TDataContext(RemotableDataContext).RemoveObjectToDestroy(Self); end; FDataContext := Value; end; It means that if you… … Read more 4 years ago in Conference Topics, Conferences, Delphi, Development, Event, Software Development 0

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Pointers are dangerous – twm’s blog

jpluimers jpluimers TL;DR Do not keep pointers to objects in memory that can be relocated. SetLength can relocate the memory [WayBack] Pointers are dangerous – twm’s blog Via: [WayBack] Pointers can be really helpful, especially they can improve… … Read more 4 years ago in Conference Topics, Conferences, Delphi, Development, Event, Software Development 0

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Since Delphi still does not include a TDateTimeHelper: use the one by colini which has tests

jpluimers jpluimers These are quite OK: [WayBack] GitHub – colinj/TDateTimeHelper: Helper record for TDateTime type in [WayBack] DateTimeHelper.pas with DUnitX tests in [WayBack] TDateTimeHelper.Tests.pas. Via: [WayBack] Does Delphi XE 10.2.2 ship with type helpers … … Read more 4 years ago in Delphi, Development, Software Development 0

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Learned about the {$EXTENSION zzz} or {$E zzz} Delphi directive: {$EXTENSION yyy.zzz} fails

jpluimers jpluimers I totally missed that this has been added in Delphi a long time ago (at least in Delphi 2007 or maybe even before): the {$EXTENSION zzz} or {$E zzz} Delphi directive that sets the file extension… … Read more 4 years ago in Conference Topics, Conferences, Delphi, Development, Event, Software Development 0

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FastMM PushAllocationGroup

jpluimers jpluimers Few people seem to know about the FastMM PushAllocationGroup method. This search returned almost nothing: fastmm PushAllocationGroup -site:github.com -site:sourceforge.net -site:stackoverflow.com – Google Search. These results were convoluted: fastmm PushAllocationGroup site:sourceforge.net – Google Search fastmm PushAllocationGroup site:stackoverflow.com – Google… … Read more 4 years ago in Conference Topics, Conferences, Delphi, Development, Event, FastMM, Software Development 0

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Spring4D Mock – Delphi Unit Testing : Writing a simple spy for the CUT – Stack Overflow

jpluimers jpluimers Reminder to self: write a longer article on Delphi mocking as Spring4D mocking is much better than Delphi Mocks, especially because of code-completion reasons. Spring4D has a Mock record that can return a Mock<T> on… … Read more 4 years ago in Conference Topics, Conferences, Delphi, Development, Event, Software Development, Spring4D 0