Story Category: Conferences

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Delphi object instance lifetime demo; do not use AfterConstruction as a poor-mans way to work around non-virtual constructor or undetermined Create hierarchy calls

jpluimers jpluimers I think using AfterConstruction is a poor man’s solution that you should only use in exceptional cases, as it is: called only after the last constructor in the chain is called. called outside of the… … Read more 4 years ago in Conference Topics, Conferences, Delphi, Development, Event, Software Development, Undocumented Delphi 0

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delphi – Invalid floating point operation calling Trunc() – Stack Overflow

jpluimers jpluimers I bumped into [WayBack] delphi – Invalid floating point operation calling Trunc() – Stack Overflow, while searching for what might have tests like these fail: TValueRecordTests.Int64_Through_Value_Container_via_Currency_Intermediate_Is_Identity_Operation(9223372036854775807) = 9223372036854775807 EInvalidOp with message ‘Invalid floating point operation’… … Read more 4 years ago in Conference Topics, Conferences, Delphi, Development, Event, Software Development 0

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A DUnit Folder Iterator Extension – The Art of Delphi Programming

jpluimers jpluimers Reminder to self: experiment with [WayBack] A DUnit Folder Iterator Extension – The Art of Delphi Programming. This could be extended to virtual folders, allowing many integration tests to be run depending on some configuration… … Read more 4 years ago in Conference Topics, Conferences, Delphi, Development, DUnit, Event, Software Development, Unit Testing 0

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Short Delphi tip: ensuring RTTI for classes is included

jpluimers jpluimers When using RTTI in Delphi, you really want the RTTI to be available. The compiler includes RTTI for classes, as soon as it found that a class is touched by code that will be executed…. … Read more 4 years ago in Conference Topics, Conferences, Delphi, Development, Event, Software Development, Undocumented Delphi 0

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Delphi: quickly failing in use-after free scenarios

jpluimers jpluimers Two tricks that can help in use-after-free scenarios. Call ScanMemoryPoolForCorruptions often One of the scenarios of use after free, is that memory blocks get corrupted. FastMM4 normall checks this at process end using the CheckBlocksOnShutdown… … Read more 4 years ago in Conference Topics, Conferences, Delphi, Development, Event, FastMM, Software Development, Undocumented Delphi 0

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Delphi: not all lists need to be generic

jpluimers jpluimers Lots of Delphi programmers made, or are making the move, of classic Delphi based containers like TObjectList into generic containers like TList<T>. A while ago, I got into a project that needed to extend lifetime… … Read more 4 years ago in Conference Topics, Conferences, Delphi, Development, Event, Software Development 0

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DUnit testing code that should raise a specific exception

jpluimers jpluimers A while back, I was writing some code to demonstrate a few inner workings of TInterfacedObject, interface reference counting and mixing object references with interface references. One way to show this is through a test… … Read more 4 years ago in agile, Conference Topics, Conferences, Delphi, Development, Event, Software Development, Unit Testing 0

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If you use an implementation of TNonRefCountInterfacedObject, then document in the descendants how lifetime management is arranged for

jpluimers jpluimers There are a few TNonRefCountInterfacedObject (or maybe better named TNonReferenceCountedInterfacedObject) implementations around (see list of links below). They can be used to expose interfaces, but do not provide interface reference counting. This means you have… … Read more 4 years ago in Conference Topics, Conferences, Delphi, Development, Event, Software Development 0

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Want to use SmartPointers in Delphi? Use the Spring4D one: it is unit tested and optimised

jpluimers jpluimers A while ago, there was a nice discussion on smart pointers at [WayBack] Smart Pointers – Generics vrs non-generic implementastion – RTL and Delphi Object Pascal – Delphi-PRAXiS [en]. Conclusion from that: many people think that… … Read more 4 years ago in Conference Topics, Conferences, Delphi, Development, Event, Software Development, Spring4D 0

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Delphi processing all Windows messages

jpluimers jpluimers Since I had captures messages inside the main message loop, I forgot it is straightforward: create a [WayBack] TApplicationEvents instance, then use the [WayBack] OnMessage event and hook it to a method like procedure TMainForm.ApplicationEventsMessage(var Msg: TMsg; var… … Read more 4 years ago in Conference Topics, Conferences, Delphi, Development, Event, Software Development 0

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How to debug Delphi JSON export stack-overflows: watch the fields and their circular references

jpluimers jpluimers Unlike Delphi RTL XML support which is property based, the JSON support is field based. By default, JSON uses all fields (no matter their protection level, so anything from strict private to published  is taken into… … Read more 4 years ago in Conference Topics, Conferences, Delphi, Development, Event, Software Development 0

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In Delphi, avoid having a TComponent descendant implement interfaces, unless you are prepared to handle your refcounting

jpluimers jpluimers Every now and then I see code, where a class descending from TComponent implements some interfaces, only interface references are used to the instances, and the expected behaviour is that the instances will free themselves when… … Read more 4 years ago in Conference Topics, Conferences, Delphi, Development, Event, 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