Tag: delphi

How To: Creating a custom Variant type

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In this post I will detail on how to create a custom Variant for your data type. First of all, the help should be pretty useful in this case, but it if doesn’t help much, there is always…

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[Rant] Actions …

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Just a few words out of frustration: Do yourselves a favor and stay away from actions and ribbons in Delphi. At least for a while. If you really need fancy looking menus use JEDI. P.S. This would be…

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Avoid using TDictionary

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There are serious flaws in TDictionary in Delphi 2009. Try to avoid using it until a fixed version comes out. You can find a list of them in QC, but just to name two: TDictionary.Clear() is flawed. If…

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Version 0.2.1 of HelperLib

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Just released the “fix” version for HelperLib: 0.2.1. Major highlights: Improved the performance for IntToStr functions for “big numbers”. (From 25 minutes to 17 seconds for a 256^10000 number). A BCD-izer algorithm was used to create a BCD…

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HelperLib 0.2 released!

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I have finally released the version 0.2 of the HelperLib library. If you’ are interested in using generics in your Delphi 2009 applications, you might actually be interested in taking a look at the library. What can you…

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Forcing RTTI on record types

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While developing the “Type Support” module for the generics library I’m working on I’ve encountered a little problem – the compiler will not emit RTTI information for the records. Actually that isn’t entirely true – RTTI will be…

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Pointer to String casts

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This post describes how to avoid a recent mistake I’ve seen in a Delphi application related to “Pointer to String” casting. Consider the following example: In this example an untyped pointer was allocated with 128 bytes of memory,…

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Delphi Prism: DelphiString

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Was just reading the source code for ShineOn (the RTL implementation in Delphi Prism) and found an interesting piece: DelphiString (in /ShineOn.RTL/DelphiString.pas). What is it? It is a class that tries to replicate the behavior of the Win32…

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Delphi and the Integer data types

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There’s a lot of discussions on CodeGear newsgroups lately regarding the Integer data types and 64 bit support. Just wanted to clarify some points for people waiting for the 64 bit release of RAD Studio (due somewhere in…

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Delphi Generics: constructor restriction

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As promised in the previous post “Delphi: Default parameterless constructor” I will now try to create a new generic class that accepts a type parameter that has a “constructor” restriction (must have a default public parameterless constructor). Let’s…

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