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 ‘Undocumented Delphi’ Category

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Where can I find a comprehensive list of Delphi “compiler magic” declarations? – Stack Overflow

Posted by jpluimers on 2022/11/16

A long time ago, I posted one of the answers to [Wayback/Archive] Where can I find a comprehensive list of Delphi “compiler magic” declarations? – Stack Overflow

So for my link archive, these are the main ways of assembling an (always incomplete, as only partially documented) list:

–jeroen

Posted in Conference Topics, Conferences, Delphi, Development, EKON, Event, Software Development, Undocumented Delphi | Leave a Comment »

On TStrings (and TStringList) sorting: what the default Sort behaviour is and how to change sorting order

Posted by jpluimers on 2021/12/07

Because I need this eventually, here the full quote of my answer in [Wayback] sorting – How can I get TStringList to sort differently in Delphi – Stack Overflow (The default Sort behaviour is to accommodate i18n sorting in natural order):

Read the rest of this entry »

Posted in Conference Topics, Conferences, Delphi, Development, Event, Software Development, Undocumented Delphi | Leave a Comment »

Parser generator toolset for Delphi (Yacc & Lex)

Posted by jpluimers on 2021/08/03

The most current Lex and Yacc for Delphi is [WayBack] GitHub – RomanYankovsky/ndyacclex: Parser generator toolset for Delphi (Yacc & Lex).

It came up during a funny Twitter thread, where one of the Delphi team members asked for it, despite – after decades of asking – there still being no official Delphi grammar available from the Delphi team, nor Google Search skills [WayBack].

Basically a parser generator is only as useful as the grammar you have for it.

There is no open source grammar for Delphi yet, so the best you can start with is from the same author: [WayBack] GitHub – RomanYankovsky/DelphiAST: Abstract syntax tree builder for Delphi

With DelphiAST you can take real Delphi code and get an abstract syntax tree. One unit at time and without a symbol table though.

Relevant tweets:

–jeroen

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

file – String format procedure similar to writeln – Stack Overflow

Posted by jpluimers on 2021/05/11

Cool Format feature from [WayBack] file – String format procedure similar to writeln – Stack Overflow:

The cool thing about using Format is that you use for Format Strings not only to parameterize things like width and precision inside that Format String, but also as parameters like you normally would provide values.

You can get very close to using a width of 8 and a precision of 2, like the example in your question.

For instance, to quote the documentation:

Format ('%*.*f', [8, 2, 123.456]);

is equivalent to:

Format ('%8.2f', [123.456]);

That is a much overlooked feature of Format and Format Strings.

--jeroen

Posted in Conference Topics, Conferences, Delphi, Development, Event, Software Development, Undocumented Delphi | Leave a Comment »

Delphi: got “EOleException with message ‘Microsoft MSXML is not installed'” in a console or test project?

Posted by jpluimers on 2021/03/31

Did you ever get this run-time error in a console or test project?

EOleException with message 'Microsoft MSXML is not installed'

It means that CoInitialize or CoInitializeEx needs to be called in the thread that uses MSXML.

Then an easy workaround is to:

  1. use the unit System.Win.ComObj in any unit that (indirectly) uses Xml.XMLDoc (for instance any unit using an XML Data Binding generated unit),
  2. use the unit System.SysUtils as well (because it defines TProcedure used below)
  3. add this code in in your initialization section (which is what VCL TApplication.Initialize does):

if InitProc <> nil then TProcedure(InitProc); // Calls CoInitialize for the main thread and prevents "EOleException with message 'Microsoft MSXML is not installed'"

The initialization section of System.Win.ComObj sets up InitProc to cals CoInitialize for the main thread, which usually suffices for these simple VCL projects, but not for most console or test projects.

Based on ideas I got after reading [WayBack] 为什么LoadXMLDocument在线程类中使用会报错？-CSDN论坛 (for which Google Translate actually does a goot job [Archive.is])

–jeroen

Posted in Conference Topics, Conferences, Delphi, Development, Event, Software Development, Undocumented Delphi | Leave a Comment »

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