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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for August, 2018

How to read data from old delphi application Paradox databases without BDE?

Posted by jpluimers on 2018/08/30

Interesting question that raise some good tips: [WayBack] How to read data from old delphi application Paradox databases without BDE? I search for freeware or open source solution. – Jacek Laskowski – Google+

–jeroen

Posted in Database Development, Delphi, Development, Paradox, Software Development | Leave a Comment »

Handling a new era in the Japanese calendar in .NET | .NET Blog

Posted by jpluimers on 2018/08/30

A first-hand look from the .NET engineering teams: [WayBack] Handling a new era in the Japanese calendar in .NET | .NET Blog

Very important if your software has to do anything with Japan, which – for global software and web applications – can be a lot.

Via: [WayBack] If you thought Y2K, leap years, easter and lent were complex, take a look at the Japanese era challenge… – Lars Fosdal – Google+

–jeroen

Posted in .NET, Development, Software Development | Leave a Comment »

DUnitX: now has a WillRaiseAttribute to ease defining tests around code that should throw exceptions

Posted by jpluimers on 2018/08/29

I stumbled over this commit message in [WayBack] “extended the TestAttribute with “Expected” property (#181)” which isn’t phrased correctly, but adds a very nice feature.

The feature is about WillRaiseAttribute:

constructor WillRaiseAttribute.Create(AExpectedException: ExceptClass; const AInheritance: TExceptionInheritance);

This allows tests like these:

    [WillRaise(EOutOfMemory)]
    procedure FailMe;

    [WillRaise(EHeapException, exDescendant)]
    procedure FailMeToo;

    [WillRaise(Exception, exDescendant)]
    procedure FailAny;

    [WillRaise(EOutOfMemory)]
    [Ignore('I am not behaving as I should')]
    procedure IgnoreMeCauseImWrong;

–jeroen

Posted in Delphi, Development, Software Development | Leave a Comment »

Enum values in their own namespaces/scopes: Scoped Enums (Delphi)

Posted by jpluimers on 2018/08/29

A while ago, I needed several enum types in the same unit with overlapping enumeration values.

Putting each in an encompassing type wasn’t possible and I didn’t want to put each in their own unit.

Luckily, Delphi 2009 introduced the “scoped enum” feature effectively promoting the enumeration type into a scope or namespace.

It is only available at the source code level, as – at least up until Delphi 10.1 Berlin – it is not part of the compiler settings in the project options (see screenshot below).

Since the below was hard to find combined with the word “namespace” I’ve quoted it in full (note an earlier version of the post had a typo here as it was copied from the Delphi 2009 documentation which had SCOPEDEUNMS wrong):

Type
Switch
Syntax
{$SCOPEDENUMS ON}, or {$SCOPEDENUMS OFF}
Default
{$SCOPEDENUMS OFF}
Scope
Local

Remarks

The $SCOPEDENUMS directive enables or disables the use of scoped enumerations in Delphi code. More specifically, $SCOPEDENUMS affects only definitions of new enumerations, and only controls the addition of the enumeration’s value symbols to the global scope.

In the {$SCOPEDENUMS ON} state, enumerations are scoped, and enum values are not added to the global scope. To specify a member of a scoped enum, you must include the type of the enum. For example:

type
  TFoo = (A, B, Foo);
  {$SCOPEDENUMS ON}
  TBar = (A, B, Bar);
  {$SCOPEDENUMS OFF}

begin
  WriteLn(Integer(Foo)); 
  WriteLn(Integer(A)); // TFoo.A
  WriteLn(Integer(TBar.B));
  WriteLn(Integer(TBar.Bar));
  WriteLn(Integer(Bar)); // Error
end;

Note that this is also valid:

 Writeln(Integer(TFoo.A));

Even though TFoo was not declared with $SCOPEDENUMS ON, the A value can still be explicitly resolved using the enumeration name.

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Posted in Delphi, Development, Software Development | 4 Comments »

.net – How to generate service reference with only physical wsdl file – Stack Overflow

Posted by jpluimers on 2018/08/28

Since I always forget that you can add a service reference by hand-pasting the full path to a local WSDL file, then hit Go: [WayBack] .net – How to generate service reference with only physical wsdl file – Stack Overflow

–jeroen

Read the rest of this entry »

Posted in .NET, Development, Software Development, Visual Studio 2015, Visual Studio and tools | Leave a Comment »

 
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