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

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Archive for September 25th, 2015

A while ago Allen Bauer commented on the working theory of Nullable in Delphi

Posted by jpluimers on 2015/09/25

I missed this last May, but revisiting some old G+ posts I saw Allen Bauer commenting:

Current working theory of Nullable<T>.

Nullable<T> = record
property Value: T read FValue; default;

Using the default directive to “hoist” the operators of “T”. Currently the default directive only works for array properties by “hoisting” the ‘[]’ operator. Marking a non-array property with default will make the containing type behave as that type.

This, coupled with some intrinsic compiler knowledge of the Nullable<T> type will make Nullable<T> work without any addition of keywords or other standard functions or procedures.

Using the “default” directive on a non-array property will work for any type, except for having the null-propagation semantics.

When considering language features, I try and not only make it work for the intended purpose, but also broaden reach of any supporting feature. In the above scenario, even user-defined operators on “T” will be properly hoisted and used.

So hopefully, one day there will me more than Nullable<T> in Spring.pas which has been around for quite a while now..


Source: Delphi’s New Feature Desired: Nullable Types and Null Propagation Nullable…

Posted in Delphi, Development, Software Development | 5 Comments »

Does anyone have a proper solution for message “content preparation progress” when opening a PDF file?

Posted by jpluimers on 2015/09/25

It drives me nuts as the below “content preparation progress” solution fails for me on a Windows 8 system having Adobe Reader XI.

Anyone that has a proper solution?


  1. Go to Edit > Preferences > Reading.
  2. Under “Screen Reader Options” select “Only read the currently visible pages”.


Source: Message “content preparation progress” when opening a PDF file

Posted in Adobe, Adobe Reader, Power User | 1 Comment »

windows – Find out whether an environment variable contains a substring – Stack Overflow

Posted by jpluimers on 2015/09/25

Very smart case insensitive way answered by jeb:

if NOT "%foo%"=="%foo:bar=%" echo FOUND


via windows – Find out whether an environment variable contains a substring – Stack Overflow.

Posted in Batch-Files, Console (command prompt window), Development, Power User, Scripting, Software Development, Windows | Leave a Comment »

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