web

September 30, 2011

Author: Jim T1392 TBindList can iterate throughthe records in a TClientDataSet and fill a TListBox. Here is how toconfigure TBindListin the designer. Drop a TClientDataSet and a TDataSource on a form. Load some data into the dataset such as biolife.xml (Right click ClientDataSet1, choose “Load from MyBase table…”, browse to thesample data…

New "TOSVersion" type in Delphi XE2

August 31, 2011

Author: Tóth Erik Delphi XE2 is probably the most significant release since Delphi 1. The number of new features is amazing and probably the biggest, most important one is FireMonkey – a brand new business application development platform that let you use Delphi…

Delphi JSON Viewer

October 1, 2010

Author: Michael K22532 JSON support has been introduced in Delphi 2010 as a part of DBExpress database driver architecture, but of course JSON support is not limited to just database applications. JSON is similar to XML as both are text-based data interchange formats. Delphi…

Troubleshooting Entity Framework Connection Strings

August 13, 2010

Author: Craig Stuntz In an application which uses the Entity Framework, you may see the following error at runtime: MetadataException: Unable to load the specified metadata resource The cause of this error is a missing or malformed Entity Framework connection string. In particular, the cause of this error is the metadata parameter of the connection string. Let’s examine this more…

Using Windows Stock Icons in Delphi

May 31, 2010

Author: Pawe Gowacki it is not a big discovery that all applications are running in the environment provided by the underlying operating system. Delphi is well-known for its rapid application development capabilities. The latest version of Delphi – Delphi 2010 &#8211…

Converting to grayscale with TBitmap.ScanLine property

April 15, 2010

Author: Pawe Gowacki In my previous post “Boian’s TBitmap Visualizer and converting to grayscale” I have described an algorithm for converting arbitrary TBitmap instances to gray using a selected formula. The problem is with the performance of the code that…

What is Homomorphic Encryption And Why Should I Care? (Updated)

March 18, 2010

Updated: 28 November, 2021 Author: Craig Stuntz What Is Homomorphic Encryption? “Homomorphic” is an adjective which describes a property of an encryption scheme. That property, in simple terms, is the ability to perform computations on the ciphertext without decrypting it first. Because this tends to sound either baffling or miraculous the first time you hear it, let’s begin…

Entity Framework Models and Source Control

February 3, 2010

Author: Craig Stuntz As you’re probably aware, an Entity Framework model is stored in a single XML file, with the extension EDMX. Developers occasionally ask if this means that two people cannot work on the entity model concurrently. My answer to this is, “It…

join in LINQ to SQL and LINQ to Entities Considered Messy, Redundant

January 13, 2010

Author: Alf Christophersen In this post I will demonstrate that use of the join keyword in LINQ to SQL and LINQ to Entities is nearly always wrong. LINQ queries which you write with the join keyword are harder to read and write than queries you write using associations, and…

Delphi 2010 DirectWrite "Hello World" Example