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Delphi

Converting to grayscale with TBitmap.ScanLine property

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 actually changes the color of each pixel. Accessing color information is done via TBitmap.Pixels property, which is a…
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Delphi

A case when FreeAndNil is your enemy

Author: Allen It seems that my previous post about FreeAndNil sparked a little controversy. Some of you jumped right on board and flat agreed with my assertion. Others took a very defensive approach. Still others, kept an “arms-length” view. Actually, the whole discussion in the comments was very enjoyable to read. There were some very excellent cases on both sides. Whether or not you…
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News

jqGrid and XSS Security

Author: Craig Stuntz Version 3.5.2 of jqGrid included an important new feature: Now when autoencode is set to true we encode the data coming from server and not only when we post it (secutity fix) Prior to this, you were required to encode the data yourself. Now personally…
News

Entity Framework Models and Source Control

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…
News

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

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 they require knowledge of database metadata which is not required otherwise. This introduces the potential for errors and…
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Delphi

Delphi 2010 DirectWrite "Hello World" Example

Author: Sinisa P29531 In my previous post I have translated Windows 7 SDK Direct2D “Advanced Geometries” examplefrom C++ to Delphi 2010 code. That was a lot of fun, so I have decided to continue the adventure in the realm of Direct2D programming and this…
C++

Code Navigation In The RAD Studio Code Editor

Author: Darren Kosinski V1400 During the recent field test for RAD Studio 2010, I had a discussion with some field testers about the different mechanisms that the IDE provides for navigating through your source code. In particular, they were wondering why sometimes one…
News

JSON Types for Server Methods in DataSnap 2010

Author: Adrian Z1428 converter_1946 I am very happy I was granted permission to talk about the new features present in Delphi 2010 concerning database area. DataSnap 2010 (DS2010) extended the list of server method parameter types with the full suite of JSON types. It is now possible to pass a TJSONObject instance for example from a client process to a server as input or output parameter and…
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