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Technology: in Delphi XE2:: Delphi X2 has Vcl.Shell.ShellCtrls.pas but the Shell Controls package is not installed by default. There's ShellCtrls.pas and the packages to install in the samples folder (as before) - use it to manually install the Shell Control Property and Component Editors package. Trick question: when you use any of the TSHellTreeView or TShellListView what compiled (DCU) version of shellctrl...

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Technology: in Advanced Dephi:: Service applications take requests from client applications process those requests and return information to the client applications. They typically run in the background without much user input. Services can be automatically started when the computer boots can be paused and restarted and do not show any user interface. Read the full article to learn about Creating Windows Serv...

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Technology: in Delphi Tools / Components:: Working with database data in Delphi can be really simple. Drop a TQuery on a form set the SQL property set Active and voila here's your database data in a DBGrid. Ok you do need a TDataSource and a connection to a database but that's just a few clicks away. Now you want to insert update and delete data. That's also easy but can get messy. You fight with the corect...

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Technology: in Delphi Tips::Mouse wheel is used for scrolling. When a scrollable control (TMemo TListView TTreeView...) has the input focus moving the wheel will result in vertical scrolling of the content of the focused control. Many Windows applications (Delphi IDE including) have changed the default mouse wheel behaviour for input controls: when the wheel is spun the control beneath the mouse is scrolled -...

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Technology: in MDI Tips and Tricks:: MDI as a preferred user interface for applications that allow multiple documents to be contained within a single window is being abandoned by Microsoft during the last few years. Microsoft started to promote a different user interface for such applications - TDI: Tabbed User Interface. How about simulating a TDI for your MDI? Read the full article to learn how to Use Tabs...

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Technology: in Threading in Delphi:: The problem I had to solve is how to make file processing as fast as possible. Having a bunch of files (from 500 to 2000+) I have to process them (let's call this scanning ). The sequential approach (one after another) proven to be too slow. Machines have more cores today and the idea to have this file scanning running in multiple threads is something that must speed up th...

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Technology: in Coding Delphi Applications:: If you are preparing to move / migrate your old Delphi applications to any Delphi version later than Delphi 2009 you must have heard that a default Delphi string type is now (where now means in Delphi versions >= 2009) Unicode. What does this mean? Will you have trouble migrating your ansi applications? How to create new Unicode Delphi application? What has changed...

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Technology: in TListView Tips and Tricks:: When the Checkboxes property is True ListView includes a check box next to the items in the list. To get the checked state for an item in the list view read the Checked boolean property. You will notice that checking or unchecking the item in a list view will not change the selected item - the item that gets checked will not get selected. Read the full article to lea...

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Technology: in Threading in Delphi:: This is my next test project to see what threading library for Delphi would suite me best for my file scanning task I would like to process in multiple threads / in a thread pool. While exploring more ways to have some of my functions executed in a threaded manner I've decided to also try the AsyncCalls.pas unit developed by Andreas Hausladen. Andy's AsyncCalls - Asynchron...

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Technology: in Delphi Threading:: Just a few days after I wrote the AsyncCalls Unit By Andreas Hausladen - Let's Use (and Extend) It! article Andreas did release a new 2.99 version of AsyncCalls. The IAsyncCall interface now includes three more methods: The CancelInvocation method stopps the AsyncCall from being invoked. If the AsyncCall is already processed a call to CancelInvocation has no effect and the Ca...