Delphi Tips: How To Create And Call A Dynamic Link Library (DLL)

Introduction To The Dynamic Link Library (DLL)

A Dynamic Link Library (DLL) is an executable file with a .DLL extension that may contain procedures, functions or resources that can be shared by multiple programs. Even if several programs call the same DLL, it is only loaded once in memory saving system resources. That is one of its major advantages.

A DLL can be used to store resources. For example, you can create a DLL of images that you can then use in your applications. Or, you can use DLLs to provide multi-lingual support for an application by creating several versions of a DLL for the various supported languages and then calling them as needed at run time.

You may have a complex application that is constantly being updated. By using DLLs in this situation, you can save your users a great deal of time and frustration. Instead of having to recompile and deploy the entire application with every new update, you can simply provide a new DLL to replace an older version. To use a DLL in this way, you must include all the methods found in the old DLL in the new version, and not change any of the original parameters.

Online Delphi Training offers customized DLL training. You can also sign up for the following classes:

• ALC26 - DLLs with Delphi - Introduction and Examples (3-hour introductory class)
• DL202 - Delphi Programming Concepts IV (8-hour class)

This example will show you how to create and call a DLL in Delphi. To see the full explanation and code, click on:

How To Create And Call A Dynamic Link Library (DLL) in Delphi.

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Delphi Tips: How To Use Constraints To Validate Data

One of the many things that I love about Delphi is the fact that it is a RAD (Rapid Application Development) environment. So much is prebuilt in its IDE that very little code is required to achieve certain functionalities that would require extensive coding in other languages.

Delphi is extremely powerful and versatile, especially when it comes to creating database applications. It comes ready with many components that facilitate and speed up database development.

One important aspect of database development is the validation of data. The data is validated to match the database before any data is sent to the server for posting. This ensures the compatibility of data, and reduces network traffic.

Without validation, invalid data could be sent to the server which would then reject the data and send it back to the client with a database error. When you use data validation, data entry inconsistencies or errors are trapped on the client side long before they get to the server.

This example will show you how to create data constraints in Delphi for validating data entry. To see the full explanation and code, click on:

Using Constraints To Validate Data In Delphi

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Delphi Tips: How To Save The Position & Size Of A Form Based On A User's Preference

I sometimes get asked the question: How do you save the position and size of a given window based on a user's preference, and then use the saved settings next time you open the window?

The solution to this problem is quite simple. First, you must decide how to save the settings. The three most common ways are:

1. Use an INI File - Typically one user per computer
2. Use the Windows Registry - Can be for a single user, or for multiple users with different accounts sharing the same computer
3. Use a database table - Client/Server environmnet where one user can use any networked computer

I will only cover the first method - the use of an INI file to save the settings. The concept is the same for all three:

When the window is opened, check to see if you should load any saved settings and if they had been saved. If so, use the settings to display the window. Otherwise, load the default window settings (design settings). Before closing the window, check to see if you should save any settings. If so, save the settings and exit.

To see the full explanation and code, click on:

How To Save A Window's Size & Position In Delphi

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Delphi Training Schedule.

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Recommended Delphi Books.

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Krikor Mnatzaganian
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Email: info@onlinedelphitraining.com

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Email: info@onlinedelphitraining.com

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