Object-oriented programming in 4D: Manage class inheritance
In a previous blog post, we introduced a very important concept in object-oriented programming: Classes. Now we'll go through another core concept: In...
May 6, 2020
1 min read
4D Language
Design application logic with strong typing, object oriented principles, structured error handling, and modular class architecture. Write clear, maintainable code that works consistently across desktop, web, REST, and client server environments.
An intro to object-oriented programming in 4D: Classes
Many of you have have been asking to be able to define an object type ever since the Object type became available. Thanks to object notation, many of ...
May 4, 2020
1 min read
Who did what: Store user aliases in the journal
By now, you've surely discovered the new ability to identify your users thanks to the SET USER ALIAS command. In 4D v18 R2, the command's behavior has...
February 25, 2020
1 min read
Ease your developer’s life with list boxes
Our main objective is to make developers' lives easier, day after day, and list boxes are one 4D's most used and powerful form objects that serve this...
January 31, 2020
1 min read
Take control of your work area
Want to adapt your application's interface to your end user's system preferences? Want to make sure your application's interface isn't obscured by the...
January 29, 2020
1 min read
Formula – Think outside the box
According to the top 10 blog posts of 2019, the Formula: More power behind simplicity post ranked quite high ... in the top five. It seems that Formul...
January 9, 2020
1 min read
Code Editor: Say hello to Comment blocks
Adding a block of comments at the beginning of a method is useful for adding a note about what a method does, as well as a list of input/output parame...
December 4, 2019
1 min read
Coexistence of thread-safe and non-thread-safe commands
Have you ever needed to use methods with both thread-safe and not thread-safe calls, with conditions that skip over commands that are not thread-safe?...
November 27, 2019
1 min read
Zip/unzip files and folders with these commands
Before exchanging files (by email for example), we often compress them to reduce their size before transmitting them. With 4D v18, you can compress an...
November 21, 2019
1 min read
New 4D View Pro form events
As of 4D v18, a new set of 4D View Pro form events are available. They return special information that can be accessed with the new FORM Event command...
November 19, 2019
1 min read