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Decipher the delphivcl.Application

delphivcl.Application is the type used for a GUI windowed application. Application encapsulates a windowed application. The methods and properties introduced in the Application reflect the fundamentals established in the Windows operating system to create, run, sustain, and destroy an application.

Application thereby simplifies the interface between the developer and the Windows environment. For this purpose, the Application encapsulates behavior for:

  • Windows message processing
  • Context-sensitive online help
  • Menu accelerator and key processing
  • Exception handling
  • Managing the fundamental parts defined by the Windows operating system for an application, such as MainWindow, WindowClass, and so on

Each GUI application automatically declares an Application variable as the instance of the application. If the application is not a Web server application, control panel applet, or NT service application, this variable is of type Application.

Application does not appear on the Component palette, nor is it available in the form designer to visually manipulate; so it has no published properties. 

We can browse all the properties, methods, and built-in properties of the delphivcl.Application in Python using dir() command:

See the responses in command prompt:

output01 3755516

See them more clearly here:

Let’s create a Python main function that can run and close an application window:

Note for beta release users

In practice, the only difference between DelphiVCL for Python release version and the beta version is only in how you write the DelphiVCL. Here is the example for how you import the library:

  • Release version:
  • Beta version:

Watch this comprehensive introduction to Python GUI Development with DelphiVCL library video by Jim McKeeth:

Also, watch the following webinar by Alexey Sharagin to Master the Secrets of Beautiful Modern Windows Apps:


Check out DelphiVCL which easily allows you to build GUIs for Windows using Python.

Check out Python4Delphi which easily allows you to build Python GUIs for Windows using Delphi.


References & further readings

[1] Embarcadero DocWiki. (2011). 

Vcl.Forms.TApplication. Embarcadero DocWiki. Embarcadero Technologies. docwiki.embarcadero.com/Libraries/Sydney/en/Vcl. Forms.TForm

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