Delphi Decipher the DelphiVCL.Application

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Decipher the DelphiVCL.Application
By Muhammad Azizul Hakim April 9, 2021

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:

import DelphiVCL

dir(DelphiVCL.Application)

See the responses in command prompt:

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

def main():
    Application.Initialize()
    Application.Title = "MyDelphiApp"
    f = MainForm(Application)
    f.Show()
    FreeConsole()
    Application.Run()
    Application.Destroy()
 
main()

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