In this post, you’ll learn how to use the FreeNotification method or DelphiVCL.Application.FreeNotification to ensure that AComponent is notified that the component is going to be destroyed.
Use FreeNotification to register AComponent as a component that should be notified when the component is about to be destroyed. It is only necessary to register components this way when they are in a…
In this post, you’ll learn more about the GetInterface method or DelphiVCL.Application.GetInterface is used to retrieve a specified interface. GetInterface retrieves the interface designated by a GUID or type name. The basic implementation of GetInterface uses the GUID…
In this post, you’ll learn how to use the GetInterfaceEntry method or DelphiVCL.Application.GetInterfaceEntry to return the entry for a specific interface implemented in a class. GetInterfaceEntry returns the class entry for the interface specified by the IID…
In this post, you’ll learn how to use the GetHashCode method or DelphiVCL.Application.GetHashCode is used to return an integer containing the hash code. By default, calling GetHashCode on an object returns an integer representing the virtual address at which the object is stored.
Notes:
GetHashCode is supposed to be overridden in user-derived classes, to provide consumer objects with…
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Despite the pandemic, PyCon 2020 was still celebrated successfully. Since large events…
This section lists all routines and classes included in Delphi’s VCL, split by categories. You can use these lists to navigate according to your needs.
VCL CategoryUnit(s)Additional ControlsVcl.ActnColorMaps, Vcl.ActnCtrls, Vcl.ActnMan, Vcl.ActnMenus, Vcl.ActnPopup…
We can use the CreateHandle method or DelphiVCL.Application.CreateHandle to generate a main window for the application if it does not already have one.
Do not call CreateHandle directly. In EXEs, the application’s constructor calls CreateHandle. In DLLs, it does not.
CreateHandle encapsulates much of what traditional Windows programs write in WinMain. For example, CreateHandle…
In this post, we’ll use the Create method of the DelphiVCL.Application object, & DelphiVCL.Application.Create, to create a new VCL-based application.Do not call Create directly. Each GUI application automatically creates an instance of an application object.
In this post, we’ll use the DialogHandle property or DelphiVCL.Application.DialogHandle provides a mechanism for using non-VCL dialog boxes in an application. Learning how to do it will allow you to easily build GUIs with Python Program Maker.
Use DialogHandle when…
In this post, we’ll use the FieldAddress method or DelphiVCL.Application.FieldAddress to return the address of a published object field. Learning how to do it will allow you to easily build GUIs with Python Coding Software.
FieldAddress is used internally by the component streaming system to access a specified published field of an object. FieldAddress returns a pointer to the field…
