Registering the Component
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Registration is a simple process that tells the IDE which components to add to its component library, and on which pages of the Tool Palette they should appear. For a more detailed discussion of the registration process, see Making components available at design time.
To register a component:
To register a component implemented in Delphi:
- Add a procedure named Register to the interface part of the component's unit. Register takes no parameters, so the declaration is very simple:
procedure Register;Note: Although Delphi is a case insensitive language, the Register procedure is case sensitive and must be spelled with an uppercase R.
- See more code details in Creating a Component with the Component Wizard.
- If you are adding a component to a unit that already contains components, it should already have a Register procedure declared, so you do not need to change the declaration.
- Write the Register procedure in the implementation part of the unit, calling RegisterComponents for each component you want to register. RegisterComponents is a procedure that takes two parameters: the name of a Tool Palette category and a set of component types:
procedure Register; begin Classes.RegisterComponents('MyComponents', [MyComponent]); end;If you are adding a component to an existing registration, you can either add the new component to the set in the existing statement, or add a new statement that calls RegisterComponents.
To register a component implemented in C++, add a procedure named Register to the component's unit:
namespace MyComponent
{
void __fastcall PACKAGE Register()
{
TComponentClass classes[1] = {__classid(TMyComponent)};
RegisterComponents("Samples", classes, 0);
}
}
See more code details in Creating a Component with the Component Wizard.
If you are adding a component to a unit that already contains components, it should already have a Register procedure declared, so you do not need to change the declaration.