com:ComInterface

Article
10/30/2023

Declares a package extension point of type windows.comInterface. The comInterface extension may include three types of registrations: Interface, ProxyStub, or TypeLib.

Element hierarchy

<com:Extension>

<com:ComInterface>

Syntax

<com:ComInterface>

  <!-- Child elements -->
  com:ProxyStub{0,1000},
  com:Interface{0,10000},
  com:TypeLib{0,1000}

</com:ComInterface>

Key

{} specific range of occurrences

Attributes and elements

Attributes

None.

Child elements

Child element	Description
com:ProxyStub	Registers a proxy stub.
com:Interface	Registers new COM Interfaces.
com:TypeLib	Registers a type library.

Parent elements

Parent element	Description
com:Extension	Provides functionality to expose COM registrations to clients outside of the app package.

Remarks

The comInterface extension can be under the Application/Extensions/Extension manifest element, or under the Package/Extensions/Extension manifest element. There is no functional difference between these two options, but both placements have different advantages.

If the extension is under Application/Extensions/Extension, you can improve the readability of the manifest by keeping interface registrations near the class registrations that implement them. However, if you place the extension under Package/Extensions/Extension, you won't need to determine which Application to use for each interface. It's possible to use multiple comInterface extensions in either Application/Extensions/Extension or Package/Extensions/Extension, but this is neither recommended nor necessary.

Note

Any registrations in comInterface that depend on another registration (e.g. an Interface references a ProxyStub and/or a TypeLib) must be in the same comInterface extension.

Requirements

Item	Value
Namespace	`http://schemas.microsoft.com/appx/manifest/com/windows10`
Minimum OS Version	Windows 10 version 1703 (Build 15063)