AtlDllRegisterServer

AtlDllRegisterServer is a function provided by the Active Template Library (ATL) in Microsoft's Visual C++. It is used to register a DLL as a COM (Component Object Model) server. This function is typically called during the installation of a COM component to ensure that the system is aware of the DLL and can create instances of the COM objects it contains.

The AtlDllRegisterServer function performs the following tasks:

1. It registers the DLL's CLSID (Class Identifier) and ProgID (Programmatic Identifier) with the system registry. This allows other applications to create instances of the COM objects provided by the DLL.

2. It registers the DLL's type library, if one is provided. This makes the interfaces and classes defined in the DLL available to clients that use type libraries.

3. It registers the DLL's threading model, which specifies how the DLL handles concurrency.

To use AtlDllRegisterServer, a developer must include the atlbase.h header file and link against the atl.lib library. The function is usually called from the DLL's DllRegisterServer function, which is invoked by the system when the DLL is registered using the regsvr32.exe utility or a similar tool.

It is important to note that AtlDllRegisterServer is a convenience function and is not required for all COM DLLs. Developers can choose to manually register their DLLs using the Windows API functions provided for this purpose. However, AtlDllRegisterServer simplifies the registration process and is commonly used in ATL-based projects.