Common Registry entries for COM/COM+ classes
By submitting your personal information, you agree that TechTarget and its partners may contact you regarding relevant content, products and special offers.
COM clients do not register COM DLLs. You have to do it manually using a utility called regsvr32.exe or some Windows Setup.EXE program performs the registration behind the scenes. The following Registry settings from Gregory Brill's Applying COM+, New Riders, are the minimum entries a DLL enters.
Following is a list (which by no means is all-inclusive) of common Registry settings. Note that most are optional:
- Implemented Categories (Optional). Clients and utilities can look at this entry to determine what a given coclass is capable of and/or what its requirements are. Specifically, there are a number of GUID's established by Microsoft (check MSDN for details), each one of which indicates a specific capability or requirement. One or many of these GUIDS can be added as subkeys under this key.
- InprocServer32 (Required). Contains the path and DLL where the coclass being described can be found. Also has a data entry indicating the coclass's threading affinity.
- Programmable (Optional). Indicates that the object supports OLE automation.
- Typelib (Suggested but optional). Lists the GUID of its type library. This GUID can be looked up under the HKEY_CLASSES_ROOTTypeLib key, and the actual path to the type library can then be found.
- Version (Optional). Can be used to indicate a version of the coclass. This is only important if different versions of the same coclass co-exist, but all need to be available to the client.