Use COM Object from DLL without register

Question

Is it possible to use COM Object from DLL without register in C++ not managed code?

Answer 1

Say, the COM DLL needs to be registered, but the application doesn't have admin access rights. Here is an easy hack to register the DLL under HKEY_CURRENT_USER, which doesn't require admin rights:

1. Use LoadLibrary to load the COM DLL.
2. Call GetGetProcAddress to get the address of DllRegisterServer.
3. Call RegOverridePredefKey to make the temporary registry redirects: HKEY_LOCAL_MACHINE to HKEY_CURRENT_USER and HKEY_CLASSES_ROOT to HKEY_CURRENT_USER\Software\Classes.
4. Call DllRegisterServer obtained in step 2.
5. Reverse the registry redirects.
6. Use the COM server as usual, it's now registered under HKEY_CURRENT_USER.