Visual studio .NET integrated windows installer : self registering of a dll (vsdrfCOMSelfReg)
Posted on 2003-11-26
In my application I use SQLDMO to have acces to the same possibilities as in the SQL Enterprise Manager (sqldmo.dll)
My application must run on PC's with already MSDE/SQL Server installed or PC's without MSDE/SQL Server installed (even no installed SQL Client software).
Microsoft has a knowledge paper with the steps to follow what to install for being able to run SQLDMO on a client machine without SQL client software.
You must install several dlls and one dll (sqldmo.dll) must be registered.
In a windows installer project (Visual Studio .NET) you can set the proporty REGISTER of this dll to vsdrfCOMSelfReg.
After running my installer my application was running on all machines (it worked :-) )
But there is a 'BUT' :
The installer is not detecting that the dll is already installed and registered on machines with SQL Server. It will overwrite the existing settings and if my application is removed, the Enterprise Manager for example will not work anymore because the sqldmo.dll is not registered anymore (the deinstaller removed the registering...)
How do I tell the installer to not register the dll if this dll is already registered. It must only register the dll on 'clean' machines.
I'v searched already the net for an answer, but no luck for the moment...