I am attempting to write a user function library for the crystal reports version that ships with Visual Studio 2010. Following the walkthrough on the Business Objects website (although that is for VS2005) I have successfully created my .dll file and added it to the GAC, and it appears in the function list under 'Additional Functions' in the Crystal Reports formula editor. However when I use the function on in my Windows forms application, I get the error "UFL 'u212com.dll' that implements this function is missing.". This is on my development machine and I have installed the latest service pack for Crystal Reports for VS2010 (64-bit). My OS is Windows 7 64-bit.
I have two questions:
1) What version of the .NET framework should my class library be targeting? My windows forms application targets the .NET framework version 4, but should I be doing the same thing for the .dll for Crystal Reports? It does show up in the formula editor though, so I guess that means that Crystal Reports recognises it correctly.
2) I have done a search on the PC for the file 'u212com.dll' and it is in the folder C:\Program Files (x86)\SAP BusinessObjects\Crystal Reports for .NET Framework 4.0\Common\SAP BusinessObjects Enterprise XI 4.0\win64_x64 (and also in the equivalent 32-bit folder) Is this correct, or is there is a specific 64-bit version of this file?
Or is it something else that I am missing? Thanks in advance for any suggestions.