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Problems building 32-bit .NETapplication that uses 64-bit COM server

Posted By:      Posted Date: August 28, 2010    Points: 0   Category :.NET Framework
 
I have a .NET application that uses a 3rd party 32bit DLL, so I need to build it using the x86 platform instead of 'Any CPU'. I also have a 64bit out-of-proc COM server that I reference the EXE directly in the project.  The project builds fine for 'Any CPU' but can't run on 64bit Windows because of the 32-bit dll.  This is expected.  But when I specify 'x86' the build fails and I get: TlbImp : error TI0000: A single valid machine type compatible with the input type library must be specified. C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets(1558,9): warning MSB3283: Cannot find wrapper assembly for type library "Engine_ATLServiceLib". Basically this tells me that it failed to build the Interop Dll for the COM server object.  First off I am puzzled that I get this message when a platform is specified, I would've expected this when I build for 'Any CPU'.  That aside, I am thinking the TlbImp needs a '/Win32' or something, but I can't see how to do this in the IDE based on the platform.  Furthermore I am wondering if the marshalling in said Interop dll will be correct when the 32bit managed code talks with the 64bit COM object. Does anybody know what to do here?


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