C# exception thrown from a C++ managed dll - EEFil

问题:

I get this error from within a normal C# console program that's consuming a DLL produced as the build output of a C++ CLI project. There I have a simple DumbThing public ref class with a static method. I'd like to simply call that function or at least instantiate one tiny DumbThing object and see that C# can call code that it gets from a C++ CLI born DLL, but it's not working as it throws an error that puzzles me even more:

First-chance exception at 0x000007fefd2acacd (KernelBase.dll) in DumbTest.exe: Microsoft C++ exception: EEFileLoadException * __ptr64 at memory location 0x007fc228..

UPDATE: below the original exception, there's another first chance exception:

First-chance exception at 0x77cace3b (ntdll.dll) in DumbTest.exe: 0xC0000005: Access violation reading location 0xffffffffffffffff.

A colleague pointed out to me that it might be a compile time issue (some options), but I don't have any clues what could cause it. Could anyone please provide some starting point hints?

回答1:

It's probably a bitness issue. If you compiled your C++/CLI project for a specific platform, be sure that your C# project has set its platform accordingly. Default for C# projects is "Any CPU" which causes the JIT compiler to generate x64 code on a 64-bit architecture. If your C++/CLI project was built for x86 then it can't be loaded into a x64 process on a 64-bit machine.