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I have a DLL exception I am encountering:

 response threw exception: Could not load file or assembly  or one of its dependencies. An attempt was made to load a program with an incorrect format.

I have all source code for the following DLL/library combinations. I am trying to figure if I have a strange combination or what I need to check to ensure this runs. I have a native C++ code in a static library which is called by a managed C++ CLR supported DLL. Everything seems to work fine until the following point.

I created a test C# EXE console application to call the managed C++ CLR supported DLL. This works as expected. The difference where the exception is thrown when there is a C# Class library calling this same managed C++ CLR supported DLL. Is this supported at all or is this the reason why the exception gets thrown? If this combination is incorrect, is there any workaround to get a C# Class DLL to call the managed C++ CLR supported DLL.

Everything is created with Windows 7 64 bit with Visual Studio 2012. All projects are in Release mode with x64 bit platform selected.

leppie
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heavy rocker dude
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2 Answers2

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In every case I've seen, this is where a 32-bit C# app is trying to load a 64-bit C++ or C++/CLI DLL or a 64-bit C# app is trying to load a 32-bit C++ or C++/CLI DLL.

The next step I usually take is to use Dependency Walker to load the C++/CLI dll. Dependency walker will show you what DLLs your DLL is trying to load. In some cases I've had a 32-bit DLL with the same name as a 64-bit DLL appear in the Path first, hence it tries to load the wrong DLL.

Note that Dependency Walker will show a 64 on the icon next to 64-bit DLLs and will show a message along the lines of: "Error: Modules with different CPU types were found." in the info box at the bottom

David Hope
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my best bet is that the c++ dll is compiled as win32 your c# dll is set to Any CPU and you are running on a 64 bit system...

Matthew Sanford
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