Incorrect format Exception while trying to call C++ dll from C#

Question

I\'m Using C# WPF.
I have a C++ test dll as follow:
.h:

extern \"C\" __delspec(dllexport) void TestMethod();

.cpp file:

Answer 1

This seems to be 32bit/ 64 bit problem. Seems like your C++ dll and C# calling assembly are built for different platform targets. Try compiling both for the same platform (either x86 or x64) and then calling the function.