The problem I had solved. :) Because I use the project for DllExport & DllImport，and then must expose the methods by extern "C" keyword (powerlanage can call the exposed methods). the below definition code : MCExtfuncs.h #pragma once #ifdef MCExtFuncs_API_EXPORT #define MCExtFuncs_API __declspec( dl...

Hi idnotbe:

I had the same problem as you.
My IDE is Visual Studio 2015 Community, Windows 10-64bit, Multicharts 64bit 9.1.

I had changed the build platform to x64, but the error is same.
Can you attach your new solution file for this testdll ?

Thanks for your kindly share~