How to use a C++ dll in Windows Phone 8.1 XAML App within C++ Runtime Component

Question

I want to use a C++ dll (compiled for arm, x86) within my C# windows phone 8.1 XAML visual studio project.

I created a C++ runtime component to interact with my C++ code. This code needs a precompiled dll. I added my lib file to my project settings. The compilation is running fine. If I start my app with the windows phone 8.1 emulator I get:

The specified module could not be found. (Exception from HRESULT: 0x8007007E)

My Visual Studio Project Structure:

• c#
  • Windows Phone Project
  • Windows Project
  • Shared XAML
• Managed C++
  • RuntimeComponent Windows Phone
  • RuntimeComponent Windows
  • Shared C++ Code (dll used here)

Things I have tried:

• I dragged and dropped the dll into my C++ project and changed properties of content to true.
• I dragged and dropped the dll into my C# project and enabled the option to copy the dll to the output directory

So, how can I use a .lib/.dll library within a C++ Runtime Component Project?

Some more details:

• I want to use Angle (which allows OpenGL Code to be executed as DirectX on Windows/Windows Phone with the Microsoft fork: https://github.com/MSOpenTech/angle/tree/future-dev )
• There are templates provided for Windows Phone 8.1 for pure C++ based on libEGL.lib/dll and libGLES.lib/dll (manually compiled for arm, win32)
• But I want to use a C# project with C++ Runntime Component to be able to use third party libs like the admob ad framework for Windows Phone
• I found out that cocos2d is using Angle but I have not figured out how they did it ( https://github.com/cocos2d/cocos2d-x/tree/v3/templates/cpp-template-default/proj.wp8-xaml )

Answer 1

I managed to get it working.

You have to import the dll into the C#-project. It's important that the dll is in the root the C#-project and that: copy to output directory is not activated.