This repo contains experimental code for calling the Win32 API via .NET via Edgejs for the GPII.

##Contents The repo has three projects:

lib-windows-gpii is the c# .NET class library providing a .NET wrapper around Windows API functionality like the SystemParemeterInfo function.

lib-windows-gpii-driver is a c# .NET console application used in development to test functionality within lib-windows-gpii

lib-windows-gpii-edgejs-driver is a nodejs application that demonstrates how functionality in lib-windows-gpii can be accessed from nodejs.

##Tools You will need Visual Studio 2015 (Community) to build the .NET projects.

##Set up

1. Clone this repository
2. Download and install nodejs and Visual Studio 2015 (Community)
3. Run npm install within lib-windows-gpii-edgejs-driver folder
4. Build lib-windows-gpii with Visual Studio to ensure a .dll file is created in the project's Debug folder
5. Run node index.js to demonstrate accessing Windows API functionality via node->edge->.NET
6. Build lib-windows-gpii-driver
7. Run the lib-windows-gpii-driver.exe to demonstrate Windows API use from just .NET

##Tracing the code Lets look at High Contrast as an example:

There are many layers of code and technology in this experiment. The top most layer is the nodejs project in lib-windows-gpii-edgejs-driver. The dotnetfunctions.js module uses edgejs to export nodejs bindings for .NET functions contained within the lib-windows-gpii library. The highcontrast.js module makes use of these bindings.

The entry point from nodejs to .NET is in the lib-windows-gpii/EdgeBindings.cs class which provides async conveinence methods that can be called from edgejs/nodejs. These methods use the lib-windows-gpii/HighContrast.cs class, a .NET wrapper around the Windows API SystemParametersInfo function. The HighContrast class accesses the Windows API via .NET's ability to call out to native functions which is set up in lib-windows-gpii/user32.cs.