title: How to write a custom native visualizer DLL for Visual Studio 2012 debugger?
body: <p>What is needed to write a custom native visualizer DLL in C++ for Visual Studio 2012 debugger? I want to display a value that can only be calculated from a class/struct on-demand hence a native visualizer DLL is required. Visual Studio 2012 uses a new method for implementing native visualizers called Natvis. As of this time, there is very little correct information on Natvis and especially on using Natvis to call a visualizer DLL. The DLL will calculate a display string based on class/struct member values.</p>