from many version ago, the arduino IDE support the subfolder inside the sketch folder.
This is a very important improvement for Arduino, so you can put your personal .h/.cpp inside a subfolder of the sketch, or you can put your personal library directly inside sketch folder.

This is not supported in VisualMicro ?
I have the last 1604.18.0 on VS2015 and this kind of include do not work

#include "SubfolderTest/lib_test.h"

fatal error: SubfolderTest/lib_test.h: No such file or directory 

Always thanks for your great product and support 

Yes,
the attached example work on Arduino IDE and not on VisualMicro.

Many people always use subfolder inside sketchfolder, so this is a real important update for VisualMicro

also .cpp and library, this is the real improvement

I have looked at this again and Visual Micro does support headers in sub folders but you need to include them in the project. 

The full/paid version of visual micro also supports cpp code in sub folders and also supports libraries in a special sub folder name. I haven't seen anything in the arduino ide that supports these so a project with a library and also with .cpp code in a sub folder that works in arduino will be useful thanks.

You can see in the attached picture how to include code in your projects. Please try it and let me know if it makes sense. I will consider if Visual Micro should automatically include header files in the build without need to include them in the project.

Thanks I don't know why my first test with arduino failed.

I have looked into this and Arduino has discovered files in sub folders since the latter part of last year when the new "deep search auto resolve" was introduced to the build processes. The feature was initially introduced for library-in-library discovery but has been extended to local project files and sub folders.

Visual Micro is not automatically looking in the project sub folders and will be extended to do that.

However as per my previous message Visual Micro does allow for this. Did you try my earlier suggestion? Did you notice the "Show all files" option on the solution explorer. You can highlight all files or folders (use CTRL key for multiple) then right click "Include in project"

You can see in the image below that I have included the files in the project. It then compiled correctly.

I still can't see a way for the Arduino Ide to determine a library which would be #include without the sub folder name. ie: #include "myLib.h". Were you suggesting that Arduino Libraries should work or just talking about local project code in sub folders?

That's just the same as the more.cpp isn't it. Just manually adding the lib sources to the project and then include same way as Arduino ide?

Doesn't that work?

Thanks. Yes I agree although I will give it some thought.

A small note also to say that you can not do that with some libraries because libraries are normally compiled separate to the project code for important reasons. So if some libs fail to compile as project code you should know why

I will think about the auto discovery of local code. Certainly the first time an existing arduino project is opened the code in folders below the project should be automatically included in the solution explorer.

After that I think we need a menu option. Experienced Visual Studio users will find it confusing but Arduino users will expect it 

To answer the question I thought were asking...

With the full/paid version of visual micro you can click "vMicro>Add Code>Add new arduino library". This will show you how to include an Arduino library below the sketch code but still allow the library to be #included and compiled as a genuine Arduino library. 

Library #includes do not have any path in the name so it will be #include "myLib.h" not include "src/_micro-api/libraries/myLib/myLib.h"

Thanks again