How to create a folder in Visual Studio C++ 2012

Question

I have started my first bigger project with Visual Studio 2012 in C++. I will structure my Source-files in folders, but I can not find where I can create real folders, like in t

Answer 1

The IDE has a command for that, "New Folder". It is even present in the Project + Add context menu, something you can see when you look at the context menu with Tools + Customize. It is however hidden in the C++ IDE. Intentionally.

Its important to understand why it is hidden. It keeps you out of trouble, the kind of trouble you'll get into when you create folders with Explorer.

At issue is the way C++ files get built. They produce an .obj file when the compiler is done with them. That obj file is stored in a directory whose name is a project setting. You see it with Project + Properties, General, Intermediate Directory setting. For an individual .cpp file, it is C/C++, Output Files, Object File Name. The default for that one is $(IntDir) a macro that tells the compiler to use the Intermediate Directory setting. With the default settings, all .obj files for the Debug build end up in the Debug subdirectory. Release subdirectory for the Release build. Regardless where the .cpp was stored.

Maybe you see the bear trap by now. If you create a subdirectory with .cpp files then you'll get in trouble when that subdirectory has a .cpp file whose name is identical to another .cpp file in another subdirectory. They produce an .obj file with the same name. One overwrites the other, which ever one was compiled last. That produces very mystifying linker errors. You'll get duplicate symbol errors because the last built .obj file is linked twice and missing symbol errors for the overwritten .obj file.

So go ahead and create a subdirectory but beware this problem. You have to change the Object File Name setting for the .cpp file if such a collision happens.

Answer 2

This is mildly annoying, however, here is what can be done:

Create the new folder in Visual Studio. This does not create a new folder in the file system. Add a new item to the folder. Choose the proper directory for the item.

For example, if your project is at %Documents%\Project, and your new folder name is Folder, then you add a new item to that folder at %Documents%\Project\Folder.

Visual Studio 2012 will put the item in the folder where you want it. If you add a new item, it will default to the same folder. That is where the annoying part comes in. If you create 3 folders for all your project items and try to add a new item to each folder, Visual Studio will try to put all 3 items in the same place in the file system (the last folder you added a new item to), while putting items into the correct Visual Studio folder.

It is possible there is a setting for this in Visual Studio. I haven't found it. I also haven't looked that hard.