To get QT working with dev studio you need to install two things.
First, a copy of the QT Visual Studio Libraries.
And the QT Visual Studio Addin.
Download the QT sdk, and install it. It usually installs into a folder like
c:\qt\4.6.2
Then, install the visual studio addin. The addin should add (At least) two new things to Visual Sutdio. A new "Qt" project in the Create New Project Wizard, and a Qt menu.
Qt supports building your project against multiple builds of Qt, so the first thing you need to do is go to the Qt menu, and point it to the directory you installed the Qt SDK to. It all went well it should auto populate with c:\qt\4.6.2
Then, use the Wizard to create a new Qt project in Visual Studio.
If you are creating your first Qt project in Visual Studio this way, there is no need to fiddle with .pro files or doing any kind of "stuff" outside Visual Studio to get a project going. The Visual Studio addin sets up the workspace to do all the pre-compiles needed by the Qt build environment.
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Note: The Qt SDK at this URL
comes with the MinGW runtine for GCC, and Qt Creator embedded. This is no good for Visual Studio. This build installs to a folder like
c:\Qt\2010.2