title: Why can't I find <QTcpServer>?
body: <p>My VS2010 can only <code>#include &lt;Qt/qtcpserver.h&gt;</code> but can't <code>#include &lt;QTcpServer&gt;</code>.</p>
  
  <p>Qt assistant suggested <code>&lt;QTcpServer&gt;</code> be included to apply TCP server but it seems this header cannot be found by my VS2010, but it can find <code>&lt;Qt/qtcpserver.h&gt;</code> and these two headers seems to be the same.<br>
  Are they the same and why can't I find <code>&lt;QTcpServer&gt;</code> ?</p>
  
  <p>PS:<br>
  I'm currently using Qt4 plugin with VS2010.<br>
  Here's a snapshot of my VS project files:<br>
  <img src="https://i.stack.imgur.com/RLq2V.png" alt="enter image description here"></p>
  
  <p>No <code>.pro</code> file there. </p>