title: Missing input file with protoc in protocol buffer
body: <p>I currently have a file called addressbook.proto in next to my protoc.exe. I am having difficulty generating the .h and the .cc file. Here is what I am doing</p>
  
  <pre><code>protoc --cpp_out=c:\addressbook.proto
  </code></pre>
  
  <p>However I get the following response</p>
  
  <pre><code>Missing input file.
  </code></pre>
  
  <p>Any suggestions on what I might be doing wrong ?</p>