title: Use dumpbin to show External symbol(UNDEF) for DLL?
body: <p>We all know we could use dumpbin for .obj file to show all the symbols including external ones.</p>
  
  <pre><code>dumpbin /symbols ExternCTest.ob
  00F 00000000 UNDEF  notype ()    External     | ?foo@@YAHH@Z (int __cdecl foo(int))
  </code></pre>
  
  <p>But I am wondering how could I do this for DLL ? 
  I have also tried dumpbin /exports as well as dependency walker but it's <strong>NOT</strong> showing external symbols.</p>
  
  <p>How should I do it ?</p>
  
  <p>Thanks</p>