Issue #276 - introduce classes BSTR_ParamArgument and BSTR_ParamResult

src/plugin/PluginDomTraverserBase.h

Index: src/plugin/PluginDomTraverserBase.h
===================================================================
--- a/src/plugin/PluginDomTraverserBase.h
+++ b/src/plugin/PluginDomTraverserBase.h
@@ -1,11 +1,10 @@
 #ifndef _PLUGIN_DOM_TRAVERSER_BASE_H_
 #define _PLUGIN_DOM_TRAVERSER_BASE_H_
 
-
+#include "COM_Value.h"
 #include "PluginTypedef.h"
 #include "PluginTab.h"
 
-
 class CPluginDomTraverserCacheBase
 {
 public:
@@ -222,12 +221,11 @@
         CComQIPtr<IWebBrowser2> pFrameBrowser = pFrameDispatch;
         if (pFrameBrowser)
         {
-          CComBSTR bstrSrc;
           CString src;
-
-          if (SUCCEEDED(pFrameBrowser->get_LocationURL(&bstrSrc)))
+          AdblockPlus::COM::BSTR_ParamResult result;
+          if (SUCCEEDED(pFrameBrowser->get_LocationURL(&result)))
           {
-            src = bstrSrc;
+            src = to_CString(result);
             CPluginClient::UnescapeUrl(src);
           }
 
@@ -372,13 +370,13 @@
   m_criticalSection.Unlock();
 
   // Get tag
-  CComBSTR bstrTag;
-  if (FAILED(pEl->get_tagName(&bstrTag)) || !bstrTag)
+  AdblockPlus::COM::BSTR_ParamResult result;
+  if (FAILED(pEl->get_tagName(&result)) || !result.operator std::wstring().empty())
   {
     return;
   }
 
-  CString tag = bstrTag;
+  CString tag = to_CString(result);
   tag.MakeLower();
 
   // Custom OnElement