Issue #276 - introduce classes BSTR_ParamArgument and BSTR_ParamResult

src/plugin/AdblockPlusDomTraverser.cpp

Index: src/plugin/AdblockPlusDomTraverser.cpp
===================================================================
--- a/src/plugin/AdblockPlusDomTraverser.cpp
+++ b/src/plugin/AdblockPlusDomTraverser.cpp
@@ -1,5 +1,6 @@
 #include "PluginStdAfx.h"
 
+#include "COM_Value.h"
 #include "PluginClient.h"
 #include "PluginFilter.h"
 #include "PluginSettings.h"
@@ -66,11 +67,10 @@
   // Objects
   else if (tag == "object")
   {
-    CComBSTR bstrInnerHtml;
-
-    if (SUCCEEDED(pEl->get_innerHTML(&bstrInnerHtml)) && bstrInnerHtml)
+    AdblockPlus::COM::BSTR_ParamResult inner_HTML;
+    if (SUCCEEDED(pEl->get_innerHTML(&inner_HTML)))
     {
-      CString sObjectHtml = bstrInnerHtml;
+      CString sObjectHtml = to_CString(inner_HTML);
       CString src;
 
       int posBegin = sObjectHtml.Find(L"VALUE=\"");
@@ -122,16 +122,15 @@
 
   if (SUCCEEDED(pEl->get_style(&pStyle)) && pStyle)
   {
-    CComBSTR bstrDisplay;
-
-    if (SUCCEEDED(pStyle->get_display(&bstrDisplay)) && bstrDisplay && CString(bstrDisplay) == L"none")
+    AdblockPlus::COM::BSTR_ParamResult display;
+    // Explicit call to conversion operator compensates for deficiencies in VS2012
+    if (SUCCEEDED(pStyle->get_display(&display)) && display.operator std::wstring() == L"none")
     {
       return;
     }
 
-    static const CComBSTR sbstrNone(L"none");
-
-    if (SUCCEEDED(pStyle->put_display(sbstrNone)))
+    static const AdblockPlus::COM::BSTR_ParamArgument none(std::wstring(L"none"));
+    if (SUCCEEDED(pStyle->put_display(none)))
     {
       DEBUG_HIDE_EL(indent + L"HideEl::Hiding " + type + L" url:" + url)