CR: Fix stability issues with Producer Active-x Control

Synopsis
========
Fix for Stability in Active-X control

Branches: PRODUCER_13_0_RN and HEAD.
Suggested Reviewer: Anyone.


Description
===========
Stability issue was causes due following.
Plugin Handler registers itself to be called at fixed interval.
During callback it checks, if there are DLL's which can be unloaded and
unloads those DLL.
Above call was resulting in plugin handler unloading encession DLL.
When OnPaint Message was called Active-x sample was trying to draw a
sample which was refering to unloaded memory and crashing.

encsession was exposing CanUnload method, which calls
CHXBaseCountingObject::ObjectsActive().
All objects within encsession are not derived from CHXBaseCountingObject
and ObjectActive count is not set.

Fix was to not expose CanUnload method. Unloading encession by plugin
handler is not required for producer application. This functionality might
be good to
have for mobile applications. For now I am proposing to not have this
method. If it is required then we should implement it correctly.


Files Affected
==============
client/encodesvc/engine/encsession/hxplugin_entrypoints.cpp
client/encodesvc/engine/encsession/Umakefil

Testing Performed
=================
Tested with active-x sample.

Performance Tests:
- None

Platforms Tested: win32-i386-vc7
Build verified: win32-i386-vc7

QA Hints
========
Please do long encodes with GUI and make GUI preview paint itself when
ideal by bringing another application infront.

Index: hxplugin_entrypoints.cpp
===================================================================
RCS file:
/cvsroot/client/encodesvc/engine/encsession/hxplugin_entrypoints.cpp,v
retrieving revision 1.1
diff -u -r1.1 hxplugin_entrypoints.cpp
--- hxplugin_entrypoints.cpp    10 Sep 2008 18:46:35 -0000      1.1
+++ hxplugin_entrypoints.cpp    8 Jun 2009 05:57:56 -0000
@@ -79,9 +79,11 @@

     return retVal;
 }
-
+/*
+CHXBaseCountingObject is not base class of all objects in this DLL.
+Hence exposing this will lead to Plugin Handler unloading this DLL.
 STDAPI ENTRYPOINTCALLTYPE ENTRYPOINT(CanUnload2)(void)
 {
     return (CHXBaseCountingObject::ObjectsActive() ? HXR_FAIL : HXR_OK);
 }
-
+*/
cvs diff: Diffing docs
cvs diff: Diffing platform
cvs diff: Diffing platform/win32


Index: Umakefil
===================================================================
RCS file: /cvsroot/client/encodesvc/engine/encsession/Umakefil,v

Commented following line. Diff is messed up.

#project.ExportFunction("CanUnload2",
#                       "void")