PRB: DLLs Not Unloaded After Calling CoFreeUnusedLibraries (301357)

MORE INFORMATION

Steps to Reproduce Behavior

1. Create an empty Win32 Console Application in Microsoft Visual C++ 6.0.
2. Save the following code as main.cpp and add it to the project:

   #include <stdio.h>
   #include <conio.h>
   
   #import "msxml3.dll" named_guids raw_interfaces_only
   using namespace MSXML2;
   
   // Global instance to force load/unload of OLE.
   struct InitOle {
       InitOle()  { ::CoInitialize(NULL); }
       ~InitOle() { ::CoUninitialize();   }
   } _init_InitOle_;			
   
   // Function declarations.
   inline void TESTHR(HRESULT x) {if FAILED(x) _com_issue_error(x);};
   
   void main()
   {
   
   	try
   	{
   		printf( "Note that the msxml3.dll is not loaded yet. Press any key to start the test.\n\n" );
   		_getch();
   
   		// Create an instance of DOMDocument.  This will load Msxml3.dll into the process.
   		IXMLDOMDocument *pDoc = NULL;
   		HRESULT hr = CoCreateInstance(CLSID_DOMDocument, NULL, CLSCTX_INPROC_SERVER,
   			IID_IXMLDOMDocument, (LPVOID*)&pDoc);
   
   		TESTHR(hr);
   
   		// Release the reference.
   		if (pDoc) pDoc->Release();
   		
   		// Free unused resources.
   		CoFreeUnusedLibraries();
   		
   		printf( "Now the DLL is loaded into the process. Monitor the process and note that the DLL will not be released even after 10 minutes. Then press any key to continue..\n\n" );
   		_getch();
   
   		// Second call.
   		CoFreeUnusedLibraries();
   		
   		printf( "Now the DLL should have been unloaded. Press any key to finish.\n\n" );
   		_getch();
   
   	}
   	catch(_com_error &e)
   	{
   		printf("Com Error:\n");
   		printf("Code = %08lx\n", e.Error());
   		printf("Code meaning = %s\n", (char*) e.ErrorMessage());
   		printf("Source = %s\n", (char*) e.Source());
   		printf("Error Description = %s\n", (char*) e.Description());
   	}
   }
   					

3. Run the application and use a utility, such as Process Explorer from Sysinternals (see "References"), to monitor the loading and unloading of Msxml3.dll.