Getting the VCProjectEngine in a C++ Package

Question

I'm working on a package for VS2005 written in C++, and am having trouble getting an instance of the VCProjectEngine object.  I *think* something like the following should work, but QueryCachedService is failing with E_NOINTERFACE.  Here's the command handler.  It's the only thing I've customized in a wizard-generated package:

#include "StdAfx.h"
#include "Package.h"
//#import <VCProjectEngine.dll> rename ("PropertySheet", "VCPropertySheetX")
#import "C:\Program Files\Microsoft Visual Studio 8\VC\vcpackages\VCProject.dll" raw_interfaces_only raw_native_types  
#import "C:\Program Files\Microsoft Visual Studio 8\VC\vcpackages\VCProjectEngine.dll" raw_interfaces_only raw_native_types rename("PropertySheet", "__PropertySheet")  
using namespace VCProjectEngineLibrary;


// Command handler called when the user selects the "My Command" command.
void CVSAnnotationPackage::OnMyCommand(CommandHandler* /*pSender*/,
                                       DWORD /*flags*/,
                                       VARIANT* /*pIn*/,
                                       VARIANT* /*pOut*/)
{
    HRESULT hr;
    CComPtr<VCProjectEngine> spEngine;

    hr = this->GetVsSiteCache().QueryCachedService<VCProjectEngine, __uuidof(VCProjectEngine)>(&spEngine);

	if( FAILED( hr ) || !spEngine )
    {
        OutputDebugString (L"Failed to create VCProjectEngine!\n");
        return;
    }

    // Get the collection of VC Projects
    CComPtr<IDispatch> spDispProjects;
    hr = spEngine->get_Projects(&spDispProjects);

    CComQIPtr<IVCCollection> spCollProjects = spDispProjects;
    LONG nProjects;
    hr = spCollProjects->get_Count (&nProjects);
}

Answer 1

P.S.  If I can get from an IVsProject to a VCProject, that would also solve my problem.  But I don't see any way to get there from here...

Thanks for the help.

     - Barry

Answer 2

Hi Barry,

I don't think the VCProjectEngine is surfaced as a global service. But you should be able to retrieve the VCProject  easily enough, given you have an IVsProject. The object that implements IVsProject also implements IVsHierarchy. Cast that interface to an IVsHierarchy, and try calling IVsHierarchy.GetProperty with VSITEMID_ROOT and VSHPROPID_ExtObject. This returns the IDispatch interface correlates to the EnvDTE.Project interface. From there you should be able to cast the Project.Object property to a VCProject interface.

Sincerely,

---

Ed Dore

Answer 3

Thanks Ed.  I'll give that a try.

     - Barry

Answer 4

P.S.  I worked around this problem by getting the DTE and using the automation objects.  Is there any reason to go back to traversing the hierarchy instead?

     - Barry

Answer 5

Thanks Ed.  That did it.  It's a pity there isn't a more direct path from the IVsHierarchy object to the VCProject.

     - Barry