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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
//*****************************************************************************
// ClassFactory.cpp
//
//
// Dll* routines for entry points, and support for COM framework. The class
// factory and other routines live in this module.
//
// This file is not included in the standalone metadata version, because standalone can't use COM,
// let alone COM-activation. So this file gets linked into mscorwks.dll, and then the mscorwks
// class factory delegates to this co-creation routine.
//
//*****************************************************************************
#include "stdafx.h"
#ifdef FEATURE_METADATA_IN_VM
#include "classfactory.h"
#include "disp.h"
#include "regmeta.h"
#include "mscoree.h"
#include "corhost.h"
#include "clrprivhosting.h"
extern HRESULT TypeNameFactoryCreateObject(REFIID riid, void **ppUnk);
#include <ndpversion.h>
//********** Locals. **********************************************************
HINSTANCE GetModuleInst();
// @telesto - why does Telesto export any Co-classes at all?
// This map contains the list of coclasses which are exported from this module.
// NOTE: CLSID_CorMetaDataDispenser must be the first entry in this table!
const COCLASS_REGISTER g_CoClasses[] =
{
// pClsid szProgID pfnCreateObject
{ &CLSID_CorMetaDataDispenser, W("CorMetaDataDispenser"), Disp::CreateObject },
{ NULL, NULL, NULL }
};
//*****************************************************************************
// Called by COM to get a class factory for a given CLSID. If it is one we
// support, instantiate a class factory object and prepare for create instance.
//
// Notes:
// This gets invoked from mscorwks's DllGetClassObject.
//*****************************************************************************
STDAPI MetaDataDllGetClassObject( // Return code.
REFCLSID rclsid, // The class to desired.
REFIID riid, // Interface wanted on class factory.
LPVOID FAR *ppv) // Return interface pointer here.
{
MDClassFactory *pClassFactory; // To create class factory object.
const COCLASS_REGISTER *pCoClass; // Loop control.
HRESULT hr = CLASS_E_CLASSNOTAVAILABLE;
// Scan for the right one.
for (pCoClass=g_CoClasses; pCoClass->pClsid; pCoClass++)
{
if (*pCoClass->pClsid == rclsid)
{
// Allocate the new factory object.
pClassFactory = new (nothrow) MDClassFactory(pCoClass);
if (!pClassFactory)
return (E_OUTOFMEMORY);
// Pick the v-table based on the caller's request.
hr = pClassFactory->QueryInterface(riid, ppv);
// Always release the local reference, if QI failed it will be
// the only one and the object gets freed.
pClassFactory->Release();
break;
}
}
return hr;
}
//*****************************************************************************
//
//********** Class factory code.
//
//*****************************************************************************
//*****************************************************************************
// QueryInterface is called to pick a v-table on the co-class.
//*****************************************************************************
HRESULT STDMETHODCALLTYPE MDClassFactory::QueryInterface(
REFIID riid,
void **ppvObject)
{
HRESULT hr;
// Avoid confusion.
*ppvObject = NULL;
// Pick the right v-table based on the IID passed in.
if (riid == IID_IUnknown)
*ppvObject = (IUnknown *) this;
else if (riid == IID_IClassFactory)
*ppvObject = (IClassFactory *) this;
// If successful, add a reference for out pointer and return.
if (*ppvObject)
{
hr = S_OK;
AddRef();
}
else
hr = E_NOINTERFACE;
return hr;
}
//*****************************************************************************
// CreateInstance is called to create a new instance of the coclass for which
// this class was created in the first place. The returned pointer is the
// v-table matching the IID if there.
//*****************************************************************************
HRESULT STDMETHODCALLTYPE MDClassFactory::CreateInstance(
IUnknown *pUnkOuter,
REFIID riid,
void **ppvObject)
{
HRESULT hr;
BEGIN_ENTRYPOINT_NOTHROW;
// Avoid confusion.
*ppvObject = NULL;
_ASSERTE(m_pCoClass);
// Aggregation is not supported by these objects.
if (pUnkOuter)
IfFailGo(CLASS_E_NOAGGREGATION);
// Ask the object to create an instance of itself, and check the iid.
hr = (*m_pCoClass->pfnCreateObject)(riid, ppvObject);
ErrExit:
END_ENTRYPOINT_NOTHROW;
return hr;
}
HRESULT STDMETHODCALLTYPE
MDClassFactory::LockServer(
BOOL fLock)
{
// @FUTURE: Should we return E_NOTIMPL instead of S_OK?
return S_OK;
}
#endif //FEATURE_METADATA_IN_VM
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