276 lines
8.2 KiB
C++
276 lines
8.2 KiB
C++
//==============================================================;
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//
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// This source code is only intended as a supplement to existing Microsoft documentation.
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//
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//
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//
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//
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// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
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// KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
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// PURPOSE.
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//
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// Copyright (C) 1999 Microsoft Corporation. All Rights Reserved.
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//
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//
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//
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//==============================================================;
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#include "DataObj.h"
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#include "guids.h"
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#include "DeleBase.h"
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#include "Space.h"
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//
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// This is the minimum set of clipboard formats we must implement.
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// MMC uses these to get necessary information from our snapin about
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// our nodes.
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//
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// we need to do this to get around MMC.IDL - it explicitly defines
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// the clipboard formats as WCHAR types...
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#define _T_CCF_DISPLAY_NAME _T("CCF_DISPLAY_NAME")
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#define _T_CCF_NODETYPE _T("CCF_NODETYPE")
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#define _T_CCF_SZNODETYPE _T("CCF_SZNODETYPE")
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#define _T_CCF_SNAPIN_CLASSID _T("CCF_SNAPIN_CLASSID")
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#define _T_CCF_OBJECT_TYPES_IN_MULTI_SELECT _T("CCF_OBJECT_TYPES_IN_MULTI_SELECT")
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#define _T_CCF_INTERNAL_SNAPIN _T("{2479DB32-5276-11d2-94F5-00C04FB92EC2}")
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// These are the clipboard formats that we must supply at a minimum.
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// mmc.h actually defined these. We can make up our own to use for
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// other reasons. We don't need any others at this time.
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UINT CDataObject::s_cfDisplayName = RegisterClipboardFormat(_T_CCF_DISPLAY_NAME);
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UINT CDataObject::s_cfNodeType = RegisterClipboardFormat(_T_CCF_NODETYPE);
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UINT CDataObject::s_cfSZNodeType = RegisterClipboardFormat(_T_CCF_SZNODETYPE);
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UINT CDataObject::s_cfSnapinClsid = RegisterClipboardFormat(_T_CCF_SNAPIN_CLASSID);
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UINT CDataObject::s_cfInternal = RegisterClipboardFormat(_T_CCF_INTERNAL_SNAPIN);
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//We must also supply a data object for CCF_OBJECT_TYPES_IN_MULTI_SELECT
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UINT CDataObject::s_cfMultiSelect = RegisterClipboardFormat(_T_CCF_OBJECT_TYPES_IN_MULTI_SELECT);
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CDataObject::CDataObject(MMC_COOKIE cookie, DATA_OBJECT_TYPES context)
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: m_lCookie(cookie), m_context(context), m_cref(0)
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{
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//Do the following if the data object is a multiselection data object
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if ( MMC_MULTI_SELECT_COOKIE == m_lCookie ) {
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pCookies = new MMC_COOKIE[MAX_COOKIES];
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for (int n = 0; n < MAX_COOKIES; n++) {
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pCookies[n] = NULL;
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}
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}
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}
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CDataObject::~CDataObject()
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{
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//Do the following if the data object is a multiselection data object
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if ( MMC_MULTI_SELECT_COOKIE == m_lCookie )
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delete [] pCookies;
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}
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///////////////////////
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// IUnknown implementation
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///////////////////////
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STDMETHODIMP CDataObject::QueryInterface(REFIID riid, LPVOID *ppv)
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{
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if (!ppv)
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return E_FAIL;
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*ppv = NULL;
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if (IsEqualIID(riid, IID_IUnknown))
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*ppv = static_cast<IDataObject *>(this);
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else if (IsEqualIID(riid, IID_IDataObject))
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*ppv = static_cast<IDataObject *>(this);
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if (*ppv)
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{
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reinterpret_cast<IUnknown *>(*ppv)->AddRef();
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return S_OK;
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}
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return E_NOINTERFACE;
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}
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STDMETHODIMP_(ULONG) CDataObject::AddRef()
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{
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return InterlockedIncrement((LONG *)&m_cref);
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}
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STDMETHODIMP_(ULONG) CDataObject::Release()
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{
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if (InterlockedDecrement((LONG *)&m_cref) == 0)
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{
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delete this;
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return 0;
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}
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return m_cref;
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}
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/////////////////////////////////////////////////////////////////////////////
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// IDataObject implementation
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//
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HRESULT CDataObject::GetDataHere(
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FORMATETC *pFormatEtc, // [in] Pointer to the FORMATETC structure
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STGMEDIUM *pMedium // [out] Pointer to the STGMEDIUM structure
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)
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{
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const CLIPFORMAT cf = pFormatEtc->cfFormat;
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IStream *pStream = NULL;
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CDelegationBase *base = GetBaseNodeObject();
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HRESULT hr = CreateStreamOnHGlobal( pMedium->hGlobal, FALSE, &pStream );
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if ( FAILED(hr) )
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return hr; // Minimal error checking
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hr = DV_E_FORMATETC; // Unknown format
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if (cf == s_cfDisplayName) {
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const _TCHAR *pszName = base->GetDisplayName();
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MAKE_WIDEPTR_FROMTSTR(wszName, pszName);
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// get length of original string and convert it accordingly
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ULONG ulSizeofName = lstrlen(pszName);
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ulSizeofName++; // Count null character
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ulSizeofName *= sizeof(WCHAR);
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hr = pStream->Write(wszName, ulSizeofName, NULL);
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} else if (cf == s_cfNodeType) {
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const GUID *pGUID = (const GUID *)&base->getNodeType();
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hr = pStream->Write(pGUID, sizeof(GUID), NULL);
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} else if (cf == s_cfSZNodeType) {
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LPOLESTR szGuid;
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hr = StringFromCLSID(base->getNodeType(), &szGuid);
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if (SUCCEEDED(hr)) {
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hr = pStream->Write(szGuid, wcslen(szGuid), NULL);
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CoTaskMemFree(szGuid);
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}
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} else if (cf == s_cfSnapinClsid) {
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const GUID *pGUID = NULL;
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pGUID = &CLSID_CComponentData;
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hr = pStream->Write(pGUID, sizeof(GUID), NULL);
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} else if (cf == s_cfInternal) {
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// we are being asked to get our this pointer from the IDataObject interface
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// only our own snap-in objects will know how to do this.
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CDataObject *pThis = this;
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hr = pStream->Write( &pThis, sizeof(CDataObject*), NULL );
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}
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pStream->Release();
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return hr;
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}
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HRESULT CDataObject::GetData (LPFORMATETC lpFormatetcIn, LPSTGMEDIUM lpMedium)
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{
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HRESULT hr = S_FALSE;
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const CLIPFORMAT cf = lpFormatetcIn->cfFormat;
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CDelegationBase *base = GetBaseNodeObject();
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if (cf == s_cfMultiSelect) {
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// MMC requires support for this format to load any extensions
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// that extend the selected result items
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BYTE byData[256] = {0};
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SMMCObjectTypes* pData = reinterpret_cast<SMMCObjectTypes*>(byData);
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//We need the node type GUID of the selected items.
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//from CRocket::thisGuid
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GUID guid = { 0x29743811, 0x4c4b, 0x11d2, { 0x89, 0xd8, 0x0, 0x0, 0x21, 0x47, 0x31, 0x28 } };
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//Enter data required for the SMMCObjectTypes structure
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//count specifies the number of unique node types in the multiselection
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//Here, all CRocket items are of the same node type, so count == 1.
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pData->count = 1;
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pData->guid[0] = guid;
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// Calculate the size of SMMCObjectTypes.
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int cb = sizeof(GUID)*(pData->count) + sizeof (SMMCObjectTypes);
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//Fill out parameters
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lpMedium->tymed = TYMED_HGLOBAL;
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lpMedium->hGlobal = ::GlobalAlloc(GMEM_SHARE|GMEM_MOVEABLE, cb);
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if (lpMedium->hGlobal == NULL)
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return STG_E_MEDIUMFULL;
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BYTE* pb = reinterpret_cast<BYTE*>(::GlobalLock(lpMedium->hGlobal));
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CopyMemory(pb, pData, cb);
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::GlobalUnlock(lpMedium->hGlobal);
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hr = S_OK;
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}
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return hr;
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}
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/////////////////////////////////////////////////////////////////////////////
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// Global helper functions to help work with dataobjects and
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// clipboard formats
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//---------------------------------------------------------------------------
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// Returns the current object based on the s_cfInternal clipboard format
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//
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CDataObject* GetOurDataObject (
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LPDATAOBJECT lpDataObject // [in] IComponent pointer
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)
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{
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HRESULT hr = S_OK;
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CDataObject *pSDO = NULL;
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// check to see if the data object is a special data object.
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if ( IS_SPECIAL_DATAOBJECT (lpDataObject) )
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{
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//Code for handling a special data object goes here.
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//Note that the MMC SDK samples do not handle
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//special data objects, so we exit if we get one.
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return NULL;
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}
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STGMEDIUM stgmedium = { TYMED_HGLOBAL, NULL };
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FORMATETC formatetc = { CDataObject::s_cfInternal, NULL, DVASPECT_CONTENT, -1, TYMED_HGLOBAL };
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// Allocate memory for the stream
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stgmedium.hGlobal = GlobalAlloc( GMEM_SHARE, sizeof(CDataObject *));
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if (!stgmedium.hGlobal) {
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hr = E_OUTOFMEMORY;
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}
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if SUCCEEDED(hr)
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// Attempt to get data from the object
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hr = lpDataObject->GetDataHere( &formatetc, &stgmedium );
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// stgmedium now has the data we need
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if (SUCCEEDED(hr)) {
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pSDO = *(CDataObject **)(stgmedium.hGlobal);
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}
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// if we have memory free it
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if (stgmedium.hGlobal)
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GlobalFree(stgmedium.hGlobal);
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return pSDO;
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} // end GetOurDataObject()
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