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