153 lines
4.4 KiB
C++
153 lines
4.4 KiB
C++
//+--------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1994 - 1998.
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//
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// File: dataobj.cpp
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//
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// Contents: implementation of IDataObject
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//
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// Classes: CDataObject
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//
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// History: 03-14-1998 stevebl Commented
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//
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//---------------------------------------------------------------------------
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#include "precomp.hxx"
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#ifdef _DEBUG
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#define new DEBUG_NEW
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#undef THIS_FILE
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static char THIS_FILE[] = __FILE__;
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#endif
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unsigned int CDataObject::m_cfNodeType = RegisterClipboardFormat(CCF_NODETYPE);
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unsigned int CDataObject::m_cfNodeTypeString = RegisterClipboardFormat(CCF_SZNODETYPE);
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unsigned int CDataObject::m_cfDisplayName = RegisterClipboardFormat(CCF_DISPLAY_NAME);
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unsigned int CDataObject::m_cfCoClass = RegisterClipboardFormat(CCF_SNAPIN_CLASSID);
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unsigned int CDataObject::m_cfInternal = RegisterClipboardFormat(SNAPIN_INTERNAL);
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/////////////////////////////////////////////////////////////////////////////
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// CDataObject implementations
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STDMETHODIMP CDataObject::GetDataHere(LPFORMATETC lpFormatetc, LPSTGMEDIUM lpMedium)
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{
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HRESULT hr = DV_E_CLIPFORMAT;
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AFX_MANAGE_STATE(AfxGetStaticModuleState());
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// Based on the CLIPFORMAT write data to the stream
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const CLIPFORMAT cf = lpFormatetc->cfFormat;
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if(cf == m_cfNodeType)
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{
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hr = CreateNodeTypeData(lpMedium);
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}
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else if(cf == m_cfNodeTypeString)
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{
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hr = CreateNodeTypeStringData(lpMedium);
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}
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else if (cf == m_cfDisplayName)
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{
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hr = CreateDisplayName(lpMedium);
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}
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else if (cf == m_cfCoClass)
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{
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hr = CreateCoClassID(lpMedium);
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}
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else if (cf == m_cfInternal)
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{
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hr = CreateInternal(lpMedium);
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}
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return hr;
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}
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// Note - Sample does not implement these
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STDMETHODIMP CDataObject::GetData(LPFORMATETC lpFormatetcIn, LPSTGMEDIUM lpMedium)
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{
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return E_NOTIMPL;
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}
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STDMETHODIMP CDataObject::EnumFormatEtc(DWORD dwDirection, LPENUMFORMATETC* ppEnumFormatEtc)
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{
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return E_NOTIMPL;
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}
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/////////////////////////////////////////////////////////////////////////////
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// CDataObject creation members
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HRESULT CDataObject::Create(const void* pBuffer, int len, LPSTGMEDIUM lpMedium)
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{
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HRESULT hr = DV_E_TYMED;
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// Do some simple validation
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if (pBuffer == NULL || lpMedium == NULL)
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return E_POINTER;
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// Make sure the type medium is HGLOBAL
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if (lpMedium->tymed == TYMED_HGLOBAL)
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{
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// Create the stream on the hGlobal passed in
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LPSTREAM lpStream;
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hr = CreateStreamOnHGlobal(lpMedium->hGlobal, FALSE, &lpStream);
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if (SUCCEEDED(hr))
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{
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// Write to the stream the number of bytes
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unsigned long written;
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hr = lpStream->Write(pBuffer, len, &written);
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// Because we told CreateStreamOnHGlobal with 'FALSE',
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// only the stream is released here.
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// Note - the caller (i.e. snap-in, object) will free the HGLOBAL
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// at the correct time. This is according to the IDataObject specification.
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lpStream->Release();
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}
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}
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return hr;
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}
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HRESULT CDataObject::CreateNodeTypeData(LPSTGMEDIUM lpMedium)
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{
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// Create the node type object in GUID format
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return Create(reinterpret_cast<const void*>(&cNodeType), sizeof(GUID), lpMedium);
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}
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HRESULT CDataObject::CreateNodeTypeStringData(LPSTGMEDIUM lpMedium)
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{
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// Create the node type object in GUID string format
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return Create(cszNodeType, ((wcslen(cszNodeType)+1) * sizeof(wchar_t)), lpMedium);
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}
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HRESULT CDataObject::CreateDisplayName(LPSTGMEDIUM lpMedium)
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{
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// This is the display named used in the scope pane and snap-in manager
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// Load the name from resource
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// Note - if this is not provided, the console will used the snap-in name
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CString szDispName;
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szDispName.LoadString(IDS_NODENAME);
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return Create(szDispName, ((szDispName.GetLength()+1) * sizeof(wchar_t)), lpMedium);
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}
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HRESULT CDataObject::CreateCoClassID(LPSTGMEDIUM lpMedium)
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{
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// Create the CoClass information
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if (m_fMachine)
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return Create((LPVOID)&CLSID_MachineSnapin, sizeof(CLSID), lpMedium);
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else
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return Create((LPVOID)&CLSID_Snapin, sizeof(CLSID), lpMedium);
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}
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HRESULT CDataObject::CreateInternal(LPSTGMEDIUM lpMedium)
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{
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return Create(&m_internal, sizeof(INTERNAL), lpMedium);
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}
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