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DataObject.cpp
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// 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) Microsoft Corporation. All rights reserved
//
// Sample data object implementation that demonstrates how to leverage the
// shell provided data object for the SetData() support
#include <windows.h>
#include <shlwapi.h>
#include <strsafe.h>
#include <shlobj.h>
#include <new> // std::nothrow
#include "shellhelpers.h"
void DllAddRef() {} // implement these if this is used in a DLL
void DllRelease() {}
class CDataObject : public IDataObject
{
public:
CDataObject() : _cRef(1), _pdtobjShell(NULL)
{
DllAddRef();
}
// IUnknown
IFACEMETHODIMP QueryInterface(REFIID riid, void **ppv)
{
static const QITAB qit[] = {
QITABENT(CDataObject, IDataObject),
{ 0},
};
return QISearch(this, qit, riid, ppv);
}
IFACEMETHODIMP_(ULONG) AddRef()
{
return InterlockedIncrement(&_cRef);
}
IFACEMETHODIMP_(ULONG) Release()
{
long cRef = InterlockedDecrement(&_cRef);
if (0 == cRef)
{
delete this;
}
return cRef;
}
// IDataObject
IFACEMETHODIMP GetData(FORMATETC *pformatetcIn, STGMEDIUM *pmedium);
IFACEMETHODIMP GetDataHere(FORMATETC* /* pformatetc */, STGMEDIUM* /* pmedium */)
{
return E_NOTIMPL;
}
IFACEMETHODIMP QueryGetData(FORMATETC *pformatetc);
IFACEMETHODIMP GetCanonicalFormatEtc(FORMATETC *pformatetcIn, FORMATETC *pFormatetcOut)
{
*pFormatetcOut = *pformatetcIn;
pFormatetcOut->ptd = NULL;
return DATA_S_SAMEFORMATETC;
}
IFACEMETHODIMP SetData(FORMATETC *pformatetc, STGMEDIUM *pmedium, BOOL fRelease);
IFACEMETHODIMP EnumFormatEtc(DWORD dwDirection, IEnumFORMATETC **ppenumFormatEtc);
IFACEMETHODIMP DAdvise(FORMATETC* /* pformatetc */, DWORD /* advf */, IAdviseSink* /* pAdvSnk */, DWORD* /* pdwConnection */)
{
return E_NOTIMPL;
}
IFACEMETHODIMP DUnadvise(DWORD /* dwConnection */)
{
return E_NOTIMPL;
}
IFACEMETHODIMP EnumDAdvise(IEnumSTATDATA** /* ppenumAdvise */)
{
return E_NOTIMPL;
}
private:
~CDataObject()
{
SafeRelease(&_pdtobjShell);
DllRelease();
}
HRESULT _EnsureShellDataObject()
{
// the shell data object imptlements ::SetData() in a way that will store any format
// this code delegates to that implementation to avoid having to implement ::SetData()
return _pdtobjShell ? S_OK : SHCreateDataObject(NULL, 0, NULL, NULL, IID_PPV_ARGS(&_pdtobjShell));
}
long _cRef;
IDataObject *_pdtobjShell;
};
WCHAR const c_szText[] = L"Clipboard Contents";
STDMETHODIMP CDataObject::GetData(FORMATETC *pformatetcIn, STGMEDIUM *pmedium)
{
ZeroMemory(pmedium, sizeof(*pmedium));
HRESULT hr = DATA_E_FORMATETC;
if (pformatetcIn->cfFormat == CF_UNICODETEXT)
{
if (pformatetcIn->tymed & TYMED_HGLOBAL)
{
UINT cb = sizeof(c_szText[0]) * (lstrlen(c_szText) + 1);
HGLOBAL h = GlobalAlloc(GPTR, cb);
hr = h ? S_OK : E_OUTOFMEMORY;
if (SUCCEEDED(hr))
{
StringCbCopy((PWSTR)h, cb, c_szText);
pmedium->hGlobal = h;
pmedium->tymed = TYMED_HGLOBAL;
}
}
}
else if (SUCCEEDED(_EnsureShellDataObject()))
{
hr = _pdtobjShell->GetData(pformatetcIn, pmedium);
}
return hr;
}
IFACEMETHODIMP CDataObject::SetData(FORMATETC *pformatetc, STGMEDIUM *pmedium, BOOL fRelease)
{
HRESULT hr = _EnsureShellDataObject();
if (SUCCEEDED(hr))
{
hr = _pdtobjShell->SetData(pformatetc, pmedium, fRelease);
}
return hr;
}
STDMETHODIMP CDataObject::QueryGetData(FORMATETC *pformatetc)
{
HRESULT hr = S_FALSE;
if (pformatetc->cfFormat == CF_UNICODETEXT)
{
hr = S_OK;
}
else if (SUCCEEDED(_EnsureShellDataObject()))
{
hr = _pdtobjShell->QueryGetData(pformatetc);
}
return hr;
}
STDMETHODIMP CDataObject::EnumFormatEtc(DWORD dwDirection, IEnumFORMATETC **ppenumFormatEtc)
{
*ppenumFormatEtc = NULL;
HRESULT hr = E_NOTIMPL;
if (dwDirection == DATADIR_GET)
{
FORMATETC rgfmtetc[] =
{
// the order here defines the accuarcy of rendering
{ CF_UNICODETEXT, NULL, 0, 0, TYMED_HGLOBAL },
};
hr = SHCreateStdEnumFmtEtc(ARRAYSIZE(rgfmtetc), rgfmtetc, ppenumFormatEtc);
}
return hr;
}
STDAPI CDataObject_CreateInstance(REFIID riid, void **ppv)
{
*ppv = NULL;
CDataObject *p = new (std::nothrow) CDataObject();
HRESULT hr = p ? S_OK : E_OUTOFMEMORY;
if (SUCCEEDED(hr))
{
hr = p->QueryInterface(riid, ppv);
p->Release();
}
return hr;
}