ciderpress/util/ImageDataObject.h

// ImageDataObject.h: Impementation for IDataObject Interface to be used 
//                       in inserting bitmap to the RichEdit Control.
//
// Author : Hani Atassi  (atassi@arabteam2000.com)
//
// How to use : Just call the static member InsertBitmap with 
//              the appropriate parrameters. 
//
// Known bugs :
//
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_IMAGEDATAOBJECT_H__7E162227_62B8_49E3_A35B_FEC3F241A78F__INCLUDED_)
#define AFX_IMAGEDATAOBJECT_H__7E162227_62B8_49E3_A35B_FEC3F241A78F__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#include <afxole.h>
#include <richole.h>

class CImageDataObject : IDataObject
{
public:
    // This static fumction accepts those parameters:
    // IRichEditOle* : a pointer to IRochEditOle interface for the RichEdit Control
    // HBITMAP : the bitmap handle.
    //
    // After calling the function, it inserts the image in the current 
    //    position of the RichEdit
    //
    static void InsertBitmap(IRichEditOle* pRichEditOle, HBITMAP hBitmap);

private:
    ULONG   m_ulRefCnt;
    BOOL    m_bRelease;

    // The data being bassed to the richedit
    //
    STGMEDIUM m_stgmed;
    FORMATETC m_fromat;

public:
    CImageDataObject() : m_ulRefCnt(0)
    {
        m_bRelease = FALSE;
    }

    ~CImageDataObject()
    {
        if (m_bRelease)
            ::ReleaseStgMedium(&m_stgmed);
    }

    // Methods of the IUnknown interface
    // 
    STDMETHOD(QueryInterface)(REFIID iid, void ** ppvObject)
    {
        if (iid == IID_IUnknown || iid == IID_IDataObject)
        {
            *ppvObject = this;
            AddRef();
            return S_OK;
        }
        else
            return E_NOINTERFACE;
    }
    STDMETHOD_(ULONG, AddRef)(void)
    {
        m_ulRefCnt++;
        return m_ulRefCnt;
    }
    STDMETHOD_(ULONG, Release)(void)
    {
        if (--m_ulRefCnt == 0)
        {
            delete this;
            return 0;
        }

        return m_ulRefCnt;
    }

    // Methods of the IDataObject Interface
    //
    STDMETHOD(GetData)(FORMATETC* /*pformatetcIn*/, STGMEDIUM* pmedium) {
        HANDLE hDst;
        hDst = ::OleDuplicateData(m_stgmed.hBitmap, CF_BITMAP, NULL);
        if (hDst == NULL)
        {
            return E_HANDLE;
        }

        pmedium->tymed = TYMED_GDI;
        pmedium->hBitmap = (HBITMAP)hDst;
        pmedium->pUnkForRelease = NULL;

        return S_OK;
    }
    STDMETHOD(GetDataHere)(FORMATETC* /*pformatetc*/, STGMEDIUM*  pmedium ) {
        return E_NOTIMPL;
    }
    STDMETHOD(QueryGetData)(FORMATETC* /*pformatetc*/ ) {
        return E_NOTIMPL;
    }
    STDMETHOD(GetCanonicalFormatEtc)(FORMATETC* /*pformatectIn*/, FORMATETC* /*pformatetcOut*/) {
        return E_NOTIMPL;
    }
    STDMETHOD(SetData)(FORMATETC* pformatetc , STGMEDIUM*  pmedium , BOOL  fRelease ) {
        m_fromat = *pformatetc;
        m_stgmed = *pmedium;

        return S_OK;
    }
    STDMETHOD(EnumFormatEtc)(DWORD  dwDirection , IEnumFORMATETC**  ppenumFormatEtc ) {
        return E_NOTIMPL;
    }
    STDMETHOD(DAdvise)(FORMATETC* /*pformatetc*/, DWORD /*advf*/, IAdviseSink* /*pAdvSink*/,
        DWORD* /*pdwConnection*/) {
        return E_NOTIMPL;
    }
    STDMETHOD(DUnadvise)(DWORD /*dwConnection*/) {
        return E_NOTIMPL;
    }
    STDMETHOD(EnumDAdvise)(IEnumSTATDATA** /*ppenumAdvise*/) {
        return E_NOTIMPL;
    }

    // Some Other helper functions
    //
    void SetBitmap(HBITMAP hBitmap);
    IOleObject *GetOleObject(IOleClientSite *pOleClientSite, IStorage *pStorage);

};

#endif // !defined(AFX_IMAGEDATAOBJECT_H__7E162227_62B8_49E3_A35B_FEC3F241A78F__INCLUDED_)