script.c

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/* IDirectMusicScript
 *
 * Copyright (C) 2003-2004 Rok Mandeljc
 * Copyright (C) 2003-2004 Raphael Junqueira
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
 
#include <stdio.h>
 
#include "dmscript_private.h"
#include "dmobject.h"
 
WINE_DEFAULT_DEBUG_CHANNEL(dmscript);
WINE_DECLARE_DEBUG_CHANNEL(dmfile);
 
 
/*****************************************************************************
 * IDirectMusicScriptImpl implementation
 */
typedef struct IDirectMusicScriptImpl {
    IDirectMusicScript IDirectMusicScript_iface;
    struct dmobject dmobj;
    LONG ref;
    IDirectMusicPerformance *pPerformance;
    DMUS_IO_SCRIPT_HEADER *pHeader;
    DMUS_IO_VERSION *pVersion;
    WCHAR *pwzLanguage;
    WCHAR *pwzSource;
} IDirectMusicScriptImpl;
 
static inline IDirectMusicScriptImpl *impl_from_IDirectMusicScript(IDirectMusicScript *iface)
{
  return CONTAINING_RECORD(iface, IDirectMusicScriptImpl, IDirectMusicScript_iface);
}
 
static HRESULT WINAPI IDirectMusicScriptImpl_QueryInterface(IDirectMusicScript *iface, REFIID riid,
        void **ret_iface)
{
    IDirectMusicScriptImpl *This = impl_from_IDirectMusicScript(iface);
 
    TRACE("(%p, %s, %p)\n", This, debugstr_dmguid(riid), ret_iface);
 
    *ret_iface = NULL;
 
    if (IsEqualIID(riid, &IID_IUnknown) || IsEqualIID(riid, &IID_IDirectMusicScript))
        *ret_iface = iface;
    else if (IsEqualIID(riid, &IID_IDirectMusicObject))
        *ret_iface = &This->dmobj.IDirectMusicObject_iface;
    else if (IsEqualIID(riid, &IID_IPersistStream))
        *ret_iface = &This->dmobj.IPersistStream_iface;
    else {
        WARN("(%p, %s, %p): not found\n", This, debugstr_dmguid(riid), ret_iface);
        return E_NOINTERFACE;
    }
 
    IUnknown_AddRef((IUnknown*)*ret_iface);
    return S_OK;
}
 
static ULONG WINAPI IDirectMusicScriptImpl_AddRef(IDirectMusicScript *iface)
{
    IDirectMusicScriptImpl *This = impl_from_IDirectMusicScript(iface);
    LONG ref = InterlockedIncrement(&This->ref);
 
    TRACE("(%p) ref=%ld\n", This, ref);
 
    return ref;
}
 
static ULONG WINAPI IDirectMusicScriptImpl_Release(IDirectMusicScript *iface)
{
    IDirectMusicScriptImpl *This = impl_from_IDirectMusicScript(iface);
    LONG ref = InterlockedDecrement(&This->ref);
 
    TRACE("(%p) ref=%ld\n", This, ref);
 
    if (!ref) {
        free(This->pHeader);
        free(This->pVersion);
        free(This->pwzLanguage);
        free(This->pwzSource);
        free(This);
    }
 
    return ref;
}
 
static HRESULT WINAPI IDirectMusicScriptImpl_Init(IDirectMusicScript *iface,
        IDirectMusicPerformance *pPerformance, DMUS_SCRIPT_ERRORINFO *pErrorInfo)
{
  IDirectMusicScriptImpl *This = impl_from_IDirectMusicScript(iface);
  FIXME("(%p, %p, %p): stub\n", This, pPerformance, pErrorInfo);
  This->pPerformance = pPerformance;
  return S_OK;
}
 
static HRESULT WINAPI IDirectMusicScriptImpl_CallRoutine(IDirectMusicScript *iface,
        WCHAR *pwszRoutineName, DMUS_SCRIPT_ERRORINFO *pErrorInfo)
{
  IDirectMusicScriptImpl *This = impl_from_IDirectMusicScript(iface);
  FIXME("(%p, %s, %p): stub\n", This, debugstr_w(pwszRoutineName), pErrorInfo);
  /*return E_NOTIMPL;*/
  return S_OK;
  /*return E_FAIL;*/
}
 
static HRESULT WINAPI IDirectMusicScriptImpl_SetVariableVariant(IDirectMusicScript *iface,
        WCHAR *pwszVariableName, VARIANT varValue, BOOL fSetRef, DMUS_SCRIPT_ERRORINFO *pErrorInfo)
{
  IDirectMusicScriptImpl *This = impl_from_IDirectMusicScript(iface);
  FIXME("(%p, %s, FIXME, %d, %p): stub\n", This, debugstr_w(pwszVariableName),/* varValue,*/ fSetRef, pErrorInfo);
  return S_OK;
}
 
static HRESULT WINAPI IDirectMusicScriptImpl_GetVariableVariant(IDirectMusicScript *iface,
        WCHAR *pwszVariableName, VARIANT *pvarValue, DMUS_SCRIPT_ERRORINFO *pErrorInfo)
{
  IDirectMusicScriptImpl *This = impl_from_IDirectMusicScript(iface);
  FIXME("(%p, %s, %p, %p): stub\n", This, debugstr_w(pwszVariableName), pvarValue, pErrorInfo);
  return S_OK;
}
 
static HRESULT WINAPI IDirectMusicScriptImpl_SetVariableNumber(IDirectMusicScript *iface,
        WCHAR *pwszVariableName, LONG lValue, DMUS_SCRIPT_ERRORINFO *pErrorInfo)
{
  IDirectMusicScriptImpl *This = impl_from_IDirectMusicScript(iface);
  FIXME("(%p, %s, %li, %p): stub\n", This, debugstr_w(pwszVariableName), lValue, pErrorInfo);
  return S_OK;
}
 
static HRESULT WINAPI IDirectMusicScriptImpl_GetVariableNumber(IDirectMusicScript *iface,
        WCHAR *pwszVariableName, LONG *plValue, DMUS_SCRIPT_ERRORINFO *pErrorInfo)
{
  IDirectMusicScriptImpl *This = impl_from_IDirectMusicScript(iface);
  FIXME("(%p, %s, %p, %p): stub\n", This, debugstr_w(pwszVariableName), plValue, pErrorInfo);
  return S_OK;
}
 
static HRESULT WINAPI IDirectMusicScriptImpl_SetVariableObject(IDirectMusicScript *iface,
        WCHAR *pwszVariableName, IUnknown *punkValue, DMUS_SCRIPT_ERRORINFO *pErrorInfo)
{
  IDirectMusicScriptImpl *This = impl_from_IDirectMusicScript(iface);
  FIXME("(%p, %s, %p, %p): stub\n", This, debugstr_w(pwszVariableName), punkValue, pErrorInfo);
  return S_OK;
}
 
static HRESULT WINAPI IDirectMusicScriptImpl_GetVariableObject(IDirectMusicScript *iface,
        WCHAR *pwszVariableName, REFIID riid, void **ppv, DMUS_SCRIPT_ERRORINFO *pErrorInfo)
{
  IDirectMusicScriptImpl *This = impl_from_IDirectMusicScript(iface);
  FIXME("(%p, %s, %s, %p, %p): stub\n", This, debugstr_w(pwszVariableName), debugstr_dmguid(riid), ppv, pErrorInfo);
  return S_OK;
}
 
static HRESULT WINAPI IDirectMusicScriptImpl_EnumRoutine(IDirectMusicScript *iface, DWORD dwIndex,
        WCHAR *pwszName)
{
  IDirectMusicScriptImpl *This = impl_from_IDirectMusicScript(iface);
  FIXME("(%p, %ld, %p): stub\n", This, dwIndex, pwszName);
  return S_OK;
}
 
static HRESULT WINAPI IDirectMusicScriptImpl_EnumVariable(IDirectMusicScript *iface, DWORD dwIndex,
        WCHAR *pwszName)
{
  IDirectMusicScriptImpl *This = impl_from_IDirectMusicScript(iface);
  FIXME("(%p, %ld, %p): stub\n", This, dwIndex, pwszName);
  return S_OK;
}
 
static const IDirectMusicScriptVtbl dmscript_vtbl = {
    IDirectMusicScriptImpl_QueryInterface,
    IDirectMusicScriptImpl_AddRef,
    IDirectMusicScriptImpl_Release,
    IDirectMusicScriptImpl_Init,
    IDirectMusicScriptImpl_CallRoutine,
    IDirectMusicScriptImpl_SetVariableVariant,
    IDirectMusicScriptImpl_GetVariableVariant,
    IDirectMusicScriptImpl_SetVariableNumber,
    IDirectMusicScriptImpl_GetVariableNumber,
    IDirectMusicScriptImpl_SetVariableObject,
    IDirectMusicScriptImpl_GetVariableObject,
    IDirectMusicScriptImpl_EnumRoutine,
    IDirectMusicScriptImpl_EnumVariable
};
 
static HRESULT WINAPI script_IDirectMusicObject_ParseDescriptor(IDirectMusicObject *iface,
        IStream *stream, DMUS_OBJECTDESC *desc)
{
    struct chunk_entry riff = {0};
    HRESULT hr;
 
    TRACE("(%p, %p, %p)\n", iface, stream, desc);
 
    if (!stream || !desc)
        return E_POINTER;
 
     if ((hr = stream_get_chunk(stream, &riff)) != S_OK)
        return hr;
    if (riff.id != FOURCC_RIFF || riff.type != DMUS_FOURCC_SCRIPT_FORM) {
        TRACE("loading failed: unexpected %s\n", debugstr_chunk(&riff));
        stream_skip_chunk(stream, &riff);
        return DMUS_E_SCRIPT_INVALID_FILE;
    }
 
    hr = dmobj_parsedescriptor(stream, &riff, desc,
            DMUS_OBJ_OBJECT|DMUS_OBJ_NAME|DMUS_OBJ_NAME_INAM|DMUS_OBJ_CATEGORY|DMUS_OBJ_VERSION);
    if (FAILED(hr))
        return hr;
 
    if (desc->dwValidData) {
        desc->guidClass = CLSID_DirectMusicScript;
        desc->dwValidData |= DMUS_OBJ_CLASS;
    }
 
    TRACE("returning descriptor:\n");
    dump_DMUS_OBJECTDESC(desc);
    return S_OK;
}
 
static const IDirectMusicObjectVtbl dmobject_vtbl = {
    dmobj_IDirectMusicObject_QueryInterface,
    dmobj_IDirectMusicObject_AddRef,
    dmobj_IDirectMusicObject_Release,
    dmobj_IDirectMusicObject_GetDescriptor,
    dmobj_IDirectMusicObject_SetDescriptor,
    script_IDirectMusicObject_ParseDescriptor
};
 
/* IDirectMusicScriptImpl IPersistStream part: */
static inline IDirectMusicScriptImpl *impl_from_IPersistStream(IPersistStream *iface)
{
    return CONTAINING_RECORD(iface, IDirectMusicScriptImpl, dmobj.IPersistStream_iface);
}
 
static HRESULT WINAPI IPersistStreamImpl_Load(IPersistStream *iface, IStream *pStm)
{
        IDirectMusicScriptImpl *This = impl_from_IPersistStream(iface);
    DMUS_PRIVATE_CHUNK Chunk;
    DWORD StreamSize, StreamCount, ListSize[3], ListCount[3];
    LARGE_INTEGER liMove; /* used when skipping chunks */
    LPDIRECTMUSICGETLOADER pGetLoader = NULL;
    LPDIRECTMUSICLOADER pLoader = NULL;
 
    FIXME("(%p, %p): Loading not implemented yet\n", This, pStm);
    IStream_Read (pStm, &Chunk, sizeof(FOURCC)+sizeof(DWORD), NULL);
    TRACE_(dmfile)(": %s chunk (size = %ld)", debugstr_fourcc (Chunk.fccID), Chunk.dwSize);
    switch (Chunk.fccID) {  
        case FOURCC_RIFF: {
            IStream_Read (pStm, &Chunk.fccID, sizeof(FOURCC), NULL);                
            TRACE_(dmfile)(": RIFF chunk of type %s", debugstr_fourcc(Chunk.fccID));
            StreamSize = Chunk.dwSize - sizeof(FOURCC);
            StreamCount = 0;
            switch (Chunk.fccID) {
                case DMUS_FOURCC_SCRIPT_FORM: {
                    TRACE_(dmfile)(": script form\n");
                    do {
                        IStream_Read (pStm, &Chunk, sizeof(FOURCC)+sizeof(DWORD), NULL);
                        StreamCount += sizeof(FOURCC) + sizeof(DWORD) + Chunk.dwSize;
                        TRACE_(dmfile)(": %s chunk (size = %ld)", debugstr_fourcc (Chunk.fccID), Chunk.dwSize);
                        switch (Chunk.fccID) { 
                                case DMUS_FOURCC_SCRIPT_CHUNK: {
                                    TRACE_(dmfile)(": script header chunk\n");
                                This->pHeader = calloc(1, Chunk.dwSize);
                                IStream_Read (pStm, This->pHeader, Chunk.dwSize, NULL);
                                break;
                                }
                                case DMUS_FOURCC_SCRIPTVERSION_CHUNK: {
                                    TRACE_(dmfile)(": script version chunk\n");
                                This->pVersion = calloc(1, Chunk.dwSize);
                                IStream_Read (pStm, This->pVersion, Chunk.dwSize, NULL); 
                                TRACE_(dmfile)("version: 0x%08lx.0x%08lx\n", This->pVersion->dwVersionMS, This->pVersion->dwVersionLS);
                                break;
                                }
                                case DMUS_FOURCC_SCRIPTLANGUAGE_CHUNK: {
                                    TRACE_(dmfile)(": script language chunk\n");
                                This->pwzLanguage = calloc(1, Chunk.dwSize);
                                IStream_Read (pStm, This->pwzLanguage, Chunk.dwSize, NULL); 
                                TRACE_(dmfile)("using language: %s\n", debugstr_w(This->pwzLanguage));
                                break;
                                }
                                case DMUS_FOURCC_SCRIPTSOURCE_CHUNK: {
                                    TRACE_(dmfile)(": script source chunk\n");
                                This->pwzSource = calloc(1, Chunk.dwSize);
                                IStream_Read (pStm, This->pwzSource, Chunk.dwSize, NULL); 
                                if (TRACE_ON(dmscript)) {
                                    int count = WideCharToMultiByte(CP_ACP, 0, This->pwzSource, -1, NULL, 0, NULL, NULL);
                                    LPSTR str = malloc(count);
                                    WideCharToMultiByte(CP_ACP, 0, This->pwzSource, -1, str, count, NULL, NULL);
                                    str[count-1] = '\n';
                                    TRACE("source:\n");
                                    fwrite( str, 1, count, stderr );
                                    free(str);
                                }
                                break;
                                }
                            case DMUS_FOURCC_GUID_CHUNK: {
                                TRACE_(dmfile)(": GUID chunk\n");
                                This->dmobj.desc.dwValidData |= DMUS_OBJ_OBJECT;
                                IStream_Read (pStm, &This->dmobj.desc.guidObject, Chunk.dwSize, NULL);
                                break;
                            }
                            case DMUS_FOURCC_VERSION_CHUNK: {
                                TRACE_(dmfile)(": version chunk\n");
                                This->dmobj.desc.dwValidData |= DMUS_OBJ_VERSION;
                                IStream_Read (pStm, &This->dmobj.desc.vVersion, Chunk.dwSize, NULL);
                                break;
                            }
                            case DMUS_FOURCC_CATEGORY_CHUNK: {
                                TRACE_(dmfile)(": category chunk\n");
                                This->dmobj.desc.dwValidData |= DMUS_OBJ_CATEGORY;
                                IStream_Read (pStm, This->dmobj.desc.wszCategory, Chunk.dwSize, NULL);
                                break;
                            }
                                case FOURCC_RIFF: {
                                IDirectMusicObject* pObject = NULL;
                                DMUS_OBJECTDESC desc;
 
                                ZeroMemory (&desc, sizeof(DMUS_OBJECTDESC));
                                desc.dwSize = sizeof(DMUS_OBJECTDESC);
                                desc.dwValidData = DMUS_OBJ_STREAM | DMUS_OBJ_CLASS;
                                desc.guidClass = CLSID_DirectMusicContainer;
                                desc.pStream = NULL;
                                IStream_Clone (pStm, &desc.pStream);
 
                                liMove.QuadPart = 0;
                                liMove.QuadPart -= (sizeof(FOURCC) + sizeof(DWORD));
                                IStream_Seek (desc.pStream, liMove, STREAM_SEEK_CUR, NULL);
 
                                IStream_QueryInterface (pStm, &IID_IDirectMusicGetLoader, (LPVOID*)&pGetLoader);
                                IDirectMusicGetLoader_GetLoader (pGetLoader, &pLoader);
                                IDirectMusicGetLoader_Release (pGetLoader);
 
                                if (SUCCEEDED(IDirectMusicLoader_GetObject (pLoader, &desc, &IID_IDirectMusicObject, (LPVOID*) &pObject))) {
                                  IDirectMusicObject_Release (pObject);
                                } else {
                                  ERR_(dmfile)("Error on GetObject while trying to load Scrip SubContainer\n");
                                }
 
                                IDirectMusicLoader_Release (pLoader); pLoader = NULL; /* release loader */
                                IStream_Release(desc.pStream); desc.pStream = NULL; /* release cloned stream */
 
                                liMove.QuadPart = Chunk.dwSize;
                                IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
                                /*
                                    IStream_Read (pStm, &Chunk.fccID, sizeof(FOURCC), NULL);                
                                TRACE_(dmfile)(": RIFF chunk of type %s", debugstr_fourcc(Chunk.fccID));
                                ListSize[0] = Chunk.dwSize - sizeof(FOURCC);
                                ListCount[0] = 0;
 
                                switch (Chunk.fccID) {
                                        default: {
                                        TRACE_(dmfile)(": unknown (skipping)\n");
                                        liMove.QuadPart = Chunk.dwSize - sizeof(FOURCC);
                                        IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
                                        break;                      
                                    }
                                }
                                */
                                break;
                            }
                            case FOURCC_LIST: {
                                IStream_Read (pStm, &Chunk.fccID, sizeof(FOURCC), NULL);                
                                TRACE_(dmfile)(": LIST chunk of type %s", debugstr_fourcc(Chunk.fccID));
                                ListSize[0] = Chunk.dwSize - sizeof(FOURCC);
                                ListCount[0] = 0;
                                switch (Chunk.fccID) {
                                    case DMUS_FOURCC_UNFO_LIST: {
                                        TRACE_(dmfile)(": UNFO list\n");
                                        do {
                                            IStream_Read (pStm, &Chunk, sizeof(FOURCC)+sizeof(DWORD), NULL);
                                            ListCount[0] += sizeof(FOURCC) + sizeof(DWORD) + Chunk.dwSize;
                                            TRACE_(dmfile)(": %s chunk (size = %ld)", debugstr_fourcc (Chunk.fccID), Chunk.dwSize);
                                            switch (Chunk.fccID) {
                                                /* don't ask me why, but M$ puts INFO elements in UNFO list sometimes
                                              (though strings seem to be valid unicode) */
                                                case mmioFOURCC('I','N','A','M'):
                                                case DMUS_FOURCC_UNAM_CHUNK: {
                                                    TRACE_(dmfile)(": name chunk\n");
                                                    This->dmobj.desc.dwValidData |= DMUS_OBJ_NAME;
                                                    IStream_Read (pStm, This->dmobj.desc.wszName, Chunk.dwSize, NULL);
                                                    break;
                                                }
                                                case mmioFOURCC('I','A','R','T'):
                                                case DMUS_FOURCC_UART_CHUNK: {
                                                    TRACE_(dmfile)(": artist chunk (ignored)\n");
                                                    liMove.QuadPart = Chunk.dwSize;
                                                    IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
                                                    break;
                                                }
                                                case mmioFOURCC('I','C','O','P'):
                                                case DMUS_FOURCC_UCOP_CHUNK: {
                                                    TRACE_(dmfile)(": copyright chunk (ignored)\n");
                                                    liMove.QuadPart = Chunk.dwSize;
                                                    IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
                                                    break;
                                                }
                                                case mmioFOURCC('I','S','B','J'):
                                                case DMUS_FOURCC_USBJ_CHUNK: {
                                                    TRACE_(dmfile)(": subject chunk (ignored)\n");
                                                    liMove.QuadPart = Chunk.dwSize;
                                                    IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
                                                    break;
                                                }
                                                case mmioFOURCC('I','C','M','T'):
                                                case DMUS_FOURCC_UCMT_CHUNK: {
                                                    TRACE_(dmfile)(": comment chunk (ignored)\n");
                                                    liMove.QuadPart = Chunk.dwSize;
                                                    IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
                                                    break;
                                                }
                                                default: {
                                                    TRACE_(dmfile)(": unknown sub-chunk (irrelevant & skipping)\n");
                                                    liMove.QuadPart = Chunk.dwSize;
                                                    IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
                                                    break;                      
                                                }
                                            }
                                            TRACE_(dmfile)(": ListCount[0] = %ld < ListSize[0] = %ld\n", ListCount[0], ListSize[0]);
                                        } while (ListCount[0] < ListSize[0]);
                                        break;
                                    }
                                    default: {
                                        TRACE_(dmfile)(": unknown (skipping)\n");
                                        liMove.QuadPart = Chunk.dwSize - sizeof(FOURCC);
                                        IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
                                        break;                      
                                    }
                                }
                                break;
                            }   
                            default: {
                                TRACE_(dmfile)(": unknown chunk (irrelevant & skipping)\n");
                                liMove.QuadPart = Chunk.dwSize;
                                IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
                                break;                      
                            }
                        }
                        TRACE_(dmfile)(": StreamCount[0] = %ld < StreamSize[0] = %ld\n", StreamCount, StreamSize);
                    } while (StreamCount < StreamSize);
                    break;
                }
                default: {
                    TRACE_(dmfile)(": unexpected chunk; loading failed)\n");
                    liMove.QuadPart = StreamSize;
                    IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL); /* skip the rest of the chunk */
                    return E_FAIL;
                }
            }
            TRACE_(dmfile)(": reading finished\n");
            break;
        }
        default: {
            TRACE_(dmfile)(": unexpected chunk; loading failed)\n");
            liMove.QuadPart = Chunk.dwSize;
            IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL); /* skip the rest of the chunk */
            return E_FAIL;
        }
    }
 
    return S_OK;
}
 
static const IPersistStreamVtbl persiststream_vtbl = {
    dmobj_IPersistStream_QueryInterface,
    dmobj_IPersistStream_AddRef,
    dmobj_IPersistStream_Release,
    unimpl_IPersistStream_GetClassID,
    unimpl_IPersistStream_IsDirty,
    IPersistStreamImpl_Load,
    unimpl_IPersistStream_Save,
    unimpl_IPersistStream_GetSizeMax
};
 
/* for ClassFactory */
HRESULT DMUSIC_CreateDirectMusicScriptImpl(REFIID lpcGUID, void **ppobj, IUnknown *pUnkOuter)
{
  IDirectMusicScriptImpl *obj;
  HRESULT hr;
 
  *ppobj = NULL;
 
  if (pUnkOuter)
    return CLASS_E_NOAGGREGATION;
 
  if (!(obj = calloc(1, sizeof(*obj)))) return E_OUTOFMEMORY;
  obj->IDirectMusicScript_iface.lpVtbl = &dmscript_vtbl;
  obj->ref = 1;
  dmobject_init(&obj->dmobj, &CLSID_DirectMusicScript, (IUnknown*)&obj->IDirectMusicScript_iface);
  obj->dmobj.IDirectMusicObject_iface.lpVtbl = &dmobject_vtbl;
  obj->dmobj.IPersistStream_iface.lpVtbl = &persiststream_vtbl;
 
  hr = IDirectMusicScript_QueryInterface(&obj->IDirectMusicScript_iface, lpcGUID, ppobj);
  IDirectMusicScript_Release(&obj->IDirectMusicScript_iface);
 
  return hr;
}