src/msw/ole/dataobj.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        msw/ole/dataobj.cpp
   3 // Purpose:     implementation of wx[I]DataObject class
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     10.05.98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 // For compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #if defined(__BORLANDC__)
  24     #pragma hdrstop
  25 #endif
  26
  27 #ifndef WX_PRECOMP
  28     #include "wx/intl.h"
  29     #include "wx/log.h"
  30 #endif
  31
  32 #include "wx/dataobj.h"
  33
  34 #if wxUSE_OLE && defined(__WIN32__) && !defined(__GNUWIN32_OLD__)
  35
  36 #include "wx/msw/private.h"         // includes <windows.h>
  37
  38 #ifdef __WXWINCE__
  39 #include <winreg.h>
  40 #endif
  41
  42 // for some compilers, the entire ole2.h must be included, not only oleauto.h
  43 #if wxUSE_NORLANDER_HEADERS || defined(__WATCOMC__) || defined(__WXWINCE__)
  44   #include <ole2.h>
  45 #endif
  46
  47 #include <oleauto.h>
  48 #include <shlobj.h>
  49
  50 #include "wx/msw/ole/oleutils.h"
  51
  52 #include "wx/msw/dib.h"
  53
  54 #ifndef CFSTR_SHELLURL
  55 #define CFSTR_SHELLURL _T("UniformResourceLocator")
  56 #endif
  57
  58 // ----------------------------------------------------------------------------
  59 // functions
  60 // ----------------------------------------------------------------------------
  61
  62 #ifdef __WXDEBUG__
  63     static const wxChar *GetTymedName(DWORD tymed);
  64 #else // !Debug
  65     #define GetTymedName(tymed) wxEmptyString
  66 #endif // Debug/!Debug
  67
  68 // ----------------------------------------------------------------------------
  69 // wxIEnumFORMATETC interface implementation
  70 // ----------------------------------------------------------------------------
  71
  72 class wxIEnumFORMATETC : public IEnumFORMATETC
  73 {
  74 public:
  75     wxIEnumFORMATETC(const wxDataFormat* formats, ULONG nCount);
  76     virtual ~wxIEnumFORMATETC() { delete [] m_formats; }
  77
  78     DECLARE_IUNKNOWN_METHODS;
  79
  80     // IEnumFORMATETC
  81     STDMETHODIMP Next(ULONG celt, FORMATETC *rgelt, ULONG *pceltFetched);
  82     STDMETHODIMP Skip(ULONG celt);
  83     STDMETHODIMP Reset();
  84     STDMETHODIMP Clone(IEnumFORMATETC **ppenum);
  85
  86 private:
  87     CLIPFORMAT *m_formats;  // formats we can provide data in
  88     ULONG       m_nCount,   // number of formats we support
  89                 m_nCurrent; // current enum position
  90
  91     DECLARE_NO_COPY_CLASS(wxIEnumFORMATETC)
  92 };
  93
  94 // ----------------------------------------------------------------------------
  95 // wxIDataObject implementation of IDataObject interface
  96 // ----------------------------------------------------------------------------
  97
  98 class wxIDataObject : public IDataObject
  99 {
 100 public:
 101     wxIDataObject(wxDataObject *pDataObject);
 102     virtual ~wxIDataObject();
 103
 104     // normally, wxDataObject controls our lifetime (i.e. we're deleted when it
 105     // is), but in some cases, the situation is reversed, that is we delete it
 106     // when this object is deleted - setting this flag enables such logic
 107     void SetDeleteFlag() { m_mustDelete = true; }
 108
 109     DECLARE_IUNKNOWN_METHODS;
 110
 111     // IDataObject
 112     STDMETHODIMP GetData(FORMATETC *pformatetcIn, STGMEDIUM *pmedium);
 113     STDMETHODIMP GetDataHere(FORMATETC *pformatetc, STGMEDIUM *pmedium);
 114     STDMETHODIMP QueryGetData(FORMATETC *pformatetc);
 115     STDMETHODIMP GetCanonicalFormatEtc(FORMATETC *In, FORMATETC *pOut);
 116     STDMETHODIMP SetData(FORMATETC *pfetc, STGMEDIUM *pmedium, BOOL fRelease);
 117     STDMETHODIMP EnumFormatEtc(DWORD dwDirection, IEnumFORMATETC **ppenumFEtc);
 118     STDMETHODIMP DAdvise(FORMATETC *pfetc, DWORD ad, IAdviseSink *p, DWORD *pdw);
 119     STDMETHODIMP DUnadvise(DWORD dwConnection);
 120     STDMETHODIMP EnumDAdvise(IEnumSTATDATA **ppenumAdvise);
 121
 122 private:
 123     wxDataObject *m_pDataObject;      // pointer to C++ class we belong to
 124
 125     bool m_mustDelete;
 126
 127     DECLARE_NO_COPY_CLASS(wxIDataObject)
 128 };
 129
 130 // ============================================================================
 131 // implementation
 132 // ============================================================================
 133
 134 // ----------------------------------------------------------------------------
 135 // wxDataFormat
 136 // ----------------------------------------------------------------------------
 137
 138 void wxDataFormat::SetId(const wxChar *format)
 139 {
 140     m_format = (wxDataFormat::NativeFormat)::RegisterClipboardFormat(format);
 141     if ( !m_format )
 142     {
 143         wxLogError(_("Couldn't register clipboard format '%s'."), format);
 144     }
 145 }
 146
 147 wxString wxDataFormat::GetId() const
 148 {
 149     static const int max = 256;
 150
 151     wxString s;
 152
 153     wxCHECK_MSG( !IsStandard(), s,
 154                  wxT("name of predefined format cannot be retrieved") );
 155
 156     int len = ::GetClipboardFormatName(m_format, wxStringBuffer(s, max), max);
 157
 158     if ( !len )
 159     {
 160         wxLogError(_("The clipboard format '%d' doesn't exist."), m_format);
 161     }
 162
 163     return s;
 164 }
 165
 166 // ----------------------------------------------------------------------------
 167 // wxIEnumFORMATETC
 168 // ----------------------------------------------------------------------------
 169
 170 BEGIN_IID_TABLE(wxIEnumFORMATETC)
 171     ADD_IID(Unknown)
 172     ADD_IID(EnumFORMATETC)
 173 END_IID_TABLE;
 174
 175 IMPLEMENT_IUNKNOWN_METHODS(wxIEnumFORMATETC)
 176
 177 wxIEnumFORMATETC::wxIEnumFORMATETC(const wxDataFormat *formats, ULONG nCount)
 178 {
 179     m_nCurrent = 0;
 180     m_nCount = nCount;
 181     m_formats = new CLIPFORMAT[nCount];
 182     for ( ULONG n = 0; n < nCount; n++ ) {
 183         m_formats[n] = formats[n].GetFormatId();
 184     }
 185 }
 186
 187 STDMETHODIMP wxIEnumFORMATETC::Next(ULONG      celt,
 188                                     FORMATETC *rgelt,
 189                                     ULONG     *pceltFetched)
 190 {
 191     wxLogTrace(wxTRACE_OleCalls, wxT("wxIEnumFORMATETC::Next"));
 192
 193     ULONG numFetched = 0;
 194     while (m_nCurrent < m_nCount && numFetched < celt) {
 195         FORMATETC format;
 196         format.cfFormat = m_formats[m_nCurrent++];
 197         format.ptd      = NULL;
 198         format.dwAspect = DVASPECT_CONTENT;
 199         format.lindex   = -1;
 200         format.tymed    = TYMED_HGLOBAL;
 201
 202         *rgelt++ = format;
 203         numFetched++;
 204     }
 205
 206     if (pceltFetched)
 207         *pceltFetched = numFetched;
 208
 209     return numFetched == celt ? S_OK : S_FALSE;
 210 }
 211
 212 STDMETHODIMP wxIEnumFORMATETC::Skip(ULONG celt)
 213 {
 214     wxLogTrace(wxTRACE_OleCalls, wxT("wxIEnumFORMATETC::Skip"));
 215
 216     m_nCurrent += celt;
 217     if ( m_nCurrent < m_nCount )
 218         return S_OK;
 219
 220     // no, can't skip this many elements
 221     m_nCurrent -= celt;
 222
 223     return S_FALSE;
 224 }
 225
 226 STDMETHODIMP wxIEnumFORMATETC::Reset()
 227 {
 228     wxLogTrace(wxTRACE_OleCalls, wxT("wxIEnumFORMATETC::Reset"));
 229
 230     m_nCurrent = 0;
 231
 232     return S_OK;
 233 }
 234
 235 STDMETHODIMP wxIEnumFORMATETC::Clone(IEnumFORMATETC **ppenum)
 236 {
 237     wxLogTrace(wxTRACE_OleCalls, wxT("wxIEnumFORMATETC::Clone"));
 238
 239     // unfortunately, we can't reuse the code in ctor - types are different
 240     wxIEnumFORMATETC *pNew = new wxIEnumFORMATETC(NULL, 0);
 241     pNew->m_nCount = m_nCount;
 242     pNew->m_formats = new CLIPFORMAT[m_nCount];
 243     for ( ULONG n = 0; n < m_nCount; n++ ) {
 244         pNew->m_formats[n] = m_formats[n];
 245     }
 246     pNew->AddRef();
 247     *ppenum = pNew;
 248
 249     return S_OK;
 250 }
 251
 252 // ----------------------------------------------------------------------------
 253 // wxIDataObject
 254 // ----------------------------------------------------------------------------
 255
 256 BEGIN_IID_TABLE(wxIDataObject)
 257     ADD_IID(Unknown)
 258     ADD_IID(DataObject)
 259 END_IID_TABLE;
 260
 261 IMPLEMENT_IUNKNOWN_METHODS(wxIDataObject)
 262
 263 wxIDataObject::wxIDataObject(wxDataObject *pDataObject)
 264 {
 265     m_pDataObject = pDataObject;
 266     m_mustDelete = false;
 267 }
 268
 269 wxIDataObject::~wxIDataObject()
 270 {
 271     if ( m_mustDelete )
 272     {
 273         delete m_pDataObject;
 274     }
 275 }
 276
 277 // get data functions
 278 STDMETHODIMP wxIDataObject::GetData(FORMATETC *pformatetcIn, STGMEDIUM *pmedium)
 279 {
 280     wxLogTrace(wxTRACE_OleCalls, wxT("wxIDataObject::GetData"));
 281
 282     // is data is in our format?
 283     HRESULT hr = QueryGetData(pformatetcIn);
 284     if ( FAILED(hr) )
 285         return hr;
 286
 287     // for the bitmaps and metafiles we use the handles instead of global memory
 288     // to pass the data
 289     wxDataFormat format = (wxDataFormat::NativeFormat)pformatetcIn->cfFormat;
 290
 291     switch ( format )
 292     {
 293         case wxDF_BITMAP:
 294             pmedium->tymed = TYMED_GDI;
 295             break;
 296
 297         case wxDF_ENHMETAFILE:
 298             pmedium->tymed = TYMED_ENHMF;
 299             break;
 300
 301 #ifndef __WXWINCE__
 302         case wxDF_METAFILE:
 303             pmedium->hGlobal = GlobalAlloc(GMEM_MOVEABLE | GMEM_SHARE,
 304                                            sizeof(METAFILEPICT));
 305             if ( !pmedium->hGlobal ) {
 306                 wxLogLastError(wxT("GlobalAlloc"));
 307                 return E_OUTOFMEMORY;
 308             }
 309             pmedium->tymed = TYMED_MFPICT;
 310             break;
 311 #endif
 312         default:
 313             // alloc memory
 314             size_t size = m_pDataObject->GetDataSize(format);
 315             if ( !size ) {
 316                 // it probably means that the method is just not implemented
 317                 wxLogDebug(wxT("Invalid data size - can't be 0"));
 318
 319                 return DV_E_FORMATETC;
 320             }
 321
 322             if ( !format.IsStandard() ) {
 323                 // for custom formats, put the size with the data - alloc the
 324                 // space for it
 325                 // MB: not completely sure this is correct,
 326                 //     even if I can't figure out what's wrong
 327                 size += m_pDataObject->GetBufferOffset( format );
 328             }
 329
 330             HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE | GMEM_SHARE, size);
 331             if ( hGlobal == NULL ) {
 332                 wxLogLastError(wxT("GlobalAlloc"));
 333                 return E_OUTOFMEMORY;
 334             }
 335
 336             // copy data
 337             pmedium->tymed   = TYMED_HGLOBAL;
 338             pmedium->hGlobal = hGlobal;
 339     }
 340
 341     pmedium->pUnkForRelease = NULL;
 342
 343     // do copy the data
 344     hr = GetDataHere(pformatetcIn, pmedium);
 345     if ( FAILED(hr) ) {
 346         // free resources we allocated
 347         if ( pmedium->tymed & (TYMED_HGLOBAL | TYMED_MFPICT) ) {
 348             GlobalFree(pmedium->hGlobal);
 349         }
 350
 351         return hr;
 352     }
 353
 354     return S_OK;
 355 }
 356
 357 STDMETHODIMP wxIDataObject::GetDataHere(FORMATETC *pformatetc,
 358                                         STGMEDIUM *pmedium)
 359 {
 360     wxLogTrace(wxTRACE_OleCalls, wxT("wxIDataObject::GetDataHere"));
 361
 362     // put data in caller provided medium
 363     switch ( pmedium->tymed )
 364     {
 365         case TYMED_GDI:
 366             if ( !m_pDataObject->GetDataHere(wxDF_BITMAP, &pmedium->hBitmap) )
 367                 return E_UNEXPECTED;
 368             break;
 369
 370         case TYMED_ENHMF:
 371             if ( !m_pDataObject->GetDataHere(wxDF_ENHMETAFILE,
 372                                              &pmedium->hEnhMetaFile) )
 373                 return E_UNEXPECTED;
 374             break;
 375
 376         case TYMED_MFPICT:
 377             // fall through - we pass METAFILEPICT through HGLOBAL
 378
 379         case TYMED_HGLOBAL:
 380             {
 381                 // copy data
 382                 HGLOBAL hGlobal = pmedium->hGlobal;
 383                 void *pBuf = GlobalLock(hGlobal);
 384                 if ( pBuf == NULL ) {
 385                     wxLogLastError(wxT("GlobalLock"));
 386                     return E_OUTOFMEMORY;
 387                 }
 388
 389                 wxDataFormat format = pformatetc->cfFormat;
 390                 if ( !format.IsStandard() ) {
 391                     // for custom formats, put the size with the data
 392                     pBuf = m_pDataObject->SetSizeInBuffer( pBuf, GlobalSize(hGlobal), format );
 393                 }
 394
 395                 if ( !m_pDataObject->GetDataHere(format, pBuf) )
 396                     return E_UNEXPECTED;
 397
 398                 GlobalUnlock(hGlobal);
 399             }
 400             break;
 401
 402         default:
 403             return DV_E_TYMED;
 404     }
 405
 406     return S_OK;
 407 }
 408
 409
 410 // set data functions
 411 STDMETHODIMP wxIDataObject::SetData(FORMATETC *pformatetc,
 412                                     STGMEDIUM *pmedium,
 413                                     BOOL       fRelease)
 414 {
 415     wxLogTrace(wxTRACE_OleCalls, wxT("wxIDataObject::SetData"));
 416
 417     switch ( pmedium->tymed )
 418     {
 419         case TYMED_GDI:
 420             m_pDataObject->SetData(wxDF_BITMAP, 0, &pmedium->hBitmap);
 421             break;
 422
 423         case TYMED_ENHMF:
 424             m_pDataObject->SetData(wxDF_ENHMETAFILE, 0, &pmedium->hEnhMetaFile);
 425             break;
 426
 427         case TYMED_MFPICT:
 428             // fall through - we pass METAFILEPICT through HGLOBAL
 429         case TYMED_HGLOBAL:
 430             {
 431                 wxDataFormat format = pformatetc->cfFormat;
 432
 433                 // this is quite weird, but for file drag and drop, explorer
 434                 // calls our SetData() with the formats we do *not* support!
 435                 //
 436                 // as we can't fix this bug in explorer (it's a bug because it
 437                 // should only use formats returned by EnumFormatEtc), do the
 438                 // check here
 439                 if ( !m_pDataObject->IsSupported(format, wxDataObject::Set) ) {
 440                     // go away!
 441                     return DV_E_FORMATETC;
 442                 }
 443
 444                 // copy data
 445                 const void *pBuf = GlobalLock(pmedium->hGlobal);
 446                 if ( pBuf == NULL ) {
 447                     wxLogLastError(wxT("GlobalLock"));
 448
 449                     return E_OUTOFMEMORY;
 450                 }
 451
 452                 // we've got a problem with SetData() here because the base
 453                 // class version requires the size parameter which we don't
 454                 // have anywhere in OLE data transfer - so we need to
 455                 // synthetise it for known formats and we suppose that all data
 456                 // in custom formats starts with a DWORD containing the size
 457                 size_t size;
 458                 switch ( format )
 459                 {
 460                     case CF_TEXT:
 461                     case CF_OEMTEXT:
 462                         size = strlen((const char *)pBuf);
 463                         break;
 464 #if !(defined(__BORLANDC__) && (__BORLANDC__ < 0x500))
 465                     case CF_UNICODETEXT:
 466 #if ( defined(__BORLANDC__) && (__BORLANDC__ > 0x530) ) \
 467     || ( defined(__MWERKS__) && defined(__WXMSW__) )
 468                         size = std::wcslen((const wchar_t *)pBuf) * sizeof(wchar_t);
 469 #else
 470                         size = wxWcslen((const wchar_t *)pBuf) * sizeof(wchar_t);
 471 #endif
 472                         break;
 473 #endif
 474                     case CF_BITMAP:
 475 #ifndef __WXWINCE__
 476                     case CF_HDROP:
 477                         // these formats don't use size at all, anyhow (but
 478                         // pass data by handle, which is always a single DWORD)
 479                         size = 0;
 480                         break;
 481 #endif
 482
 483                     case CF_DIB:
 484                         // the handler will calculate size itself (it's too
 485                         // complicated to do it here)
 486                         size = 0;
 487                         break;
 488
 489 #ifndef __WXWINCE__
 490                     case CF_METAFILEPICT:
 491                         size = sizeof(METAFILEPICT);
 492                         break;
 493 #endif
 494                     default:
 495                         {
 496                             // we suppose that the size precedes the data
 497                             pBuf = m_pDataObject->GetSizeFromBuffer( pBuf, &size, format );
 498                             if (! format.IsStandard() ) {
 499                                 // see GetData for corresponding increment
 500                                 size -= m_pDataObject->GetBufferOffset( format  );
 501                             }
 502                         }
 503                 }
 504
 505                 bool ok = m_pDataObject->SetData(format, size, pBuf);
 506
 507                 GlobalUnlock(pmedium->hGlobal);
 508
 509                 if ( !ok ) {
 510                     return E_UNEXPECTED;
 511                 }
 512             }
 513             break;
 514
 515         default:
 516             return DV_E_TYMED;
 517     }
 518
 519     if ( fRelease ) {
 520         // we own the medium, so we must release it - but do *not* free any
 521         // data we pass by handle because we have copied it elsewhere
 522         switch ( pmedium->tymed )
 523         {
 524             case TYMED_GDI:
 525                 pmedium->hBitmap = 0;
 526                 break;
 527
 528             case TYMED_MFPICT:
 529                 pmedium->hMetaFilePict = 0;
 530                 break;
 531
 532             case TYMED_ENHMF:
 533                 pmedium->hEnhMetaFile = 0;
 534                 break;
 535         }
 536
 537         ReleaseStgMedium(pmedium);
 538     }
 539
 540     return S_OK;
 541 }
 542
 543 // information functions
 544 STDMETHODIMP wxIDataObject::QueryGetData(FORMATETC *pformatetc)
 545 {
 546     // do we accept data in this format?
 547     if ( pformatetc == NULL ) {
 548         wxLogTrace(wxTRACE_OleCalls,
 549                    wxT("wxIDataObject::QueryGetData: invalid ptr."));
 550
 551         return E_INVALIDARG;
 552     }
 553
 554     // the only one allowed by current COM implementation
 555     if ( pformatetc->lindex != -1 ) {
 556         wxLogTrace(wxTRACE_OleCalls,
 557                    wxT("wxIDataObject::QueryGetData: bad lindex %ld"),
 558                    pformatetc->lindex);
 559
 560         return DV_E_LINDEX;
 561     }
 562
 563     // we don't support anything other (THUMBNAIL, ICON, DOCPRINT...)
 564     if ( pformatetc->dwAspect != DVASPECT_CONTENT ) {
 565         wxLogTrace(wxTRACE_OleCalls,
 566                    wxT("wxIDataObject::QueryGetData: bad dwAspect %ld"),
 567                    pformatetc->dwAspect);
 568
 569         return DV_E_DVASPECT;
 570     }
 571
 572     // and now check the type of data requested
 573     wxDataFormat format = pformatetc->cfFormat;
 574     if ( m_pDataObject->IsSupportedFormat(format) ) {
 575         wxLogTrace(wxTRACE_OleCalls, wxT("wxIDataObject::QueryGetData: %s ok"),
 576                    wxGetFormatName(format));
 577     }
 578     else {
 579         wxLogTrace(wxTRACE_OleCalls,
 580                    wxT("wxIDataObject::QueryGetData: %s unsupported"),
 581                    wxGetFormatName(format));
 582
 583         return DV_E_FORMATETC;
 584     }
 585
 586     // we only transfer data by global memory, except for some particular cases
 587     DWORD tymed = pformatetc->tymed;
 588     if ( (format == wxDF_BITMAP && !(tymed & TYMED_GDI)) &&
 589          !(tymed & TYMED_HGLOBAL) ) {
 590         // it's not what we're waiting for
 591         wxLogTrace(wxTRACE_OleCalls,
 592                    wxT("wxIDataObject::QueryGetData: %s != %s"),
 593                    GetTymedName(tymed),
 594                    GetTymedName(format == wxDF_BITMAP ? TYMED_GDI
 595                                                       : TYMED_HGLOBAL));
 596
 597         return DV_E_TYMED;
 598     }
 599
 600     return S_OK;
 601 }
 602
 603 STDMETHODIMP wxIDataObject::GetCanonicalFormatEtc(FORMATETC *WXUNUSED(pFormatetcIn),
 604                                                   FORMATETC *pFormatetcOut)
 605 {
 606     wxLogTrace(wxTRACE_OleCalls, wxT("wxIDataObject::GetCanonicalFormatEtc"));
 607
 608     // TODO we might want something better than this trivial implementation here
 609     if ( pFormatetcOut != NULL )
 610         pFormatetcOut->ptd = NULL;
 611
 612     return DATA_S_SAMEFORMATETC;
 613 }
 614
 615 STDMETHODIMP wxIDataObject::EnumFormatEtc(DWORD dwDir,
 616                                           IEnumFORMATETC **ppenumFormatEtc)
 617 {
 618     wxLogTrace(wxTRACE_OleCalls, wxT("wxIDataObject::EnumFormatEtc"));
 619
 620     wxDataObject::Direction dir = dwDir == DATADIR_GET ? wxDataObject::Get
 621                                                        : wxDataObject::Set;
 622
 623     ULONG nFormatCount = wx_truncate_cast(ULONG, m_pDataObject->GetFormatCount(dir));
 624     wxDataFormat format;
 625     wxDataFormat *formats;
 626     formats = nFormatCount == 1 ? &format : new wxDataFormat[nFormatCount];
 627     m_pDataObject->GetAllFormats(formats, dir);
 628
 629     wxIEnumFORMATETC *pEnum = new wxIEnumFORMATETC(formats, nFormatCount);
 630     pEnum->AddRef();
 631     *ppenumFormatEtc = pEnum;
 632
 633     if ( formats != &format ) {
 634         delete [] formats;
 635     }
 636
 637     return S_OK;
 638 }
 639
 640 // ----------------------------------------------------------------------------
 641 // advise sink functions (not implemented)
 642 // ----------------------------------------------------------------------------
 643
 644 STDMETHODIMP wxIDataObject::DAdvise(FORMATETC   *WXUNUSED(pformatetc),
 645                                     DWORD        WXUNUSED(advf),
 646                                     IAdviseSink *WXUNUSED(pAdvSink),
 647                                     DWORD       *WXUNUSED(pdwConnection))
 648 {
 649   return OLE_E_ADVISENOTSUPPORTED;
 650 }
 651
 652 STDMETHODIMP wxIDataObject::DUnadvise(DWORD WXUNUSED(dwConnection))
 653 {
 654   return OLE_E_ADVISENOTSUPPORTED;
 655 }
 656
 657 STDMETHODIMP wxIDataObject::EnumDAdvise(IEnumSTATDATA **WXUNUSED(ppenumAdvise))
 658 {
 659   return OLE_E_ADVISENOTSUPPORTED;
 660 }
 661
 662 // ----------------------------------------------------------------------------
 663 // wxDataObject
 664 // ----------------------------------------------------------------------------
 665
 666 wxDataObject::wxDataObject()
 667 {
 668     m_pIDataObject = new wxIDataObject(this);
 669     m_pIDataObject->AddRef();
 670 }
 671
 672 wxDataObject::~wxDataObject()
 673 {
 674     ReleaseInterface(m_pIDataObject);
 675 }
 676
 677 void wxDataObject::SetAutoDelete()
 678 {
 679     ((wxIDataObject *)m_pIDataObject)->SetDeleteFlag();
 680     m_pIDataObject->Release();
 681
 682     // so that the dtor doesnt' crash
 683     m_pIDataObject = NULL;
 684 }
 685
 686 size_t wxDataObject::GetBufferOffset( const wxDataFormat& WXUNUSED(format) )
 687 {
 688     return sizeof(size_t);
 689 }
 690
 691 const void* wxDataObject::GetSizeFromBuffer( const void* buffer, size_t* size,
 692                                              const wxDataFormat& WXUNUSED(format) )
 693 {
 694     size_t* p = (size_t*)buffer;
 695     *size = *p;
 696
 697     return p + 1;
 698 }
 699
 700 void* wxDataObject::SetSizeInBuffer( void* buffer, size_t size,
 701                                        const wxDataFormat& WXUNUSED(format) )
 702 {
 703     size_t* p = (size_t*)buffer;
 704     *p = size;
 705
 706     return p + 1;
 707 }
 708
 709 #ifdef __WXDEBUG__
 710
 711 const wxChar *wxDataObject::GetFormatName(wxDataFormat format)
 712 {
 713     // case 'xxx' is not a valid value for switch of enum 'wxDataFormat'
 714     #ifdef __VISUALC__
 715         #pragma warning(disable:4063)
 716     #endif // VC++
 717
 718     static wxChar s_szBuf[256];
 719     switch ( format ) {
 720         case CF_TEXT:         return wxT("CF_TEXT");
 721         case CF_BITMAP:       return wxT("CF_BITMAP");
 722         case CF_SYLK:         return wxT("CF_SYLK");
 723         case CF_DIF:          return wxT("CF_DIF");
 724         case CF_TIFF:         return wxT("CF_TIFF");
 725         case CF_OEMTEXT:      return wxT("CF_OEMTEXT");
 726         case CF_DIB:          return wxT("CF_DIB");
 727         case CF_PALETTE:      return wxT("CF_PALETTE");
 728         case CF_PENDATA:      return wxT("CF_PENDATA");
 729         case CF_RIFF:         return wxT("CF_RIFF");
 730         case CF_WAVE:         return wxT("CF_WAVE");
 731         case CF_UNICODETEXT:  return wxT("CF_UNICODETEXT");
 732 #ifndef __WXWINCE__
 733         case CF_METAFILEPICT: return wxT("CF_METAFILEPICT");
 734         case CF_ENHMETAFILE:  return wxT("CF_ENHMETAFILE");
 735         case CF_LOCALE:       return wxT("CF_LOCALE");
 736         case CF_HDROP:        return wxT("CF_HDROP");
 737 #endif
 738
 739         default:
 740             if ( !::GetClipboardFormatName(format, s_szBuf, WXSIZEOF(s_szBuf)) )
 741             {
 742                 // it must be a new predefined format we don't know the name of
 743                 wxSprintf(s_szBuf, wxT("unknown CF (0x%04x)"), format.GetFormatId());
 744             }
 745
 746             return s_szBuf;
 747     }
 748
 749     #ifdef __VISUALC__
 750         #pragma warning(default:4063)
 751     #endif // VC++
 752 }
 753
 754 #endif // Debug
 755
 756 // ----------------------------------------------------------------------------
 757 // wxBitmapDataObject supports CF_DIB format
 758 // ----------------------------------------------------------------------------
 759
 760 // TODO: support CF_DIB under Windows CE as well
 761
 762 size_t wxBitmapDataObject::GetDataSize() const
 763 {
 764 #if wxUSE_WXDIB && !defined(__WXWINCE__)
 765     return wxDIB::ConvertFromBitmap(NULL, GetHbitmapOf(GetBitmap()));
 766 #else
 767     return 0;
 768 #endif
 769 }
 770
 771 bool wxBitmapDataObject::GetDataHere(void *buf) const
 772 {
 773 #if wxUSE_WXDIB && !defined(__WXWINCE__)
 774     BITMAPINFO * const pbi = (BITMAPINFO *)buf;
 775
 776     return wxDIB::ConvertFromBitmap(pbi, GetHbitmapOf(GetBitmap())) != 0;
 777 #else
 778     wxUnusedVar(buf);
 779     return false;
 780 #endif
 781 }
 782
 783 bool wxBitmapDataObject::SetData(size_t WXUNUSED(len), const void *buf)
 784 {
 785 #if wxUSE_WXDIB && !defined(__WXWINCE__)
 786     const BITMAPINFO * const pbmi = (const BITMAPINFO *)buf;
 787
 788     HBITMAP hbmp = wxDIB::ConvertToBitmap(pbmi);
 789
 790     wxCHECK_MSG( hbmp, FALSE, wxT("pasting/dropping invalid bitmap") );
 791
 792     const BITMAPINFOHEADER * const pbmih = &pbmi->bmiHeader;
 793     wxBitmap bitmap(pbmih->biWidth, pbmih->biHeight, pbmih->biBitCount);
 794     bitmap.SetHBITMAP((WXHBITMAP)hbmp);
 795
 796     // TODO: create wxPalette if the bitmap has any
 797
 798     SetBitmap(bitmap);
 799
 800     return true;
 801 #else
 802     wxUnusedVar(buf);
 803     return false;
 804 #endif
 805 }
 806
 807 // ----------------------------------------------------------------------------
 808 // wxBitmapDataObject2 supports CF_BITMAP format
 809 // ----------------------------------------------------------------------------
 810
 811 // the bitmaps aren't passed by value as other types of data (i.e. by copying
 812 // the data into a global memory chunk and passing it to the clipboard or
 813 // another application or whatever), but by handle, so these generic functions
 814 // don't make much sense to them.
 815
 816 size_t wxBitmapDataObject2::GetDataSize() const
 817 {
 818     return 0;
 819 }
 820
 821 bool wxBitmapDataObject2::GetDataHere(void *pBuf) const
 822 {
 823     // we put a bitmap handle into pBuf
 824     *(WXHBITMAP *)pBuf = GetBitmap().GetHBITMAP();
 825
 826     return true;
 827 }
 828
 829 bool wxBitmapDataObject2::SetData(size_t WXUNUSED(len), const void *pBuf)
 830 {
 831     HBITMAP hbmp = *(HBITMAP *)pBuf;
 832
 833     BITMAP bmp;
 834     if ( !GetObject(hbmp, sizeof(BITMAP), &bmp) )
 835     {
 836         wxLogLastError(wxT("GetObject(HBITMAP)"));
 837     }
 838
 839     wxBitmap bitmap(bmp.bmWidth, bmp.bmHeight, bmp.bmPlanes);
 840     bitmap.SetHBITMAP((WXHBITMAP)hbmp);
 841
 842     if ( !bitmap.Ok() ) {
 843         wxFAIL_MSG(wxT("pasting/dropping invalid bitmap"));
 844
 845         return false;
 846     }
 847
 848     SetBitmap(bitmap);
 849
 850     return true;
 851 }
 852
 853 #if 0
 854
 855 size_t wxBitmapDataObject::GetDataSize(const wxDataFormat& format) const
 856 {
 857     if ( format.GetFormatId() == CF_DIB )
 858     {
 859         // create the DIB
 860         ScreenHDC hdc;
 861
 862         // shouldn't be selected into a DC or GetDIBits() would fail
 863         wxASSERT_MSG( !m_bitmap.GetSelectedInto(),
 864                       wxT("can't copy bitmap selected into wxMemoryDC") );
 865
 866         // first get the info
 867         BITMAPINFO bi;
 868         if ( !GetDIBits(hdc, (HBITMAP)m_bitmap.GetHBITMAP(), 0, 0,
 869                         NULL, &bi, DIB_RGB_COLORS) )
 870         {
 871             wxLogLastError(wxT("GetDIBits(NULL)"));
 872
 873             return 0;
 874         }
 875
 876         return sizeof(BITMAPINFO) + bi.bmiHeader.biSizeImage;
 877     }
 878     else // CF_BITMAP
 879     {
 880         // no data to copy - we don't pass HBITMAP via global memory
 881         return 0;
 882     }
 883 }
 884
 885 bool wxBitmapDataObject::GetDataHere(const wxDataFormat& format,
 886                                      void *pBuf) const
 887 {
 888     wxASSERT_MSG( m_bitmap.Ok(), wxT("copying invalid bitmap") );
 889
 890     HBITMAP hbmp = (HBITMAP)m_bitmap.GetHBITMAP();
 891     if ( format.GetFormatId() == CF_DIB )
 892     {
 893         // create the DIB
 894         ScreenHDC hdc;
 895
 896         // shouldn't be selected into a DC or GetDIBits() would fail
 897         wxASSERT_MSG( !m_bitmap.GetSelectedInto(),
 898                       wxT("can't copy bitmap selected into wxMemoryDC") );
 899
 900         // first get the info
 901         BITMAPINFO *pbi = (BITMAPINFO *)pBuf;
 902         if ( !GetDIBits(hdc, hbmp, 0, 0, NULL, pbi, DIB_RGB_COLORS) )
 903         {
 904             wxLogLastError(wxT("GetDIBits(NULL)"));
 905
 906             return 0;
 907         }
 908
 909         // and now copy the bits
 910         if ( !GetDIBits(hdc, hbmp, 0, pbi->bmiHeader.biHeight, pbi + 1,
 911                         pbi, DIB_RGB_COLORS) )
 912         {
 913             wxLogLastError(wxT("GetDIBits"));
 914
 915             return false;
 916         }
 917     }
 918     else // CF_BITMAP
 919     {
 920         // we put a bitmap handle into pBuf
 921         *(HBITMAP *)pBuf = hbmp;
 922     }
 923
 924     return true;
 925 }
 926
 927 bool wxBitmapDataObject::SetData(const wxDataFormat& format,
 928                                  size_t size, const void *pBuf)
 929 {
 930     HBITMAP hbmp;
 931     if ( format.GetFormatId() == CF_DIB )
 932     {
 933         // here we get BITMAPINFO struct followed by the actual bitmap bits and
 934         // BITMAPINFO starts with BITMAPINFOHEADER followed by colour info
 935         ScreenHDC hdc;
 936
 937         BITMAPINFO *pbmi = (BITMAPINFO *)pBuf;
 938         BITMAPINFOHEADER *pbmih = &pbmi->bmiHeader;
 939         hbmp = CreateDIBitmap(hdc, pbmih, CBM_INIT,
 940                               pbmi + 1, pbmi, DIB_RGB_COLORS);
 941         if ( !hbmp )
 942         {
 943             wxLogLastError(wxT("CreateDIBitmap"));
 944         }
 945
 946         m_bitmap.SetWidth(pbmih->biWidth);
 947         m_bitmap.SetHeight(pbmih->biHeight);
 948     }
 949     else // CF_BITMAP
 950     {
 951         // it's easy with bitmaps: we pass them by handle
 952         hbmp = *(HBITMAP *)pBuf;
 953
 954         BITMAP bmp;
 955         if ( !GetObject(hbmp, sizeof(BITMAP), &bmp) )
 956         {
 957             wxLogLastError(wxT("GetObject(HBITMAP)"));
 958         }
 959
 960         m_bitmap.SetWidth(bmp.bmWidth);
 961         m_bitmap.SetHeight(bmp.bmHeight);
 962         m_bitmap.SetDepth(bmp.bmPlanes);
 963     }
 964
 965     m_bitmap.SetHBITMAP((WXHBITMAP)hbmp);
 966
 967     wxASSERT_MSG( m_bitmap.Ok(), wxT("pasting invalid bitmap") );
 968
 969     return true;
 970 }
 971
 972 #endif // 0
 973
 974 // ----------------------------------------------------------------------------
 975 // wxFileDataObject
 976 // ----------------------------------------------------------------------------
 977
 978 bool wxFileDataObject::SetData(size_t WXUNUSED(size),
 979                                const void *WXUNUSED_IN_WINCE(pData))
 980 {
 981 #ifndef __WXWINCE__
 982     m_filenames.Empty();
 983
 984     // the documentation states that the first member of DROPFILES structure is
 985     // a "DWORD offset of double NUL terminated file list". What they mean by
 986     // this (I wonder if you see it immediately) is that the list starts at
 987     // ((char *)&(pDropFiles.pFiles)) + pDropFiles.pFiles. We're also advised
 988     // to use DragQueryFile to work with this structure, but not told where and
 989     // how to get HDROP.
 990     HDROP hdrop = (HDROP)pData;   // NB: it works, but I'm not sure about it
 991
 992     // get number of files (magic value -1)
 993     UINT nFiles = ::DragQueryFile(hdrop, (unsigned)-1, NULL, 0u);
 994
 995     wxCHECK_MSG ( nFiles != (UINT)-1, FALSE, wxT("wrong HDROP handle") );
 996
 997     // for each file get the length, allocate memory and then get the name
 998     wxString str;
 999     UINT len, n;
1000     for ( n = 0; n < nFiles; n++ ) {
1001         // +1 for terminating NUL
1002         len = ::DragQueryFile(hdrop, n, NULL, 0) + 1;
1003
1004         UINT len2 = ::DragQueryFile(hdrop, n, wxStringBuffer(str, len), len);
1005         m_filenames.Add(str);
1006
1007         if ( len2 != len - 1 ) {
1008             wxLogDebug(wxT("In wxFileDropTarget::OnDrop DragQueryFile returned\
1009  %d characters, %d expected."), len2, len - 1);
1010         }
1011     }
1012
1013     return true;
1014 #else
1015     return false;
1016 #endif
1017 }
1018
1019 void wxFileDataObject::AddFile(const wxString& file)
1020 {
1021     // just add file to filenames array
1022     // all useful data (such as DROPFILES struct) will be
1023     // created later as necessary
1024     m_filenames.Add(file);
1025 }
1026
1027 size_t wxFileDataObject::GetDataSize() const
1028 {
1029 #ifndef __WXWINCE__
1030     // size returned will be the size of the DROPFILES structure,
1031     // plus the list of filesnames (null byte separated), plus
1032     // a double null at the end
1033
1034     // if no filenames in list, size is 0
1035     if ( m_filenames.GetCount() == 0 )
1036         return 0;
1037
1038     // inital size of DROPFILES struct + null byte
1039     size_t sz = sizeof(DROPFILES) + (1 * sizeof(wxChar));
1040
1041     size_t count = m_filenames.GetCount();
1042     for ( size_t i = 0; i < count; i++ )
1043     {
1044         // add filename length plus null byte
1045         sz += (m_filenames[i].Len() + 1) * sizeof(wxChar);
1046     }
1047
1048     return sz;
1049 #else
1050     return 0;
1051 #endif
1052 }
1053
1054 bool wxFileDataObject::GetDataHere(void *WXUNUSED_IN_WINCE(pData)) const
1055 {
1056 #ifndef __WXWINCE__
1057     // pData points to an externally allocated memory block
1058     // created using the size returned by GetDataSize()
1059
1060     // if pData is NULL, or there are no files, return
1061     if ( !pData || m_filenames.GetCount() == 0 )
1062         return false;
1063
1064     // convert data pointer to a DROPFILES struct pointer
1065     LPDROPFILES pDrop = (LPDROPFILES) pData;
1066
1067     // initialize DROPFILES struct
1068     pDrop->pFiles = sizeof(DROPFILES);
1069     pDrop->fNC = FALSE;                 // not non-client coords
1070 #if wxUSE_UNICODE
1071     pDrop->fWide = TRUE;
1072 #else // ANSI
1073     pDrop->fWide = FALSE;
1074 #endif // Unicode/Ansi
1075
1076     // set start of filenames list (null separated)
1077     wxChar *pbuf = (wxChar*) ((BYTE *)pDrop + sizeof(DROPFILES));
1078
1079     size_t count = m_filenames.GetCount();
1080     for (size_t i = 0; i < count; i++ )
1081     {
1082         // copy filename to pbuf and add null terminator
1083         size_t len = m_filenames[i].Len();
1084         memcpy(pbuf, m_filenames[i], len*sizeof(wxChar));
1085         pbuf += len;
1086         *pbuf++ = wxT('\0');
1087     }
1088
1089     // add final null terminator
1090     *pbuf = wxT('\0');
1091
1092     return true;
1093 #else
1094     return false;
1095 #endif
1096 }
1097
1098 // ----------------------------------------------------------------------------
1099 // wxURLDataObject
1100 // ----------------------------------------------------------------------------
1101
1102 class CFSTR_SHELLURLDataObject : public wxCustomDataObject
1103 {
1104 public:
1105     CFSTR_SHELLURLDataObject() : wxCustomDataObject(CFSTR_SHELLURL) {}
1106 protected:
1107     virtual size_t GetBufferOffset( const wxDataFormat& WXUNUSED(format) )
1108     {
1109         return 0;
1110     }
1111
1112     virtual const void* GetSizeFromBuffer( const void* buffer, size_t* size,
1113                                            const wxDataFormat& WXUNUSED(format) )
1114     {
1115         // CFSTR_SHELLURL is _always_ ANSI text
1116         *size = strlen( (const char*)buffer );
1117
1118         return buffer;
1119     }
1120
1121     virtual void* SetSizeInBuffer( void* buffer, size_t WXUNUSED(size),
1122                                    const wxDataFormat& WXUNUSED(format) )
1123     {
1124         return buffer;
1125     }
1126
1127 #if wxUSE_UNICODE
1128     virtual bool GetDataHere( void* buffer ) const
1129     {
1130         // CFSTR_SHELLURL is _always_ ANSI!
1131         wxCharBuffer char_buffer( GetDataSize() );
1132         wxCustomDataObject::GetDataHere( (void*)char_buffer.data() );
1133         wxString unicode_buffer( char_buffer, wxConvLibc );
1134         memcpy( buffer, unicode_buffer.c_str(),
1135                 ( unicode_buffer.length() + 1 ) * sizeof(wxChar) );
1136
1137         return true;
1138     }
1139     virtual bool GetDataHere(const wxDataFormat& WXUNUSED(format),
1140                              void *buf) const
1141         { return GetDataHere(buf); }
1142 #endif
1143
1144     DECLARE_NO_COPY_CLASS(CFSTR_SHELLURLDataObject)
1145 };
1146
1147
1148
1149 wxURLDataObject::wxURLDataObject()
1150 {
1151     // we support CF_TEXT and CFSTR_SHELLURL formats which are basicly the same
1152     // but it seems that some browsers only provide one of them so we have to
1153     // support both
1154     Add(new wxTextDataObject);
1155     Add(new CFSTR_SHELLURLDataObject());
1156
1157     // we don't have any data yet
1158     m_dataObjectLast = NULL;
1159 }
1160
1161 bool wxURLDataObject::SetData(const wxDataFormat& format,
1162                               size_t len,
1163                               const void *buf)
1164 {
1165     m_dataObjectLast = GetObject(format);
1166
1167     wxCHECK_MSG( m_dataObjectLast, FALSE,
1168                  wxT("unsupported format in wxURLDataObject"));
1169
1170     return m_dataObjectLast->SetData(len, buf);
1171 }
1172
1173 wxString wxURLDataObject::GetURL() const
1174 {
1175     wxString url;
1176     wxCHECK_MSG( m_dataObjectLast, url, _T("no data in wxURLDataObject") );
1177
1178     size_t len = m_dataObjectLast->GetDataSize();
1179
1180     m_dataObjectLast->GetDataHere(wxStringBuffer(url, len));
1181
1182     return url;
1183 }
1184
1185 void wxURLDataObject::SetURL(const wxString& url)
1186 {
1187     SetData(wxDataFormat(wxUSE_UNICODE ? wxDF_UNICODETEXT : wxDF_TEXT),
1188             url.Length()+1, url.c_str());
1189
1190     // CFSTR_SHELLURL is always supposed to be ANSI...
1191     wxWX2MBbuf urlA = (wxWX2MBbuf)url.mbc_str();
1192     size_t len = strlen(urlA);
1193     SetData(wxDataFormat(CFSTR_SHELLURL), len+1, (const char*)urlA);
1194 }
1195
1196 // ----------------------------------------------------------------------------
1197 // private functions
1198 // ----------------------------------------------------------------------------
1199
1200 #ifdef __WXDEBUG__
1201
1202 static const wxChar *GetTymedName(DWORD tymed)
1203 {
1204     static wxChar s_szBuf[128];
1205     switch ( tymed ) {
1206         case TYMED_HGLOBAL:   return wxT("TYMED_HGLOBAL");
1207         case TYMED_FILE:      return wxT("TYMED_FILE");
1208         case TYMED_ISTREAM:   return wxT("TYMED_ISTREAM");
1209         case TYMED_ISTORAGE:  return wxT("TYMED_ISTORAGE");
1210         case TYMED_GDI:       return wxT("TYMED_GDI");
1211         case TYMED_MFPICT:    return wxT("TYMED_MFPICT");
1212         case TYMED_ENHMF:     return wxT("TYMED_ENHMF");
1213         default:
1214             wxSprintf(s_szBuf, wxT("type of media format %ld (unknown)"), tymed);
1215             return s_szBuf;
1216     }
1217 }
1218
1219 #endif // Debug
1220
1221 #else // not using OLE at all
1222
1223 // ----------------------------------------------------------------------------
1224 // wxDataObject
1225 // ----------------------------------------------------------------------------
1226
1227 #if wxUSE_DATAOBJ
1228
1229 wxDataObject::wxDataObject()
1230 {
1231 }
1232
1233 wxDataObject::~wxDataObject()
1234 {
1235 }
1236
1237 void wxDataObject::SetAutoDelete()
1238 {
1239 }
1240
1241 #ifdef __WXDEBUG__
1242 const wxChar *wxDataObject::GetFormatName(wxDataFormat WXUNUSED(format))
1243 {
1244     return NULL;
1245 }
1246 #endif // __WXDEBUG__
1247
1248 #endif // wxUSE_DATAOBJ
1249
1250 #endif // wxUSE_OLE/!wxUSE_OLE
1251
1252