src/msw/clipbrd.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        clipbrd.cpp
   3 // Purpose:     Clipboard functionality
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   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 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 #if wxUSE_CLIPBOARD
  28
  29 #ifndef WX_PRECOMP
  30     #include "wx/object.h"
  31     #include "wx/event.h"
  32     #include "wx/app.h"
  33     #include "wx/frame.h"
  34     #include "wx/bitmap.h"
  35     #include "wx/utils.h"
  36     #include "wx/intl.h"
  37 #endif
  38
  39 #if wxUSE_METAFILE
  40     #include "wx/metafile.h"
  41 #endif
  42
  43 #include "wx/log.h"
  44 #include "wx/clipbrd.h"
  45
  46 #include <string.h>
  47
  48 #include "wx/msw/private.h"
  49 #include "wx/msw/ole/oleutils.h"
  50
  51 #if wxUSE_WXDIB
  52     #include "wx/msw/dib.h"
  53 #endif
  54
  55 // wxDataObject is tied to OLE/drag and drop implementation, therefore so are
  56 // the functions using wxDataObject in wxClipboard
  57 //#define wxUSE_DATAOBJ wxUSE_DRAG_AND_DROP
  58
  59 #if wxUSE_DATAOBJ
  60     #include "wx/dataobj.h"
  61 #endif
  62
  63 #if wxUSE_OLE && !defined(__WXWINCE__)
  64     // use OLE clipboard
  65     #define wxUSE_OLE_CLIPBOARD 1
  66 #else // !wxUSE_DATAOBJ
  67     // use Win clipboard API
  68     #define wxUSE_OLE_CLIPBOARD 0
  69 #endif
  70
  71 #if wxUSE_OLE_CLIPBOARD
  72     #include <ole2.h>
  73 #endif // wxUSE_OLE_CLIPBOARD
  74
  75 // ===========================================================================
  76 // implementation
  77 // ===========================================================================
  78
  79 // ---------------------------------------------------------------------------
  80 // old-style clipboard functions using Windows API
  81 // ---------------------------------------------------------------------------
  82
  83 static bool gs_wxClipboardIsOpen = false;
  84
  85 bool wxOpenClipboard()
  86 {
  87     wxCHECK_MSG( !gs_wxClipboardIsOpen, true, wxT("clipboard already opened.") );
  88
  89     wxWindow *win = wxTheApp->GetTopWindow();
  90     if ( win )
  91     {
  92         gs_wxClipboardIsOpen = ::OpenClipboard((HWND)win->GetHWND()) != 0;
  93
  94         if ( !gs_wxClipboardIsOpen )
  95             wxLogSysError(_("Failed to open the clipboard."));
  96
  97         return gs_wxClipboardIsOpen;
  98     }
  99     else
 100     {
 101         wxLogDebug(wxT("Can not open clipboard without a main window."));
 102
 103         return false;
 104     }
 105 }
 106
 107 bool wxCloseClipboard()
 108 {
 109     wxCHECK_MSG( gs_wxClipboardIsOpen, false, wxT("clipboard is not opened") );
 110
 111     gs_wxClipboardIsOpen = false;
 112
 113     if ( ::CloseClipboard() == 0 )
 114     {
 115         wxLogSysError(_("Failed to close the clipboard."));
 116
 117         return false;
 118     }
 119
 120     return true;
 121 }
 122
 123 bool wxEmptyClipboard()
 124 {
 125     if ( ::EmptyClipboard() == 0 )
 126     {
 127         wxLogSysError(_("Failed to empty the clipboard."));
 128
 129         return false;
 130     }
 131
 132     return true;
 133 }
 134
 135 bool wxIsClipboardOpened()
 136 {
 137   return gs_wxClipboardIsOpen;
 138 }
 139
 140 bool wxIsClipboardFormatAvailable(wxDataFormat dataFormat)
 141 {
 142    wxDataFormat::NativeFormat cf = dataFormat.GetFormatId();
 143
 144     if ( ::IsClipboardFormatAvailable(cf) )
 145     {
 146         // ok from the first try
 147         return true;
 148     }
 149
 150     // for several standard formats, we can convert from some other ones too
 151     switch ( cf )
 152     {
 153         // for bitmaps, DIBs will also do
 154         case CF_BITMAP:
 155             return ::IsClipboardFormatAvailable(CF_DIB) != 0;
 156
 157 #if wxUSE_ENH_METAFILE && !defined(__WXWINCE__)
 158         case CF_METAFILEPICT:
 159             return ::IsClipboardFormatAvailable(CF_ENHMETAFILE) != 0;
 160 #endif // wxUSE_ENH_METAFILE
 161
 162         default:
 163             return false;
 164     }
 165 }
 166
 167
 168 bool wxSetClipboardData(wxDataFormat dataFormat,
 169                         const void *data,
 170                         int width, int height)
 171 {
 172     HANDLE handle = 0; // return value of SetClipboardData
 173
 174     switch (dataFormat)
 175     {
 176         case wxDF_BITMAP:
 177             {
 178                 wxBitmap *bitmap = (wxBitmap *)data;
 179
 180                 HDC hdcMem = CreateCompatibleDC((HDC) NULL);
 181                 HDC hdcSrc = CreateCompatibleDC((HDC) NULL);
 182                 HBITMAP old = (HBITMAP)
 183                     ::SelectObject(hdcSrc, (HBITMAP)bitmap->GetHBITMAP());
 184                 HBITMAP hBitmap = CreateCompatibleBitmap(hdcSrc,
 185                                                          bitmap->GetWidth(),
 186                                                          bitmap->GetHeight());
 187                 if (!hBitmap)
 188                 {
 189                     SelectObject(hdcSrc, old);
 190                     DeleteDC(hdcMem);
 191                     DeleteDC(hdcSrc);
 192                     return false;
 193                 }
 194
 195                 HBITMAP old1 = (HBITMAP) SelectObject(hdcMem, hBitmap);
 196                 BitBlt(hdcMem, 0, 0, bitmap->GetWidth(), bitmap->GetHeight(),
 197                        hdcSrc, 0, 0, SRCCOPY);
 198
 199                 // Select new bitmap out of memory DC
 200                 SelectObject(hdcMem, old1);
 201
 202                 // Set the data
 203                 handle = ::SetClipboardData(CF_BITMAP, hBitmap);
 204
 205                 // Clean up
 206                 SelectObject(hdcSrc, old);
 207                 DeleteDC(hdcSrc);
 208                 DeleteDC(hdcMem);
 209                 break;
 210             }
 211
 212 #if wxUSE_WXDIB
 213         case wxDF_DIB:
 214             {
 215                 wxBitmap *bitmap = (wxBitmap *)data;
 216
 217                 if ( bitmap && bitmap->Ok() )
 218                 {
 219                     wxDIB dib(*bitmap);
 220                     if ( dib.IsOk() )
 221                     {
 222                         handle = ::SetClipboardData(CF_DIB, dib.Detach());
 223                     }
 224                 }
 225                 break;
 226             }
 227 #endif
 228
 229     // VZ: I'm told that this code works, but it doesn't seem to work for me
 230     //     and, anyhow, I'd be highly surprised if it did. So I leave it here
 231     //     but IMNSHO it is completely broken.
 232 #if wxUSE_METAFILE && !defined(wxMETAFILE_IS_ENH) && !defined(__WXWINCE__)
 233         case wxDF_METAFILE:
 234             {
 235                 wxMetafile *wxMF = (wxMetafile *)data;
 236                 HANDLE data = GlobalAlloc(GHND, sizeof(METAFILEPICT) + 1);
 237                 METAFILEPICT *mf = (METAFILEPICT *)GlobalLock(data);
 238
 239                 mf->mm = wxMF->GetWindowsMappingMode();
 240                 mf->xExt = width;
 241                 mf->yExt = height;
 242                 mf->hMF = (HMETAFILE) wxMF->GetHMETAFILE();
 243                 GlobalUnlock(data);
 244                 wxMF->SetHMETAFILE((WXHANDLE) NULL);
 245
 246                 handle = SetClipboardData(CF_METAFILEPICT, data);
 247                 break;
 248             }
 249 #endif // wxUSE_METAFILE
 250
 251 #if wxUSE_ENH_METAFILE && !defined(__WXWINCE__)
 252         case wxDF_ENHMETAFILE:
 253             {
 254                 wxEnhMetaFile *emf = (wxEnhMetaFile *)data;
 255                 wxEnhMetaFile emfCopy = *emf;
 256
 257                 handle = SetClipboardData(CF_ENHMETAFILE,
 258                                           (void *)emfCopy.GetHENHMETAFILE());
 259             }
 260             break;
 261 #endif // wxUSE_ENH_METAFILE
 262
 263         case CF_SYLK:
 264         case CF_DIF:
 265         case CF_TIFF:
 266         case CF_PALETTE:
 267         default:
 268             {
 269                 wxLogError(_("Unsupported clipboard format."));
 270                 return false;
 271             }
 272
 273         case wxDF_OEMTEXT:
 274             dataFormat = wxDF_TEXT;
 275             // fall through
 276
 277         case wxDF_TEXT:
 278             {
 279                 char *s = (char *)data;
 280
 281                 width = strlen(s) + 1;
 282                 height = 1;
 283                 DWORD l = (width * height);
 284                 HANDLE hGlobalMemory = GlobalAlloc(GHND, l);
 285                 if ( hGlobalMemory )
 286                 {
 287                     LPSTR lpGlobalMemory = (LPSTR)GlobalLock(hGlobalMemory);
 288
 289                     memcpy(lpGlobalMemory, s, l);
 290
 291                     GlobalUnlock(hGlobalMemory);
 292                 }
 293
 294                 handle = SetClipboardData(dataFormat, hGlobalMemory);
 295                 break;
 296             }
 297             // Only tested with Visual C++ 6.0 so far
 298 #if defined(__VISUALC__)
 299         case wxDF_HTML:
 300             {
 301                 char* html = (char *)data;
 302
 303                 // Create temporary buffer for HTML header...
 304                 char *buf = new char [400 + strlen(html)];
 305                 if(!buf) return false;
 306
 307                 // Get clipboard id for HTML format...
 308                 static int cfid = 0;
 309                 if(!cfid) cfid = RegisterClipboardFormat(wxT("HTML Format"));
 310
 311                 // Create a template string for the HTML header...
 312                 strcpy(buf,
 313                     "Version:0.9\r\n"
 314                     "StartHTML:00000000\r\n"
 315                     "EndHTML:00000000\r\n"
 316                     "StartFragment:00000000\r\n"
 317                     "EndFragment:00000000\r\n"
 318                     "<html><body>\r\n"
 319                     "<!--StartFragment -->\r\n");
 320
 321                 // Append the HTML...
 322                 strcat(buf, html);
 323                 strcat(buf, "\r\n");
 324                 // Finish up the HTML format...
 325                 strcat(buf,
 326                     "<!--EndFragment-->\r\n"
 327                     "</body>\r\n"
 328                     "</html>");
 329
 330                 // Now go back, calculate all the lengths, and write out the
 331                 // necessary header information. Note, wsprintf() truncates the
 332                 // string when you overwrite it so you follow up with code to replace
 333                 // the 0 appended at the end with a '\r'...
 334                 char *ptr = strstr(buf, "StartHTML");
 335                 sprintf(ptr+10, "%08u", strstr(buf, "<html>") - buf);
 336                 *(ptr+10+8) = '\r';
 337
 338                 ptr = strstr(buf, "EndHTML");
 339                 sprintf(ptr+8, "%08u", strlen(buf));
 340                 *(ptr+8+8) = '\r';
 341
 342                 ptr = strstr(buf, "StartFragment");
 343                 sprintf(ptr+14, "%08u", strstr(buf, "<!--StartFrag") - buf);
 344                 *(ptr+14+8) = '\r';
 345
 346                 ptr = strstr(buf, "EndFragment");
 347                 sprintf(ptr+12, "%08u", strstr(buf, "<!--EndFrag") - buf);
 348                 *(ptr+12+8) = '\r';
 349
 350                 // Now you have everything in place ready to put on the
 351                 // clipboard.
 352
 353                 // Allocate global memory for transfer...
 354                 HGLOBAL hText = GlobalAlloc(GMEM_MOVEABLE |GMEM_DDESHARE, strlen(buf)+4);
 355
 356                 // Put your string in the global memory...
 357                 ptr = (char *)GlobalLock(hText);
 358                 strcpy(ptr, buf);
 359                 GlobalUnlock(hText);
 360
 361                 handle = ::SetClipboardData(cfid, hText);
 362
 363                 // Free memory...
 364                 GlobalFree(hText);
 365
 366                 // Clean up...
 367                 delete [] buf;
 368                 break;
 369             }
 370 #endif
 371     }
 372
 373     if ( handle == 0 )
 374     {
 375         wxLogSysError(_("Failed to set clipboard data."));
 376
 377         return false;
 378     }
 379
 380     return true;
 381 }
 382
 383 void *wxGetClipboardData(wxDataFormat dataFormat, long *len)
 384 {
 385     void *retval = NULL;
 386
 387     switch ( dataFormat )
 388     {
 389 #ifndef __WXWINCE__
 390         case wxDF_BITMAP:
 391             {
 392                 BITMAP bm;
 393                 HBITMAP hBitmap = (HBITMAP) GetClipboardData(CF_BITMAP);
 394                 if (!hBitmap)
 395                     break;
 396
 397                 HDC hdcMem = CreateCompatibleDC((HDC) NULL);
 398                 HDC hdcSrc = CreateCompatibleDC((HDC) NULL);
 399
 400                 HBITMAP old = (HBITMAP) ::SelectObject(hdcSrc, hBitmap);
 401                 GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&bm);
 402
 403                 HBITMAP hNewBitmap = CreateBitmapIndirect(&bm);
 404
 405                 if (!hNewBitmap)
 406                 {
 407                     SelectObject(hdcSrc, old);
 408                     DeleteDC(hdcMem);
 409                     DeleteDC(hdcSrc);
 410                     break;
 411                 }
 412
 413                 HBITMAP old1 = (HBITMAP) SelectObject(hdcMem, hNewBitmap);
 414                 BitBlt(hdcMem, 0, 0, bm.bmWidth, bm.bmHeight,
 415                        hdcSrc, 0, 0, SRCCOPY);
 416
 417                 // Select new bitmap out of memory DC
 418                 SelectObject(hdcMem, old1);
 419
 420                 // Clean up
 421                 SelectObject(hdcSrc, old);
 422                 DeleteDC(hdcSrc);
 423                 DeleteDC(hdcMem);
 424
 425                 // Create and return a new wxBitmap
 426                 wxBitmap *wxBM = new wxBitmap;
 427                 wxBM->SetHBITMAP((WXHBITMAP) hNewBitmap);
 428                 wxBM->SetWidth(bm.bmWidth);
 429                 wxBM->SetHeight(bm.bmHeight);
 430                 wxBM->SetDepth(bm.bmPlanes);
 431                 retval = wxBM;
 432                 break;
 433             }
 434 #endif
 435         case wxDF_METAFILE:
 436         case CF_SYLK:
 437         case CF_DIF:
 438         case CF_TIFF:
 439         case CF_PALETTE:
 440         case wxDF_DIB:
 441             wxLogError(_("Unsupported clipboard format."));
 442             return NULL;
 443
 444         case wxDF_OEMTEXT:
 445             dataFormat = wxDF_TEXT;
 446             // fall through
 447
 448         case wxDF_TEXT:
 449             {
 450                 HANDLE hGlobalMemory = ::GetClipboardData(dataFormat);
 451                 if (!hGlobalMemory)
 452                     break;
 453
 454                 DWORD hsize = ::GlobalSize(hGlobalMemory);
 455                 if (len)
 456                     *len = hsize;
 457
 458                 char *s = new char[hsize];
 459                 if (!s)
 460                     break;
 461
 462                 LPSTR lpGlobalMemory = (LPSTR) GlobalLock(hGlobalMemory);
 463
 464                 memcpy(s, lpGlobalMemory, hsize);
 465
 466                 GlobalUnlock(hGlobalMemory);
 467
 468                 retval = s;
 469                 break;
 470             }
 471
 472         default:
 473             {
 474                 HANDLE hGlobalMemory = ::GetClipboardData(dataFormat);
 475                 if ( !hGlobalMemory )
 476                     break;
 477
 478                 DWORD size = ::GlobalSize(hGlobalMemory);
 479                 if ( len )
 480                     *len = size;
 481
 482                 void *buf = malloc(size);
 483                 if ( !buf )
 484                     break;
 485
 486                 LPSTR lpGlobalMemory = (LPSTR) GlobalLock(hGlobalMemory);
 487
 488                 memcpy(buf, lpGlobalMemory, size);
 489
 490                 GlobalUnlock(hGlobalMemory);
 491
 492                 retval = buf;
 493                 break;
 494             }
 495     }
 496
 497     if ( !retval )
 498     {
 499         wxLogSysError(_("Failed to retrieve data from the clipboard."));
 500     }
 501
 502     return retval;
 503 }
 504
 505 wxDataFormat wxEnumClipboardFormats(wxDataFormat dataFormat)
 506 {
 507   return (wxDataFormat::NativeFormat)::EnumClipboardFormats(dataFormat);
 508 }
 509
 510 int wxRegisterClipboardFormat(wxChar *formatName)
 511 {
 512   return ::RegisterClipboardFormat(formatName);
 513 }
 514
 515 bool wxGetClipboardFormatName(wxDataFormat dataFormat,
 516                               wxChar *formatName,
 517                               int maxCount)
 518 {
 519   return ::GetClipboardFormatName((int)dataFormat, formatName, maxCount) > 0;
 520 }
 521
 522 // ---------------------------------------------------------------------------
 523 // wxClipboard
 524 // ---------------------------------------------------------------------------
 525
 526 IMPLEMENT_DYNAMIC_CLASS(wxClipboard, wxObject)
 527
 528 wxClipboard::wxClipboard()
 529 {
 530 #if wxUSE_OLE_CLIPBOARD
 531     wxOleInitialize();
 532 #endif
 533
 534     m_clearOnExit = false;
 535     m_isOpened = false;
 536 }
 537
 538 wxClipboard::~wxClipboard()
 539 {
 540     if ( m_clearOnExit )
 541     {
 542         Clear();
 543     }
 544
 545 #if wxUSE_OLE_CLIPBOARD
 546     wxOleUninitialize();
 547 #endif
 548 }
 549
 550 void wxClipboard::Clear()
 551 {
 552 #if wxUSE_OLE_CLIPBOARD
 553     HRESULT hr = OleSetClipboard(NULL);
 554     if ( FAILED(hr) )
 555     {
 556         wxLogApiError(wxT("OleSetClipboard(NULL)"), hr);
 557     }
 558 #endif // wxUSE_OLE_CLIPBOARD
 559 }
 560
 561 bool wxClipboard::Flush()
 562 {
 563 #if wxUSE_OLE_CLIPBOARD
 564     HRESULT hr = OleFlushClipboard();
 565     if ( FAILED(hr) )
 566     {
 567         wxLogApiError(wxT("OleFlushClipboard"), hr);
 568
 569         return false;
 570     }
 571     else
 572     {
 573         m_clearOnExit = false;
 574
 575         return true;
 576     }
 577 #else // !wxUSE_OLE_CLIPBOARD
 578     return false;
 579 #endif // wxUSE_OLE_CLIPBOARD/!wxUSE_OLE_CLIPBOARD
 580 }
 581
 582 bool wxClipboard::Open()
 583 {
 584     // OLE opens clipboard for us
 585     m_isOpened = true;
 586 #if wxUSE_OLE_CLIPBOARD
 587     return true;
 588 #else
 589     return wxOpenClipboard();
 590 #endif
 591 }
 592
 593 bool wxClipboard::IsOpened() const
 594 {
 595 #if wxUSE_OLE_CLIPBOARD
 596     return m_isOpened;
 597 #else
 598     return wxIsClipboardOpened();
 599 #endif
 600 }
 601
 602 bool wxClipboard::SetData( wxDataObject *data )
 603 {
 604 #if !wxUSE_OLE_CLIPBOARD
 605     (void)wxEmptyClipboard();
 606 #endif // wxUSE_OLE_CLIPBOARD
 607
 608     if ( data )
 609         return AddData(data);
 610     else
 611         return true;
 612 }
 613
 614 bool wxClipboard::AddData( wxDataObject *data )
 615 {
 616     wxCHECK_MSG( data, false, wxT("data is invalid") );
 617
 618 #if wxUSE_OLE_CLIPBOARD
 619     HRESULT hr = OleSetClipboard(data->GetInterface());
 620     if ( FAILED(hr) )
 621     {
 622         wxLogSysError(hr, _("Failed to put data on the clipboard"));
 623
 624         // don't free anything in this case
 625
 626         return false;
 627     }
 628
 629     // we have a problem here because we should delete wxDataObject, but we
 630     // can't do it because IDataObject which we just gave to the clipboard
 631     // would try to use it when it will need the data. IDataObject is ref
 632     // counted and so doesn't suffer from such problem, so we release it now
 633     // and tell it to delete wxDataObject when it is deleted itself.
 634     data->SetAutoDelete();
 635
 636     // we have to call either OleSetClipboard(NULL) or OleFlushClipboard() when
 637     // using OLE clipboard when the app terminates - by default, we call
 638     // OleSetClipboard(NULL) which won't waste RAM, but the app can call
 639     // wxClipboard::Flush() to chaneg this
 640     m_clearOnExit = true;
 641
 642     return true;
 643 #elif wxUSE_DATAOBJ
 644     wxCHECK_MSG( wxIsClipboardOpened(), false, wxT("clipboard not open") );
 645
 646     wxDataFormat format = data->GetPreferredFormat();
 647
 648     switch ( format )
 649     {
 650         case wxDF_TEXT:
 651         case wxDF_OEMTEXT:
 652         {
 653             wxTextDataObject* textDataObject = (wxTextDataObject*) data;
 654             wxString str(textDataObject->GetText());
 655             return wxSetClipboardData(format, str.c_str());
 656         }
 657
 658         case wxDF_BITMAP:
 659         case wxDF_DIB:
 660         {
 661             wxBitmapDataObject* bitmapDataObject = (wxBitmapDataObject*) data;
 662             wxBitmap bitmap(bitmapDataObject->GetBitmap());
 663             return wxSetClipboardData(data->GetPreferredFormat(), &bitmap);
 664         }
 665
 666 #if wxUSE_METAFILE
 667         case wxDF_METAFILE:
 668         {
 669 #if 1
 670             // TODO
 671             wxLogError(wxT("Not implemented because wxMetafileDataObject does not contain width and height values."));
 672             return false;
 673 #else
 674             wxMetafileDataObject* metaFileDataObject =
 675                 (wxMetafileDataObject*) data;
 676             wxMetafile metaFile = metaFileDataObject->GetMetafile();
 677             return wxSetClipboardData(wxDF_METAFILE, &metaFile,
 678                                       metaFileDataObject->GetWidth(),
 679                                       metaFileDataObject->GetHeight());
 680 #endif
 681         }
 682 #endif // wxUSE_METAFILE
 683
 684         default:
 685         {
 686 // This didn't compile, of course
 687 //            return wxSetClipboardData(data);
 688             // TODO
 689             wxLogError(wxT("Not implemented."));
 690             return false;
 691         }
 692     }
 693 #else // !wxUSE_DATAOBJ
 694     return false;
 695 #endif // wxUSE_DATAOBJ/!wxUSE_DATAOBJ
 696 }
 697
 698 void wxClipboard::Close()
 699 {
 700     m_isOpened = false;
 701     // OLE closes clipboard for us
 702 #if !wxUSE_OLE_CLIPBOARD
 703     wxCloseClipboard();
 704 #endif
 705 }
 706
 707 bool wxClipboard::IsSupported( const wxDataFormat& format )
 708 {
 709     return wxIsClipboardFormatAvailable(format);
 710 }
 711
 712 bool wxClipboard::GetData( wxDataObject& data )
 713 {
 714 #if wxUSE_OLE_CLIPBOARD
 715     IDataObject *pDataObject = NULL;
 716     HRESULT hr = OleGetClipboard(&pDataObject);
 717     if ( FAILED(hr) || !pDataObject )
 718     {
 719         wxLogSysError(hr, _("Failed to get data from the clipboard"));
 720
 721         return false;
 722     }
 723
 724     // build the list of supported formats
 725     size_t nFormats = data.GetFormatCount(wxDataObject::Set);
 726     wxDataFormat format;
 727     wxDataFormat *formats;
 728     if ( nFormats == 1 )
 729     {
 730         // the most common case
 731         formats = &format;
 732     }
 733     else
 734     {
 735         // bad luck, need to alloc mem
 736         formats = new wxDataFormat[nFormats];
 737     }
 738
 739     data.GetAllFormats(formats, wxDataObject::Set);
 740
 741     // get the data for the given formats
 742     FORMATETC formatEtc;
 743     CLIPFORMAT cf;
 744     bool result = false;
 745
 746     // enumerate all explicit formats on the clipboard.
 747     // note that this does not include implicit / synthetic (automatically
 748     // converted) formats.
 749 #ifdef __WXDEBUG__
 750     // get the format enumerator
 751     IEnumFORMATETC *pEnumFormatEtc = NULL;
 752     hr = pDataObject->EnumFormatEtc(DATADIR_GET, &pEnumFormatEtc);
 753     if ( FAILED(hr) || !pEnumFormatEtc )
 754     {
 755         wxLogSysError(hr,
 756                       _("Failed to retrieve the supported clipboard formats"));
 757     }
 758     else
 759     {
 760         // ask for the supported formats and see if there are any we support
 761         for ( ;; )
 762         {
 763             ULONG nCount;
 764             hr = pEnumFormatEtc->Next(1, &formatEtc, &nCount);
 765
 766             // don't use FAILED() because S_FALSE would pass it
 767             if ( hr != S_OK )
 768             {
 769                 // no more formats
 770                 break;
 771             }
 772
 773             cf = formatEtc.cfFormat;
 774
 775             wxLogTrace(wxTRACE_OleCalls,
 776                        wxT("Object on the clipboard supports format %s."),
 777                        wxDataObject::GetFormatName(cf));
 778         }
 779
 780         pEnumFormatEtc->Release();
 781     }
 782 #endif // Debug
 783
 784     STGMEDIUM medium;
 785     // stop at the first valid format found on the clipboard
 786     for ( size_t n = 0; !result && (n < nFormats); n++ )
 787     {
 788         // convert to NativeFormat Id
 789         cf = formats[n].GetFormatId();
 790
 791         // if the format is not available, try the next one
 792         // this test includes implicit / sythetic formats
 793         if ( !::IsClipboardFormatAvailable(cf) )
 794             continue;
 795
 796         formatEtc.cfFormat = cf;
 797         formatEtc.ptd      = NULL;
 798         formatEtc.dwAspect = DVASPECT_CONTENT;
 799         formatEtc.lindex   = -1;
 800
 801         // use the appropriate tymed
 802         switch ( formatEtc.cfFormat )
 803         {
 804             case CF_BITMAP:
 805                 formatEtc.tymed = TYMED_GDI;
 806                 break;
 807
 808 #ifndef __WXWINCE__
 809             case CF_METAFILEPICT:
 810                 formatEtc.tymed = TYMED_MFPICT;
 811                 break;
 812
 813             case CF_ENHMETAFILE:
 814                 formatEtc.tymed = TYMED_ENHMF;
 815                 break;
 816 #endif
 817
 818             default:
 819                 formatEtc.tymed = TYMED_HGLOBAL;
 820         }
 821
 822         // try to get data
 823         hr = pDataObject->GetData(&formatEtc, &medium);
 824         if ( FAILED(hr) )
 825         {
 826             // try other tymed for GDI objects
 827             if ( formatEtc.cfFormat == CF_BITMAP )
 828             {
 829                 formatEtc.tymed = TYMED_HGLOBAL;
 830                 hr = pDataObject->GetData(&formatEtc, &medium);
 831             }
 832         }
 833
 834         if ( SUCCEEDED(hr) )
 835         {
 836             // pass the data to the data object
 837             hr = data.GetInterface()->SetData(&formatEtc, &medium, true);
 838             if ( FAILED(hr) )
 839             {
 840                 wxLogDebug(wxT("Failed to set data in wxIDataObject"));
 841
 842                 // IDataObject only takes the ownership of data if it
 843                 // successfully got it - which is not the case here
 844                 ReleaseStgMedium(&medium);
 845             }
 846             else
 847             {
 848                 result = true;
 849             }
 850         }
 851         //else: unsupported tymed?
 852     }
 853
 854     if ( formats != &format )
 855     {
 856         delete [] formats;
 857     }
 858     //else: we didn't allocate any memory
 859
 860     // clean up and return
 861     pDataObject->Release();
 862
 863     return result;
 864 #elif wxUSE_DATAOBJ
 865     wxCHECK_MSG( wxIsClipboardOpened(), false, wxT("clipboard not open") );
 866
 867     wxDataFormat format = data.GetPreferredFormat();
 868     switch ( format )
 869     {
 870         case wxDF_TEXT:
 871         case wxDF_OEMTEXT:
 872         {
 873             wxTextDataObject& textDataObject = (wxTextDataObject &)data;
 874             char* s = (char*)wxGetClipboardData(format);
 875             if ( !s )
 876                 return false;
 877
 878             textDataObject.SetText(wxString::FromAscii(s));
 879             delete [] s;
 880
 881             return true;
 882         }
 883
 884         case wxDF_BITMAP:
 885         case wxDF_DIB:
 886         {
 887             wxBitmapDataObject& bitmapDataObject = (wxBitmapDataObject &)data;
 888             wxBitmap* bitmap = (wxBitmap *)wxGetClipboardData(data.GetPreferredFormat());
 889             if ( !bitmap )
 890                 return false;
 891
 892             bitmapDataObject.SetBitmap(*bitmap);
 893             delete bitmap;
 894
 895             return true;
 896         }
 897 #if wxUSE_METAFILE
 898         case wxDF_METAFILE:
 899         {
 900             wxMetafileDataObject& metaFileDataObject = (wxMetafileDataObject &)data;
 901             wxMetafile* metaFile = (wxMetafile *)wxGetClipboardData(wxDF_METAFILE);
 902             if ( !metaFile )
 903                 return false;
 904
 905             metaFileDataObject.SetMetafile(*metaFile);
 906             delete metaFile;
 907
 908             return true;
 909         }
 910 #endif // wxUSE_METAFILE
 911     }
 912     return false;
 913 #else // !wxUSE_DATAOBJ
 914     wxFAIL_MSG( wxT("no clipboard implementation") );
 915     return false;
 916 #endif // wxUSE_OLE_CLIPBOARD/wxUSE_DATAOBJ
 917 }
 918
 919 #endif // wxUSE_CLIPBOARD
 920