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 #ifdef __GNUG__
  21     #pragma implementation "clipbrd.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 #ifndef WX_PRECOMP
  32     #include "wx/setup.h"
  33 #endif
  34
  35 #if wxUSE_CLIPBOARD
  36
  37 #ifndef WX_PRECOMP
  38     #include "wx/object.h"
  39     #include "wx/event.h"
  40     #include "wx/app.h"
  41     #include "wx/frame.h"
  42     #include "wx/bitmap.h"
  43     #include "wx/utils.h"
  44     #include "wx/intl.h"
  45 #endif
  46
  47 #if wxUSE_METAFILE
  48     #include "wx/metafile.h"
  49 #endif
  50
  51 #include "wx/log.h"
  52 #include "wx/clipbrd.h"
  53
  54 #include <string.h>
  55 #include <windows.h>
  56
  57 #include "wx/msw/private.h"
  58
  59 #ifndef __WXMICROWIN__
  60 #include "wx/msw/dib.h"
  61 #endif
  62
  63 // wxDataObject is tied to OLE/drag and drop implementation, therefore so are
  64 // the functions using wxDataObject in wxClipboard
  65 //#define wxUSE_DATAOBJ wxUSE_DRAG_AND_DROP
  66
  67 #if wxUSE_DATAOBJ
  68     #include "wx/dataobj.h"
  69 #endif
  70
  71 #if wxUSE_OLE
  72     // use OLE clipboard
  73     #define wxUSE_OLE_CLIPBOARD 1
  74 #else // !wxUSE_DATAOBJ
  75     // use Win clipboard API
  76     #define wxUSE_OLE_CLIPBOARD 0
  77 #endif
  78
  79 #if wxUSE_OLE_CLIPBOARD
  80     #include <ole2.h>
  81 #endif // wxUSE_OLE_CLIPBOARD
  82
  83 #ifdef __WIN16__
  84     #define memcpy hmemcpy
  85 #endif
  86
  87 // ===========================================================================
  88 // implementation
  89 // ===========================================================================
  90
  91 // ---------------------------------------------------------------------------
  92 // old-style clipboard functions using Windows API
  93 // ---------------------------------------------------------------------------
  94
  95 static bool gs_wxClipboardIsOpen = FALSE;
  96
  97 bool wxOpenClipboard()
  98 {
  99     wxCHECK_MSG( !gs_wxClipboardIsOpen, TRUE, wxT("clipboard already opened.") );
 100
 101     wxWindow *win = wxTheApp->GetTopWindow();
 102     if ( win )
 103     {
 104         gs_wxClipboardIsOpen = ::OpenClipboard((HWND)win->GetHWND()) != 0;
 105
 106         if ( !gs_wxClipboardIsOpen )
 107             wxLogSysError(_("Failed to open the clipboard."));
 108
 109         return gs_wxClipboardIsOpen;
 110     }
 111     else
 112     {
 113         wxLogDebug(wxT("Can not open clipboard without a main window."));
 114
 115         return FALSE;
 116     }
 117 }
 118
 119 bool wxCloseClipboard()
 120 {
 121     wxCHECK_MSG( gs_wxClipboardIsOpen, FALSE, wxT("clipboard is not opened") );
 122
 123     gs_wxClipboardIsOpen = FALSE;
 124
 125     if ( ::CloseClipboard() == 0 )
 126     {
 127         wxLogSysError(_("Failed to close the clipboard."));
 128
 129         return FALSE;
 130     }
 131
 132     return TRUE;
 133 }
 134
 135 bool wxEmptyClipboard()
 136 {
 137     if ( ::EmptyClipboard() == 0 )
 138     {
 139         wxLogSysError(_("Failed to empty the clipboard."));
 140
 141         return FALSE;
 142     }
 143
 144     return TRUE;
 145 }
 146
 147 bool wxIsClipboardOpened()
 148 {
 149   return gs_wxClipboardIsOpen;
 150 }
 151
 152 bool wxIsClipboardFormatAvailable(wxDataFormat dataFormat)
 153 {
 154     if ( ::IsClipboardFormatAvailable(dataFormat) )
 155     {
 156         // ok from the first try
 157         return TRUE;
 158     }
 159
 160     // for several standard formats, we can convert from some other ones too
 161     switch ( dataFormat.GetFormatId() )
 162     {
 163         // for bitmaps, DIBs will also do
 164         case CF_BITMAP:
 165             return ::IsClipboardFormatAvailable(CF_DIB) != 0;
 166
 167 #if wxUSE_ENH_METAFILE && !defined(__WIN16__)
 168         case CF_METAFILEPICT:
 169             return ::IsClipboardFormatAvailable(CF_ENHMETAFILE) != 0;
 170 #endif // wxUSE_ENH_METAFILE
 171
 172         default:
 173             return FALSE;
 174     }
 175 }
 176
 177 bool wxSetClipboardData(wxDataFormat dataFormat,
 178                         const void *data,
 179                         int width, int height)
 180 {
 181     HANDLE handle = 0; // return value of SetClipboardData
 182
 183     switch (dataFormat)
 184     {
 185         case wxDF_BITMAP:
 186             {
 187                 wxBitmap *bitmap = (wxBitmap *)data;
 188
 189                 HDC hdcMem = CreateCompatibleDC((HDC) NULL);
 190                 HDC hdcSrc = CreateCompatibleDC((HDC) NULL);
 191                 HBITMAP old = (HBITMAP)
 192                     ::SelectObject(hdcSrc, (HBITMAP)bitmap->GetHBITMAP());
 193                 HBITMAP hBitmap = CreateCompatibleBitmap(hdcSrc,
 194                                                          bitmap->GetWidth(),
 195                                                          bitmap->GetHeight());
 196                 if (!hBitmap)
 197                 {
 198                     SelectObject(hdcSrc, old);
 199                     DeleteDC(hdcMem);
 200                     DeleteDC(hdcSrc);
 201                     return FALSE;
 202                 }
 203
 204                 HBITMAP old1 = (HBITMAP) SelectObject(hdcMem, hBitmap);
 205                 BitBlt(hdcMem, 0, 0, bitmap->GetWidth(), bitmap->GetHeight(),
 206                        hdcSrc, 0, 0, SRCCOPY);
 207
 208                 // Select new bitmap out of memory DC
 209                 SelectObject(hdcMem, old1);
 210
 211                 // Set the data
 212                 handle = ::SetClipboardData(CF_BITMAP, hBitmap);
 213
 214                 // Clean up
 215                 SelectObject(hdcSrc, old);
 216                 DeleteDC(hdcSrc);
 217                 DeleteDC(hdcMem);
 218                 break;
 219             }
 220
 221         case wxDF_DIB:
 222             {
 223                 wxBitmap *bitmap = (wxBitmap *)data;
 224
 225                 HGLOBAL hDIB = wxDIB::ConvertFromBitmap(GetHbitmapOf(*bitmap));
 226                 if ( hDIB )
 227                 {
 228                     handle = ::SetClipboardData(CF_DIB, hDIB);
 229                 }
 230                 break;
 231             }
 232
 233     // VZ: I'm told that this code works, but it doesn't seem to work for me
 234     //     and, anyhow, I'd be highly surprized if it did. So I leave it here
 235     //     but IMNSHO it is completely broken.
 236 #if wxUSE_METAFILE && !defined(wxMETAFILE_IS_ENH)
 237         case wxDF_METAFILE:
 238             {
 239                 wxMetafile *wxMF = (wxMetafile *)data;
 240                 HANDLE data = GlobalAlloc(GHND, sizeof(METAFILEPICT) + 1);
 241                 METAFILEPICT *mf = (METAFILEPICT *)GlobalLock(data);
 242
 243                 mf->mm = wxMF->GetWindowsMappingMode();
 244                 mf->xExt = width;
 245                 mf->yExt = height;
 246                 mf->hMF = (HMETAFILE) wxMF->GetHMETAFILE();
 247                 GlobalUnlock(data);
 248                 wxMF->SetHMETAFILE((WXHANDLE) NULL);
 249
 250                 handle = SetClipboardData(CF_METAFILEPICT, data);
 251                 break;
 252             }
 253 #endif // wxUSE_METAFILE
 254
 255 #if wxUSE_ENH_METAFILE && !defined(__WIN16__)
 256         case wxDF_ENHMETAFILE:
 257             {
 258                 wxEnhMetaFile *emf = (wxEnhMetaFile *)data;
 259                 wxEnhMetaFile emfCopy = *emf;
 260
 261                 handle = SetClipboardData(CF_ENHMETAFILE,
 262                                           (void *)emfCopy.GetHENHMETAFILE());
 263             }
 264             break;
 265 #endif // wxUSE_ENH_METAFILE
 266
 267         case CF_SYLK:
 268         case CF_DIF:
 269         case CF_TIFF:
 270         case CF_PALETTE:
 271         default:
 272             {
 273                 wxLogError(_("Unsupported clipboard format."));
 274                 return FALSE;
 275             }
 276
 277         case wxDF_OEMTEXT:
 278             dataFormat = wxDF_TEXT;
 279             // fall through
 280
 281         case wxDF_TEXT:
 282             {
 283                 char *s = (char *)data;
 284
 285                 width = strlen(s) + 1;
 286                 height = 1;
 287                 DWORD l = (width * height);
 288                 HANDLE hGlobalMemory = GlobalAlloc(GHND, l);
 289                 if ( hGlobalMemory )
 290                 {
 291                     LPSTR lpGlobalMemory = (LPSTR)GlobalLock(hGlobalMemory);
 292
 293                     memcpy(lpGlobalMemory, s, l);
 294
 295                     GlobalUnlock(hGlobalMemory);
 296                 }
 297
 298                 handle = SetClipboardData(dataFormat, hGlobalMemory);
 299                 break;
 300             }
 301             // Only tested with non-Unicode, Visual C++ 6.0 so far
 302 #if defined(__VISUALC__) && !defined(UNICODE)
 303         case wxDF_HTML:
 304             {
 305                 char* html = (char *)data;
 306
 307                 // Create temporary buffer for HTML header...
 308                 char *buf = new char [400 + strlen(html)];
 309                 if(!buf) return FALSE;
 310
 311                 // Get clipboard id for HTML format...
 312                 static int cfid = 0;
 313                 if(!cfid) cfid = RegisterClipboardFormat(wxT("HTML Format"));
 314
 315                 // Create a template string for the HTML header...
 316                 strcpy(buf,
 317                     "Version:0.9\r\n"
 318                     "StartHTML:00000000\r\n"
 319                     "EndHTML:00000000\r\n"
 320                     "StartFragment:00000000\r\n"
 321                     "EndFragment:00000000\r\n"
 322                     "<html><body>\r\n"
 323                     "<!--StartFragment -->\r\n");
 324
 325                 // Append the HTML...
 326                 strcat(buf, html);
 327                 strcat(buf, "\r\n");
 328                 // Finish up the HTML format...
 329                 strcat(buf,
 330                     "<!--EndFragment-->\r\n"
 331                     "</body>\r\n"
 332                     "</html>");
 333
 334                 // Now go back, calculate all the lengths, and write out the
 335                 // necessary header information. Note, wsprintf() truncates the
 336                 // string when you overwrite it so you follow up with code to replace
 337                 // the 0 appended at the end with a '\r'...
 338                 char *ptr = strstr(buf, "StartHTML");
 339                 wsprintf(ptr+10, "%08u", strstr(buf, "<html>") - buf);
 340                 *(ptr+10+8) = '\r';
 341
 342                 ptr = strstr(buf, "EndHTML");
 343                 wsprintf(ptr+8, "%08u", strlen(buf));
 344                 *(ptr+8+8) = '\r';
 345
 346                 ptr = strstr(buf, "StartFragment");
 347                 wsprintf(ptr+14, "%08u", strstr(buf, "<!--StartFrag") - buf);
 348                 *(ptr+14+8) = '\r';
 349
 350                 ptr = strstr(buf, "EndFragment");
 351                 wsprintf(ptr+12, "%08u", strstr(buf, "<!--EndFrag") - buf);
 352                 *(ptr+12+8) = '\r';
 353
 354                 // Now you have everything in place ready to put on the
 355                 // clipboard.
 356
 357                 // Allocate global memory for transfer...
 358                 HGLOBAL hText = GlobalAlloc(GMEM_MOVEABLE |GMEM_DDESHARE, strlen(buf)+4);
 359
 360                 // Put your string in the global memory...
 361                 ptr = (char *)GlobalLock(hText);
 362                 strcpy(ptr, buf);
 363                 GlobalUnlock(hText);
 364
 365                 handle = ::SetClipboardData(cfid, hText);
 366
 367                 // Free memory...
 368                 GlobalFree(hText);
 369
 370                 // Clean up...
 371                 delete [] buf;
 372                 break;
 373             }
 374 #endif
 375     }
 376
 377     if ( handle == 0 )
 378     {
 379         wxLogSysError(_("Failed to set clipboard data."));
 380
 381         return FALSE;
 382     }
 383
 384     return TRUE;
 385 }
 386
 387 void *wxGetClipboardData(wxDataFormat dataFormat, long *len)
 388 {
 389     void *retval = NULL;
 390
 391     switch ( dataFormat )
 392     {
 393         case wxDF_BITMAP:
 394             {
 395                 BITMAP bm;
 396                 HBITMAP hBitmap = (HBITMAP) GetClipboardData(CF_BITMAP);
 397                 if (!hBitmap)
 398                     break;
 399
 400                 HDC hdcMem = CreateCompatibleDC((HDC) NULL);
 401                 HDC hdcSrc = CreateCompatibleDC((HDC) NULL);
 402
 403                 HBITMAP old = (HBITMAP) ::SelectObject(hdcSrc, hBitmap);
 404                 GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&bm);
 405
 406                 HBITMAP hNewBitmap = CreateBitmapIndirect(&bm);
 407
 408                 if (!hNewBitmap)
 409                 {
 410                     SelectObject(hdcSrc, old);
 411                     DeleteDC(hdcMem);
 412                     DeleteDC(hdcSrc);
 413                     break;
 414                 }
 415
 416                 HBITMAP old1 = (HBITMAP) SelectObject(hdcMem, hNewBitmap);
 417                 BitBlt(hdcMem, 0, 0, bm.bmWidth, bm.bmHeight,
 418                        hdcSrc, 0, 0, SRCCOPY);
 419
 420                 // Select new bitmap out of memory DC
 421                 SelectObject(hdcMem, old1);
 422
 423                 // Clean up
 424                 SelectObject(hdcSrc, old);
 425                 DeleteDC(hdcSrc);
 426                 DeleteDC(hdcMem);
 427
 428                 // Create and return a new wxBitmap
 429                 wxBitmap *wxBM = new wxBitmap;
 430                 wxBM->SetHBITMAP((WXHBITMAP) hNewBitmap);
 431                 wxBM->SetWidth(bm.bmWidth);
 432                 wxBM->SetHeight(bm.bmHeight);
 433                 wxBM->SetDepth(bm.bmPlanes);
 434 #if WXWIN_COMPATIBILITY_2
 435                 wxBM->SetOk(TRUE);
 436 #endif // WXWIN_COMPATIBILITY_2
 437                 retval = wxBM;
 438                 break;
 439             }
 440
 441         case wxDF_METAFILE:
 442         case CF_SYLK:
 443         case CF_DIF:
 444         case CF_TIFF:
 445         case CF_PALETTE:
 446         case wxDF_DIB:
 447             wxLogError(_("Unsupported clipboard format."));
 448             return NULL;
 449
 450         case wxDF_OEMTEXT:
 451             dataFormat = wxDF_TEXT;
 452             // fall through
 453
 454         case wxDF_TEXT:
 455             {
 456                 HANDLE hGlobalMemory = ::GetClipboardData(dataFormat);
 457                 if (!hGlobalMemory)
 458                     break;
 459
 460                 DWORD hsize = ::GlobalSize(hGlobalMemory);
 461                 if (len)
 462                     *len = hsize;
 463
 464                 char *s = new char[hsize];
 465                 if (!s)
 466                     break;
 467
 468                 LPSTR lpGlobalMemory = (LPSTR)::GlobalLock(hGlobalMemory);
 469
 470                 memcpy(s, lpGlobalMemory, hsize);
 471
 472                 ::GlobalUnlock(hGlobalMemory);
 473
 474                 retval = s;
 475                 break;
 476             }
 477
 478         default:
 479             {
 480                 HANDLE hGlobalMemory = ::GetClipboardData(dataFormat);
 481                 if ( !hGlobalMemory )
 482                     break;
 483
 484                 DWORD size = ::GlobalSize(hGlobalMemory);
 485                 if ( len )
 486                     *len = size;
 487
 488                 void *buf = malloc(size);
 489                 if ( !buf )
 490                     break;
 491
 492                 LPSTR lpGlobalMemory = (LPSTR)::GlobalLock(hGlobalMemory);
 493
 494                 memcpy(buf, lpGlobalMemory, size);
 495
 496                 ::GlobalUnlock(hGlobalMemory);
 497
 498                 retval = buf;
 499                 break;
 500             }
 501     }
 502
 503     if ( !retval )
 504     {
 505         wxLogSysError(_("Failed to retrieve data from the clipboard."));
 506     }
 507
 508     return retval;
 509 }
 510
 511 wxDataFormat wxEnumClipboardFormats(wxDataFormat dataFormat)
 512 {
 513   return (wxDataFormat::NativeFormat)::EnumClipboardFormats(dataFormat);
 514 }
 515
 516 int wxRegisterClipboardFormat(wxChar *formatName)
 517 {
 518   return ::RegisterClipboardFormat(formatName);
 519 }
 520
 521 bool wxGetClipboardFormatName(wxDataFormat dataFormat,
 522                               wxChar *formatName,
 523                               int maxCount)
 524 {
 525   return ::GetClipboardFormatName((int)dataFormat, formatName, maxCount) > 0;
 526 }
 527
 528 // ---------------------------------------------------------------------------
 529 // wxClipboard
 530 // ---------------------------------------------------------------------------
 531
 532 IMPLEMENT_DYNAMIC_CLASS(wxClipboard, wxObject)
 533
 534 wxClipboard::wxClipboard()
 535 {
 536     m_clearOnExit = FALSE;
 537 }
 538
 539 wxClipboard::~wxClipboard()
 540 {
 541     if ( m_clearOnExit )
 542     {
 543         Clear();
 544     }
 545 }
 546
 547 void wxClipboard::Clear()
 548 {
 549 #if wxUSE_OLE_CLIPBOARD
 550     if ( FAILED(OleSetClipboard(NULL)) )
 551     {
 552         wxLogLastError(wxT("OleSetClipboard(NULL)"));
 553     }
 554 #endif
 555 }
 556
 557 bool wxClipboard::Flush()
 558 {
 559 #if wxUSE_OLE_CLIPBOARD
 560     if ( FAILED(OleFlushClipboard()) )
 561     {
 562         wxLogLastError(wxT("OleFlushClipboard"));
 563
 564         return FALSE;
 565     }
 566     else
 567     {
 568         m_clearOnExit = FALSE;
 569
 570         return TRUE;
 571     }
 572 #else // !wxUSE_OLE_CLIPBOARD
 573     return FALSE;
 574 #endif // wxUSE_OLE_CLIPBOARD/!wxUSE_OLE_CLIPBOARD
 575 }
 576
 577 bool wxClipboard::Open()
 578 {
 579     // OLE opens clipboard for us
 580 #if wxUSE_OLE_CLIPBOARD
 581     return TRUE;
 582 #else
 583     return wxOpenClipboard();
 584 #endif
 585 }
 586
 587 bool wxClipboard::IsOpened() const
 588 {
 589 #if wxUSE_OLE_CLIPBOARD
 590     return TRUE;
 591 #else
 592     return wxIsClipboardOpened();
 593 #endif
 594 }
 595
 596 bool wxClipboard::SetData( wxDataObject *data )
 597 {
 598 #if !wxUSE_OLE_CLIPBOARD
 599     (void)wxEmptyClipboard();
 600 #endif // wxUSE_OLE_CLIPBOARD
 601
 602     if ( data )
 603         return AddData(data);
 604     else
 605         return TRUE;
 606 }
 607
 608 bool wxClipboard::AddData( wxDataObject *data )
 609 {
 610     wxCHECK_MSG( data, FALSE, wxT("data is invalid") );
 611
 612 #if wxUSE_OLE_CLIPBOARD
 613     HRESULT hr = OleSetClipboard(data->GetInterface());
 614     if ( FAILED(hr) )
 615     {
 616         wxLogSysError(hr, _("Failed to put data on the clipboard"));
 617
 618         // don't free anything in this case
 619
 620         return FALSE;
 621     }
 622
 623     // we have a problem here because we should delete wxDataObject, but we
 624     // can't do it because IDataObject which we just gave to the clipboard
 625     // would try to use it when it will need the data. IDataObject is ref
 626     // counted and so doesn't suffer from such problem, so we release it now
 627     // and tell it to delete wxDataObject when it is deleted itself.
 628     data->SetAutoDelete();
 629
 630     // we have to call either OleSetClipboard(NULL) or OleFlushClipboard() when
 631     // using OLE clipboard when the app terminates - by default, we call
 632     // OleSetClipboard(NULL) which won't waste RAM, but the app can call
 633     // wxClipboard::Flush() to chaneg this
 634     m_clearOnExit = TRUE;
 635
 636     return TRUE;
 637 #elif wxUSE_DATAOBJ
 638     wxCHECK_MSG( wxIsClipboardOpened(), FALSE, wxT("clipboard not open") );
 639
 640     wxDataFormat format = data->GetPreferredFormat();
 641
 642     switch ( format )
 643     {
 644         case wxDF_TEXT:
 645         case wxDF_OEMTEXT:
 646         {
 647             wxTextDataObject* textDataObject = (wxTextDataObject*) data;
 648             wxString str(textDataObject->GetText());
 649             return wxSetClipboardData(format, str.c_str());
 650         }
 651
 652         case wxDF_BITMAP:
 653         case wxDF_DIB:
 654         {
 655             wxBitmapDataObject* bitmapDataObject = (wxBitmapDataObject*) data;
 656             wxBitmap bitmap(bitmapDataObject->GetBitmap());
 657             return wxSetClipboardData(data->GetPreferredFormat(), &bitmap);
 658         }
 659
 660 #if wxUSE_METAFILE
 661         case wxDF_METAFILE:
 662         {
 663 #if 1
 664             // TODO
 665             wxLogError("Not implemented because wxMetafileDataObject does not contain width and height values.");
 666             return FALSE;
 667 #else
 668             wxMetafileDataObject* metaFileDataObject =
 669                 (wxMetafileDataObject*) data;
 670             wxMetafile metaFile = metaFileDataObject->GetMetafile();
 671             return wxSetClipboardData(wxDF_METAFILE, &metaFile,
 672                                       metaFileDataObject->GetWidth(),
 673                                       metaFileDataObject->GetHeight());
 674 #endif
 675         }
 676 #endif // wxUSE_METAFILE
 677
 678         default:
 679         {
 680 // This didn't compile, of course
 681 //            return wxSetClipboardData(data);
 682             // TODO
 683             wxLogError("Not implemented.");
 684             return FALSE;
 685         }
 686     }
 687 #else // !wxUSE_DATAOBJ
 688     return FALSE;
 689 #endif // wxUSE_DATAOBJ/!wxUSE_DATAOBJ
 690 }
 691
 692 void wxClipboard::Close()
 693 {
 694     // OLE closes clipboard for us
 695 #if !wxUSE_OLE_CLIPBOARD
 696     wxCloseClipboard();
 697 #endif
 698 }
 699
 700 bool wxClipboard::IsSupported( wxDataFormat format )
 701 {
 702     return wxIsClipboardFormatAvailable(format);
 703 }
 704
 705 bool wxClipboard::GetData( wxDataObject& data )
 706 {
 707 #if wxUSE_OLE_CLIPBOARD
 708     IDataObject *pDataObject = NULL;
 709     HRESULT hr = OleGetClipboard(&pDataObject);
 710     if ( FAILED(hr) || !pDataObject )
 711     {
 712         wxLogSysError(hr, _("Failed to get data from the clipboard"));
 713
 714         return FALSE;
 715     }
 716
 717     // build the list of supported formats
 718     size_t nFormats = data.GetFormatCount(wxDataObject::Set);
 719     wxDataFormat format;
 720     wxDataFormat *formats;
 721     if ( nFormats == 1 )
 722     {
 723         // the most common case
 724         formats = &format;
 725     }
 726     else
 727     {
 728         // bad luck, need to alloc mem
 729         formats = new wxDataFormat[nFormats];
 730     }
 731
 732     data.GetAllFormats(formats, wxDataObject::Set);
 733
 734     // get the format enumerator
 735     bool result = FALSE;
 736     wxArrayInt supportedFormats;
 737     IEnumFORMATETC *pEnumFormatEtc = NULL;
 738     hr = pDataObject->EnumFormatEtc(DATADIR_GET, &pEnumFormatEtc);
 739     if ( FAILED(hr) || !pEnumFormatEtc )
 740     {
 741         wxLogSysError(hr,
 742                       _("Failed to retrieve the supported clipboard formats"));
 743     }
 744     else
 745     {
 746         // ask for the supported formats and see if there are any we support
 747         FORMATETC formatEtc;
 748         for ( ;; )
 749         {
 750             ULONG nCount;
 751             hr = pEnumFormatEtc->Next(1, &formatEtc, &nCount);
 752
 753             // don't use FAILED() because S_FALSE would pass it
 754             if ( hr != S_OK )
 755             {
 756                 // no more formats
 757                 break;
 758             }
 759
 760             CLIPFORMAT cf = formatEtc.cfFormat;
 761
 762 #ifdef __WXDEBUG__
 763             wxLogTrace(wxTRACE_OleCalls,
 764                        wxT("Object on the clipboard supports format %s."),
 765                        wxDataObject::GetFormatName(cf));
 766 #endif // Debug
 767
 768             // is supported?
 769             for ( size_t n = 0; n < nFormats; n++ )
 770             {
 771                 if ( formats[n].GetFormatId() == cf )
 772                 {
 773                     if ( supportedFormats.Index(cf) == wxNOT_FOUND )
 774                     {
 775                         supportedFormats.Add(cf);
 776                     }
 777                 }
 778             }
 779         }
 780
 781         pEnumFormatEtc->Release();
 782     }
 783
 784     if ( formats != &format )
 785     {
 786         delete [] formats;
 787     }
 788     //else: we didn't allocate any memory
 789
 790     if ( !supportedFormats.IsEmpty() )
 791     {
 792         FORMATETC formatEtc;
 793         formatEtc.ptd      = NULL;
 794         formatEtc.dwAspect = DVASPECT_CONTENT;
 795         formatEtc.lindex   = -1;
 796
 797         size_t nSupportedFormats = supportedFormats.GetCount();
 798         for ( size_t n = 0; !result && (n < nSupportedFormats); n++ )
 799         {
 800             STGMEDIUM medium;
 801             formatEtc.cfFormat = supportedFormats[n];
 802
 803             // use the appropriate tymed
 804             switch ( formatEtc.cfFormat )
 805             {
 806                 case CF_BITMAP:
 807                     formatEtc.tymed = TYMED_GDI;
 808                     break;
 809
 810                 case CF_METAFILEPICT:
 811                     formatEtc.tymed = TYMED_MFPICT;
 812                     break;
 813
 814                 case CF_ENHMETAFILE:
 815                     formatEtc.tymed = TYMED_ENHMF;
 816                     break;
 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     //else: unsupported format
 855
 856     // clean up and return
 857     pDataObject->Release();
 858
 859     return result;
 860 #elif wxUSE_DATAOBJ
 861     wxCHECK_MSG( wxIsClipboardOpened(), FALSE, wxT("clipboard not open") );
 862
 863     wxDataFormat format = data.GetPreferredFormat();
 864     switch ( format )
 865     {
 866         case wxDF_TEXT:
 867         case wxDF_OEMTEXT:
 868         {
 869             wxTextDataObject& textDataObject = (wxTextDataObject &)data;
 870             char* s = (char*)wxGetClipboardData(format);
 871             if ( !s )
 872                 return FALSE;
 873
 874             textDataObject.SetText(s);
 875             delete [] s;
 876
 877             return TRUE;
 878         }
 879
 880         case wxDF_BITMAP:
 881         case wxDF_DIB:
 882         {
 883             wxBitmapDataObject& bitmapDataObject = (wxBitmapDataObject &)data;
 884             wxBitmap* bitmap = (wxBitmap *)wxGetClipboardData(data.GetPreferredFormat());
 885             if ( !bitmap )
 886                 return FALSE;
 887
 888             bitmapDataObject.SetBitmap(*bitmap);
 889             delete bitmap;
 890
 891             return TRUE;
 892         }
 893 #if wxUSE_METAFILE
 894         case wxDF_METAFILE:
 895         {
 896             wxMetafileDataObject& metaFileDataObject = (wxMetafileDataObject &)data;
 897             wxMetafile* metaFile = (wxMetafile *)wxGetClipboardData(wxDF_METAFILE);
 898             if ( !metaFile )
 899                 return FALSE;
 900
 901             metaFileDataObject.SetMetafile(*metaFile);
 902             delete metaFile;
 903
 904             return TRUE;
 905         }
 906 #endif // wxUSE_METAFILE
 907     }
 908     return FALSE;
 909 #else // !wxUSE_DATAOBJ
 910     wxFAIL_MSG( wxT("no clipboard implementation") );
 911     return FALSE;
 912 #endif // wxUSE_OLE_CLIPBOARD/wxUSE_DATAOBJ
 913 }
 914
 915 #endif // wxUSE_CLIPBOARD
 916