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