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     CLIPFORMAT 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(__WIN16__) && !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                 HGLOBAL hDIB = wxDIB::ConvertFromBitmap(GetHbitmapOf(*bitmap));
 225                 if ( hDIB )
 226                 {
 227                     handle = ::SetClipboardData(CF_DIB, hDIB);
 228                 }
 229                 break;
 230             }
 231 #endif
 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 surprised if it did. So I leave it here
 235     //     but IMNSHO it is completely broken.
 236 #if wxUSE_METAFILE && !defined(wxMETAFILE_IS_ENH) && !defined(__WXWINCE__)
 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__) && !defined(__WXWINCE__)
 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 #ifndef __WXWINCE__
 394         case wxDF_BITMAP:
 395             {
 396                 BITMAP bm;
 397                 HBITMAP hBitmap = (HBITMAP) GetClipboardData(CF_BITMAP);
 398                 if (!hBitmap)
 399                     break;
 400
 401                 HDC hdcMem = CreateCompatibleDC((HDC) NULL);
 402                 HDC hdcSrc = CreateCompatibleDC((HDC) NULL);
 403
 404                 HBITMAP old = (HBITMAP) ::SelectObject(hdcSrc, hBitmap);
 405                 GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&bm);
 406
 407                 HBITMAP hNewBitmap = CreateBitmapIndirect(&bm);
 408
 409                 if (!hNewBitmap)
 410                 {
 411                     SelectObject(hdcSrc, old);
 412                     DeleteDC(hdcMem);
 413                     DeleteDC(hdcSrc);
 414                     break;
 415                 }
 416
 417                 HBITMAP old1 = (HBITMAP) SelectObject(hdcMem, hNewBitmap);
 418                 BitBlt(hdcMem, 0, 0, bm.bmWidth, bm.bmHeight,
 419                        hdcSrc, 0, 0, SRCCOPY);
 420
 421                 // Select new bitmap out of memory DC
 422                 SelectObject(hdcMem, old1);
 423
 424                 // Clean up
 425                 SelectObject(hdcSrc, old);
 426                 DeleteDC(hdcSrc);
 427                 DeleteDC(hdcMem);
 428
 429                 // Create and return a new wxBitmap
 430                 wxBitmap *wxBM = new wxBitmap;
 431                 wxBM->SetHBITMAP((WXHBITMAP) hNewBitmap);
 432                 wxBM->SetWidth(bm.bmWidth);
 433                 wxBM->SetHeight(bm.bmHeight);
 434                 wxBM->SetDepth(bm.bmPlanes);
 435                 retval = wxBM;
 436                 break;
 437             }
 438 #endif
 439         case wxDF_METAFILE:
 440         case CF_SYLK:
 441         case CF_DIF:
 442         case CF_TIFF:
 443         case CF_PALETTE:
 444         case wxDF_DIB:
 445             wxLogError(_("Unsupported clipboard format."));
 446             return NULL;
 447
 448         case wxDF_OEMTEXT:
 449             dataFormat = wxDF_TEXT;
 450             // fall through
 451
 452         case wxDF_TEXT:
 453             {
 454                 HANDLE hGlobalMemory = ::GetClipboardData(dataFormat);
 455                 if (!hGlobalMemory)
 456                     break;
 457
 458                 DWORD hsize = ::GlobalSize(hGlobalMemory);
 459                 if (len)
 460                     *len = hsize;
 461
 462                 char *s = new char[hsize];
 463                 if (!s)
 464                     break;
 465
 466                 LPSTR lpGlobalMemory = (LPSTR) GlobalLock(hGlobalMemory);
 467
 468                 memcpy(s, lpGlobalMemory, hsize);
 469
 470                 GlobalUnlock(hGlobalMemory);
 471
 472                 retval = s;
 473                 break;
 474             }
 475
 476         default:
 477             {
 478                 HANDLE hGlobalMemory = ::GetClipboardData(dataFormat);
 479                 if ( !hGlobalMemory )
 480                     break;
 481
 482                 DWORD size = ::GlobalSize(hGlobalMemory);
 483                 if ( len )
 484                     *len = size;
 485
 486                 void *buf = malloc(size);
 487                 if ( !buf )
 488                     break;
 489
 490                 LPSTR lpGlobalMemory = (LPSTR) GlobalLock(hGlobalMemory);
 491
 492                 memcpy(buf, lpGlobalMemory, size);
 493
 494                 GlobalUnlock(hGlobalMemory);
 495
 496                 retval = buf;
 497                 break;
 498             }
 499     }
 500
 501     if ( !retval )
 502     {
 503         wxLogSysError(_("Failed to retrieve data from the clipboard."));
 504     }
 505
 506     return retval;
 507 }
 508
 509 wxDataFormat wxEnumClipboardFormats(wxDataFormat dataFormat)
 510 {
 511   return (wxDataFormat::NativeFormat)::EnumClipboardFormats(dataFormat);
 512 }
 513
 514 int wxRegisterClipboardFormat(wxChar *formatName)
 515 {
 516   return ::RegisterClipboardFormat(formatName);
 517 }
 518
 519 bool wxGetClipboardFormatName(wxDataFormat dataFormat,
 520                               wxChar *formatName,
 521                               int maxCount)
 522 {
 523   return ::GetClipboardFormatName((int)dataFormat, formatName, maxCount) > 0;
 524 }
 525
 526 // ---------------------------------------------------------------------------
 527 // wxClipboard
 528 // ---------------------------------------------------------------------------
 529
 530 IMPLEMENT_DYNAMIC_CLASS(wxClipboard, wxObject)
 531
 532 wxClipboard::wxClipboard()
 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
 546 void wxClipboard::Clear()
 547 {
 548 #if wxUSE_OLE_CLIPBOARD
 549     if ( FAILED(OleSetClipboard(NULL)) )
 550     {
 551         wxLogLastError(wxT("OleSetClipboard(NULL)"));
 552     }
 553 #endif
 554 }
 555
 556 bool wxClipboard::Flush()
 557 {
 558 #if wxUSE_OLE_CLIPBOARD
 559     if ( FAILED(OleFlushClipboard()) )
 560     {
 561         wxLogLastError(wxT("OleFlushClipboard"));
 562
 563         return FALSE;
 564     }
 565     else
 566     {
 567         m_clearOnExit = FALSE;
 568
 569         return TRUE;
 570     }
 571 #else // !wxUSE_OLE_CLIPBOARD
 572     return FALSE;
 573 #endif // wxUSE_OLE_CLIPBOARD/!wxUSE_OLE_CLIPBOARD
 574 }
 575
 576 bool wxClipboard::Open()
 577 {
 578     // OLE opens clipboard for us
 579     m_isOpened = TRUE;
 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 m_isOpened;
 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(wxT("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     m_isOpened = FALSE;
 695     // OLE closes clipboard for us
 696 #if !wxUSE_OLE_CLIPBOARD
 697     wxCloseClipboard();
 698 #endif
 699 }
 700
 701 bool wxClipboard::IsSupported( wxDataFormat format )
 702 {
 703     return wxIsClipboardFormatAvailable(format);
 704 }
 705
 706 bool wxClipboard::GetData( wxDataObject& data )
 707 {
 708 #if wxUSE_OLE_CLIPBOARD
 709     IDataObject *pDataObject = NULL;
 710     HRESULT hr = OleGetClipboard(&pDataObject);
 711     if ( FAILED(hr) || !pDataObject )
 712     {
 713         wxLogSysError(hr, _("Failed to get data from the clipboard"));
 714
 715         return FALSE;
 716     }
 717
 718     // build the list of supported formats
 719     size_t nFormats = data.GetFormatCount(wxDataObject::Set);
 720     wxDataFormat format;
 721     wxDataFormat *formats;
 722     if ( nFormats == 1 )
 723     {
 724         // the most common case
 725         formats = &format;
 726     }
 727     else
 728     {
 729         // bad luck, need to alloc mem
 730         formats = new wxDataFormat[nFormats];
 731     }
 732
 733     data.GetAllFormats(formats, wxDataObject::Set);
 734
 735     // get the data for the given formats
 736     FORMATETC formatEtc;
 737     CLIPFORMAT cf;
 738     bool result = FALSE;
 739
 740     // enumerate all explicit formats on the clipboard.
 741     // note that this does not include implicit / synthetic (automatically
 742     // converted) formats.
 743 #ifdef __WXDEBUG__
 744     // get the format enumerator
 745     IEnumFORMATETC *pEnumFormatEtc = NULL;
 746     hr = pDataObject->EnumFormatEtc(DATADIR_GET, &pEnumFormatEtc);
 747     if ( FAILED(hr) || !pEnumFormatEtc )
 748     {
 749         wxLogSysError(hr,
 750                       _("Failed to retrieve the supported clipboard formats"));
 751     }
 752     else
 753     {
 754         // ask for the supported formats and see if there are any we support
 755         for ( ;; )
 756         {
 757             ULONG nCount;
 758             hr = pEnumFormatEtc->Next(1, &formatEtc, &nCount);
 759
 760             // don't use FAILED() because S_FALSE would pass it
 761             if ( hr != S_OK )
 762             {
 763                 // no more formats
 764                 break;
 765             }
 766
 767             cf = formatEtc.cfFormat;
 768
 769             wxLogTrace(wxTRACE_OleCalls,
 770                        wxT("Object on the clipboard supports format %s."),
 771                        wxDataObject::GetFormatName(cf));
 772         }
 773
 774         pEnumFormatEtc->Release();
 775     }
 776 #endif // Debug
 777
 778     STGMEDIUM medium;
 779     // stop at the first valid format found on the clipboard
 780     for ( size_t n = 0; !result && (n < nFormats); n++ )
 781     {
 782         // convert to NativeFormat Id
 783         cf = formats[n].GetFormatId();
 784
 785         // if the format is not available, try the next one
 786         // this test includes implicit / sythetic formats
 787         if ( !::IsClipboardFormatAvailable(cf) )
 788             continue;
 789
 790         formatEtc.cfFormat = cf;
 791         formatEtc.ptd      = NULL;
 792         formatEtc.dwAspect = DVASPECT_CONTENT;
 793         formatEtc.lindex   = -1;
 794
 795         // use the appropriate tymed
 796         switch ( formatEtc.cfFormat )
 797         {
 798             case CF_BITMAP:
 799                 formatEtc.tymed = TYMED_GDI;
 800                 break;
 801
 802 #ifndef __WXWINCE__
 803             case CF_METAFILEPICT:
 804                 formatEtc.tymed = TYMED_MFPICT;
 805                 break;
 806
 807             case CF_ENHMETAFILE:
 808                 formatEtc.tymed = TYMED_ENHMF;
 809                 break;
 810 #endif
 811
 812             default:
 813                 formatEtc.tymed = TYMED_HGLOBAL;
 814         }
 815
 816         // try to get data
 817         hr = pDataObject->GetData(&formatEtc, &medium);
 818         if ( FAILED(hr) )
 819         {
 820             // try other tymed for GDI objects
 821             if ( formatEtc.cfFormat == CF_BITMAP )
 822             {
 823                 formatEtc.tymed = TYMED_HGLOBAL;
 824                 hr = pDataObject->GetData(&formatEtc, &medium);
 825             }
 826         }
 827
 828         if ( SUCCEEDED(hr) )
 829         {
 830             // pass the data to the data object
 831             hr = data.GetInterface()->SetData(&formatEtc, &medium, TRUE);
 832             if ( FAILED(hr) )
 833             {
 834                 wxLogDebug(wxT("Failed to set data in wxIDataObject"));
 835
 836                 // IDataObject only takes the ownership of data if it
 837                 // successfully got it - which is not the case here
 838                 ReleaseStgMedium(&medium);
 839             }
 840             else
 841             {
 842                 result = TRUE;
 843             }
 844         }
 845         //else: unsupported tymed?
 846     }
 847
 848     if ( formats != &format )
 849     {
 850         delete [] formats;
 851     }
 852     //else: we didn't allocate any memory
 853
 854     // clean up and return
 855     pDataObject->Release();
 856
 857     return result;
 858 #elif wxUSE_DATAOBJ
 859     wxCHECK_MSG( wxIsClipboardOpened(), FALSE, wxT("clipboard not open") );
 860
 861     wxDataFormat format = data.GetPreferredFormat();
 862     switch ( format )
 863     {
 864         case wxDF_TEXT:
 865         case wxDF_OEMTEXT:
 866         {
 867             wxTextDataObject& textDataObject = (wxTextDataObject &)data;
 868             char* s = (char*)wxGetClipboardData(format);
 869             if ( !s )
 870                 return FALSE;
 871
 872             textDataObject.SetText(wxString::FromAscii(s));
 873             delete [] s;
 874
 875             return TRUE;
 876         }
 877
 878         case wxDF_BITMAP:
 879         case wxDF_DIB:
 880         {
 881             wxBitmapDataObject& bitmapDataObject = (wxBitmapDataObject &)data;
 882             wxBitmap* bitmap = (wxBitmap *)wxGetClipboardData(data.GetPreferredFormat());
 883             if ( !bitmap )
 884                 return FALSE;
 885
 886             bitmapDataObject.SetBitmap(*bitmap);
 887             delete bitmap;
 888
 889             return TRUE;
 890         }
 891 #if wxUSE_METAFILE
 892         case wxDF_METAFILE:
 893         {
 894             wxMetafileDataObject& metaFileDataObject = (wxMetafileDataObject &)data;
 895             wxMetafile* metaFile = (wxMetafile *)wxGetClipboardData(wxDF_METAFILE);
 896             if ( !metaFile )
 897                 return FALSE;
 898
 899             metaFileDataObject.SetMetafile(*metaFile);
 900             delete metaFile;
 901
 902             return TRUE;
 903         }
 904 #endif // wxUSE_METAFILE
 905     }
 906     return FALSE;
 907 #else // !wxUSE_DATAOBJ
 908     wxFAIL_MSG( wxT("no clipboard implementation") );
 909     return FALSE;
 910 #endif // wxUSE_OLE_CLIPBOARD/wxUSE_DATAOBJ
 911 }
 912
 913 #endif // wxUSE_CLIPBOARD
 914