src/os2/utils.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        utils.cpp
   3 // Purpose:     Various utilities
   4 // Author:      David Webster
   5 // Modified by:
   6 // Created:     09/17/99
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) David Webster
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // For compilers that support precompilation, includes "wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #ifndef WX_PRECOMP
  16     #include "wx/setup.h"
  17     #include "wx/utils.h"
  18     #include "wx/app.h"
  19     #include "wx/cursor.h"
  20 #endif  //WX_PRECOMP
  21
  22 #include "wx/os2/private.h"
  23 #include "wx/timer.h"
  24 #include "wx/intl.h"
  25
  26 #include <ctype.h>
  27 #include <direct.h>
  28
  29 #include "wx/log.h"
  30
  31 #include <io.h>
  32
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <string.h>
  36 #include <errno.h>
  37 #include <stdarg.h>
  38
  39 #define INCL_DOS
  40 #define INCL_PM
  41 #define INCL_GPI
  42 #include <os2.h>
  43 #define PURE_32
  44 #include <upm.h>
  45 #include <netcons.h>
  46 #include <netbios.h>
  47
  48 static const wxChar WX_SECTION[] = _T("wxWindows");
  49 static const wxChar eHOSTNAME[]  = _T("HostName");
  50 static const wxChar eUSERID[]    = _T("UserId");
  51 static const wxChar eUSERNAME[]  = _T("UserName");
  52
  53 // For the following functions we SHOULD fill in support
  54 // for Windows-NT (which I don't know) as I assume it begin
  55 // a POSIX Unix (so claims MS) that it has some special
  56 // functions beyond those provided by WinSock
  57
  58 // Get full hostname (eg. DoDo.BSn-Germany.crg.de)
  59 bool wxGetHostName(
  60   wxChar*                           zBuf
  61 , int                               nMaxSize
  62 )
  63 {
  64 #if wxUSE_NET_API
  65     char                            zServer[256];
  66     char                            zComputer[256];
  67     unsigned long                   ulLevel = 0;
  68     unsigned char*                  zBuffer;
  69     unsigned long                   ulBuffer;
  70     unsigned long*                  pulTotalAvail;
  71
  72     NetBios32GetInfo( (const unsigned char*)zServer
  73                      ,(const unsigned char*)zComputer
  74                      ,ulLevel
  75                      ,zBuffer
  76                      ,ulBuffer
  77                      ,pulTotalAvail
  78                     );
  79     strcpy(zBuf, zServer);
  80 #else
  81     wxChar*                         zSysname;
  82     const wxChar*                   zDefaultHost = _T("noname");
  83
  84     if ((zSysname = wxGetenv(_T("SYSTEM_NAME"))) == NULL)
  85     {
  86         ULONG n = ::PrfQueryProfileString( HINI_PROFILE
  87                                           ,(PSZ)WX_SECTION
  88                                           ,(PSZ)eHOSTNAME
  89                                           ,(PSZ)zDefaultHost
  90                                           ,(void*)zBuf
  91                                           ,(ULONG)nMaxSize - 1
  92                                          );
  93     }
  94     else
  95         wxStrncpy(zBuf, zSysname, nMaxSize - 1);
  96     zBuf[nMaxSize] = _T('\0');
  97 #endif
  98     return *zBuf ? TRUE : FALSE;
  99 }
 100
 101 // Get user ID e.g. jacs
 102 bool wxGetUserId(
 103   wxChar*                           zBuf
 104 , int                               nType
 105 )
 106 {
 107     long                            lrc;
 108     // UPM procs return 0 on success
 109     lrc = U32ELOCU((unsigned char*)zBuf, (unsigned long *)&nType);
 110     if (lrc == 0) return TRUE;
 111     return FALSE;
 112 }
 113
 114 bool wxGetUserName(
 115   wxChar*                           zBuf
 116 , int                               nMaxSize
 117 )
 118 {
 119 #ifdef USE_NET_API
 120     wxGetUserId( zBuf
 121                 ,nMaxSize
 122                );
 123 #else
 124     wxStrncpy(zBuf, _T("Unknown User"), nMaxSize);
 125 #endif
 126     return TRUE;
 127 }
 128
 129 int wxKill(
 130   long                              lPid
 131 , int                               nSig
 132 )
 133 {
 134     return((int)::DosKillProcess(0, (PID)lPid));
 135 }
 136
 137 //
 138 // Execute a program in an Interactive Shell
 139 //
 140 bool wxShell(
 141   const wxString&                   rCommand
 142 )
 143 {
 144     wxChar*                         zShell = _T("CMD.EXE");
 145     wxString                        sInputs;
 146     wxChar                          zTmp[255];
 147     STARTDATA                       SData = {0};
 148     PSZ                             PgmTitle = "Command Shell";
 149     APIRET                          rc;
 150     PID                             vPid = 0;
 151     ULONG                           ulSessID = 0;
 152     UCHAR                           achObjBuf[256] = {0}; //error data if DosStart fails
 153     RESULTCODES                     vResult;
 154
 155     SData.Length   = sizeof(STARTDATA);
 156     SData.Related  = SSF_RELATED_INDEPENDENT;
 157     SData.FgBg     = SSF_FGBG_FORE;
 158     SData.TraceOpt = SSF_TRACEOPT_NONE;
 159     SData.PgmTitle = PgmTitle;
 160     SData.PgmName  = zShell;
 161
 162     sInputs = "/C " + rCommand;
 163     SData.PgmInputs     = NULL; //(BYTE*)sInputs.c_str();
 164     SData.TermQ         = 0;
 165     SData.Environment   = 0;
 166     SData.InheritOpt    = SSF_INHERTOPT_SHELL;
 167     SData.SessionType   = SSF_TYPE_WINDOWABLEVIO;
 168     SData.IconFile      = 0;
 169     SData.PgmHandle     = 0;
 170     SData.PgmControl    = SSF_CONTROL_VISIBLE | SSF_CONTROL_MAXIMIZE;
 171     SData.InitXPos      = 30;
 172     SData.InitYPos      = 40;
 173     SData.InitXSize     = 200;
 174     SData.InitYSize     = 140;
 175     SData.Reserved      = 0;
 176     SData.ObjectBuffer  = (char*)achObjBuf;
 177     SData.ObjectBuffLen = (ULONG)sizeof(achObjBuf);
 178
 179     rc = ::DosStartSession(&SData, &ulSessID, &vPid);
 180     if (rc == 0)
 181     {
 182         PTIB                            ptib;
 183         PPIB                            ppib;
 184
 185         ::DosGetInfoBlocks(&ptib, &ppib);
 186
 187         ::DosWaitChild( DCWA_PROCESS
 188                        ,DCWW_WAIT
 189                        ,&vResult
 190                        ,&ppib->pib_ulpid
 191                        ,vPid
 192                       );
 193     }
 194     return (rc != 0);
 195 }
 196
 197 // Get free memory in bytes, or -1 if cannot determine amount (e.g. on UNIX)
 198 long wxGetFreeMemory(
 199   void*                             pMemptr
 200 )
 201 {
 202     ULONG                           lSize;
 203     ULONG                           lMemFlags;
 204     APIRET                          rc;
 205
 206     lMemFlags = PAG_FREE;
 207     rc = ::DosQueryMem(pMemptr, &lSize, &lMemFlags);
 208     if (rc != 0)
 209         return -1L;
 210     return (long)lSize;
 211 }
 212
 213 // Sleep for nSecs seconds. Attempt a Windows implementation using timers.
 214 static bool inTimer = FALSE;
 215
 216 class wxSleepTimer: public wxTimer
 217 {
 218 public:
 219     inline void Notify()
 220     {
 221         inTimer = FALSE;
 222         Stop();
 223     }
 224 };
 225
 226 static wxTimer*                     wxTheSleepTimer = NULL;
 227
 228 void wxUsleep(
 229   unsigned long                     ulMilliseconds
 230 )
 231 {
 232     ::DosSleep(ulMilliseconds);
 233 }
 234
 235 void wxSleep(
 236   int                               nSecs
 237 )
 238 {
 239     ::DosSleep(1000 * nSecs);
 240 }
 241
 242 // Consume all events until no more left
 243 void wxFlushEvents()
 244 {
 245 //  wxYield();
 246 }
 247
 248 // Output a debug mess., in a system dependent fashion.
 249 void wxDebugMsg(
 250   const wxChar*                     zFmt ...
 251 )
 252 {
 253     va_list                         vAp;
 254     static wxChar                   zBuffer[512];
 255
 256     if (!wxTheApp->GetWantDebugOutput())
 257         return ;
 258     va_start(vAp, zFmt);
 259     sprintf(zBuffer, zFmt, vAp) ;
 260     va_end(vAp);
 261 }
 262
 263 // Non-fatal error: pop up message box and (possibly) continue
 264 void wxError(
 265   const wxString&                   rMsg
 266 , const wxString&                   rTitle
 267 )
 268 {
 269     wxSprintf(wxBuffer, "%s\nContinue?", WXSTRINGCAST rMsg);
 270     if (::WinMessageBox( HWND_DESKTOP
 271                         ,NULL
 272                         ,(PSZ)wxBuffer
 273                         ,(PSZ)WXSTRINGCAST rTitle
 274                         ,0
 275                         ,MB_ICONEXCLAMATION | MB_YESNO
 276                        ) == MBID_YES)
 277     wxExit();
 278 }
 279
 280 // Fatal error: pop up message box and abort
 281 void wxFatalError(
 282   const wxString&                   rMsg
 283 , const wxString&                   rTitle
 284 )
 285 {
 286     unsigned long                   ulRc;
 287
 288     ulRc = ::WinMessageBox( HWND_DESKTOP
 289                            ,NULL
 290                            ,WXSTRINGCAST rMsg
 291                            ,WXSTRINGCAST rTitle
 292                            ,0
 293                            ,MB_NOICON | MB_OK
 294                           );
 295     DosExit(EXIT_PROCESS, ulRc);
 296 }
 297
 298 // Emit a beeeeeep
 299 void wxBell()
 300 {
 301     DosBeep(1000,1000); // 1kHz during 1 sec.
 302 }
 303
 304 // Chris Breeze 27/5/98: revised WIN32 code to
 305 // detect WindowsNT correctly
 306 int wxGetOsVersion(
 307   int*                              pMajorVsn
 308 , int*                              pMinorVsn
 309 )
 310 {
 311     ULONG                           ulSysInfo[QSV_MAX] = {0};
 312
 313     if (::DosQuerySysInfo( 1L
 314                           ,QSV_MAX
 315                           ,(PVOID)ulSysInfo
 316                           ,sizeof(ULONG) * QSV_MAX
 317                          ))
 318     {
 319         *pMajorVsn = ulSysInfo[QSV_VERSION_MAJOR];
 320         *pMinorVsn = ulSysInfo[QSV_VERSION_MINOR];
 321         return wxWINDOWS_OS2;
 322     }
 323     return wxWINDOWS; // error if we get here, return generic value
 324 }
 325
 326 // Reading and writing resources (eg WIN.INI, .Xdefaults)
 327 #if wxUSE_RESOURCES
 328 bool wxWriteResource(
 329   const wxString&                   rSection
 330 , const wxString&                   rEntry
 331 , const wxString&                   rValue
 332 , const wxString&                   rFile
 333 )
 334 {
 335     HAB                             hab;
 336     HINI                            hIni;
 337
 338     if (rFile != "")
 339     {
 340         hIni = ::PrfOpenProfile(hab, (PSZ)WXSTRINGCAST rFile);
 341         if (hIni != 0L)
 342         {
 343             return (::PrfWriteProfileString( hIni
 344                                             ,(PSZ)WXSTRINGCAST rSection
 345                                             ,(PSZ)WXSTRINGCAST rEntry
 346                                             ,(PSZ)WXSTRINGCAST rValue
 347                                            ));
 348         }
 349     }
 350     else
 351         return (::PrfWriteProfileString( HINI_PROFILE
 352                                         ,(PSZ)WXSTRINGCAST rSection
 353                                         ,(PSZ)WXSTRINGCAST rEntry
 354                                         ,(PSZ)WXSTRINGCAST rValue
 355                                        ));
 356     return FALSE;
 357 }
 358
 359 bool wxWriteResource(
 360   const wxString&                   rSection
 361 , const wxString&                   rEntry
 362 , float                             fValue
 363 , const wxString&                   rFile
 364 )
 365 {
 366     wxChar                          zBuf[50];
 367
 368     wxSprintf(zBuf, "%.4f", fValue);
 369     return wxWriteResource( rSection
 370                            ,rEntry
 371                            ,zBuf
 372                            ,rFile
 373                           );
 374 }
 375
 376 bool wxWriteResource(
 377   const wxString&                   rSection
 378 , const wxString&                   rEntry
 379 , long                              lValue
 380 , const wxString&                   rFile
 381 )
 382 {
 383     wxChar                          zBuf[50];
 384
 385     wxSprintf(zBuf, "%ld", lValue);
 386     return wxWriteResource( rSection
 387                            ,rEntry
 388                            ,zBuf
 389                            ,rFile
 390                           );
 391 }
 392
 393 bool wxWriteResource(
 394   const wxString&                   rSection
 395 , const wxString&                   rEntry
 396 , int                               lValue
 397 , const wxString&                   rFile
 398 )
 399 {
 400     wxChar                          zBuf[50];
 401
 402     wxSprintf(zBuf, "%d", lValue);
 403     return wxWriteResource( rSection
 404                            ,rEntry
 405                            ,zBuf
 406                            ,rFile
 407                           );
 408 }
 409
 410 bool wxGetResource(
 411   const wxString&                   rSection
 412 , const wxString&                   rEntry
 413 , wxChar**                          ppValue
 414 , const wxString&                   rFile
 415 )
 416 {
 417     HAB                             hab;
 418     HINI                            hIni;
 419     static const wxChar             zDefunkt[] = _T("$$default");
 420
 421     if (rFile != "")
 422     {
 423         hIni = ::PrfOpenProfile(hab, (PSZ)WXSTRINGCAST rFile);
 424         if (hIni != 0L)
 425         {
 426             ULONG n = ::PrfQueryProfileString( hIni
 427                                               ,(PSZ)WXSTRINGCAST rSection
 428                                               ,(PSZ)WXSTRINGCAST rEntry
 429                                               ,(PSZ)zDefunkt
 430                                               ,(void*)wxBuffer
 431                                               ,1000
 432                                              );
 433             if (n == 0L || wxStrcmp(wxBuffer, zDefunkt) == 0)
 434                 return FALSE;
 435         }
 436         else
 437             return FALSE;
 438     }
 439     else
 440     {
 441         ULONG n = ::PrfQueryProfileString( HINI_PROFILE
 442                                           ,(PSZ)WXSTRINGCAST rSection
 443                                           ,(PSZ)WXSTRINGCAST rEntry
 444                                           ,(PSZ)zDefunkt
 445                                           ,(void*)wxBuffer
 446                                           ,1000
 447                                          );
 448         if (n == 0L || wxStrcmp(wxBuffer, zDefunkt) == 0)
 449             return FALSE;
 450     }
 451     if (*ppValue)
 452         delete[] (*ppValue);
 453     *ppValue = copystring(wxBuffer);
 454     return TRUE;
 455 }
 456
 457 bool wxGetResource(
 458   const wxString&                   rSection
 459 , const wxString&                   rEntry
 460 , float*                            pValue
 461 , const wxString&                   rFile
 462 )
 463 {
 464     wxChar*                         zStr = NULL;
 465     bool                            bSucc = wxGetResource( rSection
 466                                                           ,rEntry
 467                                                           ,(wxChar **)&zStr
 468                                                           ,rFile
 469                                                          );
 470
 471     if (bSucc)
 472     {
 473         *pValue = (float)wxStrtod(zStr, NULL);
 474         delete[] zStr;
 475         return TRUE;
 476     }
 477     else return FALSE;
 478 }
 479
 480 bool wxGetResource(
 481   const wxString&                   rSection
 482 , const wxString&                   rEntry
 483 , long*                             pValue
 484 , const wxString&                   rFile
 485 )
 486 {
 487     wxChar*                           zStr = NULL;
 488     bool                              bSucc = wxGetResource( rSection
 489                                                             ,rEntry
 490                                                             ,(wxChar **)&zStr
 491                                                             ,rFile
 492                                                            );
 493
 494     if (bSucc)
 495     {
 496         *pValue = wxStrtol(zStr, NULL, 10);
 497         delete[] zStr;
 498         return TRUE;
 499     }
 500     else return FALSE;
 501 }
 502
 503 bool wxGetResource(
 504   const wxString&                   rSection
 505 , const wxString&                   rEntry
 506 , int*                              pValue
 507 , const wxString&                   rFile
 508 )
 509 {
 510     wxChar*                         zStr = NULL;
 511     bool                            bSucc = wxGetResource( rSection
 512                                                           ,rEntry
 513                                                           ,(wxChar **)&zStr
 514                                                           ,rFile
 515                                                          );
 516
 517     if (bSucc)
 518     {
 519         *pValue = (int)wxStrtol(zStr, NULL, 10);
 520         delete[] zStr;
 521         return TRUE;
 522     }
 523     else return FALSE;
 524 }
 525 #endif // wxUSE_RESOURCES
 526
 527 // ---------------------------------------------------------------------------
 528 // helper functions for showing a "busy" cursor
 529 // ---------------------------------------------------------------------------
 530
 531 HCURSOR gs_wxBusyCursor = 0;     // new, busy cursor
 532 HCURSOR gs_wxBusyCursorOld = 0;  // old cursor
 533 static int gs_wxBusyCursorCount = 0;
 534
 535 // Set the cursor to the busy cursor for all windows
 536 void wxBeginBusyCursor(
 537   wxCursor*                         pCursor
 538 )
 539 {
 540     if ( gs_wxBusyCursorCount++ == 0 )
 541     {
 542         gs_wxBusyCursor = (HCURSOR)pCursor->GetHCURSOR();
 543         ::WinSetPointer(HWND_DESKTOP, (HPOINTER)gs_wxBusyCursor);
 544     }
 545     //else: nothing to do, already set
 546 }
 547
 548 // Restore cursor to normal
 549 void wxEndBusyCursor()
 550 {
 551     wxCHECK_RET( gs_wxBusyCursorCount > 0
 552                 ,_T("no matching wxBeginBusyCursor() for wxEndBusyCursor()")
 553                );
 554
 555     if (--gs_wxBusyCursorCount == 0)
 556     {
 557         ::WinSetPointer(HWND_DESKTOP, (HPOINTER)gs_wxBusyCursorOld);
 558         gs_wxBusyCursorOld = 0;
 559     }
 560 }
 561
 562 // TRUE if we're between the above two calls
 563 bool wxIsBusy()
 564 {
 565     return (gs_wxBusyCursorCount > 0);
 566 }
 567
 568 // ---------------------------------------------------------------------------
 569 const wxChar* wxGetHomeDir(
 570   wxString*                         pStr
 571 )
 572 {
 573     wxString&                       rStrDir = *pStr;
 574
 575     // OS/2 has no idea about home,
 576     // so use the working directory instead?
 577
 578     // 256 was taken from os2def.h
 579 #ifndef MAX_PATH
 580 #  define MAX_PATH  256
 581 #endif
 582
 583     char                            zDirName[256];
 584     ULONG                           ulDirLen;
 585
 586     ::DosQueryCurrentDir(0, zDirName, &ulDirLen);
 587     rStrDir = zDirName;
 588     return rStrDir.c_str();
 589 }
 590
 591 // Hack for OS/2
 592 wxChar* wxGetUserHome (
 593   const wxString&                   rUser
 594 )
 595 {
 596     wxChar*                         zHome;
 597     wxString                        sUser1(rUser);
 598
 599     if (sUser1 != _T(""))
 600     {
 601         wxChar                      zTmp[64];
 602
 603         if (wxGetUserId( zTmp
 604                         ,sizeof(zTmp)/sizeof(char)
 605                        ))
 606         {
 607             // Guests belong in the temp dir
 608             if (wxStricmp(zTmp, _T("annonymous")) == 0)
 609             {
 610                 if ((zHome = wxGetenv(_T("TMP"))) != NULL    ||
 611                     (zHome = wxGetenv(_T("TMPDIR"))) != NULL ||
 612                     (zHome = wxGetenv(_T("TEMP"))) != NULL)
 613                     return *zHome ? zHome : (wxChar*)_T("\\");
 614             }
 615             if (wxStricmp(zTmp, WXSTRINGCAST sUser1) == 0)
 616                 sUser1 = _T("");
 617         }
 618     }
 619     if (sUser1 == _T(""))
 620         if ((zHome = wxGetenv(_T("HOME"))) != NULL)
 621         {
 622             wxStrcpy(wxBuffer, zHome);
 623             Unix2DosFilename(wxBuffer);
 624             return wxBuffer;
 625         }
 626         return NULL; // No home known!
 627 }
 628
 629 // Check whether this window wants to process messages, e.g. Stop button
 630 // in long calculations.
 631 bool wxCheckForInterrupt(
 632   wxWindow*                         pWnd
 633 )
 634 {
 635     if(pWnd)
 636     {
 637         QMSG                        vMsg;
 638         HAB                         hab;
 639         HWND                        hwndFilter;
 640         HWND                        hwndWin= (HWND) pWnd->GetHWND();
 641
 642         while(::WinPeekMsg(hab, &vMsg, hwndFilter, 0, 0, PM_REMOVE))
 643         {
 644             ::WinDispatchMsg(hab, &vMsg);
 645         }
 646         return TRUE;//*** temporary?
 647     }
 648     else
 649     {
 650         wxFAIL_MSG(_T("pWnd==NULL !!!"));
 651         return FALSE;//*** temporary?
 652     }
 653 }
 654
 655 void wxGetMousePosition(
 656   int*                              pX
 657 , int*                              pY
 658 )
 659 {
 660     POINTL                          vPt;
 661
 662     ::WinQueryPointerPos(HWND_DESKTOP, &vPt);
 663     *pX = vPt.x;
 664     *pY = vPt.y;
 665 };
 666
 667 // Return TRUE if we have a colour display
 668 bool wxColourDisplay()
 669 {
 670     HPS                             hpsScreen;
 671     HDC                             hdcScreen;
 672     LONG                            lColors;
 673
 674     hpsScreen = ::WinGetScreenPS(HWND_DESKTOP);
 675     hdcScreen = ::GpiQueryDevice(hpsScreen);
 676     ::DevQueryCaps(hdcScreen, CAPS_COLORS, 1L, &lColors);
 677     return(lColors > 1L);
 678 }
 679
 680 // Returns depth of screen
 681 int wxDisplayDepth()
 682 {
 683     HPS                             hpsScreen;
 684     HDC                             hdcScreen;
 685     LONG                            lPlanes;
 686     LONG                            lBitsPerPixel;
 687     LONG                            nDepth;
 688
 689     hpsScreen = ::WinGetScreenPS(HWND_DESKTOP);
 690     hdcScreen = ::GpiQueryDevice(hpsScreen);
 691     ::DevQueryCaps(hdcScreen, CAPS_COLOR_PLANES, 1L, &lPlanes);
 692     ::DevQueryCaps(hdcScreen, CAPS_COLOR_BITCOUNT, 1L, &lBitsPerPixel);
 693
 694     nDepth = (int)(lPlanes * lBitsPerPixel);
 695     DevCloseDC(hdcScreen);
 696     return (nDepth);
 697 }
 698
 699 // Get size of display
 700 void wxDisplaySize(
 701   int*                              pWidth
 702 , int*                              pHeight
 703 )
 704 {
 705     HPS                             hpsScreen;
 706     HDC                             hdcScreen;
 707
 708     hpsScreen = ::WinGetScreenPS(HWND_DESKTOP);
 709     hdcScreen = ::GpiQueryDevice(hpsScreen);
 710     ::DevQueryCaps(hdcScreen, CAPS_WIDTH, 1L, (PLONG)pWidth);
 711     ::DevQueryCaps(hdcScreen, CAPS_HEIGHT, 1L, (PLONG)pHeight);
 712     DevCloseDC(hdcScreen);
 713 }
 714
 715 bool wxDirExists(
 716   const wxString&                   rDir
 717 )
 718 {
 719     return (::DosSetCurrentDir(WXSTRINGCAST rDir));
 720 }
 721
 722 // ---------------------------------------------------------------------------
 723 // window information functions
 724 // ---------------------------------------------------------------------------
 725
 726 wxString WXDLLEXPORT wxGetWindowText(
 727   WXHWND                            hWnd
 728 )
 729 {
 730     wxString                        vStr;
 731     long                            lLen = ::WinQueryWindowTextLength((HWND)hWnd) + 1;
 732
 733     ::WinQueryWindowText((HWND)hWnd, lLen, vStr.GetWriteBuf((int)lLen));
 734     vStr.UngetWriteBuf();
 735
 736     return vStr;
 737 }
 738
 739 wxString WXDLLEXPORT wxGetWindowClass(
 740   WXHWND                            hWnd
 741 )
 742 {
 743     wxString                        vStr;
 744     int                             nLen = 256; // some starting value
 745
 746     for ( ;; )
 747     {
 748         int                         nCount = ::WinQueryClassName((HWND)hWnd, nLen, vStr.GetWriteBuf(nLen));
 749
 750         vStr.UngetWriteBuf();
 751         if (nCount == nLen )
 752         {
 753             // the class name might have been truncated, retry with larger
 754             // buffer
 755             nLen *= 2;
 756         }
 757         else
 758         {
 759             break;
 760         }
 761     }
 762     return vStr;
 763 }
 764
 765 WXWORD WXDLLEXPORT wxGetWindowId(
 766   WXHWND                            hWnd
 767 )
 768 {
 769     return ::WinQueryWindowUShort((HWND)hWnd, QWS_ID);
 770 }
 771