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 #ifdef __EMX__
  28 #include <dirent.h>
  29 #endif
  30
  31 #include "wx/log.h"
  32
  33 #include <io.h>
  34
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <string.h>
  38 #include <errno.h>
  39 #include <stdarg.h>
  40
  41 #define PURE_32
  42
  43 #ifndef __EMX__
  44 #include <upm.h>
  45 #include <netcons.h>
  46 #include <netbios.h>
  47 #endif
  48
  49 static const wxChar WX_SECTION[] = _T("wxWindows");
  50 static const wxChar eHOSTNAME[]  = _T("HostName");
  51 static const wxChar eUSERID[]    = _T("UserId");
  52 static const wxChar eUSERNAME[]  = _T("UserName");
  53
  54 // For the following functions we SHOULD fill in support
  55 // for Windows-NT (which I don't know) as I assume it begin
  56 // a POSIX Unix (so claims MS) that it has some special
  57 // functions beyond those provided by WinSock
  58
  59 // Get full hostname (eg. DoDo.BSn-Germany.crg.de)
  60 bool wxGetHostName(
  61   wxChar*                           zBuf
  62 , int                               nMaxSize
  63 )
  64 {
  65 #if wxUSE_NET_API
  66     char                            zServer[256];
  67     char                            zComputer[256];
  68     unsigned long                   ulLevel = 0;
  69     unsigned char*                  zBuffer = NULL;
  70     unsigned long                   ulBuffer = 256;
  71     unsigned long*                  pulTotalAvail = NULL;
  72
  73     NetBios32GetInfo( (const unsigned char*)zServer
  74                      ,(const unsigned char*)zComputer
  75                      ,ulLevel
  76                      ,zBuffer
  77                      ,ulBuffer
  78                      ,pulTotalAvail
  79                     );
  80     strcpy(zBuf, zServer);
  81 #else
  82     wxChar*                         zSysname;
  83     const wxChar*                   zDefaultHost = _T("noname");
  84
  85     if ((zSysname = wxGetenv(_T("SYSTEM_NAME"))) == NULL)
  86     {
  87         ULONG n = ::PrfQueryProfileString( HINI_PROFILE
  88                                           ,(PSZ)WX_SECTION
  89                                           ,(PSZ)eHOSTNAME
  90                                           ,(PSZ)zDefaultHost
  91                                           ,(void*)zBuf
  92                                           ,(ULONG)nMaxSize - 1
  93                                          );
  94     }
  95     else
  96         wxStrncpy(zBuf, zSysname, nMaxSize - 1);
  97     zBuf[nMaxSize] = _T('\0');
  98 #endif
  99     return *zBuf ? TRUE : FALSE;
 100 }
 101
 102 // Get user ID e.g. jacs
 103 bool wxGetUserId(
 104   wxChar*                           zBuf
 105 , int                               nType
 106 )
 107 {
 108 #ifndef __EMX__
 109     long                            lrc;
 110     // UPM procs return 0 on success
 111     lrc = U32ELOCU((unsigned char*)zBuf, (unsigned long *)&nType);
 112     if (lrc == 0) return TRUE;
 113 #endif
 114     return FALSE;
 115 }
 116
 117 bool wxGetUserName(
 118   wxChar*                           zBuf
 119 , int                               nMaxSize
 120 )
 121 {
 122 #ifdef USE_NET_API
 123     wxGetUserId( zBuf
 124                 ,nMaxSize
 125                );
 126 #else
 127     wxStrncpy(zBuf, _T("Unknown User"), nMaxSize);
 128 #endif
 129     return TRUE;
 130 }
 131
 132 int wxKill(
 133   long                              lPid
 134 , int                               nSig
 135 )
 136 {
 137     return((int)::DosKillProcess(0, (PID)lPid));
 138 }
 139
 140 //
 141 // Execute a program in an Interactive Shell
 142 //
 143 bool wxShell(
 144   const wxString&                   rCommand
 145 )
 146 {
 147     wxChar*                         zShell = _T("CMD.EXE");
 148     wxString                        sInputs;
 149     wxChar                          zTmp[255];
 150     STARTDATA                       SData = {0};
 151     PSZ                             PgmTitle = "Command Shell";
 152     APIRET                          rc;
 153     PID                             vPid = 0;
 154     ULONG                           ulSessID = 0;
 155     UCHAR                           achObjBuf[256] = {0}; //error data if DosStart fails
 156     RESULTCODES                     vResult;
 157
 158     SData.Length   = sizeof(STARTDATA);
 159     SData.Related  = SSF_RELATED_INDEPENDENT;
 160     SData.FgBg     = SSF_FGBG_FORE;
 161     SData.TraceOpt = SSF_TRACEOPT_NONE;
 162     SData.PgmTitle = PgmTitle;
 163     SData.PgmName  = zShell;
 164
 165     sInputs = "/C " + rCommand;
 166     SData.PgmInputs     = (BYTE*)sInputs.c_str();
 167     SData.TermQ         = 0;
 168     SData.Environment   = 0;
 169     SData.InheritOpt    = SSF_INHERTOPT_SHELL;
 170     SData.SessionType   = SSF_TYPE_WINDOWABLEVIO;
 171     SData.IconFile      = 0;
 172     SData.PgmHandle     = 0;
 173     SData.PgmControl    = SSF_CONTROL_VISIBLE | SSF_CONTROL_MAXIMIZE;
 174     SData.InitXPos      = 30;
 175     SData.InitYPos      = 40;
 176     SData.InitXSize     = 200;
 177     SData.InitYSize     = 140;
 178     SData.Reserved      = 0;
 179     SData.ObjectBuffer  = (char*)achObjBuf;
 180     SData.ObjectBuffLen = (ULONG)sizeof(achObjBuf);
 181
 182     rc = ::DosStartSession(&SData, &ulSessID, &vPid);
 183     if (rc == 0 || rc == 457) // NO_ERROR or SMG_START_IN_BACKGROUND
 184     {
 185         PTIB                            ptib;
 186         PPIB                            ppib;
 187
 188         ::DosGetInfoBlocks(&ptib, &ppib);
 189
 190         ::DosWaitChild( DCWA_PROCESS
 191                        ,DCWW_WAIT
 192                        ,&vResult
 193                        ,&ppib->pib_ulpid
 194                        ,vPid
 195                       );
 196     }
 197     return (rc != 0);
 198 }
 199
 200 // Get free memory in bytes, or -1 if cannot determine amount (e.g. on UNIX)
 201 long wxGetFreeMemory()
 202 {
 203     void*                           pMemptr = NULL;
 204     ULONG                           lSize;
 205     ULONG                           lMemFlags;
 206     APIRET                          rc;
 207
 208     lMemFlags = PAG_FREE;
 209     rc = ::DosQueryMem(pMemptr, &lSize, &lMemFlags);
 210     if (rc != 0)
 211         return -1L;
 212     return (long)lSize;
 213 }
 214
 215 // Sleep for nSecs seconds. Attempt a Windows implementation using timers.
 216 static bool inTimer = FALSE;
 217
 218 class wxSleepTimer: public wxTimer
 219 {
 220 public:
 221     inline void Notify()
 222     {
 223         inTimer = FALSE;
 224         Stop();
 225     }
 226 };
 227
 228 static wxTimer*                     wxTheSleepTimer = NULL;
 229
 230 void wxUsleep(
 231   unsigned long                     ulMilliseconds
 232 )
 233 {
 234     ::DosSleep(ulMilliseconds/1000l);
 235 }
 236
 237 void wxSleep(
 238   int                               nSecs
 239 )
 240 {
 241     ::DosSleep(1000 * nSecs);
 242 }
 243
 244 // Consume all events until no more left
 245 void wxFlushEvents()
 246 {
 247 //  wxYield();
 248 }
 249
 250 // Output a debug mess., in a system dependent fashion.
 251 void wxDebugMsg(
 252   const wxChar*                     zFmt ...
 253 )
 254 {
 255     va_list                         vAp;
 256     static wxChar                   zBuffer[512];
 257
 258     if (!wxTheApp->GetWantDebugOutput())
 259         return ;
 260     va_start(vAp, zFmt);
 261     sprintf(zBuffer, zFmt, vAp) ;
 262     va_end(vAp);
 263 }
 264
 265 // Non-fatal error: pop up message box and (possibly) continue
 266 void wxError(
 267   const wxString&                   rMsg
 268 , const wxString&                   rTitle
 269 )
 270 {
 271     wxBuffer = new wxChar[256];
 272     wxSprintf(wxBuffer, "%s\nContinue?", WXSTRINGCAST rMsg);
 273     if (::WinMessageBox( HWND_DESKTOP
 274                         ,NULL
 275                         ,(PSZ)wxBuffer
 276                         ,(PSZ)WXSTRINGCAST rTitle
 277                         ,0
 278                         ,MB_ICONEXCLAMATION | MB_YESNO
 279                        ) == MBID_YES)
 280     delete[] wxBuffer;
 281     wxExit();
 282 }
 283
 284 // Fatal error: pop up message box and abort
 285 void wxFatalError(
 286   const wxString&                   rMsg
 287 , const wxString&                   rTitle
 288 )
 289 {
 290     unsigned long                   ulRc;
 291
 292     ulRc = ::WinMessageBox( HWND_DESKTOP
 293                            ,NULL
 294                            ,WXSTRINGCAST rMsg
 295                            ,WXSTRINGCAST rTitle
 296                            ,0
 297                            ,MB_NOICON | MB_OK
 298                           );
 299     DosExit(EXIT_PROCESS, ulRc);
 300 }
 301
 302 // Emit a beeeeeep
 303 void wxBell()
 304 {
 305     DosBeep(1000,1000); // 1kHz during 1 sec.
 306 }
 307
 308 // Chris Breeze 27/5/98: revised WIN32 code to
 309 // detect WindowsNT correctly
 310 int wxGetOsVersion(
 311   int*                              pMajorVsn
 312 , int*                              pMinorVsn
 313 )
 314 {
 315     ULONG                           ulSysInfo[QSV_MAX] = {0};
 316     APIRET                          ulrc;
 317
 318     ulrc = ::DosQuerySysInfo( 1L
 319                              ,QSV_MAX
 320                              ,(PVOID)ulSysInfo
 321                              ,sizeof(ULONG) * QSV_MAX
 322                             );
 323     if (ulrc == 0L)
 324     {
 325         *pMajorVsn = ulSysInfo[QSV_VERSION_MAJOR];
 326         *pMajorVsn = *pMajorVsn/10;
 327         *pMinorVsn = ulSysInfo[QSV_VERSION_MINOR];
 328         return wxWINDOWS_OS2;
 329     }
 330     return wxWINDOWS; // error if we get here, return generic value
 331 }
 332
 333 // Reading and writing resources (eg WIN.INI, .Xdefaults)
 334 #if wxUSE_RESOURCES
 335 bool wxWriteResource(
 336   const wxString&                   rSection
 337 , const wxString&                   rEntry
 338 , const wxString&                   rValue
 339 , const wxString&                   rFile
 340 )
 341 {
 342     HAB                             hab = 0;
 343     HINI                            hIni = 0;
 344
 345     if (rFile != "")
 346     {
 347         hIni = ::PrfOpenProfile(hab, (PSZ)WXSTRINGCAST rFile);
 348         if (hIni != 0L)
 349         {
 350             return (::PrfWriteProfileString( hIni
 351                                             ,(PSZ)WXSTRINGCAST rSection
 352                                             ,(PSZ)WXSTRINGCAST rEntry
 353                                             ,(PSZ)WXSTRINGCAST rValue
 354                                            ));
 355         }
 356     }
 357     else
 358         return (::PrfWriteProfileString( HINI_PROFILE
 359                                         ,(PSZ)WXSTRINGCAST rSection
 360                                         ,(PSZ)WXSTRINGCAST rEntry
 361                                         ,(PSZ)WXSTRINGCAST rValue
 362                                        ));
 363     return FALSE;
 364 }
 365
 366 bool wxWriteResource(
 367   const wxString&                   rSection
 368 , const wxString&                   rEntry
 369 , float                             fValue
 370 , const wxString&                   rFile
 371 )
 372 {
 373     wxChar                          zBuf[50];
 374
 375     wxSprintf(zBuf, "%.4f", fValue);
 376     return wxWriteResource( rSection
 377                            ,rEntry
 378                            ,zBuf
 379                            ,rFile
 380                           );
 381 }
 382
 383 bool wxWriteResource(
 384   const wxString&                   rSection
 385 , const wxString&                   rEntry
 386 , long                              lValue
 387 , const wxString&                   rFile
 388 )
 389 {
 390     wxChar                          zBuf[50];
 391
 392     wxSprintf(zBuf, "%ld", lValue);
 393     return wxWriteResource( rSection
 394                            ,rEntry
 395                            ,zBuf
 396                            ,rFile
 397                           );
 398 }
 399
 400 bool wxWriteResource(
 401   const wxString&                   rSection
 402 , const wxString&                   rEntry
 403 , int                               lValue
 404 , const wxString&                   rFile
 405 )
 406 {
 407     wxChar                          zBuf[50];
 408
 409     wxSprintf(zBuf, "%d", lValue);
 410     return wxWriteResource( rSection
 411                            ,rEntry
 412                            ,zBuf
 413                            ,rFile
 414                           );
 415 }
 416
 417 bool wxGetResource(
 418   const wxString&                   rSection
 419 , const wxString&                   rEntry
 420 , wxChar**                          ppValue
 421 , const wxString&                   rFile
 422 )
 423 {
 424     HAB                             hab = 0;
 425     HINI                            hIni = 0;
 426     wxChar                          zDefunkt[] = _T("$$default");
 427     char                            zBuf[1000];
 428
 429     if (rFile != "")
 430     {
 431         hIni = ::PrfOpenProfile(hab, (PSZ)WXSTRINGCAST rFile);
 432         if (hIni != 0L)
 433         {
 434             ULONG n = ::PrfQueryProfileString( hIni
 435                                               ,(PSZ)WXSTRINGCAST rSection
 436                                               ,(PSZ)WXSTRINGCAST rEntry
 437                                               ,(PSZ)zDefunkt
 438                                               ,(PVOID)zBuf
 439                                               ,1000
 440                                              );
 441             if (zBuf == NULL)
 442                 return FALSE;
 443             if (n == 0L || wxStrcmp(zBuf, zDefunkt) == 0)
 444                 return FALSE;
 445             zBuf[n-1] = '\0';
 446         }
 447         else
 448             return FALSE;
 449     }
 450     else
 451     {
 452         ULONG n = ::PrfQueryProfileString( HINI_PROFILE
 453                                           ,(PSZ)WXSTRINGCAST rSection
 454                                           ,(PSZ)WXSTRINGCAST rEntry
 455                                           ,(PSZ)zDefunkt
 456                                           ,(PVOID)zBuf
 457                                           ,1000
 458                                          );
 459         if (zBuf == NULL)
 460             return FALSE;
 461         if (n == 0L || wxStrcmp(zBuf, zDefunkt) == 0)
 462             return FALSE;
 463         zBuf[n-1] = '\0';
 464     }
 465     strcpy((char*)*ppValue, zBuf);
 466     return TRUE;
 467 }
 468
 469 bool wxGetResource(
 470   const wxString&                   rSection
 471 , const wxString&                   rEntry
 472 , float*                            pValue
 473 , const wxString&                   rFile
 474 )
 475 {
 476     wxChar*                         zStr = NULL;
 477
 478     zStr = new wxChar[1000];
 479     bool                            bSucc = wxGetResource( rSection
 480                                                           ,rEntry
 481                                                           ,(wxChar **)&zStr
 482                                                           ,rFile
 483                                                          );
 484
 485     if (bSucc)
 486     {
 487         *pValue = (float)wxStrtod(zStr, NULL);
 488         delete[] zStr;
 489         return TRUE;
 490     }
 491     else
 492     {
 493         delete[] zStr;
 494         return FALSE;
 495     }
 496 }
 497
 498 bool wxGetResource(
 499   const wxString&                   rSection
 500 , const wxString&                   rEntry
 501 , long*                             pValue
 502 , const wxString&                   rFile
 503 )
 504 {
 505     wxChar*                           zStr = NULL;
 506
 507     zStr = new wxChar[1000];
 508     bool                              bSucc = wxGetResource( rSection
 509                                                             ,rEntry
 510                                                             ,(wxChar **)&zStr
 511                                                             ,rFile
 512                                                            );
 513
 514     if (bSucc)
 515     {
 516         *pValue = wxStrtol(zStr, NULL, 10);
 517         delete[] zStr;
 518         return TRUE;
 519     }
 520     else
 521     {
 522         delete[] zStr;
 523         return FALSE;
 524     }
 525 }
 526
 527 bool wxGetResource(
 528   const wxString&                   rSection
 529 , const wxString&                   rEntry
 530 , int*                              pValue
 531 , const wxString&                   rFile
 532 )
 533 {
 534     wxChar*                         zStr = NULL;
 535
 536     zStr = new wxChar[1000];
 537     bool                            bSucc = wxGetResource( rSection
 538                                                           ,rEntry
 539                                                           ,(wxChar **)&zStr
 540                                                           ,rFile
 541                                                          );
 542
 543     if (bSucc)
 544     {
 545         *pValue = (int)wxStrtol(zStr, NULL, 10);
 546         delete[] zStr;
 547         return TRUE;
 548     }
 549     else
 550     {
 551         delete[] zStr;
 552         return FALSE;
 553     }
 554 }
 555 #endif // wxUSE_RESOURCES
 556
 557 // ---------------------------------------------------------------------------
 558 // helper functions for showing a "busy" cursor
 559 // ---------------------------------------------------------------------------
 560
 561 HCURSOR gs_wxBusyCursor = 0;     // new, busy cursor
 562 HCURSOR gs_wxBusyCursorOld = 0;  // old cursor
 563 static int gs_wxBusyCursorCount = 0;
 564
 565 // Set the cursor to the busy cursor for all windows
 566 void wxBeginBusyCursor(
 567   wxCursor*                         pCursor
 568 )
 569 {
 570     if ( gs_wxBusyCursorCount++ == 0 )
 571     {
 572         gs_wxBusyCursor = (HCURSOR)pCursor->GetHCURSOR();
 573         ::WinSetPointer(HWND_DESKTOP, (HPOINTER)gs_wxBusyCursor);
 574     }
 575     //else: nothing to do, already set
 576 }
 577
 578 // Restore cursor to normal
 579 void wxEndBusyCursor()
 580 {
 581     wxCHECK_RET( gs_wxBusyCursorCount > 0
 582                 ,_T("no matching wxBeginBusyCursor() for wxEndBusyCursor()")
 583                );
 584
 585     if (--gs_wxBusyCursorCount == 0)
 586     {
 587         ::WinSetPointer(HWND_DESKTOP, (HPOINTER)gs_wxBusyCursorOld);
 588         gs_wxBusyCursorOld = 0;
 589     }
 590 }
 591
 592 // TRUE if we're between the above two calls
 593 bool wxIsBusy()
 594 {
 595     return (gs_wxBusyCursorCount > 0);
 596 }
 597
 598 // ---------------------------------------------------------------------------
 599 const wxChar* wxGetHomeDir(
 600   wxString*                         pStr
 601 )
 602 {
 603     wxString&                       rStrDir = *pStr;
 604
 605     // OS/2 has no idea about home,
 606     // so use the working directory instead?
 607
 608     // 256 was taken from os2def.h
 609 #ifndef MAX_PATH
 610 #  define MAX_PATH  256
 611 #endif
 612
 613     char                            zDirName[256];
 614     ULONG                           ulDirLen;
 615
 616     ::DosQueryCurrentDir(0, zDirName, &ulDirLen);
 617     rStrDir = zDirName;
 618     return rStrDir.c_str();
 619 }
 620
 621 // Hack for OS/2
 622 wxChar* wxGetUserHome (
 623   const wxString&                   rUser
 624 )
 625 {
 626     wxChar*                         zHome;
 627     wxString                        sUser1(rUser);
 628
 629     wxBuffer = new wxChar[256];
 630 #ifndef __EMX__
 631     if (sUser1 != _T(""))
 632     {
 633         wxChar                      zTmp[64];
 634
 635         if (wxGetUserId( zTmp
 636                         ,sizeof(zTmp)/sizeof(char)
 637                        ))
 638         {
 639             // Guests belong in the temp dir
 640             if (wxStricmp(zTmp, _T("annonymous")) == 0)
 641             {
 642                 if ((zHome = wxGetenv(_T("TMP"))) != NULL    ||
 643                     (zHome = wxGetenv(_T("TMPDIR"))) != NULL ||
 644                     (zHome = wxGetenv(_T("TEMP"))) != NULL)
 645                     delete[] wxBuffer;
 646                     return *zHome ? zHome : (wxChar*)_T("\\");
 647             }
 648             if (wxStricmp(zTmp, WXSTRINGCAST sUser1) == 0)
 649                 sUser1 = _T("");
 650         }
 651     }
 652 #endif
 653     if (sUser1 == _T(""))
 654     {
 655         if ((zHome = wxGetenv(_T("HOME"))) != NULL)
 656         {
 657             wxStrcpy(wxBuffer, zHome);
 658             Unix2DosFilename(wxBuffer);
 659             wxStrcpy(zHome, wxBuffer);
 660             delete[] wxBuffer;
 661             return zHome;
 662         }
 663     }
 664     delete[] wxBuffer;
 665     return NULL; // No home known!
 666 }
 667
 668 // Check whether this window wants to process messages, e.g. Stop button
 669 // in long calculations.
 670 bool wxCheckForInterrupt(
 671   wxWindow*                         pWnd
 672 )
 673 {
 674     if(pWnd)
 675     {
 676         QMSG                        vMsg;
 677         HAB                         hab = 0;
 678         HWND                        hwndFilter = NULLHANDLE;
 679         HWND                        hwndWin= (HWND) pWnd->GetHWND();
 680
 681         while(::WinPeekMsg(hab, &vMsg, hwndFilter, 0, 0, PM_REMOVE))
 682         {
 683             ::WinDispatchMsg(hab, &vMsg);
 684         }
 685         return TRUE;//*** temporary?
 686     }
 687     else
 688     {
 689         wxFAIL_MSG(_T("pWnd==NULL !!!"));
 690         return FALSE;//*** temporary?
 691     }
 692 }
 693
 694 void wxGetMousePosition(
 695   int*                              pX
 696 , int*                              pY
 697 )
 698 {
 699     POINTL                          vPt;
 700
 701     ::WinQueryPointerPos(HWND_DESKTOP, &vPt);
 702     *pX = vPt.x;
 703     *pY = vPt.y;
 704 };
 705
 706 // Return TRUE if we have a colour display
 707 bool wxColourDisplay()
 708 {
 709     HPS                             hpsScreen;
 710     HDC                             hdcScreen;
 711     LONG                            lColors;
 712
 713     hpsScreen = ::WinGetScreenPS(HWND_DESKTOP);
 714     hdcScreen = ::GpiQueryDevice(hpsScreen);
 715     ::DevQueryCaps(hdcScreen, CAPS_COLORS, 1L, &lColors);
 716     return(lColors > 1L);
 717 }
 718
 719 // Returns depth of screen
 720 int wxDisplayDepth()
 721 {
 722     HPS                             hpsScreen;
 723     HDC                             hdcScreen;
 724     LONG                            lPlanes;
 725     LONG                            lBitsPerPixel;
 726     LONG                            nDepth;
 727
 728     hpsScreen = ::WinGetScreenPS(HWND_DESKTOP);
 729     hdcScreen = ::GpiQueryDevice(hpsScreen);
 730     ::DevQueryCaps(hdcScreen, CAPS_COLOR_PLANES, 1L, &lPlanes);
 731     ::DevQueryCaps(hdcScreen, CAPS_COLOR_BITCOUNT, 1L, &lBitsPerPixel);
 732
 733     nDepth = (int)(lPlanes * lBitsPerPixel);
 734     DevCloseDC(hdcScreen);
 735     return (nDepth);
 736 }
 737
 738 // Get size of display
 739 void wxDisplaySize(
 740   int*                              pWidth
 741 , int*                              pHeight
 742 )
 743 {
 744     HPS                             hpsScreen;
 745     HDC                             hdcScreen;
 746     LONG                            lWidth;
 747     LONG                            lHeight;
 748
 749     hpsScreen = ::WinGetScreenPS(HWND_DESKTOP);
 750     hdcScreen = ::GpiQueryDevice(hpsScreen);
 751     ::DevQueryCaps(hdcScreen, CAPS_WIDTH, 1L, &lWidth);
 752     ::DevQueryCaps(hdcScreen, CAPS_HEIGHT, 1L, &lHeight);
 753     DevCloseDC(hdcScreen);
 754     *pWidth = (int)lWidth;
 755     *pHeight = (int)lHeight;
 756 }
 757
 758 bool wxDirExists(
 759   const wxString&                   rDir
 760 )
 761 {
 762     return (::DosSetCurrentDir(WXSTRINGCAST rDir));
 763 }
 764
 765 // ---------------------------------------------------------------------------
 766 // window information functions
 767 // ---------------------------------------------------------------------------
 768
 769 wxString WXDLLEXPORT wxGetWindowText(
 770   WXHWND                            hWnd
 771 )
 772 {
 773     wxString                        vStr;
 774     long                            lLen = ::WinQueryWindowTextLength((HWND)hWnd) + 1;
 775
 776     ::WinQueryWindowText((HWND)hWnd, lLen, vStr.GetWriteBuf((int)lLen));
 777     vStr.UngetWriteBuf();
 778
 779     return vStr;
 780 }
 781
 782 wxString WXDLLEXPORT wxGetWindowClass(
 783   WXHWND                            hWnd
 784 )
 785 {
 786     wxString                        vStr;
 787     int                             nLen = 256; // some starting value
 788
 789     for ( ;; )
 790     {
 791         int                         nCount = ::WinQueryClassName((HWND)hWnd, nLen, vStr.GetWriteBuf(nLen));
 792
 793         vStr.UngetWriteBuf();
 794         if (nCount == nLen )
 795         {
 796             // the class name might have been truncated, retry with larger
 797             // buffer
 798             nLen *= 2;
 799         }
 800         else
 801         {
 802             break;
 803         }
 804     }
 805     return vStr;
 806 }
 807
 808 WXWORD WXDLLEXPORT wxGetWindowId(
 809   WXHWND                            hWnd
 810 )
 811 {
 812     return ::WinQueryWindowUShort((HWND)hWnd, QWS_ID);
 813 }
 814
 815 wxString WXDLLEXPORT wxPMErrorToStr(
 816   ERRORID                           vError
 817 )
 818 {
 819     wxString                        sError;
 820
 821     //
 822     // Remove the high order byte -- it is useless
 823     //
 824     vError &= 0x0000ffff;
 825     switch(vError)
 826     {
 827         case PMERR_INVALID_HWND:
 828             sError = wxT("Invalid window handle specified");
 829             break;
 830
 831         case PMERR_INVALID_FLAG:
 832             sError = wxT("Invalid flag bit set");
 833             break;
 834
 835         case PMERR_NO_MSG_QUEUE:
 836             sError = wxT("No message queue available");
 837             break;
 838
 839         case PMERR_INVALID_PARM:
 840             sError = wxT("Parameter contained invalid data");
 841             break;
 842
 843         case PMERR_INVALID_PARAMETERS:
 844             sError = wxT("Parameter value is out of range");
 845             break;
 846
 847         case PMERR_PARAMETER_OUT_OF_RANGE:
 848             sError = wxT("Parameter value is out of range");
 849             break;
 850
 851         case PMERR_INVALID_INTEGER_ATOM:
 852             sError = wxT("Not a valid atom");
 853             break;
 854
 855         case PMERR_INVALID_HATOMTBL:
 856             sError = wxT("Atom table handle is invalid");
 857             break;
 858
 859         case PMERR_INVALID_ATOM_NAME:
 860             sError = wxT("Not a valid atom name");
 861             break;
 862
 863         case PMERR_ATOM_NAME_NOT_FOUND:
 864             sError = wxT("Valid name format, but cannot find name in atom table");
 865             break;
 866
 867         default:
 868             sError = wxT("Unknown error");
 869     }
 870     return(sError);
 871 } // end of wxPMErrorToStr
 872
 873