src/msw/utils.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        utils.cpp
   3 // Purpose:     Various utilities
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart and Markus Holzem
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13 #pragma implementation
  14 #pragma implementation "utils.h"
  15 #endif
  16
  17 // For compilers that support precompilation, includes "wx.h".
  18 #include "wx/wxprec.h"
  19
  20 #ifdef __BORLANDC__
  21 #pragma hdrstop
  22 #endif
  23
  24 #ifndef WX_PRECOMP
  25 #include "wx/setup.h"
  26 #include "wx/utils.h"
  27 #include "wx/app.h"
  28 #include "wx/cursor.h"
  29 #endif
  30
  31 #include "wx/msw/private.h"
  32 #include "wx/timer.h"
  33
  34 #include <ctype.h>
  35
  36 #ifndef __GNUWIN32__
  37 #include <direct.h>
  38 #include <dos.h>
  39 #endif
  40
  41 #ifdef __GNUWIN32__
  42 #include <sys/unistd.h>
  43 #include <sys/stat.h>
  44 #ifndef __MINGW32__
  45 #include <std.h>
  46 #endif
  47
  48 #define stricmp strcasecmp
  49 #endif
  50
  51 #ifdef __BORLANDC__ // Please someone tell me which version of Borland needs
  52                     // this (3.1 I believe) and how to test for it.
  53                     // If this works for Borland 4.0 as well, then no worries.
  54 #include <dir.h>
  55 #endif
  56
  57 #ifdef __WIN32__
  58 #include <io.h>
  59
  60 #ifndef __GNUWIN32__
  61 #include <shellapi.h>
  62 #endif
  63 #endif
  64
  65 #include <stdio.h>
  66 #include <stdlib.h>
  67 #include <string.h>
  68 #ifndef __WATCOMC__
  69 #if !(defined(_MSC_VER) && (_MSC_VER > 800))
  70 #include <errno.h>
  71 #endif
  72 #endif
  73 #include <stdarg.h>
  74
  75 // In the WIN.INI file
  76 static const char WX_SECTION[] = "wxWindows";
  77 static const char eHOSTNAME[]  = "HostName";
  78 static const char eUSERID[]    = "UserId";
  79 static const char eUSERNAME[]  = "UserName";
  80
  81 // For the following functions we SHOULD fill in support
  82 // for Windows-NT (which I don't know) as I assume it begin
  83 // a POSIX Unix (so claims MS) that it has some special
  84 // functions beyond those provided by WinSock
  85
  86 // Get full hostname (eg. DoDo.BSn-Germany.crg.de)
  87 bool wxGetHostName(char *buf, int maxSize)
  88 {
  89 #ifdef __WIN32__
  90   DWORD nSize = maxSize;
  91   return (::GetComputerName(buf, &nSize) != 0);
  92 #else
  93   char *sysname;
  94   const char *default_host = "noname";
  95
  96   if ((sysname = getenv("SYSTEM_NAME")) == NULL) {
  97      GetProfileString(WX_SECTION, eHOSTNAME, default_host, buf, maxSize - 1);
  98   } else
  99     strncpy(buf, sysname, maxSize - 1);
 100   buf[maxSize] = '\0';
 101   return *buf ? TRUE : FALSE;
 102 #endif
 103 }
 104
 105 // Get user ID e.g. jacs
 106 bool wxGetUserId(char *buf, int maxSize)
 107 {
 108 #if defined(__WIN32__) && !defined(__win32s__) && 0
 109   // Gets the current user's full name according to the MS article PSS ID
 110   // Number: Q119670
 111   // Seems to be the same as the login name for me?
 112   char *UserName = new char[256];
 113   char *Domain = new char[256];
 114   DWORD maxCharacters = 255;
 115   GetUserName( UserName, &maxCharacters );
 116   GetComputerName( Domain, &maxCharacters );
 117
 118   WCHAR  wszUserName[256];           // Unicode user name
 119   WCHAR  wszDomain[256];
 120   LPBYTE ComputerName;
 121
 122   struct _SERVER_INFO_100 *si100;   // Server structure
 123   struct _USER_INFO_2 *ui;          // User structure
 124
 125   // Convert ASCII user name and domain to Unicode.
 126
 127   MultiByteToWideChar( CP_ACP, 0, UserName,
 128      strlen(UserName)+1, wszUserName, sizeof(wszUserName) );
 129   MultiByteToWideChar( CP_ACP, 0, Domain,
 130      strlen(Domain)+1, wszDomain, sizeof(wszDomain) );
 131
 132   // Get the computer name of a DC for the specified domain.
 133   // >If you get a link error on this, include netapi32.lib<
 134
 135   NetGetDCName( NULL, wszDomain, &ComputerName );
 136
 137   // Look up the user on the DC.
 138
 139   if(NetUserGetInfo( (LPWSTR) ComputerName,
 140      (LPWSTR) &wszUserName, 2, (LPBYTE *) &ui))
 141   {
 142      printf( "Error getting user information.\n" );
 143      return( FALSE );
 144   }
 145
 146   // Convert the Unicode full name to ASCII.
 147
 148   WideCharToMultiByte( CP_ACP, 0, ui->usri2_full_name,
 149      -1, buf, 256, NULL, NULL );
 150   }
 151   return( TRUE );
 152 /*
 153   DWORD nSize = maxSize;
 154   return ::GetUserName(buf, &nSize);
 155 */
 156 #else
 157   char *user;
 158   const char *default_id = "anonymous";
 159
 160   // Can't assume we have NIS (PC-NFS) or some other ID daemon
 161   // So we ...
 162   if (  (user = getenv("USER")) == NULL &&
 163         (user = getenv("LOGNAME")) == NULL ) {
 164      // Use wxWindows configuration data (comming soon)
 165      GetProfileString(WX_SECTION, eUSERID, default_id, buf, maxSize - 1);
 166   } else
 167     strncpy(buf, user, maxSize - 1);
 168   return *buf ? TRUE : FALSE;
 169 #endif
 170 }
 171
 172 // Get user name e.g. Julian Smart
 173 bool wxGetUserName(char *buf, int maxSize)
 174 {
 175   const char *default_name = "Unknown User";
 176 #if defined(__WIN32__)
 177 /*
 178   DWORD nSize = maxSize;
 179   In VC++ 4.0, results in unresolved symbol __imp__GetUserNameA
 180   if (GetUserName(buf, &nSize))
 181     return TRUE;
 182   else
 183 */
 184     // Could use NIS, MS-Mail or other site specific programs
 185     // Use wxWindows configuration data
 186     GetProfileString(WX_SECTION, eUSERNAME, default_name, buf, maxSize - 1);
 187     return *buf ? TRUE : FALSE;
 188 //  }
 189 #else
 190 #if !defined(__WATCOMC__) && !defined(__GNUWIN32__) && USE_PENWINDOWS
 191   extern HANDLE hPenWin; // PenWindows Running?
 192   if (hPenWin)
 193   {
 194     // PenWindows Does have a user concept!
 195     // Get the current owner of the recognizer
 196     GetPrivateProfileString("Current", "User", default_name, wxBuffer, maxSize - 1, "PENWIN.INI");
 197     strncpy(buf, wxBuffer, maxSize - 1);
 198   }
 199   else
 200 #endif
 201   {
 202     // Could use NIS, MS-Mail or other site specific programs
 203     // Use wxWindows configuration data
 204     GetProfileString(WX_SECTION, eUSERNAME, default_name, buf, maxSize - 1);
 205   }
 206   return *buf ? TRUE : FALSE;
 207 #endif
 208 }
 209
 210 // Execute a command (e.g. another program) in a
 211 // system-independent manner.
 212
 213 long wxExecute(char **argv, bool sync)
 214 {
 215   if (*argv == NULL)
 216     return 0;
 217
 218   char command[1024];
 219   command[0] = '\0';
 220
 221   int argc;
 222   for (argc = 0; argv[argc]; argc++)
 223    {
 224     if (argc)
 225       strcat(command, " ");
 226     strcat(command, argv[argc]);
 227    }
 228
 229   return wxExecute((char *)command, sync);
 230 }
 231
 232 long wxExecute(const wxString& command, bool sync)
 233 {
 234   if (command == "")
 235     return 0;
 236
 237 #ifdef __WIN32__
 238   char * cl;
 239   char * argp;
 240   int clen;
 241   HINSTANCE result;
 242   DWORD dresult;
 243
 244   // copy the command line
 245   clen = command.Length();
 246   if (!clen) return -1;
 247   cl = (char *) calloc( 1, 256);
 248   if (!cl) return -1;
 249   strcpy( cl, WXSTRINGCAST command);
 250
 251   // isolate command and arguments
 252   argp = strchr( cl, ' ');
 253   if (argp)
 254     *argp++ = '\0';
 255
 256   // execute the command
 257 #ifdef __GNUWIN32__
 258   result = ShellExecute( (HWND) (wxTheApp->GetTopWindow() ? (HWND) wxTheApp->GetTopWindow()->GetHWND() : NULL),
 259      (const wchar_t) "open", (const wchar_t) cl, (const wchar_t) argp, (const wchar_t) NULL, SW_SHOWNORMAL);
 260 #else
 261   result = ShellExecute( (HWND) (wxTheApp->GetTopWindow() ? wxTheApp->GetTopWindow()->GetHWND() : NULL),
 262      "open", cl, argp, NULL, SW_SHOWNORMAL);
 263 #endif
 264
 265   if (((long)result) <= 32) {
 266    free(cl);
 267    return 0;
 268   }
 269
 270   if (!sync)
 271   {
 272     free(cl);
 273     return dresult;
 274   }
 275
 276   // waiting until command executed
 277   do {
 278     wxYield();
 279     dresult = GetModuleFileName( result, cl, 256);
 280   } while( dresult);
 281
 282   /* long lastError = GetLastError(); */
 283
 284   free(cl);
 285   return 0;
 286 #else
 287   long instanceID = WinExec((LPCSTR) WXSTRINGCAST command, SW_SHOW);
 288   if (instanceID < 32) return(0);
 289
 290   if (sync) {
 291     int running;
 292     do {
 293       wxYield();
 294       running = GetModuleUsage((HANDLE)instanceID);
 295     } while (running);
 296   }
 297   return(instanceID);
 298 #endif
 299 }
 300
 301 int wxKill(long pid, int sig)
 302 {
 303   return 0;
 304 }
 305
 306 //
 307 // Execute a program in an Interactive Shell
 308 //
 309 bool
 310 wxShell(const wxString& command)
 311 {
 312   char *shell;
 313   if ((shell = getenv("COMSPEC")) == NULL)
 314     shell = "\\COMMAND.COM";
 315
 316   char tmp[255];
 317   if (command != "")
 318     sprintf(tmp, "%s /c %s", shell, WXSTRINGCAST command);
 319   else
 320     strcpy(tmp, shell);
 321
 322   return (wxExecute((char *)tmp, FALSE) != 0);
 323 }
 324
 325 // Get free memory in bytes, or -1 if cannot determine amount (e.g. on UNIX)
 326 long wxGetFreeMemory(void)
 327 {
 328 #if defined(__WIN32__) && !defined(__BORLANDC__)
 329   MEMORYSTATUS memStatus;
 330   memStatus.dwLength = sizeof(MEMORYSTATUS);
 331   GlobalMemoryStatus(&memStatus);
 332   return memStatus.dwAvailPhys;
 333 #else
 334   return (long)GetFreeSpace(0);
 335 #endif
 336 }
 337
 338 // Sleep for nSecs seconds. Attempt a Windows implementation using timers.
 339 static bool inTimer = FALSE;
 340 class wxSleepTimer: public wxTimer
 341 {
 342  public:
 343   inline void Notify(void)
 344   {
 345     inTimer = FALSE;
 346     Stop();
 347   }
 348 };
 349
 350 static wxTimer *wxTheSleepTimer = NULL;
 351
 352 void wxSleep(int nSecs)
 353 {
 354 #if 0 // WIN32 hangs app
 355   Sleep( 1000*nSecs );
 356 #else
 357   if (inTimer)
 358     return;
 359
 360   wxTheSleepTimer = new wxSleepTimer;
 361   inTimer = TRUE;
 362   wxTheSleepTimer->Start(nSecs*1000);
 363   while (inTimer)
 364   {
 365     if (wxTheApp->Pending())
 366       wxTheApp->Dispatch();
 367   }
 368   delete wxTheSleepTimer;
 369   wxTheSleepTimer = NULL;
 370 #endif
 371 }
 372
 373 // Consume all events until no more left
 374 void wxFlushEvents(void)
 375 {
 376 //  wxYield();
 377 }
 378
 379 // Output a debug mess., in a system dependent fashion.
 380 void wxDebugMsg(const char *fmt ...)
 381 {
 382   va_list ap;
 383   static char buffer[512];
 384
 385   if (!wxTheApp->GetWantDebugOutput())
 386     return ;
 387
 388   va_start(ap, fmt);
 389
 390   wvsprintf(buffer,fmt,ap) ;
 391   OutputDebugString((LPCSTR)buffer) ;
 392
 393   va_end(ap);
 394 }
 395
 396 // Non-fatal error: pop up message box and (possibly) continue
 397 void wxError(const wxString& msg, const wxString& title)
 398 {
 399   sprintf(wxBuffer, "%s\nContinue?", WXSTRINGCAST msg);
 400   if (MessageBox(NULL, (LPCSTR)wxBuffer, (LPCSTR)WXSTRINGCAST title,
 401              MB_ICONSTOP | MB_YESNO) == IDNO)
 402     wxExit();
 403 }
 404
 405 // Fatal error: pop up message box and abort
 406 void wxFatalError(const wxString& msg, const wxString& title)
 407 {
 408   sprintf(wxBuffer, "%s: %s", WXSTRINGCAST title, WXSTRINGCAST msg);
 409   FatalAppExit(0, (LPCSTR)wxBuffer);
 410 }
 411
 412 // Emit a beeeeeep
 413 void wxBell(void)
 414 {
 415 #ifdef __WIN32__
 416   Beep(1000,1000) ;     // 1kHz during 1 sec.
 417 #else
 418   MessageBeep(-1) ;
 419 #endif
 420 }
 421
 422 // Chris Breeze 27/5/98: revised WIN32 code to
 423 // detect WindowsNT correctly
 424 int wxGetOsVersion(int *majorVsn, int *minorVsn)
 425 {
 426   extern char *wxOsVersion;
 427   if (majorVsn) *majorVsn = 0;
 428   if (minorVsn) *minorVsn = 0;
 429
 430 #ifdef WIN32
 431   OSVERSIONINFO info;
 432   memset(&info, 0, sizeof(OSVERSIONINFO));
 433   info.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
 434   if (GetVersionEx(&info))
 435   {
 436     if (majorVsn) *majorVsn = info.dwMajorVersion;
 437     if (minorVsn) *minorVsn = info.dwMinorVersion;
 438     switch (info.dwPlatformId)
 439         {
 440         case VER_PLATFORM_WIN32s:
 441                 return wxWIN32S;
 442                 break;
 443         case VER_PLATFORM_WIN32_WINDOWS:
 444                 return wxWIN95;
 445                 break;
 446         case VER_PLATFORM_WIN32_NT:
 447                 return wxWINDOWS_NT;
 448                 break;
 449         }
 450   }
 451   return wxWINDOWS;     // error if we get here, return generic value
 452 #else
 453   // Win16 code...
 454   int retValue ;
 455 #  ifdef __WINDOWS_386__
 456   retValue = wxWIN386;
 457 #  else
 458 #    if !defined(__WATCOMC__) && !defined(GNUWIN32)
 459   extern HANDLE hPenWin;
 460   retValue = hPenWin ? wxPENWINDOWS : wxWINDOWS ;
 461 #    endif
 462 #  endif
 463   // @@@@ To be completed. I don't have the manual here...
 464   if (majorVsn) *majorVsn = 3 ;
 465   if (minorVsn) *minorVsn = 1 ;
 466   return retValue ;
 467 #endif
 468 }
 469
 470 // Reading and writing resources (eg WIN.INI, .Xdefaults)
 471 #if USE_RESOURCES
 472 bool wxWriteResource(const wxString& section, const wxString& entry, const wxString& value, const wxString& file)
 473 {
 474   if (file != "")
 475     return (WritePrivateProfileString((LPCSTR)WXSTRINGCAST section, (LPCSTR)WXSTRINGCAST entry, (LPCSTR)value, (LPCSTR)WXSTRINGCAST file) != 0);
 476   else
 477     return (WriteProfileString((LPCSTR)WXSTRINGCAST section, (LPCSTR)WXSTRINGCAST entry, (LPCSTR)WXSTRINGCAST value) != 0);
 478 }
 479
 480 bool wxWriteResource(const wxString& section, const wxString& entry, float value, const wxString& file)
 481 {
 482   char buf[50];
 483   sprintf(buf, "%.4f", value);
 484   return wxWriteResource(section, entry, buf, file);
 485 }
 486
 487 bool wxWriteResource(const wxString& section, const wxString& entry, long value, const wxString& file)
 488 {
 489   char buf[50];
 490   sprintf(buf, "%ld", value);
 491   return wxWriteResource(section, entry, buf, file);
 492 }
 493
 494 bool wxWriteResource(const wxString& section, const wxString& entry, int value, const wxString& file)
 495 {
 496   char buf[50];
 497   sprintf(buf, "%d", value);
 498   return wxWriteResource(section, entry, buf, file);
 499 }
 500
 501 bool wxGetResource(const wxString& section, const wxString& entry, char **value, const wxString& file)
 502 {
 503   static const char defunkt[] = "$$default";
 504   if (file != "")
 505   {
 506     int n = GetPrivateProfileString((LPCSTR)WXSTRINGCAST section, (LPCSTR)WXSTRINGCAST entry, (LPCSTR)defunkt,
 507                                     (LPSTR)wxBuffer, 1000, (LPCSTR)WXSTRINGCAST file);
 508     if (n == 0 || strcmp(wxBuffer, defunkt) == 0)
 509      return FALSE;
 510   }
 511   else
 512   {
 513     int n = GetProfileString((LPCSTR)WXSTRINGCAST section, (LPCSTR)WXSTRINGCAST entry, (LPCSTR)defunkt,
 514                                     (LPSTR)wxBuffer, 1000);
 515     if (n == 0 || strcmp(wxBuffer, defunkt) == 0)
 516       return FALSE;
 517   }
 518   if (*value) delete[] (*value);
 519       *value = copystring(wxBuffer);
 520       return TRUE;
 521     }
 522
 523 bool wxGetResource(const wxString& section, const wxString& entry, float *value, const wxString& file)
 524 {
 525   char *s = NULL;
 526   bool succ = wxGetResource(section, entry, (char **)&s, file);
 527   if (succ)
 528   {
 529     *value = (float)strtod(s, NULL);
 530     delete[] s;
 531     return TRUE;
 532   }
 533   else return FALSE;
 534 }
 535
 536 bool wxGetResource(const wxString& section, const wxString& entry, long *value, const wxString& file)
 537 {
 538   char *s = NULL;
 539   bool succ = wxGetResource(section, entry, (char **)&s, file);
 540   if (succ)
 541   {
 542     *value = strtol(s, NULL, 10);
 543     delete[] s;
 544     return TRUE;
 545   }
 546   else return FALSE;
 547 }
 548
 549 bool wxGetResource(const wxString& section, const wxString& entry, int *value, const wxString& file)
 550 {
 551   char *s = NULL;
 552   bool succ = wxGetResource(section, entry, (char **)&s, file);
 553   if (succ)
 554   {
 555     *value = (int)strtol(s, NULL, 10);
 556     delete[] s;
 557     return TRUE;
 558   }
 559   else return FALSE;
 560 }
 561 #endif // USE_RESOURCES
 562
 563 // Old cursor
 564 static HCURSOR wxBusyCursorOld = 0;
 565 static int wxBusyCursorCount = 0;
 566
 567 // Set the cursor to the busy cursor for all windows
 568 void wxBeginBusyCursor(wxCursor *cursor)
 569 {
 570   wxBusyCursorCount ++;
 571   if (wxBusyCursorCount == 1)
 572   {
 573     wxBusyCursorOld = ::SetCursor((HCURSOR) cursor->GetHCURSOR());
 574   }
 575   else
 576   {
 577     (void)::SetCursor((HCURSOR) cursor->GetHCURSOR());
 578   }
 579 }
 580
 581 // Restore cursor to normal
 582 void wxEndBusyCursor(void)
 583 {
 584   if (wxBusyCursorCount == 0)
 585     return;
 586
 587   wxBusyCursorCount --;
 588   if (wxBusyCursorCount == 0)
 589   {
 590     ::SetCursor(wxBusyCursorOld);
 591     wxBusyCursorOld = 0;
 592   }
 593 }
 594
 595 // TRUE if we're between the above two calls
 596 bool wxIsBusy(void)
 597 {
 598   return (wxBusyCursorCount > 0);
 599 }
 600
 601 // Hack for MS-DOS
 602 char *wxGetUserHome (const wxString& user)
 603 {
 604   char *home;
 605   wxString user1(user);
 606
 607   if (user1 != "") {
 608     char tmp[64];
 609     if (wxGetUserId(tmp, sizeof(tmp)/sizeof(char))) {
 610       // Guests belong in the temp dir
 611       if (stricmp(tmp, "annonymous") == 0) {
 612         if ((home = getenv("TMP")) != NULL ||
 613             (home = getenv("TMPDIR")) != NULL ||
 614             (home = getenv("TEMP")) != NULL)
 615           return *home ? home : "\\";
 616       }
 617       if (stricmp(tmp, WXSTRINGCAST user1) == 0)
 618             user1 = "";
 619     }
 620   }
 621   if (user1 == "")
 622     if ((home = getenv("HOME")) != NULL)
 623     {
 624       strcpy(wxBuffer, home);
 625       Unix2DosFilename(wxBuffer);
 626       return wxBuffer;
 627     }
 628   return NULL; // No home known!
 629 }
 630
 631 // Check whether this window wants to process messages, e.g. Stop button
 632 // in long calculations.
 633 bool wxCheckForInterrupt(wxWindow *wnd)
 634 {
 635         if(wnd){
 636                 MSG msg;
 637                 HWND win= (HWND) wnd->GetHWND();
 638                 while(PeekMessage(&msg,win,0,0,PM_REMOVE)){
 639                         TranslateMessage(&msg);
 640                         DispatchMessage(&msg);
 641                 }
 642                 return TRUE;//*** temporary?
 643         }
 644         else{
 645                 wxError("wnd==NULL !!!");
 646                 return FALSE;//*** temporary?
 647         }
 648 }
 649
 650 // MSW only: get user-defined resource from the .res file.
 651 // Returns NULL or newly-allocated memory, so use delete[] to clean up.
 652
 653 #ifdef __WINDOWS__
 654 char *wxLoadUserResource(const wxString& resourceName, const wxString& resourceType)
 655 {
 656   char *s = NULL;
 657 #ifndef __WIN32__
 658   HRSRC hResource = ::FindResource(wxGetInstance(), WXSTRINGCAST resourceName, WXSTRINGCAST resourceType);
 659 #else
 660 #ifdef UNICODE
 661   HRSRC hResource = ::FindResourceW(wxGetInstance(), WXSTRINGCAST resourceName, WXSTRINGCAST resourceType);
 662 #else
 663   HRSRC hResource = ::FindResourceA(wxGetInstance(), WXSTRINGCAST resourceName, WXSTRINGCAST resourceType);
 664 #endif
 665 #endif
 666
 667   if (hResource == 0)
 668     return NULL;
 669   HGLOBAL hData = ::LoadResource(wxGetInstance(), hResource);
 670   if (hData == 0)
 671     return NULL;
 672   char *theText = (char *)LockResource(hData);
 673   if (!theText)
 674     return NULL;
 675
 676   s = copystring(theText);
 677
 678   // Obsolete in WIN32
 679 #ifndef __WIN32__
 680   UnlockResource(hData);
 681 #endif
 682
 683   // No need??
 684 //  GlobalFree(hData);
 685
 686   return s;
 687 }
 688 #endif
 689
 690 void wxGetMousePosition( int* x, int* y )
 691 {
 692   POINT pt;
 693   GetCursorPos( & pt );
 694   *x = pt.x;
 695   *y = pt.y;
 696 };
 697
 698 // Return TRUE if we have a colour display
 699 bool wxColourDisplay(void)
 700 {
 701   HDC dc = ::GetDC(NULL);
 702   bool flag;
 703   int noCols = GetDeviceCaps(dc, NUMCOLORS);
 704   if ((noCols == -1) || (noCols > 2))
 705     flag = TRUE;
 706   else
 707     flag = FALSE;
 708   ReleaseDC(NULL, dc);
 709   return flag;
 710 }
 711
 712 // Returns depth of screen
 713 int wxDisplayDepth(void)
 714 {
 715   HDC dc = ::GetDC(NULL);
 716   int planes = GetDeviceCaps(dc, PLANES);
 717   int bitsPerPixel = GetDeviceCaps(dc, BITSPIXEL);
 718   int depth = planes*bitsPerPixel;
 719   ReleaseDC(NULL, dc);
 720   return depth;
 721 }
 722
 723 // Get size of display
 724 void wxDisplaySize(int *width, int *height)
 725 {
 726   HDC dc = ::GetDC(NULL);
 727   *width = GetDeviceCaps(dc, HORZRES); *height = GetDeviceCaps(dc, VERTRES);
 728   ReleaseDC(NULL, dc);
 729 }
 730