/[winpt]/trunk/Src/wptW32API.cpp
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revision 121 by twoaday, Mon Dec 12 11:19:56 2005 UTC revision 355 by twoaday, Sat Dec 3 18:59:01 2011 UTC
# Line 1  Line 1 
1  /* wptW32API.cpp - Common W32 API functions  /* wptW32API.cpp - Common W32 API functions
2   *      Copyright (C) 2001, 2002, 2003, 2005 Timo Schulz   *      Copyright (C) 2001-2003, 2005-2006, 2009 Timo Schulz
3   *   *
4   * This file is part of WinPT.   * This file is part of WinPT.
5   *   *
# Line 12  Line 12 
12   * but WITHOUT ANY WARRANTY; without even the implied warranty of   * but WITHOUT ANY WARRANTY; without even the implied warranty of
13   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14   * GNU General Public License for more details.   * GNU General Public License for more details.
  *  
  * You should have received a copy of the GNU General Public License  
  * along with WinPT; if not, write to the Free Software Foundation,  
  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA  
15   */   */
   
16  #ifdef HAVE_CONFIG_H  #ifdef HAVE_CONFIG_H
17  #include <config.h>  #include <config.h>
18  #endif  #endif
# Line 29  Line 24 
24  #include <shellapi.h>  #include <shellapi.h>
25  #include <shlobj.h>  #include <shlobj.h>
26  #include <commctrl.h>  #include <commctrl.h>
27    #include <time.h>
28    
29  #include "wptNLS.h"  #include "wptNLS.h"
30  #include "wptW32API.h"  #include "wptW32API.h"
31  #include "wptErrors.h"  #include "wptErrors.h"
32  #include "wptVersion.h"  #include "wptVersion.h"
33    #include "wptUTF8.h"
34  #include "wptTypes.h"  #include "wptTypes.h"
35    #include "StringBuffer.h"
36    
37    
38  extern "C" void _SHFree (void *p);  extern "C" void _SHFree (void *p);
39    
40    
41    /* Insert a new item into the menu @hm at position @pos. */
42    void
43    insert_menu_item (HMENU hm, int pos, UINT m_id, const char *text)
44    {
45        MENUITEMINFO mi;
46    
47        memset (&mi, 0, sizeof mi);
48        mi.cbSize = sizeof mi;
49        mi.fType = MF_STRING;
50        mi.dwTypeData = (char *)text;
51        mi.cch = strlen (text);
52        mi.wID = m_id;
53        mi.fMask = MIIM_ID|MIIM_DATA| MIIM_TYPE;
54        InsertMenuItem (hm, pos, FALSE, &mi);
55    }
56    
57    
58  static void  static void
59  set_menu_text_ext (HMENU menu, int by_pos, int m_uid, const char *text)  set_menu_text_ext (HMENU menu, int by_pos, int m_uid, const char *text)
60  {  {
# Line 56  set_menu_text_ext (HMENU menu, int by_po Line 71  set_menu_text_ext (HMENU menu, int by_po
71    
72  /* Set the text of a menu item @m_uid to @text. */  /* Set the text of a menu item @m_uid to @text. */
73  void  void
74  set_menu_text (HMENU menu, int m_uid, const char *text)  set_menu_text (HMENU menu, UINT m_uid, const char *text)
75  {  {
76      set_menu_text_ext (menu, 0, m_uid, text);      set_menu_text_ext (menu, 0, m_uid, text);
77  }  }
# Line 64  set_menu_text (HMENU menu, int m_uid, co Line 79  set_menu_text (HMENU menu, int m_uid, co
79    
80  /* Set the text of a menu item with the position @pos to @text. */  /* Set the text of a menu item with the position @pos to @text. */
81  void  void
82  set_menu_text_bypos (HMENU menu, int pos, const char *text)  set_menu_text_bypos (HMENU menu, UINT pos, const char *text)
83  {  {
84      set_menu_text_ext (menu, 1, pos, text);      set_menu_text_ext (menu, 1, pos, text);
85  }  }
# Line 72  set_menu_text_bypos (HMENU menu, int pos Line 87  set_menu_text_bypos (HMENU menu, int pos
87    
88  /* Set the state of a menu item @m_uid to @state. */  /* Set the state of a menu item @m_uid to @state. */
89  void  void
90  set_menu_state (HMENU menu, int m_uid, int state)  set_menu_state (HMENU menu, UINT m_uid, UINT state)
91  {        {      
92      MENUITEMINFO mii;      MENUITEMINFO mii;
93    
# Line 84  set_menu_state (HMENU menu, int m_uid, i Line 99  set_menu_state (HMENU menu, int m_uid, i
99  }  }
100    
101    
102    /* Retrieve the state of the menu item @m_uid and return it. */
103    UINT
104    get_menu_state (HMENU menu, UINT m_uid)
105    {
106        MENUITEMINFO mii;
107    
108        memset (&mii, 0, sizeof (mii));
109        mii.cbSize = sizeof (mii);
110        mii.fMask = MIIM_STATE;
111        GetMenuItemInfo (menu, m_uid, FALSE, &mii);
112        return mii.fState;
113    }
114    
115    
116  enum {  enum {
117      CDLG_FILE_OPEN = 0,      CDLG_FILE_OPEN = 0,
118      CDLG_FILE_SAVE = 1      CDLG_FILE_SAVE = 1
# Line 93  enum { Line 122  enum {
122     id can be either FILE_OPEN or FILE_SAVE.     id can be either FILE_OPEN or FILE_SAVE.
123     The return value is the file name or NULL if cancel was chosen. */     The return value is the file name or NULL if cancel was chosen. */
124  const char *  const char *
125  get_filename_dlg (HWND hwnd, int id, const char * title,  get_filename_dlg (HWND hwnd, int id, const char *title,
126                    const char * filter, const char * name)                    const char *filter, const char *name)
127  {  {
128      static char file[512] = "";      static char file[2*MAX_PATH+1] = "";
129        char _filter[512];
130        char workdir[MAX_PATH+1];
131        char *sel_file = NULL;
132      OPENFILENAME open;      OPENFILENAME open;
133            
134      if (name && strlen (name) < (sizeof (file)-1))      if (name && strlen (name) < (DIM (file)-1))
135          strcpy (file, name);          strcpy (file, name);
136      else      else
137          memset (file, 0, sizeof (file));          memset (file, 0, sizeof (file));
138      if (!filter)      if (!filter) {      
139          filter = _("All Files (*.*)\0*.*\0\0");          strcpy (_filter, _("All Files (*.*)"));
140      /* XXX: problem with gettext because of the 'artificial'          memcpy (_filter+strlen (_filter)+1, "*.*\0\0", 5);
141              double string termination!. */          filter = _filter;
142        }
143    
144        GetCurrentDirectory (MAX_PATH, workdir);
145      memset (&open, 0, sizeof (open));      memset (&open, 0, sizeof (open));
146      open.lStructSize = sizeof (OPENFILENAME);      open.lStructSize = sizeof (OPENFILENAME);
147      open.hInstance = glob_hinst;      open.hInstance = glob_hinst;
# Line 114  get_filename_dlg (HWND hwnd, int id, con Line 149  get_filename_dlg (HWND hwnd, int id, con
149      open.lpstrFilter = filter;      open.lpstrFilter = filter;
150      open.hwndOwner = hwnd;      open.hwndOwner = hwnd;
151      open.lpstrFile = file;      open.lpstrFile = file;
152      open.nMaxFile = sizeof (file) - 1;      open.nMaxFile = DIM (file) - 1;
153      if (id == CDLG_FILE_OPEN)      if (id == CDLG_FILE_OPEN)
154          open.Flags = OFN_FILEMUSTEXIST|OFN_PATHMUSTEXIST;          open.Flags = OFN_FILEMUSTEXIST|OFN_PATHMUSTEXIST;
155      else      else
156          open.Flags = OFN_OVERWRITEPROMPT;          open.Flags = OFN_OVERWRITEPROMPT;
157    
158      if (id == CDLG_FILE_OPEN && GetOpenFileName (&open))      if (id == CDLG_FILE_OPEN && GetOpenFileName (&open))
159          return open.lpstrFile;          sel_file = open.lpstrFile;
160      else if (id == CDLG_FILE_SAVE && GetSaveFileName (&open))      else if (id == CDLG_FILE_SAVE && GetSaveFileName (&open))
161          return open.lpstrFile;          sel_file = open.lpstrFile;
162        SetCurrentDirectory (workdir);
163            
164      return NULL;      return sel_file;
165  }  }
166    
167  const char*  const char*
# Line 148  get_fileopen_dlg (HWND hwnd, const char Line 184  get_fileopen_dlg (HWND hwnd, const char
184  const char*  const char*
185  get_folder_dlg (HWND hwnd, const char *title, const char *name)  get_folder_dlg (HWND hwnd, const char *title, const char *name)
186  {  {
187      static char folder[MAX_PATH+1] = "";      static char folder[2*MAX_PATH+1] = "";
188      BROWSEINFO bi;      BROWSEINFO bi;
189      ITEMIDLIST *il;      ITEMIDLIST *il;
190    
# Line 161  get_folder_dlg (HWND hwnd, const char *t Line 197  get_folder_dlg (HWND hwnd, const char *t
197      else      else
198          memset (folder, 0, sizeof (folder));          memset (folder, 0, sizeof (folder));
199      il = SHBrowseForFolder (&bi);      il = SHBrowseForFolder (&bi);
200      if (il) {      if (il != NULL) {
201          SHGetPathFromIDList (il, folder);          SHGetPathFromIDList (il, folder);
202          _SHFree (il);          _SHFree (il);
203          return folder;          return folder;
# Line 223  set_clip_text (HWND hwnd, const char *te Line 259  set_clip_text (HWND hwnd, const char *te
259          BUG (NULL);          BUG (NULL);
260      p = (char *) GlobalLock (clipmem);      p = (char *) GlobalLock (clipmem);
261      if (p == NULL) {      if (p == NULL) {
262          rc = WPTERR_GENERAL;;          CloseClipboard ();
263          goto leave;              GlobalFree (clipmem);
264            return WPTERR_GENERAL;
265      }      }
266      memcpy (p, text, nbytes);      memcpy (p, text, nbytes);
267      p[nbytes] = '\0';      p[nbytes] = '\0';
268            
     GlobalUnlock (clipmem);  
269      SetClipboardData (CF_TEXT, clipmem);      SetClipboardData (CF_TEXT, clipmem);
270            GlobalUnlock (clipmem);
 leave:  
271      CloseClipboard ();      CloseClipboard ();
272        GlobalFree (clipmem);
273        
274      return rc;      return rc;
275  } /* set_clip_text */  }
276    
277    
278  /* Append or prepend some text to the clipboard contents.  /* Append or prepend some text to the clipboard contents.
# Line 243  leave: Line 280  leave:
280  int  int
281  set_clip_text2 (HWND hwnd, const char *text, int nbytes, int as_footer)  set_clip_text2 (HWND hwnd, const char *text, int nbytes, int as_footer)
282  {  {
283        const char *fmt;
284      char *p, *new_text;      char *p, *new_text;
285    
286      p = get_clip_text (hwnd);      p = get_clip_text (hwnd);
287      if (!p)      if (!p)
288          return WPTERR_CLIP_GET;          return WPTERR_CLIP_GET;
289      new_text = new char [strlen (p)+strlen (text)+8];      if (as_footer == 0)
290            fmt = "%s\r\n%s\r\n\r\n";
291        else
292            fmt = "%s\n%s\n\n";
293        new_text = new char [strlen (p)+strlen (text)+strlen (fmt)+2];
294      if (!new_text)      if (!new_text)
295          BUG (0);          BUG (0);
296      if (as_footer == 0)      if (as_footer == 0)
297          sprintf (new_text, "%s\r\n%s\r\n\r\n", text, p);          sprintf (new_text, fmt, text, p);
298      else      else
299          sprintf (new_text, "%s\n%s\n\n", p, text);          sprintf (new_text, fmt, p, text);
300      set_clip_text (hwnd, new_text, strlen (new_text)+1);      set_clip_text (hwnd, new_text, strlen (new_text)+1);
301      free_if_alloc (p);      free_if_alloc (p);
302      free_if_alloc (new_text);      free_if_alloc (new_text);
# Line 271  make_filename (const char *path, const c Line 313  make_filename (const char *path, const c
313      char *p;      char *p;
314      size_t size = 0;      size_t size = 0;
315    
316      if( path && *path )      if (path && *path)
317          size += strlen( path );          size += strlen (path);
318      if( file && *file )      if (file && *file)
319          size += strlen( file );          size += strlen (file);
320      if( ext && *ext )      if (ext && *ext)
321          size += strlen( ext );          size += strlen (ext);
322      p = new char[size + 4];      p = new char[size + 4];
323      memset( p, 0, size );      if (!p)
324      if( path ) {          BUG (0);
325          strcat( p, path );      memset (p, 0, size);
326          if( path[strlen( path ) -1] != '\\' )      if (path) {
327              strcat( p, "\\" );          strcat (p, path);
328      }          if (path[strlen (path) -1] != '\\')
329      if( file )              strcat (p, "\\");
330          strcat( p, file );      }
331      if( ext ) {      if (file != NULL)
332          strcat( p, "." );          strcat (p, file);
333          strcat( p, ext );      if (ext != NULL) {
334            strcat (p, ".");
335            strcat (p, ext);
336      }      }
337      return p;      return p;
338  }  }
339    
340    
341    /* Generates a file name from a special dirctory. */
342    char*
343    make_special_filename (int folder, const char *file, const char *ext)
344    {
345        BOOL ec;
346        char path[MAX_PATH+1], *p;
347        size_t n=0;
348    
349        /* MSDN: buf must be at least MAX_PATH=256 bytes */
350        ec = SHGetSpecialFolderPath (HWND_DESKTOP, path, folder, TRUE);
351        if (ec != 1) {
352            log_debug ("SHGetSpecialFolderPath() failed\r\n", (int)GetLastError ());
353            return NULL;
354        }
355    
356        n = strlen (path)+1;
357        if (file)
358            n += strlen (file)+1;
359        if (ext)
360            n += strlen (ext)+1;
361        p = new char[n+2];
362        if (!p)
363            BUG (0);
364        memset (p, 0, n+2);
365        strcpy (p, path);    
366        if (file) {
367            strcat (p, "\\");
368            strcat (p, file);
369        }
370        if (ext)
371            strcat (p, ext);
372        return p;
373    }
374    
375    
376  /* return 0 if the file @fname exists, otherwise >0. */  /* return 0 if the file @fname exists, otherwise >0. */
377  int  int
378  file_exist_check (const char *fname)  file_exist_check (const char *fname)
# Line 339  get_file_size (const char *fname) Line 418  get_file_size (const char *fname)
418  }  }
419    
420    
 int  
 init_file_lock( LOCK *ctx, const char *file )  
 {  
       
     ctx->size = get_file_size( file );  
     ctx->file = m_strdup( file );  
     ctx->fh = CreateFile( file, GENERIC_READ, FILE_SHARE_READ, NULL,  
                          OPEN_ALWAYS, 0, NULL );  
     if( ctx->fh == INVALID_HANDLE_VALUE )  
         return WPTERR_GENERAL;  
     if( LockFile( ctx->fh, 0, 0, ctx->size, 0 ) == FALSE ) {  
         CloseHandle( ctx->fh );  
         ctx->fh = INVALID_HANDLE_VALUE;  
         ctx->size = 0;  
         free( ctx->file );  
         return WPTERR_GENERAL;  
     }  
     return 0;  
 } /* init_file_lock */  
   
   
 void  
 release_file_lock( LOCK *ctx )  
 {  
     free_if_alloc( ctx->file );  
     ctx->file = NULL;  
     ctx->size = 0;  
     CloseHandle( ctx->fh );  
 } /* release_file_lock */  
   
   
421  /* Start a dialog with the exception that before it is checked that the  /* Start a dialog with the exception that before it is checked that the
422     dialog is not already openened. */     dialog is not already openened. */
423  int  int
# Line 394  msg_box (HWND hwnd, const char *text, co Line 442  msg_box (HWND hwnd, const char *text, co
442  }  }
443    
444    
 /* Safe strdup version (C++ version). */  
 char*  
 m_strdup (const char *str)  
 {  
     char *p = new char[strlen (str) + 1];  
     if (!p)  
         BUG (NULL);  
     strcpy (p, str);  
     return p;  
 }  
   
   
445  /* Center the hwndChild relative to parent.  /* Center the hwndChild relative to parent.
446     The style param allows to specificy additional styles (like topmost). */     The style param allows to specificy additional styles (like topmost). */
447  void  void
# Line 451  center_window2 (HWND hwndChild, HWND par Line 487  center_window2 (HWND hwndChild, HWND par
487    
488  /* Center the given hwndChild window with no special style. */  /* Center the given hwndChild window with no special style. */
489  void  void
490  center_window (HWND hwndChild, HWND hwndParent)  center_window (HWND child, HWND parent)
491  {  {
492      center_window2 (hwndChild, hwndParent, NULL);      center_window2 (child, parent, NULL);
493    }
494    
495    
496    
497    
498    /* Return date in a format which complies with the
499       locale user settings. */
500    const char*
501    get_locale_date (long tm_t, char *buf, DWORD buflen)
502    {
503        SYSTEMTIME st;
504        struct tm *ptm;
505    
506        ptm = localtime (&tm_t);
507        memset (&st, 0, sizeof (st));
508        st.wYear = (WORD)ptm->tm_year+1900;
509        st.wMonth = (WORD)ptm->tm_mon+1;
510        st.wDay = (WORD)ptm->tm_mday;
511        if (!GetDateFormat (LOCALE_USER_DEFAULT, DATE_SHORTDATE, &st,
512                            NULL, buf, buflen))
513            return NULL;
514        return buf;
515    }
516    
517    /* Return the time in a format which complies with the locale user
518       settings. */
519    const char*
520    get_locale_time (long tm_t, char *buf, DWORD buflen)
521    {
522        SYSTEMTIME st;
523        struct tm *ptm;
524    
525        ptm = localtime (&tm_t);
526        memset (&st, 0, sizeof (st));
527        st.wMinute = (WORD)ptm->tm_min;
528        st.wHour = (WORD)ptm->tm_hour;
529        st.wSecond = (WORD)ptm->tm_sec;
530    
531        if (!GetTimeFormat (LOCALE_USER_DEFAULT, TIME_FORCE24HOURFORMAT, &st,
532                            NULL, buf, buflen))
533            return NULL;
534        return buf;
535    }
536    
537    
538    /* Return a combination of date+time which complies to the
539       local user settings. */
540    const char*
541    get_locale_timedate (long tm_t, char *buf, DWORD buflen)
542    {
543        DWORD nleft = buflen;
544    
545        if (!get_locale_date (tm_t, buf, buflen))
546            return NULL;
547        nleft -= strlen (buf)+1;
548        if (nleft < 1)
549            return NULL;
550        strcat (buf, " ");
551        nleft--;
552        if (!get_locale_time (tm_t, buf+strlen (buf), nleft))
553            return NULL;
554        return buf;
555  }  }
556    
557    
558  /* Retrieve the product verion of the given file @fname.  /* Generate a temporary file name by using the users
559     Format: MAJOR.MINOR.PATCH1.PATCH2     temp path and optionally a name @name provided by the caller.
560     Return value: 0 on success. */     Return value: 0 on success. */
561  int  int
562  get_file_version (const char *fname, WORD *major, WORD *minor,  get_temp_name (char *buf, DWORD buflen, const char *name)
                   WORD *patch1, WORD *patch2)  
563  {  {
564      VS_FIXEDFILEINFO *inf = {0};      char tmp[32];
     char file[MAX_PATH+1] = {0};  
     LPVOID buf, data;  
     DWORD arg;  
     DWORD size;  
     UINT qlen;  
   
     strncpy (file, fname, MAX_PATH);  
     size = GetFileVersionInfoSize (file, &arg);  
     if (!size)  
         return -1;  
     buf = (LPVOID)new CHAR[size];  
     if (!buf)  
         BUG (NULL);  
     GetFileVersionInfo (file, 0, size, buf);  
565    
566      qlen=0;      
567      VerQueryValue (buf, "\\", &data, &qlen);      if (!name) {
568      if (!qlen) {          _snprintf (tmp, DIM (tmp)-1, "%08lX", GetTickCount ());
569          delete [] (char*)buf;          name = tmp;
         return -1;  
570      }      }
     inf = (VS_FIXEDFILEINFO*)data;  
571    
572      if (major)      if (!GetTempPath (buflen - strlen (name) -2, buf)) {
573          *major = HIWORD (inf->dwProductVersionMS);          log_debug ("GetTempPath() failed ec=%d\n", (int)GetLastError ());
574      if (minor)          return -1;
575          *minor = LOWORD (inf->dwProductVersionMS);      }
     if (patch1)  
         *patch1 = HIWORD (inf->dwProductVersionLS);      
     if (patch2)  
         *patch2 = LOWORD (inf->dwProductVersionLS);  
576    
577      delete [] (char*)buf;      strcat (buf, name);
578      return 0;      return 0;
579  }  }
580    
581    
582  void  void
583  set_active_window( HWND dlg)  ListBox_AddString_utf8 (HWND lb, const char *txt)
584  {        {
585      activ_hwnd = dlg;      char *utf8_txt;
 } /* set_active_window */  
586    
587  void      utf8_txt = utf8_to_native (txt);
588  reset_active_window( void )      SendMessage (lb, LB_ADDSTRING, 0, (LPARAM)(LPCSTR)(utf8_txt));
589  {            safe_free (utf8_txt);
590      activ_hwnd = NULL;  }
 } /* reset_active_window */  
591    
592    
593  static DWORD CALLBACK  void
594  reminder_thread (void *ctx)  ComboBox_AddString_utf8 (HWND cb, const char *txt)
595  {  {
596      reminder_ctx_s *c = (reminder_ctx_s *)ctx;      char *utf8_txt;
597    
598      Sleep( c->msecs );      utf8_txt = utf8_to_native (txt);
599      SetForegroundWindow( activ_hwnd );      SendMessage ((cb), CB_ADDSTRING, 0, (LPARAM)(LPCSTR)(utf8_txt));
600        safe_free (utf8_txt);
601    }
602    
     return 0;  
 } /* reminder_thread */  
603    
604    /* GetDlgItemText replacement with UTF8 support. */
605    int
606    GetDlgItemText_utf8 (HWND dlg, int id, char **r_txt)
607    {
608        int len = GetWindowTextLength (GetDlgItem (dlg, id));
609        char *txt;
610    
611        *r_txt = NULL;
612        if (len < 1)
613            return 0;
614        txt = new char[len+2];
615        if (!txt)
616            BUG (NULL);
617        GetDlgItemText (dlg, id, txt, len+1);
618        *r_txt = native_to_utf8 (txt);
619        free_if_alloc (txt);
620        return len;
621    }
622    
623  HANDLE  int
624  window_reminder( struct reminder_ctx_s *ctx )  html_help_show (int map_id)
625  {  {
626      DWORD tid = 0;      STARTUPINFO si;
627            PROCESS_INFORMATION pi;
628      return CreateThread( NULL, 0, reminder_thread, ctx, 0, &tid );      SECURITY_ATTRIBUTES sec_attr;
629  } /* window_reminder */      char path[2*MAX_PATH+1];
630        
631        memset (&sec_attr, 0, sizeof (sec_attr));
632        memset (&si, 0, sizeof (si));
633        si.cb = sizeof (STARTUPINFO);
634        memset (&pi, 0, sizeof (pi));
635        //hh.exe -mapid 40 "winpt.$lang.chm"
636        
637        _snprintf (path, 2*MAX_PATH, "hh.exe -mapid %d winpt.%s.chm",
638                   map_id, gettext_get_langid ());
639        CreateProcess (NULL, path, &sec_attr, &sec_attr,
640                       FALSE, 0, NULL, NULL, &si, &pi);
641        CloseHandle (pi.hProcess);
642        CloseHandle (pi.hThread);
643        return 0;
644    }
645                      
646      
647    /* Return TRUE if the current user has admin privileges. */
648    BOOL
649    user_is_admin (void)
650    {
651        SID_IDENTIFIER_AUTHORITY SystemSidAuthority = SECURITY_NT_AUTHORITY;
652        HANDLE hd;
653        TOKEN_GROUPS  *ptg = NULL;
654        DWORD ngtoken;
655        DWORD i;
656        BOOL admin = FALSE;
657        PSID psid = 0;
658    
659        if (!OpenThreadToken (GetCurrentThread (), TOKEN_QUERY, FALSE, &hd) &&
660            !OpenProcessToken (GetCurrentProcess (), TOKEN_QUERY, &hd))
661            return FALSE;
662        
663        if (!GetTokenInformation (hd, TokenGroups, NULL, 0, &ngtoken) &&
664            GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
665            ptg = (TOKEN_GROUPS*)GlobalAlloc (GPTR, ngtoken);
666            if (!ptg)
667                return FALSE;
668    
669            if (!GetTokenInformation (hd, TokenGroups, ptg, ngtoken, &ngtoken)) {
670                GlobalFree (ptg);
671                return FALSE;
672            }
673            AllocateAndInitializeSid (&SystemSidAuthority,
674                                      2, SECURITY_BUILTIN_DOMAIN_RID,
675                                      DOMAIN_ALIAS_RID_ADMINS,
676                                      0, 0, 0, 0, 0, 0,
677                                      &psid);
678            for (i = 0; i < ptg->GroupCount; i++) {
679                if (EqualSid (ptg->Groups[i].Sid, psid)) {
680                    admin = TRUE;
681                    break;
682                }
683            }
684            FreeSid (psid);
685            GlobalFree (ptg);
686        }
687    
688        CloseHandle (hd);
689        return admin;
690    }
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