src/msw/volume.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/msw/volume.cpp
   3 // Purpose:     wxFSVolume - encapsulates system volume information
   4 // Author:      George Policello
   5 // Modified by:
   6 // Created:     28 Jan 02
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2002 George Policello
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  21     #pragma implementation "fsvolume.h"
  22 #endif
  23
  24 #include "wx/wxprec.h"
  25
  26 #ifdef __BORLANDC__
  27     #pragma hdrstop
  28 #endif
  29
  30 #if wxUSE_FSVOLUME
  31
  32 #ifndef WX_PRECOMP
  33     #if wxUSE_GUI
  34         #include "wx/icon.h"
  35     #endif
  36     #include "wx/intl.h"
  37 #endif // WX_PRECOMP
  38
  39 #include "wx/dir.h"
  40 #include "wx/hashmap.h"
  41 #include "wx/dynlib.h"
  42 #include "wx/arrimpl.cpp"
  43
  44 #include "wx/volume.h"
  45
  46 #include <shellapi.h>
  47 #include "wx/msw/missing.h"
  48
  49 #if wxUSE_BASE
  50
  51 //+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  52 // Dynamic library function defs.
  53 //+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  54
  55 static wxDynamicLibrary s_mprLib;
  56
  57 typedef DWORD (WINAPI* WNetOpenEnumPtr)(DWORD, DWORD, DWORD, LPNETRESOURCE, LPHANDLE);
  58 typedef DWORD (WINAPI* WNetEnumResourcePtr)(HANDLE, LPDWORD, LPVOID, LPDWORD);
  59 typedef DWORD (WINAPI* WNetCloseEnumPtr)(HANDLE);
  60
  61 static WNetOpenEnumPtr s_pWNetOpenEnum;
  62 static WNetEnumResourcePtr s_pWNetEnumResource;
  63 static WNetCloseEnumPtr s_pWNetCloseEnum;
  64
  65 //+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  66 // Globals/Statics
  67 //+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  68 static long s_cancelSearch = FALSE;
  69
  70 struct FileInfo
  71 {
  72     FileInfo(unsigned flag=0, wxFSVolumeKind type=wxFS_VOL_OTHER) :
  73         m_flags(flag), m_type(type) {}
  74
  75     FileInfo(const FileInfo& other) { *this = other; }
  76     FileInfo& operator=(const FileInfo& other)
  77     {
  78         m_flags = other.m_flags;
  79         m_type = other.m_type;
  80         return *this;
  81     }
  82
  83     unsigned m_flags;
  84     wxFSVolumeKind m_type;
  85 };
  86 WX_DECLARE_STRING_HASH_MAP(FileInfo, FileInfoMap);
  87 // Cygwin bug (?) destructor for global s_fileInfo is called twice...
  88 static FileInfoMap& GetFileInfoMap()
  89 {
  90     static FileInfoMap s_fileInfo(25);
  91
  92     return s_fileInfo;
  93 }
  94 #define s_fileInfo (GetFileInfoMap())
  95
  96 //+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  97 // Local helper functions.
  98 //+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  99
 100 //=============================================================================
 101 // Function: GetBasicFlags
 102 // Purpose: Set basic flags, primarily wxFS_VOL_REMOTE and wxFS_VOL_REMOVABLE.
 103 // Notes: - Local and mapped drives are mounted by definition.  We have no
 104 //          way to determine mounted status of network drives, so assume that
 105 //          all drives are mounted, and let the caller decide otherwise.
 106 //        - Other flags are 'best guess' from type of drive.  The system will
 107 //          not report the file attributes with any degree of accuracy.
 108 //=============================================================================
 109 static unsigned GetBasicFlags(const wxChar* filename)
 110 {
 111     unsigned flags = wxFS_VOL_MOUNTED;
 112
 113     //----------------------------------
 114     // 'Best Guess' based on drive type.
 115     //----------------------------------
 116     wxFSVolumeKind type;
 117     switch(GetDriveType(filename))
 118     {
 119     case DRIVE_FIXED:
 120         type = wxFS_VOL_DISK;
 121         break;
 122
 123     case DRIVE_REMOVABLE:
 124         flags |= wxFS_VOL_REMOVABLE;
 125         type = wxFS_VOL_FLOPPY;
 126         break;
 127
 128     case DRIVE_CDROM:
 129         flags |= wxFS_VOL_REMOVABLE | wxFS_VOL_READONLY;
 130         type = wxFS_VOL_CDROM;
 131         break;
 132
 133     case DRIVE_REMOTE:
 134         flags |= wxFS_VOL_REMOTE;
 135         type = wxFS_VOL_NETWORK;
 136         break;
 137
 138     case DRIVE_NO_ROOT_DIR:
 139         flags &= ~wxFS_VOL_MOUNTED;
 140         type = wxFS_VOL_OTHER;
 141         break;
 142
 143     default:
 144         type = wxFS_VOL_OTHER;
 145         break;
 146     }
 147
 148     //-----------------------------------------------------------------------
 149     // The following will most likely will not modify anything not set above,
 150     // and will not work at all for network shares or empty CD ROM drives.
 151     // But it is a good check if the Win API ever gets better about reporting
 152     // this information.
 153     //-----------------------------------------------------------------------
 154     SHFILEINFO fi;
 155     long rc;
 156     rc = SHGetFileInfo(filename, 0, &fi, sizeof(fi), SHGFI_ATTRIBUTES );
 157     if (!rc)
 158     {
 159         wxLogError(_("Cannot read typename from '%s'!"), filename);
 160     }
 161     else
 162     {
 163         if (fi.dwAttributes & SFGAO_READONLY)
 164             flags |= wxFS_VOL_READONLY;
 165         if (fi.dwAttributes & SFGAO_REMOVABLE)
 166             flags |= wxFS_VOL_REMOVABLE;
 167     }
 168
 169     //------------------
 170     // Flags are cached.
 171     //------------------
 172     s_fileInfo[filename] = FileInfo(flags, type);
 173
 174     return flags;
 175 } // GetBasicFlags
 176
 177 //=============================================================================
 178 // Function: FilteredAdd
 179 // Purpose: Add a file to the list if it meets the filter requirement.
 180 // Notes: - See GetBasicFlags for remarks about the Mounted flag.
 181 //=============================================================================
 182 static bool FilteredAdd(wxArrayString& list, const wxChar* filename,
 183                         unsigned flagsSet, unsigned flagsUnset)
 184 {
 185     bool accept = TRUE;
 186     unsigned flags = GetBasicFlags(filename);
 187
 188     if (flagsSet & wxFS_VOL_MOUNTED && !(flags & wxFS_VOL_MOUNTED))
 189         accept = FALSE;
 190     else if (flagsUnset & wxFS_VOL_MOUNTED && (flags & wxFS_VOL_MOUNTED))
 191         accept = FALSE;
 192     else if (flagsSet & wxFS_VOL_REMOVABLE && !(flags & wxFS_VOL_REMOVABLE))
 193         accept = FALSE;
 194     else if (flagsUnset & wxFS_VOL_REMOVABLE && (flags & wxFS_VOL_REMOVABLE))
 195         accept = FALSE;
 196     else if (flagsSet & wxFS_VOL_READONLY && !(flags & wxFS_VOL_READONLY))
 197         accept = FALSE;
 198     else if (flagsUnset & wxFS_VOL_READONLY && (flags & wxFS_VOL_READONLY))
 199         accept = FALSE;
 200     else if (flagsSet & wxFS_VOL_REMOTE && !(flags & wxFS_VOL_REMOTE))
 201         accept = FALSE;
 202     else if (flagsUnset & wxFS_VOL_REMOTE && (flags & wxFS_VOL_REMOTE))
 203         accept = FALSE;
 204
 205     // Add to the list if passed the filter.
 206     if (accept)
 207         list.Add(filename);
 208
 209     return accept;
 210 } // FilteredAdd
 211
 212 //=============================================================================
 213 // Function: BuildListFromNN
 214 // Purpose: Append or remove items from the list
 215 // Notes: - There is no way to find all disconnected NN items, or even to find
 216 //          all items while determining which are connected and not.  So this
 217 //          function will find either all items or connected items.
 218 //=============================================================================
 219 static void BuildListFromNN(wxArrayString& list, NETRESOURCE* pResSrc,
 220                             unsigned flagsSet, unsigned flagsUnset)
 221 {
 222     HANDLE hEnum;
 223     int rc;
 224
 225     //-----------------------------------------------
 226     // Scope may be all drives or all mounted drives.
 227     //-----------------------------------------------
 228     unsigned scope = RESOURCE_GLOBALNET;
 229     if (flagsSet & wxFS_VOL_MOUNTED)
 230         scope = RESOURCE_CONNECTED;
 231
 232     //----------------------------------------------------------------------
 233     // Enumerate all items, adding only non-containers (ie. network shares).
 234     // Containers cause a recursive call to this function for their own
 235     // enumeration.
 236     //----------------------------------------------------------------------
 237     if (rc = s_pWNetOpenEnum(scope, RESOURCETYPE_DISK, 0, pResSrc, &hEnum), rc == NO_ERROR)
 238     {
 239         DWORD count = 1;
 240         DWORD size = 256;
 241         NETRESOURCE* pRes = (NETRESOURCE*)malloc(size);
 242         memset(pRes, 0, sizeof(NETRESOURCE));
 243         while (rc = s_pWNetEnumResource(hEnum, &count, pRes, &size), rc == NO_ERROR || rc == ERROR_MORE_DATA)
 244         {
 245             if (s_cancelSearch)
 246                 break;
 247
 248             if (rc == ERROR_MORE_DATA)
 249             {
 250                 pRes = (NETRESOURCE*)realloc(pRes, size);
 251                 count = 1;
 252             }
 253             else if (count == 1)
 254             {
 255                 // Enumerate the container.
 256                 if (pRes->dwUsage & RESOURCEUSAGE_CONTAINER)
 257                 {
 258                     BuildListFromNN(list, pRes, flagsSet, flagsUnset);
 259                 }
 260
 261                 // Add the network share.
 262                 else
 263                 {
 264                     wxString filename(pRes->lpRemoteName);
 265
 266                     if (filename.Len())
 267                     {
 268                         if (filename.Last() != '\\')
 269                             filename.Append('\\');
 270
 271                         // The filter function will not know mounted from unmounted, and neither do we unless
 272                         // we are iterating using RESOURCE_CONNECTED, in which case they all are mounted.
 273                         // Volumes on disconnected servers, however, will correctly show as unmounted.
 274                         FilteredAdd(list, filename, flagsSet, flagsUnset&~wxFS_VOL_MOUNTED);
 275                         if (scope == RESOURCE_GLOBALNET)
 276                             s_fileInfo[filename].m_flags &= ~wxFS_VOL_MOUNTED;
 277                     }
 278                 }
 279             }
 280             else if (count == 0)
 281                 break;
 282         }
 283         free(pRes);
 284         s_pWNetCloseEnum(hEnum);
 285     }
 286 } // BuildListFromNN
 287
 288 //=============================================================================
 289 // Function: CompareFcn
 290 // Purpose: Used to sort the NN list alphabetically, case insensitive.
 291 //=============================================================================
 292 static int CompareFcn(wxString* first, wxString* second)
 293 {
 294     return wxStricmp(first->c_str(), second->c_str());
 295 } // CompareFcn
 296
 297 //=============================================================================
 298 // Function: BuildRemoteList
 299 // Purpose: Append Network Neighborhood items to the list.
 300 // Notes: - Mounted gets transalated into Connected.  FilteredAdd is told
 301 //          to ignore the Mounted flag since we need to handle it in a weird
 302 //          way manually.
 303 //        - The resulting list is sorted alphabetically.
 304 //=============================================================================
 305 static bool BuildRemoteList(wxArrayString& list, NETRESOURCE* pResSrc,
 306                             unsigned flagsSet, unsigned flagsUnset)
 307 {
 308     // NN query depends on dynamically loaded library.
 309     if (!s_pWNetOpenEnum || !s_pWNetEnumResource || !s_pWNetCloseEnum)
 310     {
 311         wxLogError(_("Failed to load mpr.dll."));
 312         return FALSE;
 313     }
 314
 315     // Don't waste time doing the work if the flags conflict.
 316     if (flagsSet & wxFS_VOL_MOUNTED && flagsUnset & wxFS_VOL_MOUNTED)
 317         return FALSE;
 318
 319     //----------------------------------------------
 320     // Generate the list according to the flags set.
 321     //----------------------------------------------
 322     BuildListFromNN(list, pResSrc, flagsSet, flagsUnset);
 323     list.Sort(CompareFcn);
 324
 325     //-------------------------------------------------------------------------
 326     // If mounted only is requested, then we only need one simple pass.
 327     // Otherwise, we need to build a list of all NN volumes and then apply the
 328     // list of mounted drives to it.
 329     //-------------------------------------------------------------------------
 330     if (!(flagsSet & wxFS_VOL_MOUNTED))
 331     {
 332         // generate.
 333         wxArrayString mounted;
 334         BuildListFromNN(mounted, pResSrc, flagsSet | wxFS_VOL_MOUNTED, flagsUnset & ~wxFS_VOL_MOUNTED);
 335         mounted.Sort(CompareFcn);
 336
 337         // apply list from bottom to top to preserve indexes if removing items.
 338         int iList = list.GetCount()-1;
 339         int iMounted;
 340         for (iMounted = mounted.GetCount()-1; iMounted >= 0 && iList >= 0; iMounted--)
 341         {
 342             int compare;
 343             wxString all(list[iList]);
 344             wxString mount(mounted[iMounted]);
 345
 346             while (compare =
 347                      wxStricmp(list[iList].c_str(), mounted[iMounted].c_str()),
 348                    compare > 0 && iList >= 0)
 349             {
 350                 iList--;
 351                 all = list[iList];
 352             }
 353
 354
 355             if (compare == 0)
 356             {
 357                 // Found the element.  Remove it or mark it mounted.
 358                 if (flagsUnset & wxFS_VOL_MOUNTED)
 359                     list.RemoveAt(iList);
 360                 else
 361                     s_fileInfo[list[iList]].m_flags |= wxFS_VOL_MOUNTED;
 362
 363             }
 364
 365             iList--;
 366         }
 367     }
 368
 369     return TRUE;
 370 } // BuildRemoteList
 371
 372 //+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 373 // wxFSVolume
 374 //+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 375
 376 //=============================================================================
 377 // Function: GetVolumes
 378 // Purpose: Generate and return a list of all volumes (drives) available.
 379 // Notes:
 380 //=============================================================================
 381 wxArrayString wxFSVolumeBase::GetVolumes(int flagsSet, int flagsUnset)
 382 {
 383     InterlockedExchange(&s_cancelSearch, FALSE);     // reset
 384
 385     if (!s_mprLib.IsLoaded() && s_mprLib.Load(_T("mpr.dll")))
 386     {
 387 #ifdef UNICODE
 388         s_pWNetOpenEnum = (WNetOpenEnumPtr)s_mprLib.GetSymbol(_T("WNetOpenEnumW"));
 389         s_pWNetEnumResource = (WNetEnumResourcePtr)s_mprLib.GetSymbol(_T("WNetEnumResourceW"));
 390 #else
 391         s_pWNetOpenEnum = (WNetOpenEnumPtr)s_mprLib.GetSymbol(_T("WNetOpenEnumA"));
 392         s_pWNetEnumResource = (WNetEnumResourcePtr)s_mprLib.GetSymbol(_T("WNetEnumResourceA"));
 393 #endif
 394         s_pWNetCloseEnum = (WNetCloseEnumPtr)s_mprLib.GetSymbol(_T("WNetCloseEnum"));
 395     }
 396
 397     wxArrayString list;
 398
 399     //-------------------------------
 400     // Local and mapped drives first.
 401     //-------------------------------
 402     // Allocate the required space for the API call.
 403     size_t chars = GetLogicalDriveStrings(0, 0);
 404     TCHAR* buf = new TCHAR[chars+1];
 405
 406     // Get the list of drives.
 407     chars = GetLogicalDriveStrings(chars, buf);
 408
 409     // Parse the list into an array, applying appropriate filters.
 410     TCHAR *pVol;
 411     pVol = buf;
 412     while (*pVol)
 413     {
 414         FilteredAdd(list, pVol, flagsSet, flagsUnset);
 415         pVol = pVol + wxStrlen(pVol) + 1;
 416     }
 417
 418     // Cleanup.
 419     delete[] buf;
 420
 421     //---------------------------
 422     // Network Neighborhood next.
 423     //---------------------------
 424
 425     // not exclude remote and not removable
 426     if (!(flagsUnset & wxFS_VOL_REMOTE) &&
 427         !(flagsSet & wxFS_VOL_REMOVABLE)
 428        )
 429     {
 430         // The returned list will be sorted alphabetically.  We don't pass
 431         // our in since we don't want to change to order of the local drives.
 432         wxArrayString nn;
 433         if (BuildRemoteList(nn, 0, flagsSet, flagsUnset))
 434         {
 435             for (size_t idx = 0; idx < nn.GetCount(); idx++)
 436                 list.Add(nn[idx]);
 437         }
 438     }
 439
 440     return list;
 441 } // GetVolumes
 442
 443 //=============================================================================
 444 // Function: CancelSearch
 445 // Purpose: Instruct an active search to stop.
 446 // Notes: - This will only sensibly be called by a thread other than the one
 447 //          performing the search.  This is the only thread-safe function
 448 //          provided by the class.
 449 //=============================================================================
 450 void wxFSVolumeBase::CancelSearch()
 451 {
 452     InterlockedExchange(&s_cancelSearch, TRUE);
 453 } // CancelSearch
 454
 455 //=============================================================================
 456 // Function: constructor
 457 // Purpose: default constructor
 458 //=============================================================================
 459 wxFSVolumeBase::wxFSVolumeBase()
 460 {
 461     m_isOk = FALSE;
 462 } // wxVolume
 463
 464 //=============================================================================
 465 // Function: constructor
 466 // Purpose: constructor that calls Create
 467 //=============================================================================
 468 wxFSVolumeBase::wxFSVolumeBase(const wxString& name)
 469 {
 470     Create(name);
 471 } // wxVolume
 472
 473 //=============================================================================
 474 // Function: Create
 475 // Purpose: Finds, logs in, etc. to the request volume.
 476 //=============================================================================
 477 bool wxFSVolumeBase::Create(const wxString& name)
 478 {
 479     // assume fail.
 480     m_isOk = FALSE;
 481
 482     // supplied.
 483     m_volName = name;
 484
 485     // Display name.
 486     SHFILEINFO fi;
 487     long rc = SHGetFileInfo(m_volName, 0, &fi, sizeof(fi), SHGFI_DISPLAYNAME);
 488     if (!rc)
 489     {
 490         wxLogError(_("Cannot read typename from '%s'!"), m_volName.c_str());
 491         return m_isOk;
 492     }
 493     m_dispName = fi.szDisplayName;
 494
 495     // all tests passed.
 496     return m_isOk = TRUE;
 497 } // Create
 498
 499 //=============================================================================
 500 // Function: IsOk
 501 // Purpose: returns TRUE if the volume is legal.
 502 // Notes: For fixed disks, it must exist.  For removable disks, it must also
 503 //        be present.  For Network Shares, it must also be logged in, etc.
 504 //=============================================================================
 505 bool wxFSVolumeBase::IsOk() const
 506 {
 507     return m_isOk;
 508 } // IsOk
 509
 510 //=============================================================================
 511 // Function: GetKind
 512 // Purpose: Return the type of the volume.
 513 //=============================================================================
 514 wxFSVolumeKind wxFSVolumeBase::GetKind() const
 515 {
 516     if (!m_isOk)
 517         return wxFS_VOL_OTHER;
 518
 519     FileInfoMap::iterator itr = s_fileInfo.find(m_volName);
 520     if (itr == s_fileInfo.end())
 521         return wxFS_VOL_OTHER;
 522
 523     return itr->second.m_type;
 524 }
 525
 526 //=============================================================================
 527 // Function: GetFlags
 528 // Purpose: Return the caches flags for this volume.
 529 // Notes: - Returns -1 if no flags were cached.
 530 //=============================================================================
 531 int wxFSVolumeBase::GetFlags() const
 532 {
 533     if (!m_isOk)
 534         return -1;
 535
 536     FileInfoMap::iterator itr = s_fileInfo.find(m_volName);
 537     if (itr == s_fileInfo.end())
 538         return -1;
 539
 540     return itr->second.m_flags;
 541 } // GetFlags
 542
 543 #endif // wxUSE_BASE
 544
 545 // ============================================================================
 546 // wxFSVolume
 547 // ============================================================================
 548
 549 #if wxUSE_GUI
 550
 551 void wxFSVolume::InitIcons()
 552 {
 553     m_icons.Alloc(wxFS_VOL_ICO_MAX);
 554     wxIcon null;
 555     for (int idx = 0; idx < wxFS_VOL_ICO_MAX; idx++)
 556         m_icons.Add(null);
 557 }
 558
 559 //=============================================================================
 560 // Function: GetIcon
 561 // Purpose: return the requested icon.
 562 //=============================================================================
 563
 564 wxIcon wxFSVolume::GetIcon(wxFSIconType type) const
 565 {
 566     wxCHECK_MSG( type >= 0 && (size_t)type < m_icons.GetCount(), wxNullIcon,
 567                  _T("wxFSIconType::GetIcon(): invalid icon index") );
 568
 569     // Load on demand.
 570     if (m_icons[type].IsNull())
 571     {
 572         UINT flags = SHGFI_ICON;
 573         switch (type)
 574         {
 575         case wxFS_VOL_ICO_SMALL:
 576             flags |= SHGFI_SMALLICON;
 577             break;
 578
 579         case wxFS_VOL_ICO_LARGE:
 580             flags |= SHGFI_SHELLICONSIZE;
 581             break;
 582
 583         case wxFS_VOL_ICO_SEL_SMALL:
 584             flags |= SHGFI_SMALLICON | SHGFI_OPENICON;
 585             break;
 586
 587         case wxFS_VOL_ICO_SEL_LARGE:
 588             flags |= SHGFI_SHELLICONSIZE | SHGFI_OPENICON;
 589             break;
 590
 591         case wxFS_VOL_ICO_MAX:
 592             wxFAIL_MSG(_T("wxFS_VOL_ICO_MAX is not valid icon type"));
 593             break;
 594         }
 595
 596         SHFILEINFO fi;
 597         long rc = SHGetFileInfo(m_volName, 0, &fi, sizeof(fi), flags);
 598         m_icons[type].SetHICON((WXHICON)fi.hIcon);
 599         if (!rc || !fi.hIcon)
 600             wxLogError(_("Cannot load icon from '%s'."), m_volName.c_str());
 601     }
 602
 603     return m_icons[type];
 604 } // GetIcon
 605
 606 #endif // wxUSE_GUI
 607
 608 #endif // wxUSE_FSVOLUME
 609