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