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;
 155     rc = SHGetFileInfo(filename, 0, &fi, sizeof(fi), SHGFI_ATTRIBUTES );
 156     if (!rc)
 157     {
 158         wxLogError(_("Cannot read typename from '%s'!"), filename);
 159     }
 160     else
 161     {
 162         if (fi.dwAttributes & SFGAO_READONLY)
 163             flags |= wxFS_VOL_READONLY;
 164         if (fi.dwAttributes & SFGAO_REMOVABLE)
 165             flags |= wxFS_VOL_REMOVABLE;
 166     }
 167
 168     //------------------
 169     // Flags are cached.
 170     //------------------
 171     s_fileInfo[filename] = FileInfo(flags, type);
 172
 173     return flags;
 174 } // GetBasicFlags
 175
 176 //=============================================================================
 177 // Function: FilteredAdd
 178 // Purpose: Add a file to the list if it meets the filter requirement.
 179 // Notes: - See GetBasicFlags for remarks about the Mounted flag.
 180 //=============================================================================
 181 static bool FilteredAdd(wxArrayString& list, const wxChar* filename,
 182                         unsigned flagsSet, unsigned flagsUnset)
 183 {
 184     bool accept = true;
 185     unsigned flags = GetBasicFlags(filename);
 186
 187     if (flagsSet & wxFS_VOL_MOUNTED && !(flags & wxFS_VOL_MOUNTED))
 188         accept = false;
 189     else if (flagsUnset & wxFS_VOL_MOUNTED && (flags & wxFS_VOL_MOUNTED))
 190         accept = false;
 191     else if (flagsSet & wxFS_VOL_REMOVABLE && !(flags & wxFS_VOL_REMOVABLE))
 192         accept = false;
 193     else if (flagsUnset & wxFS_VOL_REMOVABLE && (flags & wxFS_VOL_REMOVABLE))
 194         accept = false;
 195     else if (flagsSet & wxFS_VOL_READONLY && !(flags & wxFS_VOL_READONLY))
 196         accept = false;
 197     else if (flagsUnset & wxFS_VOL_READONLY && (flags & wxFS_VOL_READONLY))
 198         accept = false;
 199     else if (flagsSet & wxFS_VOL_REMOTE && !(flags & wxFS_VOL_REMOTE))
 200         accept = false;
 201     else if (flagsUnset & wxFS_VOL_REMOTE && (flags & wxFS_VOL_REMOTE))
 202         accept = false;
 203
 204     // Add to the list if passed the filter.
 205     if (accept)
 206         list.Add(filename);
 207
 208     return accept;
 209 } // FilteredAdd
 210
 211 //=============================================================================
 212 // Function: BuildListFromNN
 213 // Purpose: Append or remove items from the list
 214 // Notes: - There is no way to find all disconnected NN items, or even to find
 215 //          all items while determining which are connected and not.  So this
 216 //          function will find either all items or connected items.
 217 //=============================================================================
 218 static void BuildListFromNN(wxArrayString& list, NETRESOURCE* pResSrc,
 219                             unsigned flagsSet, unsigned flagsUnset)
 220 {
 221     HANDLE hEnum;
 222     int rc;
 223
 224     //-----------------------------------------------
 225     // Scope may be all drives or all mounted drives.
 226     //-----------------------------------------------
 227     unsigned scope = RESOURCE_GLOBALNET;
 228     if (flagsSet & wxFS_VOL_MOUNTED)
 229         scope = RESOURCE_CONNECTED;
 230
 231     //----------------------------------------------------------------------
 232     // Enumerate all items, adding only non-containers (ie. network shares).
 233     // Containers cause a recursive call to this function for their own
 234     // enumeration.
 235     //----------------------------------------------------------------------
 236     if (rc = s_pWNetOpenEnum(scope, RESOURCETYPE_DISK, 0, pResSrc, &hEnum), rc == NO_ERROR)
 237     {
 238         DWORD count = 1;
 239         DWORD size = 256;
 240         NETRESOURCE* pRes = (NETRESOURCE*)malloc(size);
 241         memset(pRes, 0, sizeof(NETRESOURCE));
 242         while (rc = s_pWNetEnumResource(hEnum, &count, pRes, &size), rc == NO_ERROR || rc == ERROR_MORE_DATA)
 243         {
 244             if (s_cancelSearch)
 245                 break;
 246
 247             if (rc == ERROR_MORE_DATA)
 248             {
 249                 pRes = (NETRESOURCE*)realloc(pRes, size);
 250                 count = 1;
 251             }
 252             else if (count == 1)
 253             {
 254                 // Enumerate the container.
 255                 if (pRes->dwUsage & RESOURCEUSAGE_CONTAINER)
 256                 {
 257                     BuildListFromNN(list, pRes, flagsSet, flagsUnset);
 258                 }
 259
 260                 // Add the network share.
 261                 else
 262                 {
 263                     wxString filename(pRes->lpRemoteName);
 264
 265                     if (!filename.empty())
 266                     {
 267                         if (filename.Last() != '\\')
 268                             filename.Append('\\');
 269
 270                         // The filter function will not know mounted from unmounted, and neither do we unless
 271                         // we are iterating using RESOURCE_CONNECTED, in which case they all are mounted.
 272                         // Volumes on disconnected servers, however, will correctly show as unmounted.
 273                         FilteredAdd(list, filename, flagsSet, flagsUnset&~wxFS_VOL_MOUNTED);
 274                         if (scope == RESOURCE_GLOBALNET)
 275                             s_fileInfo[filename].m_flags &= ~wxFS_VOL_MOUNTED;
 276                     }
 277                 }
 278             }
 279             else if (count == 0)
 280                 break;
 281         }
 282         free(pRes);
 283         s_pWNetCloseEnum(hEnum);
 284     }
 285 } // BuildListFromNN
 286
 287 //=============================================================================
 288 // Function: CompareFcn
 289 // Purpose: Used to sort the NN list alphabetically, case insensitive.
 290 //=============================================================================
 291 static int CompareFcn(const wxString& first, const wxString& second)
 292 {
 293     return wxStricmp(first.c_str(), second.c_str());
 294 } // CompareFcn
 295
 296 //=============================================================================
 297 // Function: BuildRemoteList
 298 // Purpose: Append Network Neighborhood items to the list.
 299 // Notes: - Mounted gets transalated into Connected.  FilteredAdd is told
 300 //          to ignore the Mounted flag since we need to handle it in a weird
 301 //          way manually.
 302 //        - The resulting list is sorted alphabetically.
 303 //=============================================================================
 304 static bool BuildRemoteList(wxArrayString& list, NETRESOURCE* pResSrc,
 305                             unsigned flagsSet, unsigned flagsUnset)
 306 {
 307     // NN query depends on dynamically loaded library.
 308     if (!s_pWNetOpenEnum || !s_pWNetEnumResource || !s_pWNetCloseEnum)
 309     {
 310         wxLogError(_("Failed to load mpr.dll."));
 311         return false;
 312     }
 313
 314     // Don't waste time doing the work if the flags conflict.
 315     if (flagsSet & wxFS_VOL_MOUNTED && flagsUnset & wxFS_VOL_MOUNTED)
 316         return false;
 317
 318     //----------------------------------------------
 319     // Generate the list according to the flags set.
 320     //----------------------------------------------
 321     BuildListFromNN(list, pResSrc, flagsSet, flagsUnset);
 322     list.Sort(CompareFcn);
 323
 324     //-------------------------------------------------------------------------
 325     // If mounted only is requested, then we only need one simple pass.
 326     // Otherwise, we need to build a list of all NN volumes and then apply the
 327     // list of mounted drives to it.
 328     //-------------------------------------------------------------------------
 329     if (!(flagsSet & wxFS_VOL_MOUNTED))
 330     {
 331         // generate.
 332         wxArrayString mounted;
 333         BuildListFromNN(mounted, pResSrc, flagsSet | wxFS_VOL_MOUNTED, flagsUnset & ~wxFS_VOL_MOUNTED);
 334         mounted.Sort(CompareFcn);
 335
 336         // apply list from bottom to top to preserve indexes if removing items.
 337         ssize_t iList = list.GetCount()-1;
 338         for (ssize_t iMounted = mounted.GetCount()-1; iMounted >= 0 && iList >= 0; iMounted--)
 339         {
 340             int compare;
 341             wxString all(list[iList]);
 342             wxString mount(mounted[iMounted]);
 343
 344             while (compare =
 345                      wxStricmp(list[iList].c_str(), mounted[iMounted].c_str()),
 346                    compare > 0 && iList >= 0)
 347             {
 348                 iList--;
 349                 all = list[iList];
 350             }
 351
 352
 353             if (compare == 0)
 354             {
 355                 // Found the element.  Remove it or mark it mounted.
 356                 if (flagsUnset & wxFS_VOL_MOUNTED)
 357                     list.RemoveAt(iList);
 358                 else
 359                     s_fileInfo[list[iList]].m_flags |= wxFS_VOL_MOUNTED;
 360
 361             }
 362
 363             iList--;
 364         }
 365     }
 366
 367     return true;
 368 } // BuildRemoteList
 369
 370 //+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 371 // wxFSVolume
 372 //+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 373
 374 //=============================================================================
 375 // Function: GetVolumes
 376 // Purpose: Generate and return a list of all volumes (drives) available.
 377 // Notes:
 378 //=============================================================================
 379 wxArrayString wxFSVolumeBase::GetVolumes(int flagsSet, int flagsUnset)
 380 {
 381     ::InterlockedExchange(&s_cancelSearch, FALSE);     // reset
 382
 383 #if wxUSE_DYNLIB_CLASS
 384     if (!s_mprLib.IsLoaded() && s_mprLib.Load(_T("mpr.dll")))
 385     {
 386 #ifdef UNICODE
 387         s_pWNetOpenEnum = (WNetOpenEnumPtr)s_mprLib.GetSymbol(_T("WNetOpenEnumW"));
 388         s_pWNetEnumResource = (WNetEnumResourcePtr)s_mprLib.GetSymbol(_T("WNetEnumResourceW"));
 389 #else
 390         s_pWNetOpenEnum = (WNetOpenEnumPtr)s_mprLib.GetSymbol(_T("WNetOpenEnumA"));
 391         s_pWNetEnumResource = (WNetEnumResourcePtr)s_mprLib.GetSymbol(_T("WNetEnumResourceA"));
 392 #endif
 393         s_pWNetCloseEnum = (WNetCloseEnumPtr)s_mprLib.GetSymbol(_T("WNetCloseEnum"));
 394     }
 395 #endif
 396
 397     wxArrayString list;
 398
 399     //-------------------------------
 400     // Local and mapped drives first.
 401     //-------------------------------
 402     // Allocate the required space for the API call.
 403     const DWORD chars = GetLogicalDriveStrings(0, NULL);
 404     TCHAR* buf = new TCHAR[chars+1];
 405
 406     // Get the list of drives.
 407     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