#include "resolve_path.h" #include //not necessarily included by ! #include #include #include #include #include #include //wxGetEnv #ifdef ZEN_WIN #include #include #include //includes "windows.h" #include #include #ifdef _MSC_VER #pragma comment(lib, "Mpr.lib") #endif #elif defined ZEN_LINUX || defined ZEN_MAC #include //getenv() #include //getcwd #endif using namespace zen; namespace { #ifdef ZEN_WIN Zstring resolveRelativePath(const Zstring& relativeName) //note: ::GetFullPathName() is documented not threadsafe! { //don't use long path prefix! does not work with relative paths "." and ".." const DWORD bufferSize = ::GetFullPathName(relativeName.c_str(), 0, nullptr, nullptr); if (bufferSize > 0) { std::vector buffer(bufferSize); const DWORD charsWritten = ::GetFullPathName(relativeName.c_str(), //__in LPCTSTR lpFileName, bufferSize, //__in DWORD nBufferLength, &buffer[0], //__out LPTSTR lpBuffer, nullptr); //__out LPTSTR *lpFilePart if (0 < charsWritten && charsWritten < bufferSize) //theoretically, charsWritten can never be == "bufferSize" return Zstring(&buffer[0], charsWritten); } return relativeName; //ERROR! Don't do anything } #elif defined ZEN_LINUX || defined ZEN_MAC Zstring resolveRelativePath(const Zstring& relativeName) { //http://linux.die.net/man/2/path_resolution if (!startsWith(relativeName, FILE_NAME_SEPARATOR)) //absolute names are exactly those starting with a '/' { /* basic support for '~': strictly speaking this is a shell-layer feature, so "realpath()" won't handle it http://www.gnu.org/software/bash/manual/html_node/Tilde-Expansion.html http://linux.die.net/man/3/getpwuid: An application that wants to determine its user's home directory should inspect the value of HOME (rather than the value getpwuid(getuid())->pw_dir) since this allows the user to modify their notion of "the home directory" during a login session. */ if (startsWith(relativeName, "~/") || relativeName == "~") { const char* homeDir = ::getenv("HOME"); if (!homeDir) return relativeName; //error! no further processing! if (startsWith(relativeName, "~/")) return appendSeparator(homeDir) + afterFirst(relativeName, '/'); else if (relativeName == "~") return homeDir; } //we cannot use ::realpath() since it resolves *existing* relative paths only! if (char* dirpath = ::getcwd(nullptr, 0)) { ZEN_ON_SCOPE_EXIT(::free(dirpath)); return appendSeparator(dirpath) + relativeName; } } return relativeName; } #endif #ifdef ZEN_WIN class CsidlConstants { public: typedef std::map CsidlToDirMap; //case-insensitive comparison static const CsidlToDirMap& get() { static CsidlConstants inst; //potential MT solved by intializing at startup, see below return inst.csidlToDir; } private: CsidlConstants() { auto addCsidl = [&](int csidl, const Zstring& paramName) { wchar_t buffer[MAX_PATH] = {}; if (SUCCEEDED(::SHGetFolderPath(nullptr, //__in HWND hwndOwner, csidl | CSIDL_FLAG_DONT_VERIFY, //__in int nFolder, nullptr, //__in HANDLE hToken, 0 /* == SHGFP_TYPE_CURRENT*/, //__in DWORD dwFlags, buffer))) //__out LPTSTR pszPath { Zstring dirname = buffer; if (!dirname.empty()) csidlToDir.insert(std::make_pair(paramName, dirname)); } }; //================================================================================================ //SHGetKnownFolderPath: API available only with Windows Vista and later: #ifdef __MINGW32__ #define KF_FLAG_DONT_VERIFY 0x00004000 #endif typedef HRESULT (STDAPICALLTYPE* SHGetKnownFolderPathFunc)(REFKNOWNFOLDERID rfid, DWORD dwFlags, HANDLE hToken, PWSTR* ppszPath); const SysDllFun shGetKnownFolderPath(L"Shell32.dll", "SHGetKnownFolderPath"); auto addFolderId = [&](REFKNOWNFOLDERID rfid, const Zstring& paramName) { if (shGetKnownFolderPath != nullptr) //[!] avoid bogus MSVC "performance warning" { PWSTR path = nullptr; if (SUCCEEDED(shGetKnownFolderPath(rfid, //_In_ REFKNOWNFOLDERID rfid, KF_FLAG_DONT_VERIFY, //_In_ DWORD dwFlags, nullptr, //_In_opt_ HANDLE hToken, &path))) //_Out_ PWSTR *ppszPath { ZEN_ON_SCOPE_EXIT(::CoTaskMemFree(path)); Zstring dirname = path; if (!dirname.empty()) csidlToDir.insert(std::make_pair(paramName, dirname)); } } }; addCsidl(CSIDL_DESKTOPDIRECTORY, L"csidl_Desktop"); // C:\Users\\Desktop addCsidl(CSIDL_COMMON_DESKTOPDIRECTORY, L"csidl_PublicDesktop"); // C:\Users\All Users\Desktop addCsidl(CSIDL_FAVORITES, L"csidl_Favorites"); // C:\Users\\Favorites addCsidl(CSIDL_COMMON_FAVORITES, L"csidl_PublicFavorites"); // C:\Users\\Favorites; unused? -> http://blogs.msdn.com/b/oldnewthing/archive/2012/09/04/10346022.aspx addCsidl(CSIDL_PERSONAL, L"csidl_MyDocuments"); // C:\Users\\Documents addCsidl(CSIDL_COMMON_DOCUMENTS, L"csidl_PublicDocuments"); // C:\Users\Public\Documents addCsidl(CSIDL_MYMUSIC, L"csidl_MyMusic"); // C:\Users\\Music addCsidl(CSIDL_COMMON_MUSIC, L"csidl_PublicMusic"); // C:\Users\Public\Music addCsidl(CSIDL_MYPICTURES, L"csidl_MyPictures"); // C:\Users\\Pictures addCsidl(CSIDL_COMMON_PICTURES, L"csidl_PublicPictures"); // C:\Users\Public\Pictures addCsidl(CSIDL_MYVIDEO, L"csidl_MyVideos"); // C:\Users\\Videos addCsidl(CSIDL_COMMON_VIDEO, L"csidl_PublicVideos"); // C:\Users\Public\Videos addCsidl(CSIDL_NETHOOD, L"csidl_Nethood"); // C:\Users\\AppData\Roaming\Microsoft\Windows\Network Shortcuts addCsidl(CSIDL_PROGRAMS, L"csidl_Programs"); // C:\Users\\AppData\Roaming\Microsoft\Windows\Start Menu\Programs addCsidl(CSIDL_COMMON_PROGRAMS, L"csidl_PublicPrograms"); // C:\ProgramData\Microsoft\Windows\Start Menu\Programs addCsidl(CSIDL_RESOURCES, L"csidl_Resources"); // C:\Windows\Resources addCsidl(CSIDL_STARTMENU, L"csidl_StartMenu"); // C:\Users\\AppData\Roaming\Microsoft\Windows\Start Menu addCsidl(CSIDL_COMMON_STARTMENU, L"csidl_PublicStartMenu"); // C:\ProgramData\Microsoft\Windows\Start Menu addCsidl(CSIDL_STARTUP, L"csidl_Startup"); // C:\Users\\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\StartUp addCsidl(CSIDL_COMMON_STARTUP, L"csidl_PublicStartup"); // C:\ProgramData\Microsoft\Windows\Start Menu\Programs\StartUp addCsidl(CSIDL_TEMPLATES, L"csidl_Templates"); // C:\Users\\AppData\Roaming\Microsoft\Windows\Templates addCsidl(CSIDL_COMMON_TEMPLATES, L"csidl_PublicTemplates"); // C:\ProgramData\Microsoft\Windows\Templates //Vista and later: addFolderId(FOLDERID_Downloads, L"csidl_Downloads"); // C:\Users\\Downloads addFolderId(FOLDERID_PublicDownloads, L"csidl_PublicDownloads"); // C:\Users\Public\Downloads addFolderId(FOLDERID_QuickLaunch, L"csidl_QuickLaunch"); // C:\Users\\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch /* CSIDL_APPDATA covered by %AppData% CSIDL_LOCAL_APPDATA covered by %LocalAppData% -> not on XP! CSIDL_COMMON_APPDATA covered by %ProgramData% -> not on XP! CSIDL_PROFILE covered by %UserProfile% CSIDL_WINDOWS covered by %WinDir% CSIDL_SYSTEM covered by %WinDir% CSIDL_SYSTEMX86 covered by %WinDir% CSIDL_PROGRAM_FILES covered by %ProgramFiles% CSIDL_PROGRAM_FILES_COMMON covered by %CommonProgramFiles% CSIDL_PROGRAM_FILESX86 covered by %ProgramFiles(x86)% -> not on XP! CSIDL_PROGRAM_FILES_COMMONX86 covered by %CommonProgramFiles(x86)% -> not on XP! CSIDL_ADMINTOOLS not relevant? CSIDL_COMMON_ADMINTOOLS not relevant? FOLDERID_Public covered by %Public% */ } CsidlConstants(const CsidlConstants&); CsidlConstants& operator=(const CsidlConstants&); CsidlToDirMap csidlToDir; }; //caveat: function scope static initialization is not thread-safe in VS 2010! => make sure to call at app start! struct Dummy { Dummy() { CsidlConstants::get(); }} blah; #endif std::unique_ptr getEnvironmentVar(const Zstring& envName) //return nullptr if not found { wxString value; if (!wxGetEnv(utfCvrtTo(envName), &value)) return nullptr; //some postprocessing: trim(value); //remove leading, trailing blanks //remove leading, trailing double-quotes if (startsWith(value, L"\"") && endsWith (value, L"\"") && value.length() >= 2) value = wxString(value.c_str() + 1, value.length() - 2); return make_unique(utfCvrtTo(value)); } std::unique_ptr resolveMacro(const Zstring& macro, //macro without %-characters const std::vector>& ext) //return nullptr if not resolved { auto equalNoCase = [](const Zstring& lhs, const Zstring& rhs) { return utfCvrtTo(lhs).CmpNoCase(utfCvrtTo(rhs)) == 0; }; //there exist environment variables named %TIME%, %DATE% so check for our internal macros first! if (equalNoCase(macro, Zstr("time"))) return make_unique(formatTime(Zstr("%H%M%S"))); if (equalNoCase(macro, Zstr("date"))) return make_unique(formatTime(FORMAT_ISO_DATE)); if (equalNoCase(macro, Zstr("timestamp"))) return make_unique(formatTime(Zstr("%Y-%m-%d %H%M%S"))); //e.g. "2012-05-15 131513" std::unique_ptr cand; auto processPhrase = [&](const Zchar* phrase, const Zchar* format) -> bool { if (!equalNoCase(macro, phrase)) return false; cand = make_unique(formatTime(format)); return true; }; if (processPhrase(Zstr("weekday"), Zstr("%A"))) return cand; if (processPhrase(Zstr("day" ), Zstr("%d"))) return cand; if (processPhrase(Zstr("month" ), Zstr("%m"))) return cand; if (processPhrase(Zstr("week" ), Zstr("%U"))) return cand; if (processPhrase(Zstr("year" ), Zstr("%Y"))) return cand; if (processPhrase(Zstr("hour" ), Zstr("%H"))) return cand; if (processPhrase(Zstr("min" ), Zstr("%M"))) return cand; if (processPhrase(Zstr("sec" ), Zstr("%S"))) return cand; //check domain-specific extensions { auto it = std::find_if(ext.begin(), ext.end(), [&](const std::pair& p) { return equalNoCase(macro, p.first); }); if (it != ext.end()) return make_unique(it->second); } //try to resolve as environment variable if (std::unique_ptr value = getEnvironmentVar(macro)) return value; #ifdef ZEN_WIN //try to resolve as CSIDL value { const auto& csidlMap = CsidlConstants::get(); auto it = csidlMap.find(macro); if (it != csidlMap.end()) return make_unique(it->second); } #endif return nullptr; } const Zchar MACRO_SEP = Zstr('%'); //returns expanded or original string Zstring expandMacros(const Zstring& text, const std::vector>& ext) { if (contains(text, MACRO_SEP)) { Zstring prefix = beforeFirst(text, MACRO_SEP); Zstring rest = afterFirst (text, MACRO_SEP); if (contains(rest, MACRO_SEP)) { Zstring potentialMacro = beforeFirst(rest, MACRO_SEP); Zstring postfix = afterFirst (rest, MACRO_SEP); //text == prefix + MACRO_SEP + potentialMacro + MACRO_SEP + postfix if (std::unique_ptr value = resolveMacro(potentialMacro, ext)) return prefix + *value + expandMacros(postfix, ext); else return prefix + MACRO_SEP + potentialMacro + expandMacros(MACRO_SEP + postfix, ext); } } return text; } } Zstring zen::expandMacros(const Zstring& text) { return ::expandMacros(text, std::vector>()); } namespace { #ifdef ZEN_WIN //networks and cdrom excluded - may still block for slow USB sticks! Zstring getPathByVolumenName(const Zstring& volumeName) //return empty string on error { //FindFirstVolume(): traverses volumes on local hard disks only! //GetLogicalDriveStrings(): traverses all *logical* volumes, including CD-ROM, FreeOTFE virtual volumes const DWORD bufferSize = ::GetLogicalDriveStrings(0, nullptr); std::vector buffer(bufferSize); const DWORD rv = ::GetLogicalDriveStrings(bufferSize, //__in DWORD nBufferLength, &buffer[0]); //__out LPTSTR lpBuffer if (0 < rv && rv < bufferSize) { //search for matching path in parallel until first hit RunUntilFirstHit findFirstMatch; for (const wchar_t* it = &buffer[0]; *it != 0; it += strLength(it) + 1) //list terminated by empty c-string { const Zstring path = it; findFirstMatch.addJob([path, volumeName]() -> std::unique_ptr { UINT type = ::GetDriveType(appendSeparator(path).c_str()); //non-blocking call! if (type == DRIVE_REMOTE || type == DRIVE_CDROM) return nullptr; //next call seriously blocks for non-existing network drives! std::vector volName(MAX_PATH + 1); //docu says so if (::GetVolumeInformation(appendSeparator(path).c_str(), //__in_opt LPCTSTR lpRootPathName, &volName[0], //__out LPTSTR lpVolumeNameBuffer, static_cast(volName.size()), //__in DWORD nVolumeNameSize, nullptr, //__out_opt LPDWORD lpVolumeSerialNumber, nullptr, //__out_opt LPDWORD lpMaximumComponentLength, nullptr, //__out_opt LPDWORD lpFileSystemFlags, nullptr, //__out LPTSTR lpFileSystemNameBuffer, 0)) //__in DWORD nFileSystemNameSize if (EqualFilename()(volumeName, Zstring(&volName[0]))) return zen::make_unique(path); return nullptr; }); } if (auto result = findFirstMatch.get()) //blocks until ready return *result; } return Zstring(); } //networks and cdrom excluded - this should not block Zstring getVolumeName(const Zstring& volumePath) //return empty string on error { UINT rv = ::GetDriveType(appendSeparator(volumePath).c_str()); //non-blocking call! if (rv != DRIVE_REMOTE && rv != DRIVE_CDROM) { const DWORD bufferSize = MAX_PATH + 1; std::vector buffer(bufferSize); if (::GetVolumeInformation(appendSeparator(volumePath).c_str(), //__in_opt LPCTSTR lpRootPathName, &buffer[0], //__out LPTSTR lpVolumeNameBuffer, bufferSize, //__in DWORD nVolumeNameSize, nullptr, //__out_opt LPDWORD lpVolumeSerialNumber, nullptr, //__out_opt LPDWORD lpMaximumComponentLength, nullptr, //__out_opt LPDWORD lpFileSystemFlags, nullptr, //__out LPTSTR lpFileSystemNameBuffer, 0)) //__in DWORD nFileSystemNameSize return &buffer[0]; } return Zstring(); } #endif //expand volume name if possible, return original input otherwise Zstring expandVolumeName(const Zstring& text) // [volname]:\folder [volname]\folder [volname]folder -> C:\folder { //this would be a nice job for a C++11 regex... //we only expect the [.*] pattern at the beginning => do not touch dir names like "C:\somedir\[stuff]" Zstring textTmp = text; trim(textTmp, true, false); if (startsWith(textTmp, Zstr("["))) { size_t posEnd = textTmp.find(Zstr("]")); if (posEnd != Zstring::npos) { Zstring volname = Zstring(textTmp.c_str() + 1, posEnd - 1); Zstring rest = Zstring(textTmp.c_str() + posEnd + 1); if (startsWith(rest, Zstr(':'))) rest = afterFirst(rest, Zstr(':')); if (startsWith(rest, FILE_NAME_SEPARATOR)) rest = afterFirst(rest, FILE_NAME_SEPARATOR); #ifdef ZEN_WIN //[.*] pattern was found... if (!volname.empty()) { Zstring volPath = getPathByVolumenName(volname); //may block for slow USB sticks! if (!volPath.empty()) return appendSeparator(volPath) + rest; //successfully replaced pattern } //error: did not find corresponding volume name: /*make sure directory creation will fail later if attempted, instead of inconveniently interpreting this string as a relative name! [FFS USB]\FreeFileSync will be resolved as ?:\[FFS USB]\FreeFileSync\ - Windows /.../[FFS USB]/FreeFileSync/ - Linux instead of: C:\Program Files\FreeFileSync\[FFS USB]\FreeFileSync\ */ return L"?:\\[" + volname + L"]\\" + rest; #elif defined ZEN_LINUX || defined ZEN_MAC //neither supported nor needed return "/.../[" + volname + "]/" + rest; #endif } } return text; } } void getDirectoryAliasesRecursive(const Zstring& dirname, std::set& output) { #ifdef ZEN_WIN //1. replace volume path by volume name: c:\dirname -> [SYSTEM]\dirname if (dirname.size() >= 3 && std::iswalpha(dirname[0]) && dirname[1] == L':' && dirname[2] == L'\\') { Zstring volname = getVolumeName(Zstring(dirname.c_str(), 3)); //should not block if (!volname.empty()) output.insert(L"[" + volname + L"]" + Zstring(dirname.c_str() + 2)); } //2. replace volume name by volume path: [SYSTEM]\dirname -> c:\dirname { Zstring testVolname = expandVolumeName(dirname); //should not block if (testVolname != dirname) if (output.insert(testVolname).second) getDirectoryAliasesRecursive(testVolname, output); //recurse! } #endif //3. environment variables: C:\Users\ -> %USERPROFILE% { std::map envToDir; //get list of useful variables auto addEnvVar = [&](const Zstring& envName) { if (std::unique_ptr value = getEnvironmentVar(envName)) envToDir.insert(std::make_pair(envName, *value)); }; #ifdef ZEN_WIN addEnvVar(L"AllUsersProfile"); // C:\ProgramData addEnvVar(L"AppData"); // C:\Users\\AppData\Roaming addEnvVar(L"LocalAppData"); // C:\Users\\AppData\Local addEnvVar(L"ProgramData"); // C:\ProgramData addEnvVar(L"ProgramFiles"); // C:\Program Files addEnvVar(L"ProgramFiles(x86)");// C:\Program Files (x86) addEnvVar(L"CommonProgramFiles"); // C:\Program Files\Common Files addEnvVar(L"CommonProgramFiles(x86)"); // C:\Program Files (x86)\Common Files addEnvVar(L"Public"); // C:\Users\Public addEnvVar(L"UserProfile"); // C:\Users\ addEnvVar(L"WinDir"); // C:\Windows addEnvVar(L"Temp"); // C:\Windows\Temp //add CSIDL values: http://msdn.microsoft.com/en-us/library/bb762494(v=vs.85).aspx const auto& csidlMap = CsidlConstants::get(); envToDir.insert(csidlMap.begin(), csidlMap.end()); #elif defined ZEN_LINUX || defined ZEN_MAC addEnvVar("HOME"); //Linux: /home/ Mac: /Users/ #endif //substitute paths by symbolic names auto pathStartsWith = [](const Zstring& path, const Zstring& prefix) -> bool { #if defined ZEN_WIN || defined ZEN_MAC Zstring tmp = path; Zstring tmp2 = prefix; ::makeUpper(tmp); ::makeUpper(tmp2); return startsWith(tmp, tmp2); #elif defined ZEN_LINUX return startsWith(path, prefix); #endif }; std::for_each(envToDir.begin(), envToDir.end(), [&](const std::pair& entry) { if (pathStartsWith(dirname, entry.second)) output.insert(MACRO_SEP + entry.first + MACRO_SEP + (dirname.c_str() + entry.second.size())); }); } //4. replace (all) macros: %USERPROFILE% -> C:\Users\ { Zstring testMacros = expandMacros(dirname); if (testMacros != dirname) if (output.insert(testMacros).second) getDirectoryAliasesRecursive(testMacros, output); //recurse! } } std::vector zen::getDirectoryAliases(const Zstring& dirString) { Zstring dirname = dirString; trim(dirname, true, false); if (dirname.empty()) return std::vector(); std::set tmp; getDirectoryAliasesRecursive(dirname, tmp); tmp.erase(dirname); tmp.erase(Zstring()); return std::vector(tmp.begin(), tmp.end()); } Zstring zen::getFormattedDirectoryName(const Zstring& dirString) // throw() { //formatting is needed since functions expect the directory to end with '\' to be able to split the relative names. Zstring dirname = dirString; //remove leading/trailing whitespace before allowing misinterpretation in applyLongPathPrefix() trim(dirname, true, false); while (endsWith(dirname, Zstr(' '))) //don't remove all whitespace from right, e.g. 0xa0 may be used as part of dir name dirname.resize(dirname.size() - 1); if (dirname.empty()) //an empty string would later be resolved as "\"; this is not desired return Zstring(); dirname = expandMacros(dirname); dirname = expandVolumeName(dirname); //may block for slow USB sticks! /* need to resolve relative paths: WINDOWS: - \\?\-prefix which needs absolute names - Volume Shadow Copy: volume name needs to be part of each filename - file icon buffer (at least for extensions that are actually read from disk, like "exe") - ::SHFileOperation(): Using relative path names is not thread safe WINDOWS/LINUX: - detection of dependent directories, e.g. "\" and "C:\test" */ dirname = resolveRelativePath(dirname); return appendSeparator(dirname); } #ifdef ZEN_WIN void zen::loginNetworkShare(const Zstring& dirnameOrig, bool allowUserInteraction) //throw() - user interaction: show OS password prompt { /* ATTENTION: it is not safe to retrieve UNC path via ::WNetGetConnection() for every type of network share: network type |::WNetGetConnection rv | lpRemoteName | existing UNC path -----------------------------|-------------------------|---------------------------------|---------------- inactive local network share | ERROR_CONNECTION_UNAVAIL| \\192.168.1.27\new2 | YES WebDrive | NO_ERROR | \\Webdrive-ZenJu\GNU | NO Box.net (WebDav) | NO_ERROR | \\www.box.net\DavWWWRoot\dav | YES NetDrive | ERROR_NOT_CONNECTED | | NO ____________________________________________________________________________________________________________ Windows Login Prompt Naming Conventions: user account: \ e.g. WIN-XP\ZenJu network share: \\\ e.g. \\WIN-XP\test Windows Command Line: - list *all* active network connections, including deviceless ones which are hidden in Explorer: net use - delete active connection: net use /delete \\server\share ____________________________________________________________________________________________________________ Scenario: XP-shared folder is accessed by Win 7 over LAN with access limited to a certain user Problems: I. WNetAddConnection2() allows (at least certain) invalid credentials (e.g. username: a/password: a) and establishes an *unusable* connection II. WNetAddConnection2() refuses to overwrite an existing (unusable) connection created in I), but shows prompt repeatedly III. WNetAddConnection2() won't bring up the prompt if *wrong* credentials had been entered just recently, even with CONNECT_INTERACTIVE specified! => 2-step proccess */ auto connect = [&](NETRESOURCE& trgRes) //blocks heavily if network is not reachable!!! { //1. first try to connect without user interaction - blocks! DWORD rv = ::WNetAddConnection2(&trgRes, // __in LPNETRESOURCE lpNetResource, nullptr, // __in LPCTSTR lpPassword, nullptr, // __in LPCTSTR lpUsername, 0); //__in DWORD dwFlags //53L ERROR_BAD_NETPATH The network path was not found. //86L ERROR_INVALID_PASSWORD //1219L ERROR_SESSION_CREDENTIAL_CONFLICT Multiple connections to a server or shared resource by the same user, using more than one user name, are not allowed. Disconnect all previous connections to the server or shared resource and try again. //1326L ERROR_LOGON_FAILURE Logon failure: unknown user name or bad password. //1236L ERROR_CONNECTION_ABORTED if (somethingExists(trgRes.lpRemoteName)) //blocks! return; //success: connection usable! -> don't care about "rv" if (rv == ERROR_BAD_NETPATH || //Windows 7 rv == ERROR_BAD_NET_NAME|| //XP rv == ERROR_CONNECTION_ABORTED) //failed to connect to a network that existed not too long ago; will later return ERROR_BAD_NETPATH return; //no need to show a prompt for an unreachable network device //2. if first attempt failed, we need to *force* prompt by using CONNECT_PROMPT if (allowUserInteraction) { //avoid problem II.) DWORD rv2= ::WNetCancelConnection2(trgRes.lpRemoteName, //_In_ LPCTSTR lpName, 0, //_In_ DWORD dwFlags, true); //_In_ BOOL fForce //2250L ERROR_NOT_CONNECTED //enforce login prompt DWORD rv3 = ::WNetAddConnection2(&trgRes, // __in LPNETRESOURCE lpNetResource, nullptr, // __in LPCTSTR lpPassword, nullptr, // __in LPCTSTR lpUsername, CONNECT_INTERACTIVE | CONNECT_PROMPT); //__in DWORD dwFlags (void)rv2; (void)rv3; } }; Zstring dirname = removeLongPathPrefix(dirnameOrig); trim(dirname, true, false); //1. locally mapped network share if (dirname.size() >= 2 && iswalpha(dirname[0]) && dirname[1] == L':') { Zstring driveLetter(dirname.c_str(), 2); //e.g.: "Q:" { DWORD bufferSize = 10000; std::vector remoteNameBuffer(bufferSize); //map local -> remote //note: following function call does NOT block! DWORD rv = ::WNetGetConnection(driveLetter.c_str(), //__in LPCTSTR lpLocalName in the form ":" &remoteNameBuffer[0], //__out LPTSTR lpRemoteName, &bufferSize); //__inout LPDWORD lpnLength if (rv == ERROR_CONNECTION_UNAVAIL) //remoteNameBuffer will be filled nevertheless! { //ERROR_CONNECTION_UNAVAIL: network mapping is existing, but not connected Zstring networkShare = &remoteNameBuffer[0]; if (!networkShare.empty()) { NETRESOURCE trgRes = {}; trgRes.dwType = RESOURCETYPE_DISK; trgRes.lpLocalName = const_cast(driveLetter.c_str()); //lpNetResource is marked "__in", seems WNetAddConnection2 is not const correct! trgRes.lpRemoteName = const_cast(networkShare.c_str()); // connect(trgRes); //blocks! } } } } //2. deviceless network connection else if (startsWith(dirname, L"\\\\")) //UNC path { const Zstring networkShare = [&]() -> Zstring //extract prefix "\\server\share" { size_t pos = dirname.find('\\', 2); if (pos == Zstring::npos) return Zstring(); pos = dirname.find('\\', pos + 1); return pos == Zstring::npos ? dirname : Zstring(dirname.c_str(), pos); }(); if (!networkShare.empty()) { //::WNetGetResourceInformation seems to fail with ERROR_BAD_NET_NAME even for existing unconnected network shares! // => unconditionally try to connect to network share, seems we cannot reliably detect connection status otherwise NETRESOURCE trgRes = {}; trgRes.dwType = RESOURCETYPE_DISK; trgRes.lpRemoteName = const_cast(networkShare.c_str()); //trgRes is "__in" connect(trgRes); //blocks! } } } #endif