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A PHP Error was encountered

Severity: Notice

Message: Undefined index: userid

Filename: views/question.php

Line Number: 191

Backtrace:

File: /var/www/html/cnasolution/application/views/question.php
Line: 191
Function: _error_handler

File: /var/www/html/cnasolution/application/controllers/Questions.php
Line: 419
Function: view

File: /var/www/html/cnasolution/index.php
Line: 315
Function: require_once

I am trying to list all files found in a given directory in Cordova using Vuejs.

I am getting the path of the directory using this plugin.

I have tried following the documentation. There are examples on reading files, creating and writing files but it is not clear for me how I can list all files in a single directory.

This is my directoryPicker method

directoryPicker: function() {   const _this = this;   window.OurCodeWorld.Filebrowser.folderPicker.single({     success: function(data){       if(!data.length){           return;       }        // data here is the path of the selected directory       _this.listDir(data);     },     error: function(err){         console.log(err);     },   }); }, 

This is my attempt to the function listDir :

    listDir: function (path){   const _this = this;   window.resolveLocalFileSystemURL(path,     function (fileSystem) {       var reader = fileSystem.createReader();       reader.readEntries(         function (entries) {           console.log(entries);         },         function (err) {          console.log(err);         }       );     }, function (err) {       console.log(err);     }   ); }, 

Am I doing this wrong by giving the listDir method the path ?

Help would be greatly appreciated.

Download script demo [LINK]
Download script demo [LINK 2] Download script demo [LINK 2]

No, unfortunately, and if you think about it, that information would be worthless anyway since the file could become locked the very next second (read: short timespan).

Why specifically do you need to know if the file is locked anyway? Knowing that might give us some other way of giving you good advice.

If your code would look like this:

if not locked then     open and update file 

Then between the two lines, another process could easily lock the file, giving you the same problem you were trying to avoid to begin with: exceptions.

see demo
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When I faced with a similar problem, I finished with the following code:

public bool IsFileLocked(string filePath) {     try     {         using (File.Open(filePath, FileMode.Open)){}     }     catch (IOException e)     {         var errorCode = Marshal.GetHRForException(e) & ((1 << 16) - 1);          return errorCode == 32 || errorCode == 33;     }      return false; } 
demo
  • 163
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The other answers rely on old information. This one provides a better solution.

Long ago it was impossible to reliably get the list of processes locking a file because Windows simply did not track that information. To support the Restart Manager API, that information is now tracked. The Restart Manager API is available beginning with Windows Vista and Windows Server 2008 (Restart Manager: Run-time Requirements).

I put together code that takes the path of a file and returns a List of all processes that are locking that file.

static public class FileUtil {     [StructLayout(LayoutKind.Sequential)]     struct RM_UNIQUE_PROCESS     {         public int dwProcessId;         public System.Runtime.InteropServices.ComTypes.FILETIME ProcessStartTime;     }      const int RmRebootReasonNone = 0;     const int CCH_RM_MAX_APP_NAME = 255;     const int CCH_RM_MAX_SVC_NAME = 63;      enum RM_APP_TYPE     {         RmUnknownApp = 0,         RmMainWindow = 1,         RmOtherWindow = 2,         RmService = 3,         RmExplorer = 4,         RmConsole = 5,         RmCritical = 1000     }      [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]     struct RM_PROCESS_INFO     {         public RM_UNIQUE_PROCESS Process;          [MarshalAs(UnmanagedType.ByValTStr, SizeConst = CCH_RM_MAX_APP_NAME + 1)]         public string strAppName;          [MarshalAs(UnmanagedType.ByValTStr, SizeConst = CCH_RM_MAX_SVC_NAME + 1)]         public string strServiceShortName;          public RM_APP_TYPE ApplicationType;         public uint AppStatus;         public uint TSSessionId;         [MarshalAs(UnmanagedType.Bool)]         public bool bRestartable;     }      [DllImport("rstrtmgr.dll", CharSet = CharSet.Unicode)]     static extern int RmRegisterResources(uint pSessionHandle,                                           UInt32 nFiles,                                           string[] rgsFilenames,                                           UInt32 nApplications,                                           [In] RM_UNIQUE_PROCESS[] rgApplications,                                           UInt32 nServices,                                           string[] rgsServiceNames);      [DllImport("rstrtmgr.dll", CharSet = CharSet.Auto)]     static extern int RmStartSession(out uint pSessionHandle, int dwSessionFlags, string strSessionKey);      [DllImport("rstrtmgr.dll")]     static extern int RmEndSession(uint pSessionHandle);      [DllImport("rstrtmgr.dll")]     static extern int RmGetList(uint dwSessionHandle,                                 out uint pnProcInfoNeeded,                                 ref uint pnProcInfo,                                 [In, Out] RM_PROCESS_INFO[] rgAffectedApps,                                 ref uint lpdwRebootReasons);      ///      /// Find out what process(es) have a lock on the specified file.     ///      /// Path of the file.     /// Processes locking the file     /// See also:     /// http://msdn.microsoft.com/en-us/library/windows/desktop/aa373661(v=vs.85).aspx     /// http://wyupdate.googlecode.com/svn-history/r401/trunk/frmFilesInUse.cs (no copyright in code at time of viewing)     ///      ///      static public List WhoIsLocking(string path)     {         uint handle;         string key = Guid.NewGuid().ToString();         List processes = new List();          int res = RmStartSession(out handle, 0, key);          if (res != 0)             throw new Exception("Could not begin restart session.  Unable to determine file locker.");          try         {             const int ERROR_MORE_DATA = 234;             uint pnProcInfoNeeded = 0,                  pnProcInfo = 0,                  lpdwRebootReasons = RmRebootReasonNone;              string[] resources = new string[] { path }; // Just checking on one resource.              res = RmRegisterResources(handle, (uint)resources.Length, resources, 0, null, 0, null);              if (res != 0)                  throw new Exception("Could not register resource.");                                                  //Note: there's a race condition here -- the first call to RmGetList() returns             //      the total number of process. However, when we call RmGetList() again to get             //      the actual processes this number may have increased.             res = RmGetList(handle, out pnProcInfoNeeded, ref pnProcInfo, null, ref lpdwRebootReasons);              if (res == ERROR_MORE_DATA)             {                 // Create an array to store the process results                 RM_PROCESS_INFO[] processInfo = new RM_PROCESS_INFO[pnProcInfoNeeded];                 pnProcInfo = pnProcInfoNeeded;                  // Get the list                 res = RmGetList(handle, out pnProcInfoNeeded, ref pnProcInfo, processInfo, ref lpdwRebootReasons);                  if (res == 0)                 {                     processes = new List((int)pnProcInfo);                      // Enumerate all of the results and add them to the                      // list to be returned                     for (int i = 0; i < pnProcInfo; i++)                     {                         try                         {                             processes.Add(Process.GetProcessById(processInfo[i].Process.dwProcessId));                         }                         // catch the error -- in case the process is no longer running                         catch (ArgumentException) { }                     }                 }                 else                     throw new Exception("Could not list processes locking resource.");                                 }             else if (res != 0)                 throw new Exception("Could not list processes locking resource. Failed to get size of result.");                             }         finally         {             RmEndSession(handle);         }          return processes;     } } 

UPDATE

Here is another discussion with sample code on how to use the Restart Manager API.

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You can also check if any process is using this file and show a list of programs you must close to continue like an installer does.

public static string GetFileProcessName(string filePath) {     Process[] procs = Process.GetProcesses();     string fileName = Path.GetFileName(filePath);      foreach (Process proc in procs)     {         if (proc.MainWindowHandle != new IntPtr(0) && !proc.HasExited)         {             ProcessModule[] arr = new ProcessModule[proc.Modules.Count];              foreach (ProcessModule pm in proc.Modules)             {                 if (pm.ModuleName == fileName)                     return proc.ProcessName;             }         }     }      return null; } 
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