I am experiencing a strange issue with the Restart Manager API: RmGetlist(). To simulate a file locking scenario, i am making use of the following 3rd party file locking utilities:
Ez file locker -http://www.xoslab.com/efl.html -
File locker http://www.jensscheffler.de/filelocker
The strange issue here is that, both these utilities lock a certain file, however, RMGetList() fails with an Access denied error(5) with the first file locking utility(Ez File lock) whereas it works with the second file locking utility.
What could possibly be wrong here? Why would RmGetList() fail with one file locking utility but work with another?
Below is the code that is being used:
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Security;
using System.IO;
using System.Windows.Forms;
namespace RMSession
{
class Program
{
public static void GetProcessesUsingFiles(string[] filePaths)
{
uint sessionHandle;
int error = NativeMethods.RmStartSession(out sessionHandle, 0, Guid.NewGuid().ToString("N"));
if (error == 0)
{
try
{
error = NativeMethods.RmRegisterResources(sessionHandle, (uint)filePaths.Length, filePaths, 0, null, 0, null);
if (error == 0)
{
RM_PROCESS_INFO[] processInfo = null;
uint pnProcInfoNeeded = 0, pnProcInfo = 0, lpdwRebootReasons = RmRebootReasonNone;
error = NativeMethods.RmGetList(sessionHandle, out pnProcInfoNeeded, ref pnProcInfo, null, ref lpdwRebootReasons);
while (error == ERROR_MORE_DATA)
{
processInfo = new RM_PROCESS_INFO[pnProcInfoNeeded];
pnProcInfo = (uint)processInfo.Length;
error = NativeMethods.RmGetList(sessionHandle, out pnProcInfoNeeded, ref pnProcInfo, processInfo, ref lpdwRebootReasons);
}
if (error == 0 && processInfo != null)
{
for (var i = 0; i < pnProcInfo; i++)
{
RM_PROCESS_INFO procInfo = processInfo[i];
Process proc = null;
try
{
proc = Process.GetProcessById(procInfo.Process.dwProcessId);
}
catch (ArgumentException)
{
// Eat exceptions for processes which are no longer running.
}
if (proc != null)
{
//yield return proc;
}
}
}
}
}
finally
{
NativeMethods.RmEndSession(sessionHandle);
}
}
}
private const int RmRebootReasonNone = 0;
private const int CCH_RM_MAX_APP_NAME = 255;
private const int CCH_RM_MAX_SVC_NAME = 63;
private const int ERROR_MORE_DATA = 234;
[StructLayout(LayoutKind.Sequential)]
private struct RM_UNIQUE_PROCESS
{
public int dwProcessId;
public System.Runtime.InteropServices.ComTypes.FILETIME ProcessStartTime;
}
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
private 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;
}
private enum RM_APP_TYPE
{
RmUnknownApp = 0,
RmMainWindow = 1,
RmOtherWindow = 2,
RmService = 3,
RmExplorer = 4,
RmConsole = 5,
RmCritical = 1000
}
[SuppressUnmanagedCodeSecurity]
private static class NativeMethods
{
/// <summary>
/// Starts a new Restart Manager session.
/// </summary>
/// <param name="pSessionHandle">A pointer to the handle of a Restart Manager session. The session handle can be passed in subsequent calls to the Restart Manager API.</param>
/// <param name="dwSessionFlags">Reserved must be 0.</param>
/// <param name="strSessionKey">A null-terminated string that contains the session key to the new session. A GUID will work nicely.</param>
/// <returns>Error code. 0 is successful.</returns>
[DllImport("RSTRTMGR.DLL", CharSet = CharSet.Unicode, PreserveSig = true, SetLastError = true, ExactSpelling = true)]
public static extern int RmStartSession(out uint pSessionHandle, int dwSessionFlags, string strSessionKey);
/// <summary>
/// Ends the Restart Manager session.
/// </summary>
/// <param name="pSessionHandle">A handle to an existing Restart Manager session.</param>
/// <returns>Error code. 0 is successful.</returns>
[DllImport("RSTRTMGR.DLL")]
public static extern int RmEndSession(uint pSessionHandle);
/// <summary>
/// Registers resources to a Restart Manager session.
/// </summary>
/// <param name="pSessionHandle">A handle to an existing Restart Manager session.</param>
/// <param name="nFiles">The number of files being registered.</param>
/// <param name="rgsFilenames">An array of strings of full filename paths.</param>
/// <param name="nApplications">The number of processes being registered.</param>
/// <param name="rgApplications">An array of RM_UNIQUE_PROCESS structures. </param>
/// <param name="nServices">The number of services to be registered.</param>
/// <param name="rgsServiceNames">An array of null-terminated strings of service short names.</param>
/// <returns>Error code. 0 is successful.</returns>
[DllImport("RSTRTMGR.DLL", CharSet = CharSet.Unicode)]
public static extern int RmRegisterResources(uint pSessionHandle, uint nFiles, string[] rgsFilenames, uint nApplications, [In] RM_UNIQUE_PROCESS[] rgApplications, uint nServices, string[] rgsServiceNames);
/// <summary>
/// Gets a list of all applications and services that are currently using resources that have been registered with the Restart Manager session.
/// </summary>
/// <param name="dwSessionHandle">A handle to an existing Restart Manager session.</param>
/// <param name="pnProcInfoNeeded">A pointer to an array size necessary to receive RM_PROCESS_INFO structures</param>
/// <param name="pnProcInfo">A pointer to the total number of RM_PROCESS_INFO structures in an array and number of structures filled.</param>
/// <param name="rgAffectedApps">An array of RM_PROCESS_INFO structures that list the applications and services using resources that have been registered with the session.</param>
/// <param name="lpdwRebootReasons">Pointer to location that receives a value of the RM_REBOOT_REASON enumeration that describes the reason a system restart is needed.</param>
/// <returns>Error code. 0 is successful.</returns>
[DllImport("RSTRTMGR.DLL")]
public static extern int RmGetList(uint dwSessionHandle, out uint pnProcInfoNeeded, ref uint pnProcInfo, [In, Out] RM_PROCESS_INFO[] rgAffectedApps, ref uint lpdwRebootReasons);
}
static void Main(string[] args)
{
Console.WriteLine("Starting...");
string[] file1 = new string[1];
MessageBox.Show("Debug C#");
file1[0] = @"C:\ProcessMonitor.zip";
//DirectoryInfo dirInfo = new DirectoryInfo(folder);
GetProcessesUsingFiles(file1);
Console.WriteLine("End");``
}
}
}