Hi,recently i've encountered with similar problem.
Take a closer look at that piece of code =) I think it would be useful for U.
It was tested on Windows 7 and Vista kernels. On Win 8 didn't run.
using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Diagnostics;
using System.Text;
using System.Threading;
namespace Common.FileLockInfo
{
public class ProcessHelper
{
public static List<Process> GetProcessesLockingFile(string filePath)
{
var procs = new List<process>();
foreach (var process in Process.GetProcesses())
{
var files = GetFilesLockedByProcess(process);
if (files.Contains(filePath)) procs.Add(process);
}
return procs;
}
public static List<string> GetProcessLockingFiles(int processID)
{
List<string> files = null;
Process p = Process.GetProcessById(processID);
if (p != null)
{
files = GetFilesLockedByProcess(p);
}
return files;
}
public static List<string> GetFilesLockedByProcess(Process process)
{
var outp = new List<string>();
ThreadStart ts = delegate
{
try
{
outp = UnsafeGetFilesLockedByProcess(process);
}
catch
{
}
};
try
{
var t = new Thread(ts);
t.Start();
if (!t.Join(250))
{
try
{
t.Abort();
}
catch { }
}
}
catch
{
}
return outp;
}
#region Inner Workings
private static List<string> UnsafeGetFilesLockedByProcess(Process process)
{
try
{
var handles = GetHandlesFromProcess(process);
List<string> files = new List<string>();
foreach (var handle in handles)
{
var file = GetFilePath(handle, process);
if (file != null) files.Add(file);
}
return files;
}
catch
{
return new List<string>();
}
}
const int CNST_SYSTEM_HANDLE_INFORMATION = 16;
const uint STATUS_INFO_LENGTH_MISMATCH = 0xc0000004;
private static string GetFilePath(NativeWin32Api.SYSTEM_HANDLE_INFORMATION sYSTEM_HANDLE_INFORMATION, Process process)
{
IntPtr m_ipProcessHwnd = NativeWin32Api.OpenProcess(NativeWin32Api.ProcessAccessFlags.All, false, process.Id);
IntPtr ipHandle = IntPtr.Zero;
var objBasic = new NativeWin32Api.OBJECT_BASIC_INFORMATION();
IntPtr ipBasic = IntPtr.Zero;
var objObjectType = new NativeWin32Api.OBJECT_TYPE_INFORMATION();
IntPtr ipObjectType = IntPtr.Zero;
var objObjectName = new NativeWin32Api.OBJECT_NAME_INFORMATION();
IntPtr ipObjectName = IntPtr.Zero;
string strObjectTypeName = "";
string strObjectName = "";
int nLength = 0;
int nReturn = 0;
IntPtr ipTemp = IntPtr.Zero;
if (!NativeWin32Api.DuplicateHandle(m_ipProcessHwnd, sYSTEM_HANDLE_INFORMATION.Handle, NativeWin32Api.GetCurrentProcess(), out ipHandle, 0, false, NativeWin32Api.DUPLICATE_SAME_ACCESS))
return null;
ipBasic = Marshal.AllocHGlobal(Marshal.SizeOf(objBasic));
NativeWin32Api.NtQueryObject(ipHandle, (int)NativeWin32Api.ObjectInformationClass.ObjectBasicInformation, ipBasic, Marshal.SizeOf(objBasic), ref nLength);
objBasic = (NativeWin32Api.OBJECT_BASIC_INFORMATION)Marshal.PtrToStructure(ipBasic, objBasic.GetType());
Marshal.FreeHGlobal(ipBasic);
ipObjectType = Marshal.AllocHGlobal(objBasic.TypeInformationLength);
nLength = objBasic.TypeInformationLength;
while ((uint)(nReturn = NativeWin32Api.NtQueryObject(ipHandle, (int)NativeWin32Api.ObjectInformationClass.ObjectTypeInformation, ipObjectType, nLength, ref nLength)) == NativeWin32Api.STATUS_INFO_LENGTH_MISMATCH)
{
Marshal.FreeHGlobal(ipObjectType);
ipObjectType = Marshal.AllocHGlobal(nLength);
}
objObjectType = (NativeWin32Api.OBJECT_TYPE_INFORMATION)Marshal.PtrToStructure(ipObjectType, objObjectType.GetType());
if (Is64BitsSystem())
{
ipTemp = new IntPtr(Convert.ToInt64(objObjectType.Name.Buffer.ToString(), 10) >> 32);
}
else
{
ipTemp = objObjectType.Name.Buffer;
}
strObjectTypeName = Marshal.PtrToStringUni(ipTemp, objObjectType.Name.Length >> 1);
Marshal.FreeHGlobal(ipObjectType);
if (strObjectTypeName != "File")
return null;
nLength = objBasic.NameInformationLength;
ipObjectName = Marshal.AllocHGlobal(nLength);
while ((uint)(nReturn = NativeWin32Api.NtQueryObject(ipHandle, (int)NativeWin32Api.ObjectInformationClass.ObjectNameInformation, ipObjectName, nLength, ref nLength)) == NativeWin32Api.STATUS_INFO_LENGTH_MISMATCH)
{
Marshal.FreeHGlobal(ipObjectName);
ipObjectName = Marshal.AllocHGlobal(nLength);
}
objObjectName = (NativeWin32Api.OBJECT_NAME_INFORMATION)Marshal.PtrToStructure(ipObjectName, objObjectName.GetType());
if (Is64BitsSystem())
{
ipTemp = new IntPtr(Convert.ToInt64(objObjectName.Name.Buffer.ToString(), 10) >> 32);
}
else
{
ipTemp = objObjectName.Name.Buffer;
}
if (ipTemp != IntPtr.Zero)
{
byte[] baTemp = new byte[nLength];
try
{
Marshal.Copy(ipTemp, baTemp, 0, nLength);
strObjectName = Marshal.PtrToStringUni(Is64BitsSystem() ? new IntPtr(ipTemp.ToInt64()) : new IntPtr(ipTemp.ToInt32()));
}
catch (AccessViolationException)
{
return null;
}
finally
{
Marshal.FreeHGlobal(ipObjectName);
NativeWin32Api.CloseHandle(ipHandle);
}
}
string path = GetRegularFileNameFromDevice(strObjectName);
try
{
return path;
}
catch
{
return null;
}
}
private static string GetRegularFileNameFromDevice(string strRawName)
{
string strFileName = strRawName;
foreach (string strDrivePath in Environment.GetLogicalDrives())
{
StringBuilder sbTargetPath = new StringBuilder(NativeWin32Api.MAX_PATH);
if (NativeWin32Api.QueryDosDevice(strDrivePath.Substring(0, 2), sbTargetPath, NativeWin32Api.MAX_PATH) == 0)
{
return strRawName;
}
string strTargetPath = sbTargetPath.ToString();
if (strFileName.StartsWith(strTargetPath))
{
strFileName = strFileName.Replace(strTargetPath, strDrivePath.Substring(0, 2));
break;
}
}
return strFileName;
}
private static List<nativewin32api.system_handle_information> GetHandlesFromProcess(Process process)
{
uint nStatus;
int nHandleInfoSize = 0x10000;
IntPtr ipHandlePointer = Marshal.AllocHGlobal(nHandleInfoSize);
int nLength = 0;
IntPtr ipHandle = IntPtr.Zero;
while ((nStatus = NativeWin32Api.NtQuerySystemInformation(CNST_SYSTEM_HANDLE_INFORMATION, ipHandlePointer, nHandleInfoSize, ref nLength)) == STATUS_INFO_LENGTH_MISMATCH)
{
nHandleInfoSize = nLength;
Marshal.FreeHGlobal(ipHandlePointer);
ipHandlePointer = Marshal.AllocHGlobal(nLength);
}
byte[] baTemp = new byte[nLength];
Marshal.Copy(ipHandlePointer, baTemp, 0, nLength);
long lHandleCount = 0;
if (Is64BitsSystem())
{
lHandleCount = Marshal.ReadInt64(ipHandlePointer);
ipHandle = new IntPtr(ipHandlePointer.ToInt64() + 8);
}
else
{
lHandleCount = Marshal.ReadInt32(ipHandlePointer);
ipHandle = new IntPtr(ipHandlePointer.ToInt32() + 4);
}
NativeWin32Api.SYSTEM_HANDLE_INFORMATION shHandle;
List<nativewin32api.system_handle_information> lstHandles = new List<nativewin32api.system_handle_information>();
for (long lIndex = 0; lIndex < lHandleCount; lIndex++)
{
shHandle = new NativeWin32Api.SYSTEM_HANDLE_INFORMATION();
if (Is64BitsSystem())
{
shHandle = (NativeWin32Api.SYSTEM_HANDLE_INFORMATION)Marshal.PtrToStructure(ipHandle, shHandle.GetType());
ipHandle = new IntPtr(ipHandle.ToInt64() + Marshal.SizeOf(shHandle) + 8);
}
else
{
ipHandle = new IntPtr(ipHandle.ToInt64() + Marshal.SizeOf(shHandle));
shHandle = (NativeWin32Api.SYSTEM_HANDLE_INFORMATION)Marshal.PtrToStructure(ipHandle, shHandle.GetType());
}
if (shHandle.ProcessID != process.Id) continue;
lstHandles.Add(shHandle);
}
return lstHandles;
}
private static bool Is64BitsSystem()
{
return Marshal.SizeOf(typeof(IntPtr)) == 8 ? true : false;
}
internal class NativeWin32Api
{
[DllImport("ntdll.dll")]
public static extern int NtQueryObject(IntPtr ObjectHandle, int
ObjectInformationClass, IntPtr ObjectInformation, int ObjectInformationLength,
ref int returnLength);
[DllImport("kernel32.dll", SetLastError = true)]
public static extern uint QueryDosDevice(string lpDeviceName, StringBuilder lpTargetPath, int ucchMax);
[DllImport("ntdll.dll")]
public static extern uint NtQuerySystemInformation(int
SystemInformationClass, IntPtr SystemInformation, int SystemInformationLength,
ref int returnLength);
[DllImport("kernel32.dll")]
public static extern IntPtr OpenProcess(ProcessAccessFlags dwDesiredAccess, [MarshalAs(UnmanagedType.Bool)] bool bInheritHandle, int dwProcessId);
[DllImport("kernel32.dll")]
public static extern int CloseHandle(IntPtr hObject);
[DllImport("kernel32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool DuplicateHandle(IntPtr hSourceProcessHandle,
ushort hSourceHandle, IntPtr hTargetProcessHandle, out IntPtr lpTargetHandle,
uint dwDesiredAccess, [MarshalAs(UnmanagedType.Bool)] bool bInheritHandle, uint dwOptions);
[DllImport("kernel32.dll")]
public static extern IntPtr GetCurrentProcess();
public enum ObjectInformationClass : int
{
ObjectBasicInformation = 0,
ObjectNameInformation = 1,
ObjectTypeInformation = 2,
ObjectAllTypesInformation = 3,
ObjectHandleInformation = 4
}
[Flags]
public enum ProcessAccessFlags : uint
{
All = 0x001F0FFF,
Terminate = 0x00000001,
CreateThread = 0x00000002,
VMOperation = 0x00000008,
VMRead = 0x00000010,
VMWrite = 0x00000020,
DupHandle = 0x00000040,
SetInformation = 0x00000200,
QueryInformation = 0x00000400,
Synchronize = 0x00100000
}
[StructLayout(LayoutKind.Sequential)]
public struct OBJECT_BASIC_INFORMATION
{
public int Attributes;
public int GrantedAccess;
public int HandleCount;
public int PointerCount;
public int PagedPoolUsage;
public int NonPagedPoolUsage;
public int Reserved1;
public int Reserved2;
public int Reserved3;
public int NameInformationLength;
public int TypeInformationLength;
public int SecurityDescriptorLength;
public System.Runtime.InteropServices.ComTypes.FILETIME CreateTime;
}
[StructLayout(LayoutKind.Sequential)]
public struct OBJECT_TYPE_INFORMATION
{
public UNICODE_STRING Name;
public int ObjectCount;
public int HandleCount;
public int Reserved1;
public int Reserved2;
public int Reserved3;
public int Reserved4;
public int PeakObjectCount;
public int PeakHandleCount;
public int Reserved5;
public int Reserved6;
public int Reserved7;
public int Reserved8;
public int InvalidAttributes;
public GENERIC_MAPPING GenericMapping;
public int ValidAccess;
public byte Unknown;
public byte MaintainHandleDatabase;
public int PoolType;
public int PagedPoolUsage;
public int NonPagedPoolUsage;
}
[StructLayout(LayoutKind.Sequential)]
public struct OBJECT_NAME_INFORMATION
{
public UNICODE_STRING Name;
}
[StructLayout(LayoutKind.Sequential, Pack = 1)]
public struct UNICODE_STRING
{
public ushort Length;
public ushort MaximumLength;
public IntPtr Buffer;
}
[StructLayout(LayoutKind.Sequential)]
public struct GENERIC_MAPPING
{
public int GenericRead;
public int GenericWrite;
public int GenericExecute;
public int GenericAll;
}
[StructLayout(LayoutKind.Sequential, Pack = 1)]
public struct SYSTEM_HANDLE_INFORMATION
{
public int ProcessID;
public byte ObjectTypeNumber;
public byte Flags;
public ushort Handle;
public int Object_Pointer;
public UInt32 GrantedAccess;
}
public const int MAX_PATH = 260;
public const uint STATUS_INFO_LENGTH_MISMATCH = 0xC0000004;
public const int DUPLICATE_SAME_ACCESS = 0x2;
}
#endregion
}
}
[enhzflep:Encoded (&<>") chars]