/// <summary>
/// Determines the file name for a file handle.
/// </summary>
/// <param name="handle">Handle of the file, which name is to be determined.</param>
/// <param name="processId">ID of the owning process.</param>
/// <returns>The name of the file, the object handle points to. If the name could not be determined, an empty string is returned.</returns>
public static string GetFileNameFromHandle(IntPtr handle, int processId)
{
Logger.Log(LogLevel.Debug, "Getting filename: PID=" + processId + " handle=" + handle.ToInt32());
string devicePath;
if (!LowLevelHandleHelper.GetFileNameFromHandle(handle, processId, out devicePath))
{
return(string.Empty);
}
else
{
Logger.Log(LogLevel.Debug, " -> device path is " + devicePath);
}
string dosPath = PathHelper.ConvertDevicePathToDosPath(devicePath);
if (dosPath.Length == 0)
{
return(devicePath);
}
else
{
Logger.Log(LogLevel.Debug, " -> dos path is " + dosPath);
}
return(dosPath);
}
/// <summary>
/// Default constructor. When this constructor is invoked a snapshot of all running processes and
/// their currently open handles is taken.
/// </summary>
public ProcessHandleSnapshot()
{
this.snapshot = new Dictionary <int, List <IntPtr> >();
OpenFilesEnumerator openFiles = new OpenFilesEnumerator();
IEnumerator <SystemHandleEntry> enumerator = openFiles.GetEnumerator();
while (enumerator.MoveNext())
{
SystemHandleEntry entry = enumerator.Current;
int processId = entry.OwnerPid;
IntPtr handle = (IntPtr)entry.HandleValue;
if (LowLevelHandleHelper.IsFileHandle(handle, processId))
{
if (!this.IgnoreSystemHandleEntry(entry))
{
if (!this.snapshot.ContainsKey(processId))
{
this.snapshot.Add(processId, new List <IntPtr>());
}
List <IntPtr> handleList;
if (this.snapshot.TryGetValue(processId, out handleList))
{
handleList.Add(handle);
}
}
}
}
Logger.Log(LogLevel.Debug, "Process handle snapshot contains " + this.snapshot.Count + " entries");
}
/// <summary>
/// Checks if the object handle is a file handle.
/// </summary>
/// <param name="handle">Handle of the object.</param>
/// <param name="processId">Process that owns this handle.</param>
/// <returns>true if and only the handle is a file handle.</returns>
public static bool IsFileHandle(IntPtr handle, int processId)
{
string type = LowLevelHandleHelper.GetHandleTypeToken(handle, processId);
Logger.Log(LogLevel.Debug, string.Format("Getting filetype: PID={0}, handle={1}, type={2}", processId, handle.ToInt32(), type));
return(type.Equals("File"));
}
/// <summary>
/// Tries to delete the file "the hard way". At first this method determines which process(es) has the
/// file in use and closes the file handle of the file within the determined process(es). If this has
/// been done, the file is deleted using File.Delete().
/// </summary>
/// <param name="absoluteFileName">Absolute name of the file to be deleted.</param>
/// <returns>true if and only if the file has been deleted.</returns>
private bool TryHarderDelete(string absoluteFileName)
{
// Windows Vista provides a new API which can be used to determine which process
// has a file opened. This API is nor available on Windows XP so we have check
// all processes on those legacy systems.
bool isVistaOrNewer = SystemHelper.IsWindowsVistaOrNewer();
List <int> processIds = isVistaOrNewer ? UsedFileDetector.GetProcesses(absoluteFileName) : SystemHelper.GetProcesses();
foreach (int pid in processIds)
{
Logger.Log(LogLevel.Debug, "Checking all file handles of process " + pid);
foreach (IntPtr handle in this.snapshot.GetHandles(pid))
{
Logger.Log(LogLevel.Debug, string.Empty);
string fileName = LowLevelHandleHelper.GetFileNameFromHandle(handle, pid);
if (absoluteFileName.Equals(fileName, StringComparison.OrdinalIgnoreCase))
{
Logger.Log(LogLevel.Verbose, "File " + absoluteFileName + " is in use by process with PID " + pid);
this.CloseHandleInRemoteProcess(pid, handle);
break;
}
}
}
File.Delete(absoluteFileName);
return(true);
}
