/// <summary>
/// Obtain the low-level information of the file stream specified.
/// </summary>
public static void GetLowLevelFileInfo(FileStream stream, out UInt64 fileID, out UInt64 fileSize, out DateTime fileDate)
{
Syscalls.BY_HANDLE_FILE_INFORMATION bhfi;
Syscalls.GetFileInformationByHandle(stream.SafeFileHandle.DangerousGetHandle(), out bhfi);
fileID = (bhfi.FileIndexHigh << 32) + bhfi.FileIndexLow;
fileSize = (bhfi.FileSizeHigh << 32) + bhfi.FileSizeLow;
fileDate = DateTime.FromFileTime((Int64)(((UInt64)bhfi.LastWriteTime.dwHighDateTime << 32) +
(UInt64)bhfi.LastWriteTime.dwLowDateTime));
}
/// <summary>
/// Return the last modification date of a given file system path.
/// If the path leads to a directory, return the creation time of the directory.
/// </summary>
/// <param name="fullPath"></param>
/// <returns></returns>
public static DateTime GetLastModificationDate(string fullPath)
{
FileStream stream = null;
try
{
if (File.Exists(fullPath))
{
Syscalls.BY_HANDLE_FILE_INFORMATION bhfi;
stream = new FileStream(fullPath, FileMode.Open, FileAccess.Read, FileShare.Read);
Syscalls.GetFileInformationByHandle(stream.SafeFileHandle.DangerousGetHandle(), out bhfi);
DateTime observedDate =
DateTime.FromFileTime((Int64)(((UInt64)bhfi.LastWriteTime.dwHighDateTime << 32) +
(UInt64)bhfi.LastWriteTime.dwLowDateTime));
return(observedDate);
}
else if (Directory.Exists(fullPath))
{
return(new DirectoryInfo(fullPath).CreationTime.ToLocalTime());
}
else
{
return(DateTime.MinValue);
}
}
catch (IOException)
{
// If we can't open the file directly, try going with the fileinfo method.
try
{
return(new FileInfo(fullPath).LastWriteTime.ToLocalTime());
}
catch (Exception)
{
return(DateTime.MinValue);
}
}
catch (Exception)
{
return(DateTime.MinValue);
}
finally
{
if (stream != null)
{
stream.Close();
stream = null;
}
}
}
public static UInt64 GetFileSize(string fullPath)
{
FileStream stream = null;
try
{
Syscalls.BY_HANDLE_FILE_INFORMATION bhfi;
stream = new FileStream(fullPath, FileMode.Open, FileAccess.Read, FileShare.Read);
Syscalls.GetFileInformationByHandle(stream.SafeFileHandle.DangerousGetHandle(), out bhfi);
return(((UInt64)bhfi.FileSizeHigh << 32) + bhfi.FileSizeLow);
}
catch (IOException)
{
// If we can't open the file directly, try going with the fileinfo method.
try
{
return((UInt64) new FileInfo(fullPath).Length);
}
catch (Exception)
{
return(0);
}
}
catch (Exception)
{
return(0);
}
finally
{
if (stream != null)
{
stream.Close();
stream = null;
}
}
}
