Get size of file on disk

by

This uses GetCompressedFileSize, as ho1 suggested, as well as GetDiskFreeSpace, as PaulStack
suggested, it does, however, use P/Invoke. I have tested it only for compressed files, and I suspect it does not work for fragmented files.

public static long GetFileSizeOnDisk(string file)
{
    FileInfo info = new FileInfo(file);
    uint dummy, sectorsPerCluster, bytesPerSector;
    int result = GetDiskFreeSpaceW(info.Directory.Root.FullName, out sectorsPerCluster, out bytesPerSector, out dummy, out dummy);
    if (result == 0) throw new Win32Exception();
    uint clusterSize = sectorsPerCluster * bytesPerSector;
    uint hosize;
    uint losize = GetCompressedFileSizeW(file, out hosize);
    long size;
    size = (long)hosize << 32 | losize;
    return ((size + clusterSize - 1) / clusterSize) * clusterSize;
}

[DllImport("kernel32.dll")]
static extern uint GetCompressedFileSizeW([In, MarshalAs(UnmanagedType.LPWStr)] string lpFileName,
   [Out, MarshalAs(UnmanagedType.U4)] out uint lpFileSizeHigh);

[DllImport("kernel32.dll", SetLastError = true, PreserveSig = true)]
static extern int GetDiskFreeSpaceW([In, MarshalAs(UnmanagedType.LPWStr)] string lpRootPathName,
   out uint lpSectorsPerCluster, out uint lpBytesPerSector, out uint lpNumberOfFreeClusters,
   out uint lpTotalNumberOfClusters);

More Related Contents:

  1. How do I get a human-readable file size in bytes abbreviation using .NET?
  2. How do I get the path of the assembly the code is in?
  3. How to loop through all enum values in C#? [duplicate]
  4. Why is a Dictionary “not ordered”?
  5. How can I automatically filter out soft deleted entities with Entity Framework?
  6. BackgroundWorker RunWorkerCompleted Event
  7. When should TaskCompletionSource be used?
  8. Performance Tests of Serializations used by WCF Bindings
  9. Determine what control the ContextMenuStrip was used on
  10. Best way to access COM objects from C#
  11. Static Indexers?
  12. Timezone Abbreviations
  13. Event Signature in .NET — Using a Strong Typed ‘Sender’? [closed]
  14. How can I prevent synchronous continuations on a Task?
  15. How to send an email in .Net according to new security policies?
  16. how to make a wizard with ASP.Net MVC
  17. Ignoring null fields in Json.net
  18. Custom Caret for WinForms TextBox
  19. Image.Save() throws exception “Value cannot be null./r/nParameter name: encoder”
  20. Hosting ASP.NET Core API in a Windows Forms Application
  21. How to stop Windows service programmatically
  22. Checking for null before ToString()
  23. Last and LastOrDefault not supported
  24. How to make a button appear as if it is pressed?
  25. Is it possible to create some IGrouping object
  26. How can I disable compiler optimization in C#?
  27. Condition Variables C#/.NET
  28. ComboBox AutoComplete on SubString
  29. XmlSerializer property converter
  30. Limit only one session per user in ASP.NET

Leave a Comment