win32file.DeviceIoControl(FSCTL_GET_RETRIEVAL_POIN TERS)

[Jim]

I'm not sure how to perform this operation in Python. The difficulty is
in knowing the size of the output buffer: if it is too small, I get an
"insufficient buffer" exception; too large, and I get an "end of file"
exception. In neither case is any partial data available.

I'd rather not resort to a binary seach...

[Martin v. Löwis]

Jim schrieb:

I'm not sure how to perform this operation in Python. The difficulty is
in knowing the size of the output buffer: if it is too small, I get an
"insufficient buffer" exception; too large, and I get an "end of file"
exception. In neither case is any partial data available.

What precisely is the "end of file" exception you are getting. Looking
at

http://msdn.microsoft.com/library/de...l_pointers.asp

I'd say it is

ERROR_HANDLE_EOF The volume is an NTFS file system volume and the
requested starting VCN is past the end of the file.

So my guess is you should just pass a smaller starting VCN.

Regards,
Martin

[Jim]

Mea culpa: files with *no* clusters return the end-of-file error.