Question

Any idea how to read data from a file that is locked by another process?

When I try fopen() or CreateFile() or OpenFile() I get sharing violation.

Yet if I go to command prompt and do a “c:> more blah.h” I can see the file. So “more” somehow can read the file. Any idea how it accomplishes that?

Thanks!

Answer 1

fopen is deprecated and msdn recommends fopen_s but sharing isnt enabled for that .

Files opened by fopen_s and _wfopen_s are not sharable. If you require
that a file be sharable, use _fsopen, _wfsopen with the appropriate
sharing mode constant (for example, _SH_DENYNO for read/write
sharing).

use _fsopen to open the file and enable a flag to share ( _SH_DENYNO ) to give sharing access.

fsopen