Bugs item #1532684, was opened at 2006-08-01 13:10 Message generated for change (Tracker Item Submitted) made by Item Submitter You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=107586&aid=1532684&group_id=7586 Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: None Group: None Status: Open Resolution: None Priority: 5 Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: Changing size of memory-mapped file on Windows Initial Comment: My email address is barrywhart@yahoo.com. There is a bug in mapped_file_source::open_impl(mapped_file_params p) This function does not correctly check for errors from SetFilePointer, as documented in the MSDN page below. (See "Case Two: calling the function with lpDistanceToMoveHigh != NULL") http://msdn.microsoft.com/library/default.asp?url=/library/en-us/fileio/fs/s... Current code: ::SetFilePointer(pimpl_->handle_, sizelow, &sizehigh, FILE_BEGIN); if (::GetLastError() != NO_ERROR || !::SetEndOfFile(pimpl_->handle_)) detail::cleanup_and_throw(*pimpl_, "failed setting file size"); Should be: DWORD dwResult = ::SetFilePointer(pimpl_->handle_, sizelow, &sizehigh, FILE_BEGIN); if (dwResult == INVALID_SET_FILE_POINTER ::GetLastError() != NO_ERROR || !::SetEndOfFile(pimpl_->handle_)) detail::cleanup_and_throw(*pimpl_, "failed setting file size"); -- Even after this fix, the ability to resize an existing file is not really useful because the file is apparently recreated rather than resized. I am working around this by resizing the file using system calls, but I wonder if this is how the function is supposed to work?! ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=107586&aid=1532684&group_id=7586 ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Boost-bugs mailing list Boost-bugs@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/boost-bugs