windows - NTFS Filesystem Time -


I tested it on Windows XP.

If I do

  2. Write the file.
  3. Close the file. (Then, the last time of the file has changed)

But if

  • set the last file time of the file.
  • Check the time by calling GetFileTime (Then, the final version of the file changes
  • Sleep in 20 seconds.
  • Write the file.
  • Sleep 20 seconds.
  • Close the file.
  • Check time by calling GetFileTime (process 5 time has never been applied. Why? )

    • Edit : 

      Wstring filename = L "D: \\ testfile.txt"; Handle H = Make FileW (Filename. Cstr), generic_write | GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, 0, CREATE_ALWAYS, 0, 0); FILETIME ft1, ft2, ft3; If (GetFileTime (H, FT1, and FT2, and FT3)) {return; } Std :: cout & lt; & Lt; Ft3.dwHighDateTime & lt; & Lt; Std :: endl & lt; & Lt; Ft3.dwLowDateTime & lt; & Lt; Std :: endl; Ft1.dwLowDateTime = 1000000; If (Setfiletime (H, FT1, and FT1, and FT1)) {return; } If (GetFileTime (H, FT1, & FT2, and FT3)) {return; } Std :: cout & lt; & Lt; Ft3.dwHighDateTime & lt; & Lt; Std :: endl & lt; & Lt; Ft3.dwLowDateTime & lt; & Lt; Std :: endl; Sleep (5000); TCHR buffer [] = L "test 1234567890 test 1234567890 test 1234567890 test 1234567890 test 1234567890 \ r \ n"; Write DWORDbits = 0; BOOL fOk = WriteFile (H, buffer, size (buffer), and writebays, 0); If (! FOK) {return; } If (written! = Size (buffer)) {return; } If (GetFileTime (H, FT1, & FT2, and FT3)) {return; } Std :: cout & lt; & Lt; Ft3.dwHighDateTime & lt; & Lt; Std :: endl & lt; & Lt; Ft3.dwLowDateTime & lt; & Lt; Std :: endl; CloseHandle (h); H = CreateFileW (fileName.c_str), GENERIC_WRITE | GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, 0, OPEN_EXISTING, 0, 0); If (GetFileTime (H, FT1, and FT2, and FT3)) {return; } Std :: cout & lt; & Lt; Ft3.dwHighDateTime & lt; & Lt; Std :: endl & lt; & Lt; Ft3.dwLowDateTime & lt; & Lt; Std :: endl; CloseHandle (h); DeleteFile (fileName.c_str ());

    Can you explain to me about this? Thank you.

    Try calling FlushFileBuffers (h) to change time stamps Use the FILE_FLAG_WRITE_THROUGH and FILE_FLAG_NO_BUFFERING flag while opening or after opening the file. See in:

    A write request through FILE_FLAG_WRITE_THROUGH also causes NTFS to flush any metadata changes, such as time stamp updates or rename operations, which are requested The result of processing is For this reason, the FILE_FLAG_WRITE_THROUGH flag is often used with the FILE_FLAG_NO_BUFFERING flag as a replacement for calling the FluffFilf buffers function after each write, which can cause unnecessary performance penalties. Using these flags to avoid those penalties For general information about caching files and metadata, see file caching.


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