DirectoryWatcher - FILE_NOTIFY_INFORMATION structure

Hallo zusammen,

ich versuche mich daran einen DirectoryWatcher zu überarbeiten.
Nun tritt bei u.g. Code das Problem auf, dass zwar die Umbenennung von
Dateien korrekt angezeigt wird, jedoch der neue Name eines Ordners nicht
ausgegeben wird.

Aktion: c:\test\a wird in c:\test\b umbenannt
Output: renamed c:\test\a

Ich hätte hier noch den neuen Namen des Ordners erwartet

CString m_dir("c:\\test");
 HANDLE hDir = CreateFile( CString(m_dir),   // pointer to the file path 
     FILE_LIST_DIRECTORY,                // access (read/write) mode
     FILE_SHARE_READ|FILE_SHARE_WRITE,  // share mode
     NULL,                               // security descriptor
     OPEN_EXISTING,                      // how to create
     FILE_FLAG_BACKUP_SEMANTICS, //|FILE_FLAG_OVERLAPPED,         // file attributes
     NULL                                // file with attributes to copy
 );

 FILE_NOTIFY_INFORMATION Buffer[1024];
 DWORD BytesReturned;
 while (true) {
  int ret = ReadDirectoryChangesW(
      hDir,       // handle to directory
      &Buffer,      // read results buffer
      sizeof(Buffer),     // length of buffer
      TRUE,       // monitoring option
      // filter conditions
      FILE_NOTIFY_CHANGE_SECURITY|
      FILE_NOTIFY_CHANGE_SIZE|  // in file or subdir
      FILE_NOTIFY_CHANGE_ATTRIBUTES|
      FILE_NOTIFY_CHANGE_DIR_NAME| // creating, deleting a directory or sub
      FILE_NOTIFY_CHANGE_FILE_NAME, // renaming,creating,deleting a file
      &BytesReturned,     // bytes returned
      NULL,       // overlapped buffer
      NULL       // completion routine
  );

  CString filename = m_dir + "\\"+ CString(Buffer[0].FileName).Left(Buffer[0].FileNameLength / 2);
  switch(Buffer[0].Action)
  {
   case FILE_ACTION_ADDED: 
	   MessageBox("added",filename);
    printf("%s\n+: %s\n","Triggered by add", filename);
    break; 
   case FILE_ACTION_REMOVED: 
	   MessageBox("removed",filename);
	   printf("%s\nx: %s\n","Triggered by removed", filename);
    break; 
   case FILE_ACTION_MODIFIED: 
	   	   MessageBox("modified",filename);
    printf("%s\nm: %s\n","Triggered by modified", filename);
    break; 
   case FILE_ACTION_RENAMED_OLD_NAME: 
	   	   	   MessageBox("renamed",filename);
    printf("%s\n%s -> %s\n","Triggered by rename", filename,
     CString(Buffer[1].FileName).Left(Buffer[1].FileNameLength / 2));
    break; 
   case FILE_ACTION_RENAMED_NEW_NAME: 
	   	   	   MessageBox("renamed new",filename);
    printf("%s\n -> %s\n","Triggered by rename 2", filename);
    break;
  }
 }
 CloseHandle( hDir );

merano

MSDN sagt:

Directory changes that occur between calls to this function are added to
the buffer and then returned with the next call.

Es würde sich also evtl. lohnen nicht nur am Anfang des Buffers zu suchen ...

switch(Buffer[0].Action)

Ausserdem ist die Abfrage in einer Endlosschleife möglicherweise nicht so
ganz sinnvoll.

Möglicherweise wäre das hier interessant:

Obtaining Directory Change Notifications

http://msdn.microsoft.com/en-us/library/aa365261.aspx