help with translation from MSDN for ReadDirectoryChangesW to monitor directories

[Wayne Diamond]

This seems like a very cool API and seemingly straight-forward enough - just call CreateFile to get a handle on the directory you want to monitor, and call this API - it's then supposed to get back to you when an event occurs in that directory (basically the same as FindFileNotification, but better because it tells you WHAT changed). Unfortunately it's only supported on NT and Win2K, not Win9x.

Here's the reference for ReadDirectoryChangesW - http://msdn.microsoft.com/library/ps...lesio_97av.htm

There's also a very small and simple visual c++ demo at http://msdn.microsoft.com/library/de...hangeswapi.htm
Even I was able to compile it but that's no good because I can't read C++ <grin> - it worked well though

Is there anybody kind enough that could help me translate these so as to call them from PB? It may even be possible to monitor C:\ and all subdirectories in the one API call, but as Im not good enough with PB yet as to be able to translate MSDN definitions to it, I'm a bit stuck

Here's the MSDN definitions:

BOOL ReadDirectoryChangesW(
  HANDLE hDirectory,                                  // handle to directory
  LPVOID lpBuffer,                                    // read results buffer
  DWORD nBufferLength,                                // length of buffer
  BOOL bWatchSubtree,                                 // monitoring option
  DWORD dwNotifyFilter,                               // filter conditions
  LPDWORD lpBytesReturned,                            // bytes returned
  LPOVERLAPPED lpOverlapped,                          // overlapped buffer
  LPOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine // completion routine
);

typedef struct _FILE_NOTIFY_INFORMATION {
  DWORD NextEntryOffset;
  DWORD Action;
  DWORD FileNameLength;
  WCHAR FileName[1];
} FILE_NOTIFY_INFORMATION, *PFILE_NOTIFY_INFORMATION;

Here's my PB translation:

TYPE FILE_NOTIFY_INFORMATION
  NextEntryOffset AS DWORD
  Action AS DWORD
  FileNameLength AS DWORD
  FileName AS STRING * 1
END TYPE

DECLARE FUNCTION ReadDirectoryChangesW LIB "KERNEL32.DLL" ALIAS "ReadDirectoryChangesW" ( _
  hDirectory AS LONG, _
  lpBuffer AS FILE_NOTIFY_INFORMATION, _
  nBufferLength AS DWORD, _
  bWatchSubtree AS INTEGER, _
  dwNotifyFilter AS DWORD, _
  lpBytesReturned AS DWORD, _
  xtmp1 AS DWORD, _
  xtmp2 AS DWORD) AS LONG

It compiles fine, but I'm not sure if the translation is correct, and Ive got no idea how to call such a beast!


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[This message has been edited by Wayne Diamond (edited April 09, 2001).]