C / C++ / MFC

<br />
<br />
...<br />
<br />
// the following loop try to send a command and read the answer<br />
while( retry> 0 )<br />
{<br />
<br />
  // the problem is here, when that function fails 		<br />
  if( !ClearCommError( idCommDev, &dwError,&comstatInfo ))<br />
{<br />
   lResult = 116;<br />
  dwLasError = GetLastError();  // I call GetLastError() but I get -1.  ???????<br />
   return lResult;<br />
}<br />
<br />
if( !PurgeComm( idCommDev, PURGE_TXABORT | PURGE_RXABORT | PURGE_TXCLEAR | PURGE_RXCLEAR ))<br />
{<br />
  lResult = 115;<br />
  return lResult;<br />
}<br />
// Send a command<br />
lResult = TXPacket(dataTX, 250);<br />
<br />
if( lResult!= 0 )<br />
   return lResult;<br />
<br />
// Read the answer<br />
lResult = RXPacket(dataRX, timeout);<br />
....<br />
<br />

DirInfo[0].hDir = CreateFile(sDirectory, // pointer to the file name
					FILE_LIST_DIRECTORY,
                    FILE_SHARE_READ |
                    FILE_SHARE_WRITE |
                    FILE_SHARE_DELETE,
                    NULL,
                    OPEN_EXISTING,
                    FILE_FLAG_BACKUP_SEMANTICS |
                    FILE_FLAG_OVERLAPPED,
                    NULL									// file with attributes to copy
					);
	if(DirInfo[0].hDir==INVALID_HANDLE_VALUE)
		return IDS_ERRCREATEFILE;
	hCompPort=0;
	// Set up a key(directory info) for each directory
    hCompPort=CreateIoCompletionPort( DirInfo[0].hDir,
                                      hCompPort,
                                      (DWORD) &DirInfo[0],
                                      0);
	if(!hCompPort)
		return IDS_ERRCREATEIOPORT;

	// Start watching each of the directories of interest
    ReadDirectoryChangesW( DirInfo[0].hDir,
                           DirInfo[0].lpBuffer,
                           MAX_BUFFER,
                           TRUE,
                           FILE_NOTIFY_CHANGE_SECURITY|
							FILE_NOTIFY_CHANGE_CREATION|
							FILE_NOTIFY_CHANGE_LAST_ACCESS|
							FILE_NOTIFY_CHANGE_LAST_WRITE|
							FILE_NOTIFY_CHANGE_SIZE|
							FILE_NOTIFY_CHANGE_ATTRIBUTES|
							FILE_NOTIFY_CHANGE_DIR_NAME|
							FILE_NOTIFY_CHANGE_FILE_NAME,
                           &DirInfo[0].dwBufLength,&DirInfo[0].Overlapped,
                           NULL);

unsigned __stdcall CFileChangeWatch::DoFileChangeWatch(void *_pcFileChangeWatch)
{
	DWORD numBytes;
	DWORD cbOffset;
	LPDIRECTORY_INFO di;
	LPOVERLAPPED lpOverlapped;
	PFILE_NOTIFY_INFORMATION fni;
	CString      szFullFileName;
	CFileChangeWatch *pcFileChangeWatch=(CFileChangeWatch *)_pcFileChangeWatch;
	char sBuff[256];
	CString sPath;

	do
	{
		// Retrieve the directory info for this directory
		// through the completion key
		GetQueuedCompletionStatus( (HANDLE) pcFileChangeWatch->hCompPort,
								   &numBytes,
								   (LPDWORD) &di,
								   &lpOverlapped,
								   INFINITE);
		if ( di )
		{
			fni = (PFILE_NOTIFY_INFORMATION)di->lpBuffer;
			do
			{
				cbOffset = fni->NextEntryOffset;

				szFullFileName=di->lpszDirName;
				szFullFileName=szFullFileName + "\\";
				szFullFileName=szFullFileName+ CString(fni->FileName).Left(fni->FileNameLength / 2);

				//OutputDebugString(szFullFileName);
				//OutputDebugString(" ");

				// test for fdf
				if(!strcmp(szFullFileName.Right(3),"fdf"))
				{

					DBAction 					// classify action
					switch(fni->Action)
					{
						case FILE_ACTION_ADDED:							
														break;
						case FILE_ACTION_REMOVED:
														break;
						case FILE_ACTION_MODIFIED:
							
							break;
						case FILE_ACTION_RENAMED_OLD_NAME:
							
							break;
						case FILE_ACTION_RENAMED_NEW_NAME:
														break;
						default:;
					}


				// next action
				fni = (PFILE_NOTIFY_INFORMATION)((LPBYTE) fni + cbOffset);
			} while( cbOffset );

			// Reissue the watch command
			ReadDirectoryChangesW(	di->hDir,di->lpBuffer,
									MAX_BUFFER,
									TRUE,
									FILE_NOTIFY_CHANGE_SECURITY|
									FILE_NOTIFY_CHANGE_CREATION|
									FILE_NOTIFY_CHANGE_LAST_ACCESS|
									FILE_NOTIFY_CHANGE_LAST_WRITE|
									FILE_NOTIFY_CHANGE_SIZE|
									FILE_NOTIFY_CHANGE_ATTRIBUTES|
									FILE_NOTIFY_CHANGE_DIR_NAME|
									FILE_NOTIFY_CHANGE_FILE_NAME,
									&di->dwBufLength,
									&di->Overlapped,
									NULL);
		}

	} while( di );

	return 0;
};