Monitor a directory using WaitForMultipleObjects

From:
alokmahto2007@gmail.com
Newsgroups:
microsoft.public.vc.language
Date:
21 Mar 2007 08:39:50 -0700
Message-ID:
<1174491590.597406.231050@e1g2000hsg.googlegroups.com>
Platform : Windows2000, XP,

Microsoft Visual C++ .NET (Version 7.1)

I need to process the files in a directory immediately the moment it
gets
 deposited in a directory.
 I am trying to achieve this by running WaitForMultipleObjects ,
 FindFirstChangeNotificationAPI, FindNextChangeNotification in a
While
 loop

When I use dos command copy in batch file for copying file from
one folder to other

then my application reads from the destination directory smoothly.

But when I use move command, file moved from one directory to another
but my aplication does not read the file from the directory.

(Please see excerpts of code below:)
 int CMyWorkThread::Run()
 {
 ASSERT_VALID(GetWork());
 CDirEventReceiverWork* dirWrk =
 dynamic_cast<CDirEventReceiverWork*>(GetWork());
 try
 {
 DWORD timeout = GetCycleTime();
 BOOL waitAll = FALSE;
 DWORD dwWaitStatus;
 while (TRUE)
 {
 try
 {
 dirWrk->GetEventDirectoryList(con);
 dwChangeHandle= FindFirstChangeNotification ( lpDir, // directory to
watch
 subDirState, // do not watch subtree
 FILE_NOTIFY_CHANGE_CREATION |FILE_NOTIFY_CHANGE_LAST_WRITE); //
watch file name changes

 AddToHandleMap(dwChangeHandle, &ci);

 dwChangeHandles = GetHandleList();

 int nHandles = m_pDirEventServer.GetHandleMap().size()+ 2;

 dwWaitStatus = WaitForMultipleObjects(nHandles, dwChangeHandles,

 waitAll, timeout);

 if(dwWaitStatus == WAIT_TIMEOUT )

 {
 //Refresh receiver list
 continue;
 }
 if((dwWaitStatus == WAIT_OBJECT_0 + 0) || (dwWaitStatus ==
WAIT_OBJECT_0
 + 1) )
 {
 //signalled kill event
 break;
 }

 if((dwWaitStatus <= (WAIT_OBJECT_0 +1)) || (dwWaitStatus >=
nHandles))

 {
 ASSERT(false);
 ostringstream ost;
 ost << "Invalid wait return value [" << dwWaitStatus << "]";
 CABIException(PROGRAM_ERROR, ost.str(), __FILE__, __LINE__);
 continue;
 }

 if(dwWaitStatus == m_pDirEventServer.GetHandleMap().size())
 {
 //signalled kill event
 break;
 }

 //Process the files
 }

Any suggestion or solution will be the great help for me.
Regards

Alok Mahto

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