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Colin B Maharaj
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 Posted: Sat Aug 27, 2005 11:15 am Post subject: File Change Notification |
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Hi folks, I was trying to find a procedure to monitor file updates in
Windows - instead I found one that monitor changes in a path where you
specify the change type. But I may be monitoring hundreds or thousands
of files and to do a file search in a path to see which file has changed
is going to be too time consuming.
Any better suggestions?
Thanks
Colin B Maharaj
Trinidad, WI
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Vladimir Stefanovic
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| Posted: Sat Aug 27, 2005 7:54 pm Post subject: Re: File Change Notification |
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| Quote: | [...] But I may be monitoring hundreds or thousands of files and to do a
file search in a path to see which
file has changed is going to be too time consuming.
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Hmm... I don't know if such techique exists...
I have some projects that monitors specified folder
(and subfolders) for changes, and then I look what
file(s) is(are) changed.
I haven't found any time-delay problems.
I hold the previous files state (file size or file attributes) in
INI file and then compare it with changed once.
I suppose that the notification module you have is a
class, so can you make a couple of notification objects
(not only one) which will decrese the number of files to
monitor?
The problem I had with *all* change notification classes
I found so far was that the event is trigered *multiple*
times for one event ?!...
In practise, that means, when I have to do something (when
the change arrises), my processing code is executed multiple
times for the same set of data.
--
Best regards,
Vladimir Stefanovic
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JD
Guest
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| Posted: Sun Aug 28, 2005 6:21 pm Post subject: Re: File Change Notification |
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"Vladimir Stefanovic" <antivari (AT) po (DOT) sbb.co.yu> wrote:
| Quote: |
[...] The problem I had with *all* change notification
classes I found so far was that the event is trigered
*multiple* times for one event ?!...
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It's not actually. I had a similar problem and found another
application's process was the cause (AOL in this case). A
restart after unloading AOL fixed it.
~ JD
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Vladimir Stefanovic
Guest
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| Posted: Sun Aug 28, 2005 7:07 pm Post subject: Re: File Change Notification |
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| Quote: | It's not actually. I had a similar problem and found another
application's process was the cause (AOL in this case). A
restart after unloading AOL fixed it.
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Hi,
I placed a sample of my code (that executes multiple
times for one change - new file or updated) at attachments
group.
Can you please check it on your machine?
(Maybe there is a bug in my code...)
--
Best regards,
Vladimir Stefanovic
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Remy Lebeau (TeamB)
Guest
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| Posted: Sun Aug 28, 2005 7:36 pm Post subject: Re: File Change Notification |
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"Colin B Maharaj" <noreply (AT) myhost (DOT) com> wrote
| Quote: | Hi folks, I was trying to find a procedure to monitor file updates
in Windows - instead I found one that monitor changes in a path
where you specify the change type. But I may be monitoring hundreds
or thousands of files and to do a file search in a path to see which file
has changed is going to be too time consuming.
|
What EXACTLY are you trying to monitor to begin with? Have you looked at
SHChangeNotifyRegister() yet?
http://msdn.microsoft.com/library/en-us/shellcc/platform/shell/reference/functions/shchangenotifyregister.asp
Gambit
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JD
Guest
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| Posted: Tue Aug 30, 2005 12:47 pm Post subject: Re: File Change Notification |
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"Vladimir Stefanovic" <antivari (AT) po (DOT) sbb.co.yu> wrote:
| Quote: |
[...] Can you please check it on your machine?
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I'll look at it as soon as I get a chance. In the mean time:
//-------------------------------------------------------------
void __fastcall TMonitorThread::Execute()
{
HANDLE hFind = FindFirstChangeNotification(FPath.c_str(), false, FILE_NOTIFY_CHANGE_LAST_WRITE);
if( hFind != INVALID_HANDLE_VALUE )
{
while( !Terminated )
{
switch( WaitForSingleObject(hFind, 500) )
{
case WAIT_OBJECT_0: PostMessage(Application->MainForm->Handle, CUSTOM_MESSAGE, 0, 0 );
if( !FindNextChangeNotification(hFind) ) Terminate();
break;
case WAIT_TIMEOUT: break;
default : Terminate();
}
}
FindCloseChangeNotification(hFind);
}
}
//-------------------------------------------------------------
~ JD
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