Exclusive file access

[cubaman]

Hello:
Im workin with an app that checks for incoming files to a given folder
using a FileSystemWatch er object. My problem is that if the file is
too big, the Created event fires before the file is completely copied
to the folder, and it result in IOException, the file is been used by
another process...
I thought that if i could get exclusive acces to the file it means
that the file is already copied in disc.
bool inUse = true;
FileStream strm = null;
do {
try {
strm = new FileStream(file Name, FileMode.Open,
FileAccess.Read , FileShare.None) ;
strm.Close();
strm.Dispose();
inUse = false;
}
catch (IOException) {
inUse = true;
LogHelper.Write Log("File " + fileName + " still in
process.");
if(strm != null) {
strm.Dispose();
}
}
} while (inUse == true);

But this code is a never-ending loop. Even if i see that the file is
already copied in the folder, i can't get inUse= true. Maybe cause
FileSystemWatch er have some reference to it...
Any ideas of how to make this code works? Or how to know when the
incoming file is completely copied to destination folder?
Thank you very much!

Oscar Acosta

[Mr. Arnold]

"cubaman" <os************ ******@googlema il.comwrote in message
news:11******** **************@ q69g2000hsb.goo glegroups.com.. .

Hello:
Im workin with an app that checks for incoming files to a given folder
using a FileSystemWatch er object. My problem is that if the file is
too big, the Created event fires before the file is completely copied
to the folder, and it result in IOException, the file is been used by
another process...
I thought that if i could get exclusive acces to the file it means
that the file is already copied in disc.

But this code is a never-ending loop. Even if i see that the file is
already copied in the folder, i can't get inUse= true. Maybe cause
FileSystemWatch er have some reference to it...
Any ideas of how to make this code works? Or how to know when the
incoming file is completely copied to destination folder?
Thank you very much!

Maybe if you know the file is of a certain size, you can check for size
limit and if it's limit, send your routine into a wait period using a
timer, maybe in the event.

I have seen one example in .Net Application Block code where the example was
using a FileWatcher and in the code it was making the FileWatcher wait.

[cubaman]

On Jun 28, 2:21 pm, "Mr. Arnold" <MR. Arn...@Arnold.c omwrote:

"cubaman" <oscar.acostamo nte...@googlema il.comwrote in message

news:11******** **************@ q69g2000hsb.goo glegroups.com.. .

Hello:
Im workin with an app that checks for incoming files to a given folder
using a FileSystemWatch er object. My problem is that if the file is
too big, the Created event fires before the file is completely copied
to the folder, and it result in IOException, the file is been used by
another process...
I thought that if i could get exclusive acces to the file it means
that the file is already copied in disc.
But this code is a never-ending loop. Even if i see that the file is
already copied in the folder, i can't get inUse= true. Maybe cause
FileSystemWatch er have some reference to it...
Any ideas of how to make this code works? Or how to know when the
incoming file is completely copied to destination folder?
Thank you very much!

Maybe if you know the file is of a certain size, you can check for size
limit and if it's limit, send your routine into a wait period using a
timer, maybe in the event.

I have seen one example in .Net Application Block code where the example was
using a FileWatcher and in the code it was making the FileWatcher wait.

Hello Arnold, thanks for your reply.
No, file is coming over ftp, so I dont know size. Also, windows
reserve all necesary disc space before copying the file, so it reports
real size since the begin of copy proccess.
I also tried to read attributes, but file is no readonly while copy is
in process, as it shoul be...
Any other sugestion?
Thanks

[cubaman]

On Jun 30, 2:50 pm, cubaman <oscar.acostamo nte...@googlema il.com>
wrote:

On Jun 28, 2:21 pm, "Mr. Arnold" <MR. Arn...@Arnold.c omwrote:

"cubaman" <oscar.acostamo nte...@googlema il.comwrote in message

news:11******** **************@ q69g2000hsb.goo glegroups.com.. .

Hello:
Im workin with an app that checks for incoming files to a given folder
using a FileSystemWatch er object. My problem is that if the file is
too big, the Created event fires before the file is completely copied
to the folder, and it result in IOException, the file is been used by
another process...
I thought that if i could get exclusive acces to the file it means
that the file is already copied in disc.
But this code is a never-ending loop. Even if i see that the file is
already copied in the folder, i can't get inUse= true. Maybe cause
FileSystemWatch er have some reference to it...
Any ideas of how to make this code works? Or how to know when the
incoming file is completely copied to destination folder?
Thank you very much!

Maybe if you know the file is of a certain size, you can check for size
limit and if it's limit, send your routine into a wait period using a
timer, maybe in the event.

I have seen one example in .Net Application Block code where the example was
using a FileWatcher and in the code it was making the FileWatcher wait.

Hello Arnold, thanks for your reply.
No, file is coming over ftp, so I dont know size. Also, windows
reserve all necesary disc space before copying the file, so it reports
real size since the begin of copy proccess.
I also tried to read attributes, but file is no readonly while copy is
in process, as it shoul be...
Any other sugestion?
Thanks

Well, I'll reply to myself, in case it may be usefull for someone
else. The only solution I got was using windows api. Here is the code:

using System;
using System.Runtime. InteropServices ;

namespace CampaignReceive rService {
public static class NativeMethods {
private const uint GENERIC_WRITE = 0x40000000;
private const uint OPEN_EXISTING = 3;

[DllImport("kern el32.dll", SetLastError = true)]
private static extern IntPtr CreateFile(stri ng lpFileName,
uint dwDesiredAccess ,
uint dwShareMode,
IntPtr
lpSecurityAttri butes,
uint
dwCreationDispo sition,
uint
dwFlagsAndAttri butes,
IntPtr hTemplateFile);

[DllImport("kern el32.dll", SetLastError = true)]
[return : MarshalAs(Unman agedType.Bool)]
private static extern bool CloseHandle(Int Ptr hObject);
public static bool IsFileInUse(str ing path) {
IntPtr fileHandle;
fileHandle = CreateFile(path , GENERIC_WRITE, 0,
IntPtr.Zero, OPEN_EXISTING, 0, IntPtr.Zero);
if (fileHandle.ToI nt32() == -1) {
return true;
}
else {
CloseHandle(fil eHandle);
return false;
}
}
}
}

Best regards.

Oscar Acosta
mcad