How to find the current user domain - C# Discussion Boards

FileSystemWatcher vs. Own file system polling

C-Scharbe19-Nov-07 2:42

19-Nov-07 2:42

Can any body tell me the advantages and disadvantages of both kinds to get to know if a file is in a specified directory.

I have a directory in the network and a application that should work with the file took into the directory.

I try to do it with a FileSystemWatcher, but the problem is, if the network connection failed, the FileSystemWatcher did'nt react if the network directory is already available.
So i need to reinitialize the FileSystemWatcher in a while again.

But i also heard to poll the file system isn't a good idea because it slows the cpu down.
(Is it more than the FileSystemWatcher? Can anybody suggest (a good loop time for) polling?)

Thank You for your suggestions...

Re: FileSystemWatcher vs. Own file system polling

jmhamm19-Nov-07 5:05

jmhamm

19-Nov-07 5:05

You could create a thread, spins in a loop and reinitializes the FileSystemWatcher from time to time using Thread.Sleep in between. As FileSystemWatcher uses events this would effectively create a mix of polling and signaling.

Re: FileSystemWatcher vs. Own file system polling

C-Scharbe19-Nov-07 5:10

C-Scharbe

19-Nov-07 5:10

Yes i already do so, but i think: 'is this mix good?', isn't it better only to poll the file system instead using the file system watcher?

Re: FileSystemWatcher vs. Own file system polling

jmhamm19-Nov-07 5:28

jmhamm

19-Nov-07 5:28

I would think this is ok, and you can decide how often you poll, just don't do it all the time. You may use a flag for poll-only mode which reduces the polling period and disables the FileSystemWatcher, which would make it kind of universal. You could even call the same callback.

Re: FileSystemWatcher vs. Own file system polling

mav.northwind19-Nov-07 5:12

mav.northwind

19-Nov-07 5:12

Another downside of the FSW is that it can only be used with NTFS filesystems (FAT may be possible as well, don't know 100%). So if you're trying to watch a file on a SMB share you won't get any events.

Regards,
mav

--
Black holes are the places where God divided by 0...

Re: Marshell.sizeof exception

Pete O'Hanlon19-Nov-07 2:37

Pete O'Hanlon

19-Nov-07 2:37

Why not use a PrintDialog (the WinForms one) instead? With this, you don't have to use P/Invoke for anything.

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INBOUND XML

kibromg19-Nov-07 2:13

kibromg

19-Nov-07 2:13

Hi all,

Can any one help me out if my application's code is correct to read an Inbound Xml file pointing to my application from another platform API's.

Here is the code in the page_load event.

protected void Page_Load(object sender, EventArgs e)
{
string xml = Request.Form["XML"];

DateTime dateNow = DateTime.Parse(DateTime.Now.ToString());
string contentName = dateNow.ToString("yyyyMMddhhmmsstt");
string dateOnly = dateNow.ToString("yyyyMMdd");
string hourOnly = dateNow.ToString("HHtt");

string path = Server.MapPath("./text/revers.xml");
string billingMsg = "Thank you for you message. You have been .";
string username = "test";
string password = "test";
string xmlOut = string.Empty;

if (!string.IsNullOrEmpty(xml))
{
int DbPosition = GetNextId();
ProcessMoMms(xml, path, contentName, billingMsg, username, password, DbPosition, dateOnly, hourOnly);
xmlOut = GetXmlString(path);
xmlOut = HttpPost("http://gateway.input.com/MtReceiver", xmlOut);
Response.Write("OK");
Response.End();

}
else
Response.Write("The post field xml has not been defined.");
}
}

How to find the current user domain

NK719-Nov-07 1:54

NK7

19-Nov-07 1:54

Hi

Can any one help me to find the current user domain.

I am using the follwing code:

WindowsIdentity wIdentity= WindowsIdentity.GetCurrent();

Its listing only the current system connected domain.

For ex:

I belongs to domain retail, if i log in using my userid and domain("retail") from other machine belongs to other domain, its giving that system domain instead of my domain. Help me please.

kesavan

Re: How to find the current user domain

originSH19-Nov-07 2:18

originSH

19-Nov-07 2:18

What is this for? ASP.Net or something else?

FOr ASP.Net the code you have there is correct, if it's giving you the wrong results then you probably don't have impersonation setup correctly.

If it's for something else then check out the System.Environment[^] class.

Dynamically create table

markymark8219-Nov-07 1:37

markymark82

19-Nov-07 1:37

I am tring to create a series of dynamic tables using c# .net

I can add rows and data to a table already created in my aspx page but as soon as I try and create a new table I get nothing. I know this is down to me not doing something but I can't seem to find out what. Here is my basic code, it is only for one table, but that will be changed once I can display this one:

Table testTbl = new Table();
testTbl.ID = "testTbleID";
TableRow testTblRow = new TableRow();
TableCell testTblCell = new TableCell();
TableRow testTblRow1 = new TableRow();
TableCell testTblCell1 = new TableCell();

testTblCell.Text = "Hello World!!";
testTblRow.Cells.Add(testTblCell);
testTbl.Rows.Add(testTblRow);

testTblCell1.Text = "Hello Again World!!";
testTblRow1.Cells.Add(testTblCell1);
testTbl.Rows.Add(testTblRow1);

What do I have to do to get the table to write on the page? I know it is created as I can response.write the number of rows in it?

any help would be appreciated, I know it's something simple, it always is!

Thanks in advance

mark

Re: Dynamically create table

Satish - Developer19-Nov-07 1:41

Satish - Developer

19-Nov-07 1:41

Take Literal control

Literal lit = new Literal();

lit.Controls.Add(testTbl);

Try this..........

Re: Dynamically create table

markymark8219-Nov-07 1:57

markymark82

19-Nov-07 1:57

Satish,

Thanks for your reply, I can see where you're coming from I think, but I just get the following error?

Exception Details: System.Web.HttpException: 'System.Web.UI.WebControls.Literal' does not allow child controls.

I tried LiteralControl aswell but got the same error?

Is this the only way to do it?

thanks again

Re: Dynamically create table

Malcolm Smart19-Nov-07 2:01

Malcolm Smart

19-Nov-07 2:01

You need to add the table to your page's controls collection.

form1.Controls.Add(testTbl );

'form1' can be the pages Form, or you can use a Panel or PlaceHolder.

"More functions should disregard input values and just return 12. It would make life easier." - comment posted on WTF

"This time yesterday, I still had 24 hours to meet the deadline I've just missed today."

Re: Dynamically create table

markymark8219-Nov-07 2:06

markymark82

19-Nov-07 2:06

that was perfect!!
thank you soo much, I could have done with that ages ago for other things, as I actually wanted to add the table to a panel, I just replace form name with panel name.

Thanks again

mark

howto check a directory periodically

stephan_00719-Nov-07 0:31

stephan_007

19-Nov-07 0:31

hi everyone!

i do have a consol application which will be changed to a service.
i do want the application to check a folder periodically, if there are (new) files in it. if so, then the application does it's duty, if there is nothing (new) then it does nothing.

i am not sure how to do this. first i thought to do it with an endless loop (e.g. while(true)) but will this terminate without an exception when the service is shotdown?

does anyone of you have an idea?
simply checking for an empty folder won't help, because the folder could be empty for some amount of time. so it has to be something like

<br />
while (service_active)<br />
{<br />
  Filelist = Directory.GetFiles(sourcepath, searchpattern);<br />
  if Filelist.Length > 0<br />
  {<br />
    // handle input from file(s) else do nothing<br />
  }<br />
}<br />

does anyone of you have an idea how to do this?

thanks.
stephan.

Re: howto check a directory periodically

Vasudevan Deepak Kumar19-Nov-07 0:39

Vasudevan Deepak Kumar

19-Nov-07 0:39

stephan_007 wrote:
if there are (new) files in it

Did you consider a FileSystemWatcher based implementation?

Vasudevan Deepak Kumar
Personal Homepage
Tech Gossips

Yesterday is a canceled check. Tomorrow is a promissory note. Today is the ready cash. USE IT.

Re: howto check a directory periodically

pmarfleet19-Nov-07 0:40

pmarfleet

19-Nov-07 0:40

Use the FileSystemWatcher[^] class.

Paul Marfleet

"No, his mind is not for rent
To any God or government"
Tom Sawyer - Rush

Re: howto check a directory periodically

stephan_00719-Nov-07 1:15

stephan_007

19-Nov-07 1:15

thanks for the hint. but i might have encountered a new problem:

my program (service in the end) checks for files in a folder as long as it is terminated. to start the programm is simple, because i do only have to add the lines of code from my console program to the onstart section.

but what happens, when i stop the service? does it through an exception when the operation is still active? or what do i have to do/implement in the onstop section to let it terminate correctly? do i have to code threads or is there a chance to tell c# to wait until the current operation (periodically check for new files in folder) is finished and shutdown afterwards?

Re: howto check a directory periodically

pmarfleet19-Nov-07 3:09

pmarfleet

19-Nov-07 3:09

When the service is stopped/paused, set the EnableRaisingEvents property of the FileSystemWatcher to false. The component will no longer react to file/directory changes. When the service is started/resumed, set the property back to true.

Paul Marfleet

"No, his mind is not for rent
To any God or government"
Tom Sawyer - Rush

Re: howto check a directory periodically

stephan_00719-Nov-07 2:12

stephan_007

19-Nov-07 2:12

thanks for this hint.

i am still wondering if i want to check the directory lets say every 10 sec or lets say every 1 min if this won't consume system resources. because when i do a
while ((lastwatch - now) < 60 secs))
{
// do nothing and wait
}

this consumes systemresources. i think it would be a better solution to send the service to sleep until the new check of the folder. in delphi there is a sleep() function. but is there anything similar in c#? because if there is then i would do the following:

1) sleep for 10 secs, 30 secs or how long ever
2) check directory for files
3) do the operation

and then start at 1 again until the service is stopped.

so is there something similar in c# like sleep() in delphi? because i do want the service to be inactive for some amount of time, check for new files after this time of inactivity and then go back to sleep afterwards.

thanks.

stephan.

Re: howto check a directory periodically

stephan_00719-Nov-07 4:43

stephan_007

19-Nov-07 4:43

this helped me a lot. but i encountered a new problem: when the file enters the directory which is watched and is still locked by the system copy handler, the file can't be accessed.

e.g. the program watches the directory "watchdir". lets say i copy a file to this directory, then the eventhandler fires already before the file is propperly written to this folder.

this happens, when the program accesses the file which is just copied.

do you have an idea how to handle this? should i delay until it is written?? but in the beginning i do not know how long this will take.
this situation does not occure when there are more files and the file, which is sorted at the top is not the first one handled. meaning lets say, we do have file a and file b. if file b is the last one being written, then there is no problem, if it is file a which is written as the last file, then it is still logged and can't be accessed.

the best solution would be to either ignore or try again some ms later. but what if there is a new file which is sorted before this file. then we have to wait again.

so lets say i do copy the file "file123" then it is accessed at once but might still be protected by the copy handler of windows.
in case of more than one file, if the first file after sorting is accessed then it is the same situation like above, otherwise the error doesn't occure.

any ideas?

Re: howto check a directory periodically

Luc Pattyn19-Nov-07 1:46

Luc Pattyn

19-Nov-07 1:46

Have a look at SystemEvents.SessionEnding

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search a word

RajeevKumarSharma19-Nov-07 0:21

RajeevKumarSharma

19-Nov-07 0:21

hi i want to search a word from a textfile and save that in a excel sheet

rajeev kumar sharma
vri software pvt. ltd.
new delhi India

Re: search a word

Sun Rays19-Nov-07 0:30

Sun Rays

19-Nov-07 0:30

Hi,

Chekc this.

 public static bool SearchWord(string word)<br />
 {<br />
   StreamReader re = File.OpenText("test.txt");<br />
   string input = null;<br />
   while ((input = re.ReadLine()) != null)<br />
   {<br />
     if(input.indexOf(word,0)>0)<br />
     {<br />
      re.close;<br />
      return true;<br />
      }<br />
   }<br />
   re.close;<br />
   return false;<br />
 }<br />
<br />

Thanks,
Sun Rays

Rate this post if you like answer.

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Re: search a word

Satish - Developer19-Nov-07 1:47

Satish - Developer

19-Nov-07 1:47

I think u get the data easily form text file.

After getting data from Excel file, u can write in to Excel file

U have to see the following links. Go through this. It may help you a lot.

http://www.codeproject.com/useritems/Write_Data_to_Excel_using.asp

http://www.developerfusion.co.uk/forums/p/29795/109392/

http://support.microsoft.com/kb/306023

G. Satish

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