Re: FileSystemWatcher won't work with IIS Log Files - C# Discussion Boards

leppie6-Jan-03 11:44

leppie

6-Jan-03 11:44

Hi
I was wondering if there is a limit how deep one can recurse in a function. I have this program that goes about 2048 (coincidence, i think not) and the function just returns. Could it be it?

Also VS.NET doesnt seem to report the correct return value from the main method.

Thanx Smile | :)

WebBoxes - Yet another collapsable control, but it relies on a "graphics server" for dynamic pretty rounded corners, cool arrows and unlimited font support.

Re: Recursive limit?

Andres Manggini6-Jan-03 12:01

Andres Manggini

6-Jan-03 12:01

I guess that would be the stack size limit.

Andres Manggini.
Buenos Aires - Argentina.

Re: Recursive limit?

leppie6-Jan-03 19:41

leppie

6-Jan-03 19:41

That seems to be true. I rewrote it to run in a while loop and have had no problems Smile | :)

But what if you cant do what I did, what then?

WebBoxes - Yet another collapsable control, but it relies on a "graphics server" for dynamic pretty rounded corners, cool arrows and unlimited font support.

Re: Recursive limit?

Andres Manggini7-Jan-03 7:17

Andres Manggini

7-Jan-03 7:17

Well, you could increase the size of the stack, don't know what the limit is with .NET, on the other hand, I never came across a recursive function *that* recursive Smile | :)

And remember that there is always a perfomance hit on each function call.

Andres Manggini.
Buenos Aires - Argentina.

Re: Recursive limit?

leppie7-Jan-03 7:44

leppie

7-Jan-03 7:44

Andres Manggini wrote:
I never came across a recursive function *that* recursive

I think it was just a matter of me doing going the quickest route before thinking. Thinking now, running in a while(true) loop is the much better option. Maybe a recursive function should never be than deep.

Andres Manggini wrote:
And remember that there is always a perfomance hit on each function call.

What do you mean by that? I have seen no difference between running it in a while(true) loop vs a recursive function.

WebBoxes - Yet another collapsable control, but it relies on a "graphics server" for dynamic pretty rounded corners, cool arrows and unlimited font support.

Re: Recursive limit?

Andres Manggini7-Jan-03 8:50

Andres Manggini

7-Jan-03 8:50

leppie wrote:
What do you mean by that? I have seen no difference between running it in a while(true) loop vs a recursive function.

Yes, the difference is very small, you should measure it in millisecons.
Every recursion makes a call to a function, there's a small penalty there. If you are using a virtual method is a little bit bigger (big as in really small Smile | :)

)

Andres Manggini.
Buenos Aires - Argentina.

FileSystemWatcher won't work with IIS Log Files

Steve Cox6-Jan-03 10:42

Steve Cox

6-Jan-03 10:42

Problem:
I can't seem to catch any file or directory activity events for IIS's log files.

I have seen this problem behavior before with both NT Shell Hooks and .Net FileSystemWatcher code (which I assume is basically hooking into the same NT event mechanisum)

Basically, I want to "scan" IIS logfile activity whenever a website is browsed.
I could use ISAPI filters but really wanted to just be "alerted" each time someone
hit's the site using FileSystemWatcher code.

But it don't work. How can one "watch" an (I assume) in memory file ???

Any ideas ???

Re: FileSystemWatcher won't work with IIS Log Files

Heath Stewart7-Jan-03 3:16

Heath Stewart

7-Jan-03 3:16

This isn't the right way to do this for so many reasons.

First, because IIS writes logs to memory and batches a write operation from time to time (for which the actual file doesn't often change because enough space is allocated for several batch writes).

Second, you're right: ISAPI is a better solution; however, if you are interested in ASP.NET pages (after all, do you really want to know each request for an image, "robots.txt", "favicon.ico", etc.?), you can easily write an IHttpHandler that will write a custom log for you somewhere or use remoting to update a chart in a different application.

There is yet another option that already exists and one which you could extend: performance counters. If you look in your Computer Management MMC snap-in (right-click on "My Computer" and select "Manage..." for easy access), you'll see an extension for logs. You could start by creating your own log file there for this specific purpose. You can also see this in "perfmon.exe" for which you can setup new counters. The .NET Framework has good support for counters, too, so you can take advantage of the file in many ways.

Third, as I touched upon before, you don't want to be notified for requests to things like "robots.txt", "favicon.ico", and all the various spiders do you? If you're interested in legitimate hits to your *pages*, the IIS log will never tell you that unless you plan on parsing a very large file yourself every time it changes.

"Well, I wouldn't say I've been missing it, Bob." - Peter Gibbons

Re: FileSystemWatcher won't work with IIS Log Files

Steve Cox7-Jan-03 4:04

Steve Cox

7-Jan-03 4:04

Thanks for your input.

I didn't think of the PerfMon approach which seems to be as un-intrusive as one could
get which is what I was shooting for.

I will try out your suggestion.

Thanks again for your time.

Steve Cox

FileSystemWatcher won't work with IIS Log Files

Steve Cox6-Jan-03 10:42

Steve Cox

6-Jan-03 10:42

Equivalent of Java's <code>instanceof</code> in C#

Le centriste6-Jan-03 9:46

Le centriste

6-Jan-03 9:46

In Java, you can say:

if (obj instanceof java.lang.String)
{
    //...
}

What is the C# equivalent, if any?

Re: Equivalent of Java's <code>instanceof</code> in C#

Nemanja Trifunovic6-Jan-03 10:04

Nemanja Trifunovic

6-Jan-03 10:04

if (obj is String)

Beer | [beer]

Re: Equivalent of Java's <code>instanceof</code> in C#

Rob Graham6-Jan-03 10:17

Rob Graham

6-Jan-03 10:17

(o.GetType().Equals(typeof(System.String))) for exact type equality.
(o is System.String) will also return true if o can be explicitly cast to String ...

Some ideas are so stupid that only an intellectual could have thought of them - George Orwell

Re: Equivalent of Java's <code>instanceof</code> in C#

James T. Johnson6-Jan-03 10:19

James T. Johnson

6-Jan-03 10:19

As Nnamdi said, use the is keyword; but if you are just going to turn around and cast it, you should use as instead. as will do the cast and if it isn't of the correct type it will return null and you can check for that instead.

string str = obj as string;
if( str != null )
{ 
  // use str
}
else
{
  // obj is not a string
}

HTH,

James

"It is self repeating, of unknown pattern"
Data - Star Trek: The Next Generation

Thanks for your answers!

Le centriste6-Jan-03 15:30

Le centriste

6-Jan-03 15:30

COM Exception

Lmani6-Jan-03 9:45

Lmani

6-Jan-03 9:45

I put internet Exporer in a UserControl derived class and added this control to a form. When the form initializes at startup I get the following exception:

A first chance exception of type 'System.Runtime.InteropServices.COMException' occurred in system.windows.forms.dll

When a similar standalone application is created,the code runs fine.WHat might be the problem..Can anyone provide a solution?

Mani

toolwindow w/o focus

Roger Alsing6-Jan-03 8:06

Roger Alsing

6-Jan-03 8:06

Hi , any idea how to make a toolwindow not steal focus from the parent form?
what i mean is , when i show my window , i dont want it to gray-out the parents wnds caption.

ive tried to simple reset focus to the parent when i click something on the tooltip , but that makes the parent flicker.

ive tried to just dispose the wm_activate message in the wndproc , no luck there either (for some reason the parents caption dissappeared (??))

ive also tried to apply various styles to the window , like:

this.CreateParams.ClassName ="tooltips_class32";
this.CreateParams.Style=TTS_ALWAYSTIP | TTS_NOPREFIX | WS_POPUP;
this.CreateParams.Parent =ParentControl.Handle;

no luck there either...

any ideas??

//Roger

FileSystemWatcher Question

OBRon6-Jan-03 7:53

OBRon

6-Jan-03 7:53

I admit I haven't done my homework here, but I need to have my application process files after they show up in a directory. The FileSystemWatcher seems like the perfect object to use. When I plug this guy in and add handlers for the FileCreated and FileChanged events, I catch 4 events for every file I copy into my directory; 1 file created and 3 file changed events (this is XP Pro). Is there a simple way to make this object give me 1 notification that a file has been copied and fully written to my directory? I really don't want to have to keep track of waiting for the 4th event. Thanks.

Ron

Re: FileSystemWatcher Question

Eric Gunnerson (msft)6-Jan-03 13:26

Eric Gunnerson (msft)

6-Jan-03 13:26

That's basically the way the underlying Win32 function works.

One common approach is to try to open the file - it will be there and accessible when you can open it.

Problems with SQL database connection string

Member 29074626-Jan-03 7:34

Member 2907462

6-Jan-03 7:34

Can anyone help me understand why this connection string is not working. I have the following piece of code

string connString = "user id=sa;password=;initial catalog=dbName;data source=Test;Connect Timeout=30";
SqlConnection connect = new SqlConnection(connString);

try
{
connect.Open();
.....}
catch
{
...
}

It gives me the error "SQL server does not exist or access denied." The datasource is correct and tests out correctly in the ODBC administrator. It does not matter what database name I put in there. Another interresting thing, If I change the connection string and eliminate the data source completely it give me the error
"Login failed for user "sa" Not associated with a trusted SQL server connection" I have used the ODBC connection and database in my C++ application and they work just fine. Any ideas why C# is causing me such a headache? Thanks for any help.

Re: Problems with SQL database connection string

OBRon6-Jan-03 7:42

OBRon

6-Jan-03 7:42

I believe the SqlConnection object is not an ODBC object, but a native SQL Server connection. So your data source needs to be the IP Address of your server or the DNS server name, rather than an ODBC data source name.

Ron Ward

Re: Problems with SQL database connection string

Paul Riley6-Jan-03 10:25

Paul Riley

6-Jan-03 10:25

Try ODBC.NET[^] and a connection string like "DSN=Test;".

Paul
Pleasently caving in, I come undone - Queens of the Stone Age, No One Knows

Re: Problems with SQL database connection string

Richard Deeming7-Jan-03 0:40

Richard Deeming

7-Jan-03 0:40

Check that the server "Test" is running, and that you can see it from your machine;
Check that the server is set to allow SQL Server authentication - the default settings only allow Windows authentication;
1. If your server is set to Windows authentication, change the connection to:
```
initial catalog=dbName;data source=Test;Connect Timeout=30;Integrated Security=True;
```
2. If the server allows SQL authentication, check the password for sa - if it really is blank, you should set it immediately!

"These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer

Re: Problems with SQL database connection string

Steve McLenithan7-Jan-03 4:48

Steve McLenithan

7-Jan-03 4:48

http://www.connectionstrings.com/[^]

Big Grin | :-D

********************
* $TeVe McLeNiThAn
********************

IntPtr to a structure

Nnamdi Onyeyiri6-Jan-03 6:32

Nnamdi Onyeyiri

6-Jan-03 6:32

I have an IntPtr that points to an unmanaged structure. How would I retrieve the information from this structure?

[edit]

actually, im not sure it is a stucture, not sure what it is, but information on what the IntPtr is leading to is here.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/userinput/keyboardinput/aboutkeyboardinput.asp
[/edit]

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