C# Discussion Boards - CodeProject

Running application on a network mapped drive

10-May-09 22:30

I use CITRIX[^] for that.

Navaneeth

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Matjaz-xyz10-May-09 21:35

Matjaz-xyz

10-May-09 21:35

Hi. If i try to run my applications on a mapped drive i get a security warning in the top left corner of the applications window. And apllication doesn't work as it gives me an information window : "Application attempted to perform an operation not allowed by the security policy.
...
Request for the permission of type 'System.Security.Permissions.FileIOPPermission, mscorlib, version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'

How can i make my applications work in such an envirioment? I've seen normal delphi apps work Smile | :)

Thanks in advance!

Regards,
Matjaž

N a v a n e e t h10-May-09 22:35

10-May-09 22:35

It is because of the code access security. Read about Caspol.exe[^]. This[^] blog post can also help.

Smile | :)

Navaneeth

How to use google | Ask smart questions

Matjaz-xyz10-May-09 22:48

Matjaz-xyz

10-May-09 22:48

Thanks for your answer!
So that means there's no way to get applications running by adding some extra code?
Only localy with administrator account and change some settings?

Regards,
Matjaž

N a v a n e e t h10-May-09 22:58

10-May-09 22:58

Matjaž Grahek wrote:
So that means there's no way to get applications running by adding some extra code?

I am not sure, but I think there is no other way.

Navaneeth

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Eddy Vluggen11-May-09 0:01

11-May-09 0:01

It wouldn't be providing much security if you could simply bypass it.. D'Oh! | :doh:

I are troll Smile | :)

XML Serializing an Object that Inherits a List of itself

Matjaz-xyz11-May-09 21:25

Matjaz-xyz

11-May-09 21:25

hehehe

true

well... thanks anyway Smile | :)

Regards,
Matjaž

Patricker10-May-09 21:35

Patricker

10-May-09 21:35

I have an object, called Tag, which inherits List<Tag>.   This works great code wise, I can add objects of type tag to my tag without issue.   But when I try to serialize the object to XML it crashes with a "An unhandled exception of type 'System.StackOverflowException' occurred in System.Xml.dll" error when I try to initialize a new instances the XmlSerializer class, and pass in the type of Tag.

If I remove the Inherts List<Tag> and just create a new property of type List<Tag> instead, then this serializes great, but does not give me quite the appearance I want.   Is there someway to make this work without custom serialization, or maybe only minor custom serialization?

Thanks,
   Peter

Re: XML Serializing an Object that Inherits a List of itself

Webnoi29-Jun-09 10:54

Webnoi

29-Jun-09 10:54

Im having the same issue. Have you found the solution?

Re: XML Serializing an Object that Inherits a List of itself

Patricker29-Jun-09 13:33

Patricker

29-Jun-09 13:33

Nope, never did find a work around, ended up doing it a different way, can't remember exactly how right now.

Windows Service Starts multiple threads

livez10-May-09 21:25

livez

10-May-09 21:25

Hello!

I´ve created an windows service with a timer-object. My application runs a method with a given interval, which builds up strings in memory and when finished with one string sends data to our database. Problem is, my application seems to be running on several threads, which messes up the string-values I hold in memory.

I run this code in the start of the method I´ve set my timerobject to perform:

Log.Write("current threadid : " + System.Threading.Thread.CurrentThread.ManagedThreadId.ToString());

which gives me

current threadid : 4<br />
current threadid : 7<br />
current threadid : 8<br />
current threadid : 4<br />
current threadid : 7<br />
current threadid : 8<br />
current threadid : 4<br />
current threadid : 8<br />
current threadid : 7<br />
current threadid : 8

etc.

Is this how windows services work, and can I manage this behaviour somehow?

Re: Windows Service Starts multiple threads

N a v a n e e t h10-May-09 22:55

Re: Windows Service Starts multiple threads

10-May-09 22:55

livez wrote:
Problem is, my application seems to be running on several threads, which messes up the string-values I hold in memory.

Problem will be with timer. You should not use a timer here. Try to run your method in a thread. You can also read Luc's article Timer surprises, and how to avoid them[^].

Navaneeth

How to use google | Ask smart questions

Nicholas Butler10-May-09 22:57

Nicholas Butler

10-May-09 22:57

I presume you are using System.Threading.Timer?

When this fires, it uses a thread from the thread pool to run your TimerCallback method. You can verify this using:

System.Threading.Thread.CurrentThread.IsThreadPoolThread

If your method takes longer to execute than the timer period, then when the timer fires again, it will run your method again ( concurrently ) on a different thread pool thread.

You have to take this into account when writing your TimerCallback method.

Nick

----------------------------------
Be excellent to each other Smile | :)

Re: Windows Service Starts multiple threads

livez10-May-09 23:00

livez

10-May-09 23:00

Thanks alot guys, u were spot on!

Searching files

Rajdeep.NET is BACK10-May-09 21:13

10-May-09 21:13

Hi friends,

I have a file called 'simple.txt' in the C:// drive, but I dont know the exact location in the drive, since there are many directories present. Now, I want to manipulate with the file, i.e., write, read, rename or delete it from the drive. Suppose, I want to delete it with this code: System.IO.File.Delete(@"C:/simple.txt");or run/open the file with this peice of code: System.Diagnostics.Process.Start(@"C:/simple.txt");. But this works, only if the file's location is C://simple.txt, not in the case of C://unknowndirectory/simple.txt. Please help me. And also tell me, if its possible to manipulate with a file without assigning its extension.

Your help will be greatly appreciated,
Rajdeep.NET

NOTE: I've posted the same question earlier also, but since I did not find any appropriate result, I had to post it again with better explanation. Sniff | :^)

Eddy Vluggen10-May-09 21:39

10-May-09 21:39

Rajdeep.NET wrote:
Suppose, I want to delete it with this code: System.IO.File.Delete(@"C:/simple.txt");

Won't work, you'll get a FileNotFoundException since the path is incorrect.

Create a method that reads all the filenames in a folder. Next, loop all those filenames to check whether "simple.txt" is among them. If the file is a folder, then call your function recursively to check those too.

It's a slow way of finding a file, but it works Smile | :)

Rajdeep.NET wrote:
And also tell me, if its possible to manipulate with a file without assigning its extension.

Can't be done, you'll need the extension. Otherwise you might accidentally delete "simple.jpg" or "simple.mp3" while you wanted to kill "simple.txt".

Good luck Smile | :)

I are troll Smile | :)

Rajdeep.NET is BACK10-May-09 21:51

10-May-09 21:51

A huge thaks to you Eddy!!!

But, since I am not that expert..... can you provide me a related link which defines this process????

Once again,
Thank you veru much,
Rajdeep.NET Big Grin | :-D

Eddy Vluggen10-May-09 22:18

10-May-09 22:18

Rajdeep.NET wrote:
But, since I am not that expert

I'm no expert either :p

Here's a small example of recursion;

void SearchRecursive(string Path)
{
  foreach(string myFile in Path)
  {
    if (myFileName == Folder)
    {
        SearchRecursive(Path + myFileName)
    }
  }
}

I are troll Smile | :)

Rajdeep.NET is BACK10-May-09 22:46

10-May-09 22:46

Eddy Vluggen wrote:
foreach(string myFile in Path)

But the problem is that, in this piece of code, I have to mention the file path name, although I am unknown about its location in the drive. Please provide me a better link.

Eddy Vluggen10-May-09 22:52

10-May-09 22:52

It's not meant as a working solution, but as a starting-point for your adventure. You don't know where the file is, so you'd better find it.

You'd have to feed the drive-root to the recursive method ("C:\") and then the method should start looking in the subdirectories on it's own - until it finds your file.

You can Google for "C# recursion files", that's what I'd do if I were to post a link. I usually choose one of the top three to post Smile | :)

Good luck

I are troll Smile | :)

Rajdeep.NET is BACK10-May-09 23:17

10-May-09 23:17

Thanks a lot for your help Eddy. Actually, I was intending to create a particular malware removal toolkit. I hope google search helps..... otherwise, God will......

Have a nice day,
Rajdeep.NET Smile | :)