C# Discussion Boards - CodeProject

29-Sep-05 5:54

I doubt that code even compiles, use of uninitialized variable 'str'... D'Oh! | :doh:

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Re: Binary File

Guffa29-Sep-05 7:01

Guffa

29-Sep-05 7:01

You can't read a binary file as text. Read it as bytes instead.

---
b { font-weight: normal; }

Re: Binary File

29-Sep-05 11:01

To read a binary as an array of bytes (with a lot of help from turbochimp):

using System.IO;

byte[] buffer = null;
Stream file = new FileStream(@"C:\myfile.bin", FileMode.Open, FileAccess.Read);
buffer = new byte[file.Length];
file.Read(buffer, 0, (int)file.Length);
file.Close();

Now, all the file contents are in "buffer" and you can work with it.

Hope it helps you.

Vector Graphics

pmasknguyen29-Sep-05 5:48

pmasknguyen

29-Sep-05 5:48

Where i can find any information about creating a vector drawing software, about technical, and algorithm?. Thank you very much

Nothing

Re: Vector Graphics

leppie29-Sep-05 5:56

(Xml) deserializing objects from dynamic assemblies.

29-Sep-05 5:56

I have seen a few articles on CP touching that subject. Bets bet is too look at some opensource project to get some ideas where to start. Drawing vectors are pretty easy though in .NET. Smile | :)

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Re: Vector Graphics

pmasknguyen29-Sep-05 13:48

pmasknguyen

29-Sep-05 13:48

I think it hard to catch the events of line, rectangle,... Do you know any project about it?

Nothing

-- modified at 19:52 Thursday 29th September, 2005

Rein_Petersen29-Sep-05 5:46

Rein_Petersen

29-Sep-05 5:46

Hi All,

I'm totally stymied trying to deserialize an xml document to an object that I created in a dynamic assembly:

exception:
"Unable to generate a serializer for type Person from assembly <unknown> because the assembly may be dynamic. Save the assembly and load it from disk to use it with XmlSerialization."

Before I post a pile of code, I hoped someone might have an insight to this problem. I have tried saving the assembly to disk, then reloading it using System.AppDomain.Load(byte[] rawAssembly,byte[] rawSymbolStore) from reading the dynamic dll and pdb from disk...

Everything works (the assembly is loaded and the types I defined dynamically can be reflected) until I get to the point of declaring the xml serializer for my type...

Arg. Help.

Rein

Re: (Xml) deserializing objects from dynamic assemblies.

leppie29-Sep-05 5:52

Re: (Xml) deserializing objects from dynamic assemblies.

29-Sep-05 5:52

You cant use Load(byte[]). use LoadFile() . XML serializer is extremely weak and picky and generally full of @#$@ Smile | :)

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Rein_Petersen29-Sep-05 6:49

Rein_Petersen

29-Sep-05 6:49

There is hope Smile | :)

Alas, loading a string AssemblyName raises this exception:

"The located assembly's manifest definition with name 'DynMod' does not match the assembly reference."

What do you suppose I am missing?

Rein

Re: (Xml) deserializing objects from dynamic assemblies.

Rein_Petersen29-Sep-05 7:54

Rein_Petersen

29-Sep-05 7:54

ooops,

disregard that... was using a different name for the assembly than the module. They're the same name now and the error is gone.

Thanks again,

Rein

SecurityException Question

PULLAH29-Sep-05 5:28

PULLAH

29-Sep-05 5:28

typical story, new to c# and got a, probably stupid, question!

I am trying to compile the code at http://www.codeproject.com/dotnet/pinvokeaddshare.asp

Its intended to create a file share.

When I run the code it throws a System.Security.SecurityException.

I put the responcible line in a try | catch block, just in case it was a problem with the code and checked exceptions.

I examined the code and the return from the method called in the erroring line returns a status code which says that the share was created but it was not.

I am an admin of the locel machine, which is where I am creating the share.

What I am thinking now is that Visual Studio executes code in a sandbox kind of arrangement and a security level has to be specified for executing code!!! does this feature exsits?

Any ideas?

Thanks

Re: SecurityException Question

leppie29-Sep-05 5:40

SecurityException Question

29-Sep-05 5:40

PULLAH wrote:
What I am thinking now is that Visual Studio executes code in a sandbox kind of arrangement and a security level has to be specified for executing code!!! does this feature exsits?

No it does not, check your code, you probably have a problem with one of your parameters for the pinvoke function.

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PULLAH29-Sep-05 5:28

PULLAH

29-Sep-05 5:28

is there a reverse of @"abc"?

Ariadne29-Sep-05 5:27

Ariadne

29-Sep-05 5:27

Hi if I read command line args I get results of @"line\nline2"
how can I convert this into "line1\nline2"?

In other words: how to remove the '@'?

Ariadne

leppie29-Sep-05 5:36

29-Sep-05 5:36

They are the same thing, the @ only defines different escaping routines. Smile | :)

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Ariadne29-Sep-05 5:49

Ariadne

29-Sep-05 5:49

leppie wrote:
They are the same thing, the @ only defines different escaping routines.

ok, but how can I change the escaping routine.
if I do: sPrompt=args[i] and args[i] contains a '\' the real string of sPrompt is something like: @"...\...", but I want show this prompt in MessagBox without this '@' escape function. ie. I want show more than one line, if I get in args[i] a '\n'
thanks!

Ariadne

leppie29-Sep-05 6:05

29-Sep-05 6:05

You will need to do a str.Replace(@"\n","\n") :->

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Luis Alonso Ramos29-Sep-05 17:34

Luis Alonso Ramos

29-Sep-05 17:34

The escaping routine is for the compiler, and not for the string itself.

If you do Console.WriteLine("line1\\nline2") or Console.WriteLine(@"line1\nline2"), you'll get the same output:

line1\nline2

In the first case, to insert a backslash in the string, you need to double it (otherwise it will be interpreted as a special character: eg. \n as newline). In the second example, the @ means that a different escaping will be performed (most special characters won't be escaped) so \n produces exactly that, \n.

The @ makes a difference when specifying paths in code:

string path1 = "C:\\Program Files\\Microsoft";
string path2 = @"C:\Program Files\Microsoft";

In memory, both path1 and path2 will contain exactly the same.

If you read the string from anywhere typed by the user, you don't have to worry about escape characters. If he types one backslash, you'll get it. Escaping is only when specifying strings in code.

-- LuisR

Luis Alonso Ramos
Intelectix - Chihuahua, Mexico

Not much here: My CP Blog!

The amount of sleep the average person needs is five more minutes. -- Vikram A Punathambekar, Aug. 11, 2005

Ariadne29-Sep-05 20:07

Ariadne

29-Sep-05 20:07

Luis Alonso Ramos wrote:
The escaping routine is for the compiler, and not for the string itself.

no, I think not, because I get the '@'-problem at runtime.
but I'm happy leppie solved the problem with

sPrompt=sPrompt.Replace(@"\n","\n");

It works!

Thanks leppie

Ariadne

.Net Client app holding socket...

Luis Alonso Ramos30-Sep-05 8:33

Luis Alonso Ramos

30-Sep-05 8:33

What that particular line of code is doing is replacing the characters \n (backslash followed by an n) with an actual newline character. It is the exact equivalent of: sPrompt = sPrompt.Replace("\\n", "\n").

Somehow you read the sPrompt string from somewhere that doesn't support escaping of characters (a resource maybe?) so you ended up with the characters '\' and 'n' in memory, instead of the actual newline (char 13) character.

But the escaping only works when specifying strings by code, and it's performed by the compiler.

-- LuisR

Luis Alonso Ramos
Intelectix - Chihuahua, Mexico

Not much here: My CP Blog!

The amount of sleep the average person needs is five more minutes. -- Vikram A Punathambekar, Aug. 11, 2005

Jason Weibel29-Sep-05 4:40

Jason Weibel

29-Sep-05 4:40

I have a .net windows client application that queries a .net web service. After the client has called the web service if netstat is run from the command line the results will show 10 sockets still open. Below is the code from my client app. My questions are
1. Why does the client app need 10 sockets?
2. What can I do to force the closing of the sockets since the GC.Collect() & GC.WaitForPendingFinalizers() methods don't seem to be doing it?
3. Does it really matter if the sockets are not immediately closed?

Private Sub LogIn()<br />
    If IsUserOffLine() Then Exit Sub<br />
    Dim wsEmpInfo As EmpInfoWS.EmployeeInformation = BF.SetUpWS()<br />
  Try<br />
    wsEmpInfo.SetEmployeeCheckIn(BF.GetUserName, txtLogInComments.Text)<br />
  Catch Ex As Exception<br />
    Call IsUserOffLine()<br />
  Finally<br />
    wsEmpInfo.Dispose()<br />
  End Try<br />
    Dim tRefreshForm As New Thread(New ThreadStart(AddressOf RefreshForm))<br />
  Try<br />
    tRefreshForm.Start()<br />
  Catch ex As Exception<br />
    tRefreshForm = Nothing<br />
  End Try<br />
  End Sub<br />
  <br />
  Private Sub RefreshForm()<br />
  Try<br />
    Call PopulateForm()<br />
    Call HandleNotify()<br />
    Call ShowScrollingNote()<br />
    Call CleanUp()<br />
  Catch<br />
  End Try<br />
  End Sub<br />
  <br />
  Private Sub CleanUp()<br />
  Try<br />
    GC.Collect()<br />
    GC.WaitForPendingFinalizers()<br />
  Catch<br />
  End Try<br />
  End Sub

I appreciate any suggesting you have, thank you.

Jason W.

Stefan Troschuetz29-Sep-05 4:59

Stefan Troschuetz

29-Sep-05 4:59

It would be very useful to provide the code where you actually call the web service.

www.troschuetz.de

Jason Weibel29-Sep-05 5:04

Jason Weibel

29-Sep-05 5:04

Not sure if this helps but it's worth a try.

<br />
    Public Function SetUpWS() As EmpInfoWS.EmployeeInformation<br />
      Dim wsEmpInfo As New EmpInfoWS.EmployeeInformation<br />
      wsEmpInfo.Url = GetEmpInfoWSURL()<br />
      wsEmpInfo.Credentials = System.Net.CredentialCache.DefaultCredentials<br />
      Return wsEmpInfo<br />
    End Function<br />

Jason W.

leppie29-Sep-05 5:23

29-Sep-05 5:23

was is the actual state of the connection? its probably in a PENDING_CLOSE state (or something like that).

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