Internet Connection - C# Discussion Boards

7-Dec-02 10:02

Sounds like your trying to replace the login dialog. This is intentionally difficult (near impossible) to do. NT/W2K/XP guarentees that when you type Ctrl+Alt+Delete, the dialog is the trusted login dialog, and not something that might steal your password.

If you want auto-login, there is a registry setting that lets you specify a username and password. I'd only reccomend using this if the machine is in a physcially secure location.

Burt Harris

Custom TextBox Drawing

mikasa7-Dec-02 8:13

Re: Custom TextBox Drawing

7-Dec-02 8:13

I am trying to do some Custom Drawing within the TextBox in .NET. I have finally figured out how to do it and the gradient Background / ForeColors look great! However, there is a big drawback. It seems that when the TextBox receives focus, for some reason it makes the Text twice the size (from 8pt to 16pt)! WTF | :WTF:

Would anyone know why this is happening? I can't really post the Source Code because there is a lot! I am Deriving from the TextBox and Setting the Styles on it to:

SetStyle(ControlStyles.UserPaint, True)
SetStyle(ControlStyles.ResizeRedraw, True)
SetStyle(ControlStyles.DoubleBuffer, True)
SetStyle(ControlStyles.AllPaintingInWmPaint, True)

The TextBox then handles mainly the OnPaint & OnPaintBackground. I've also had to handle the OnLostFocus / OnGotFocus to do painting to override the Base painting since Painting events do not fire unless all the Text is Selected.

Burt Harris7-Dec-02 10:05

Re: Custom TextBox Drawing

7-Dec-02 10:05

Perhaps you are manipulating the hDC scaling parameters and not restoring them before calling the base class.

Burt Harris

mikasa9-Dec-02 2:21

9-Dec-02 2:21

I'll look into it, but I don't think so since I don't even know how to do that Poke tongue | ;-P

Internet Connection

Mazdak7-Dec-02 5:34

Mazdak

7-Dec-02 5:34

I want to see if I am connected to internet and have the ability to show connections dialog box,I know how to do it with Rasapi32.lib library,I want to know if .NET provide some classes for it or not.

Mazy

"And the carpet needs a haircut, and the spotlight looks like a prison break
And the telephone's out of cigarettes, and the balcony is on the make
And the piano has been drinking, the piano has been drinking...not me...not me-Tom Waits

mikasa7-Dec-02 8:15

7-Dec-02 8:15

I believe so, within the System.Net Classes. I can't remeber but there is some code out there somewhere on doing Connections with .NET. Check www.planetsourcecode.com.

leppie8-Dec-02 2:53

leppie

8-Dec-02 2:53

I started working on a RAS wrapper for .NET , but I have no RAS connection anymore so development stopped. I can mail you what I have, to be honest I cant remember how far I got in respect to UI bit, but it has the abilty to connect/disconnect, enum dialups/connections. [edit] seems UI support is there Roll eyes | :rolleyes:

[/edit]

Let me know Smile | :)

DBHelper - SQL Stored Procedure Wrapper & Typed DataSet Generator for .NET

Mazdak8-Dec-02 3:24

Mazdak

8-Dec-02 3:24

Thank you leppie,I just want to learn how to dialup with C# (with .NET framework).I know how to do it with RAS library in C#,I want to know if .NET has any support for itself,not with old library . Smile | :)

Mazy

"And the carpet needs a haircut, and the spotlight looks like a prison break
And the telephone's out of cigarettes, and the balcony is on the make
And the piano has been drinking, the piano has been drinking...not me...not me-Tom Waits

Re: process and network path

leppie8-Dec-02 3:34

leppie

8-Dec-02 3:34

Mazdak wrote:
I just want to learn how to dialup with C# (with .NET framework).I know how to do it with RAS library in C#,I want to know if .NET has any support for itself,not with old library .

No support, but what you will see in the future perhaps is wrappers like the Office assembles which makes use from .NET easier.

Smile | :)

DBHelper - SQL Stored Procedure Wrapper & Typed DataSet Generator for .NET

process and network path

imran_rafique7-Dec-02 0:33

imran_rafique

7-Dec-02 0:33

i want to start a process.for that purpose i am using
this code?

string strProcName"c:\\yplayerinstall.exe";
Process	tmpProcess;
tmpProcess = new Process();
tmpProcess.EnableRaisingEvents=true;
tmpProcess.StartInfo.FileName=strProcName;
try
  {
  tmpProcess.Start();
  while(! tmpProcess.Responding)   System.Windows.Forms.Application.DoEvents();
 }
catch
{}

the above code run sucessfully but when i want to start that exe on the network it does not run.
for example the path is this
-------------------------------------------
\\Imran1\SOFTWARE\Yahoo Player\yplayerinstall.exe
--------------------------------------------
where imran1 is computer name and rest of them are folder names.
if i type this address on start->run then the process executed.
Prcess.start does not work i dont know why?
although i have full rights and i can start that exe by double clicking it?

r00d0034@yahoo.com

mikasa7-Dec-02 8:16

Re: process and network path

7-Dec-02 8:16

Is this a Windows Installer package you are trying to run or a standard EXE? I have noticed that when I try to run Install Packages based on Windows Installer, they will not run unless I Map a drive to the Network directory I am installing from. Have no idea why...

Burt Harris7-Dec-02 9:22

7-Dec-02 9:22

I think this is by design. The .NET Framework implements a code access security model, that limits access not only based on who is running the code, but where the code came from. The idea is to prevent malicious code from doing damage to your system.

Code installed on your local machine is granted full permissions by default, but code downloaded from another machine is limited based on concepts similar to the Internet Explorer security zones, local intranet, internet, trusted sites, restricted sites. Its possible to change the policies that determine what code can do what, but in your case that's probably not the right thing to do.

It sounds like you're trying to write an installer program. Packaging your application as a Windows Installer package (.MSI file) is a better approach. In installing your package, the user makes a decision to trust your code, then it runs from the local machine, with full permissions. If you need to perform special steps during setup you use a "custom action", which are supported in .NET using the System.Configuration.Install.Installer class hierarchy.

It's not a simple change, but learning about it is probably worth while. Try adding a Visual Studio "deployment project" to your solution. Select the deployment project in the solution explorer and be sure to click on the icons that appear at the top of the solution explorer, they aren't obvious at first, once you discover them your on your way.

Burt Harris

Daylight Saving TIme

Bugoy6-Dec-02 20:14

Bugoy

6-Dec-02 20:14

I am writing an application than needs to know if a given date is equal to the start of daylight saving time for the pacific time zone.

Does anybody knows how to do this? Sample code is most appreciated.

Re: Daylight Saving TIme

Jon Sagara6-Dec-02 20:22

Jon Sagara

6-Dec-02 20:22

There is a plethora of DST information out there: http://www.google.com/search?hl=en&lr=&ie=ISO-8859-1&q=daylight+saving+time[^]

Jon Sagara

When I want something, I just go out and buy it. That makes me a go-getter.
-- My sister

multithreading

valisekkagari6-Dec-02 9:36

valisekkagari

6-Dec-02 9:36

Hi,
Presently i have a client server application in C# where server will be listening to port X in an infinite loop.When a client connects to it , it serves the client.Once its doen serving the client,its goes to loop again.
What iam looking for is to have server doing some task and also listening to the port as well.once it gets connection request from the client , it stops its task,serves the client and then continues its task.
I thought of doing this with two threads where in one thread it will listening for the clients and in the other thread it will be doing some task.
In the thread where it comes to know that a client has contacted it, it should signal other thread to stop its task and resume task only when client is served.
Any help on this will be greatly appreciated.Iam doin this in C#.

Srinivas Reddy

Re: multithreading

Burt Harris7-Dec-02 9:46

7-Dec-02 9:46

So the hot way of doing this in C# is to use the asynchronous pattern. This uses multiple threads, but not so explicitly.

Think of it this way: You need one thread that uses Socket.Accept to listen for new connections on the port as you describe. However, when a connection comes in, you don't need to spawn another thread, let the runtime will manage threads for you.

You'll probably want to post a read in response to the connect. Do so with an async method, like NetworkStream.BeginWrite(). You pass a delegate to that method, and when the read completes, the runtime will call you back on what's called a "thread pool" thread. That callback will do some work, and post another asynchronous I/O operation instead of blocking. This way, the thread can return back to the thread pool and be used to service more than one client. This scales much better than a thread-per-client approach. Under the covers, the runtime uses a powerful (if obscure) feature Windows NT call "I/O completion ports", but as a C# programmer, it's fairly easy.

It does call for a design shift. You don't want to block thread-pool threads waiting for I/O, especially network I/O. Instead, you have to break your logic into a set of routines that gather the results from a previous I/O operation (like NetworkStream.EndRead()), do some work, and start another asynchronous operation, perhaps respond using NetworkStream.BeginWrite(). You can even do a BeginWrite follwed with a BeginRead and have both active at the same time, since the Begin methods don't wait for completion.

Warning: Having blocking (synchronous) network call nested deep in several subroutines breaks the model!

The ideal is that you have one thread-pool thread per CPU on your server. That way they can all be working, but you don't encounter excessive context (i.e. thread) switching overhead. In the real world, you typically need more than that because of unpredictable blocking I/O operations like page faults. The runtime & OS dynamically adjust the number of threads to match your program's behavior.

You don't even really need a thread to wait on the Socket.Accept function, as it has an async pair BeginAccept and EndAccept as well.

P.S. I/O Completion ports aren't available on Windows 9x & ME, but don't worry about that, the runtime simulates them if necessary.

Burt Harris

Re: multithreading

valisekkagari12-Dec-02 7:44

valisekkagari

12-Dec-02 7:44

Hi,
Your answer may not suit what iam looking for.Let me explain it.
There is only one client and sever always in my application.Server should be waiting for a connection for this client asynchronously.I mean when client does not connect to server , it should be reading some data base table and doing some calculations e.t.c.
The client now connects to the server and it sends the message which is
basically telling the server that use different database instead of old one since it will be modified.
So at the point where the client connects, the server should stop the processing that it does with the database table.
I thought let one thread handle ..waiting for the client and another thread handle processing database.
When in the first thread ,client contacts the server,iam looking for a way to suspend/stop that thread execution and continue only after client is done talking to server.
basically its like thread1 having capability to suspend thread2 untill its work is done.
is this possible and is there any way to to this.

anyw help will be greatky appreciated.

srinivas

Windows Services

Nic Oughton6-Dec-02 5:44

Nic Oughton

6-Dec-02 5:44

I have created a Windows service using C#, and as a vanilla project - straight from the wizard it will not start.

Previous dotnet based Windows services used to work but suddenly they seem to be incapable of starting, the service manager times them out. All other services are working fine.

I am running Windows2000 Professional, service pack 3 - has anyone else seen or had a problem like this ?

Thanks,

Nic Confused | :confused:

Burt Harris7-Dec-02 9:26

7-Dec-02 9:26

Check your event logs, both Application and System, and peek at the Security log while there. Usually the messages there will give you a hint. I often find help by looking the event source and message ID up on support.microsoft.com.

Hope that helps Roll eyes | :rolleyes:

Burt Harris

Nic Oughton8-Dec-02 23:04

Nic Oughton

8-Dec-02 23:04

Thanks for your reply, but unfortunately there are no indications in the log files.

Cheers,

Nic

Ragavendran Vaidhyanadhan

Ragavendran Vaidhyanadhan7-Dec-02 22:40

7-Dec-02 22:40

Nic Oughton wrote:
has anyone else seen or had a problem like this ?

Sure ... I did have similar problems like this. Some of the services were dependendant services , which were not sarting and the whole thing goofed up !!!
Did ya check for any dependant services...

Ragav