|
Try the SQL and/or XML forums. This forum is for C#, a programming language for the .NET Framework.
Microsoft MVP, Visual C#
My Articles
|
|
|
|
|
Hi,
I have asked something similar before but was distracted by another part of the app I am implementing and am only getting back to implement this part.
The problem is I have a client/server app. On the client I have a form which acts as a 'splash screen'. Using a combination of a few different methods I have 'locked-down' the client so that it is not possible to use the pc. What I need to do, using remoting, is to allow the server app to hide the splash screen form at the click of a button, therefore allowing users of the pc to use my client app. What I am attempting to implement is a internet cafe management system. All clients are locked until released by the server app by the splashscreen.
I am on a pretty tight time schedule so if anyone could help me with a bit of sample code to allow me to show/hide a remote form, or a nod in the right direction I would be really really grateful,
Thanks in advance,
John
|
|
|
|
|
One easy way would be to declare an interface with the Show and Hide methods:
public interface IVisibleProvider
{
void Show();
void Hide();
}Put this in an assembly shared by the client and server code. The client control can easily implement this - the Show and Hide methods already exist so just implement the interface without having to define the methods and you're done. The server can make calls on the client using this interface using the appropriate activation types (like a singleton or client-activated type) that allow the server to make calls back to the client (so use a TcpChannel as well since HTTP is a client-request, server-respond protocol by nature).
Another way is just to have the client handle the clicks or key presses and call a method on the server - passing some sort of client ID - and the server returns a value that signals if the client can be unlocked or not. If it can, unlock it, otherwise ignore the click or yell at the user. This would be much easier to implement and would allow you not only the ability to use either the TCP or HTTP channels, but also just to use a simple XML web service, much easier to implement and easier to make secure through the Web Service Enhancements (WSE) 1.0 SDK from Microsoft (includes WS-Security, WS-Identity, WS-Routing, and more and easily integrates with Web Service code) if you desired extra security (so users don't intercept messages and change them before they reach their destination).
Microsoft MVP, Visual C#
My Articles
|
|
|
|
|
I implemented the idea using an interface. However I am getting the following error when I leave the system idle for a few minutes and then try to show/hide the form across the network:
"no receiver registered"
From what I have been reading there is a timeout on the leave given to the object. Its getting a bit above my head at the moment. Is there any easy way to set the timeout to never? Have looked at the microsoft site and did a search but its very technical. Any pointers anyone?
Thanks,
John
|
|
|
|
|
This has to do with lifetime management, not connection timeouts. Since all remotable objects must derive from MarshalByRefObject, you can override InitializeLifetimeService and return null, which means the remote object stays active forever.
You should pick up a good book on Remoting, like "Microsoft .NET Remoting" from http://www.microsoft.com/mspress[^] or "Advanced .NET Remoting" from http://www.ingorammer.com[^].
Microsoft MVP, Visual C#
My Articles
|
|
|
|
|
Hello,
I'm trying to globalize my application built with Forms in C#.
The language is to be chosen by user thanks to a ComboBox.
When a language is selected interactively, I set CurrentUICulture, but the problem is that I can't manage to change automatically the Form's language (title, text labels, etc)... unless I close the window and instanciate a new one.
I've tried using Refresh and Update but it has no effect :
private void Combo_SelectedIndexChanged(object sender, System.EventArgs e)
{
Thread.CurrentThread.CurrentUICulture = new CultureInfo(_Lang[Combo.SelectedIndex]);
Refresh();
}
Any idea ?
Regards,
- Éric -
|
|
|
|
|
Refresh and Update have to do with painting, not reassigning values. To do that, you basically have to do everything you would typically find in InitializeComponent except instantiation, i.e. reassign all your resources (strings, sizes, points, etc.) to their controls. If you localize everything that's localizable (which the designer does, which is extremely inefficient) you should do so in between calling the container control's SuspendLayout and ResumeLayout methods for faster layout.
Microsoft MVP, Visual C#
My Articles
|
|
|
|
|
Its there a component or class that can be mapped or assigned to a database table and when the table change (insertion, delete or update) fire an event or send a notifycation to tell the aplication about the change
thanks....
|
|
|
|
|
There is SQL Server Notification Services which is a separate installation apart from SQL Server. IIRC, you can use Web Services or MSMQ. It can send notifications based on SQL events or scheduled events.
Microsoft MVP, Visual C#
My Articles
|
|
|
|
|
Hi,
I have DotNet remoting question and this is related to while development. I am working on C#/windows application. One of client (window form) need to access the method remotely (from remoting server)...Question:
When I am building the client while in development mode do I have to set reference explicitly to the DLL server (remotable object) because if I do that then when moving to production, I don't know in which folder remote server .DLL would be installed.
Favourite quote:
In youth we learn, In age we understand.
|
|
|
|
|
Maybe you can use UDDI? We use it to find a webservice..
|
|
|
|
|
It's recommended you do not share the actual remotable library. Use interfaces instead, and share only the interface. For example
public class MyRemotableDll : MarshalByRefObject, IMyRemotable
{
void SomeMethod()
{
}
}
MyRemotableDll obj = new MyRemotableDll();
RemotingServices.Marshal(obj, "obj.rem");
public interface IMyRemotable
{
void SomeMethod;
}
IMyRemotable theRemoteObj = (IMyRemotable)RemotingServices.Connect(typeof(IMyRemotable), "http://localhost:4030/obj.rem");
theRemoteObj.SomeMethod();
Hope that helps.
---------------------------
He who knows that enough is enough will always have enough.
-Lao Tsu
|
|
|
|
|
Judah,
Thanks for the nice solution. I have further question in your solution and it may sound stupid but help me.
When I am using interfaces on client side how the call reaches to particular piece on server where this interface is implemented. I mean to say that this interface may have been implemented in different different areas. I know that to reach particular piece we do registration of server and give right address (tcp/http) on client side but my question is interface is just an abstract thing. How the call from client actually reaches to server. Please help..
Favourite quote:
In youth we learn, In age we understand.
|
|
|
|
|
In addition to what Judah said (which is the preferred way when you have control over development like this), you can also use soapsuds.exe from the SDK to generate a client proxy (for cases when you can't dictate how the remote object is developed or deployed).
Microsoft MVP, Visual C#
My Articles
|
|
|
|
|
Hi,
What library do you use to zip up files? I am using java.util.zip and it's giving me some problems.
Everything works fine if WInZip is installed. However if you uninstall WinZip and it uses the Windows default compresser things don't work so well:
the zip file is created but it's empty.
Does anyone know a solution to this problem?
Thanks,
Elena
Here is my code:
<br />
ZipOutputStream m_zipstream; <br />
string filepath = @"C:\Elena\Junk\test\a.txt";<br />
m_zipstream = new ZipOutputStream( new java.io.FileOutputStream( @"C:\Elena\Junk\test\zip.zip" ) ); <br />
ZipEntry currententry = new ZipEntry(filepath);<br />
currententry.setMethod(ZipEntry.DEFLATED);<br />
<br />
m_zipstream.putNextEntry(currententry);<br />
<br />
try<br />
{ <br />
java.io.FileInputStream current = new java.io.FileInputStream(filepath); <br />
try<br />
{<br />
sbyte[] buffer = new sbyte[8192];<br />
int buffercount;<br />
while ((buffercount = current.read(buffer, 0, buffer.Length)) > 0)<br />
m_zipstream.write(buffer, 0, buffercount);<br />
}<br />
finally { current.close(); }<br />
}<br />
finally { m_zipstream.closeEntry(); }<br />
m_zipstream.close(); <br />
m_zipstream = null;<br />
Elena
|
|
|
|
|
Free one here[^]
---------------------------
He who knows that enough is enough will always have enough.
-Lao Tsu
|
|
|
|
|
What is the common practise of updating build and revision number if I want to increase it sequentially (i.e. not using the automatic VS.NET way) for every build? If I increase build number on every build, what about revision number? Does build number and/or revision number ever get reset to 0?
|
|
|
|
|
This project here on CP does that automatically (add-in for VS.NET I believe)
|
|
|
|
|
Hello everybody!
I've written a JavaCoder. With this program I can create,edit,... my java source files. I have even been able to highlight the syntax ( like in Visual Studio. NET  ).
Now I've got a question: 
How can I make a code-completion? 
I use a richt-text-box to edit my files.
Can anyone help????
Thanks
petermax2
|
|
|
|
|
petermax2 wrote:
I use a richt-text-box to edit my files.
Not the best choice of editors. You spend more time overriding functionality than just doing a code editor from scratch. There are also many examples out there (see http://www.gotdotnet.com/workspaces[^]) that could give you some hints.
How do you get command-completion to work? For languages that support it, you use reflection (which Java supports). When you hit the member separator (typically "."), you reflect (and cache, if you haven't already - which is a good idea) the members. I assume you're doing this in C# since you're in the C# forum, so you'll need to use a native JNI DLL and encapsulate that in a managed class. Click "My Articles" in my sig and see my Java/.NET article for a discussion on that. See the JNI docs on Sun's http://java.sun.com[^] site for more information about using Java classes from C/C++.
Microsoft MVP, Visual C#
My Articles
|
|
|
|
|
Heath Stewart wrote:
Not the best choice of editors.
What else can I use?
Regards
|
|
|
|
|
As I mentioned, right your own or borrow ideas appropriately from vast numbers of examples out there on the web. I even gave you a link to the GotDotNet workspaces where you'll find many examples. leppie - another regular on CodeProject - replied below that he's been working on one. There are tons of examples - just do some research if you don't know how to write a text editor.
Microsoft MVP, Visual C#
My Articles
|
|
|
|
|
Heath Stewart wrote:
You spend more time overriding functionality than just doing a code editor from scratch.
Exactly what I have been doing the last 3 months, doing a custom rendered code editor. Still needs some work, but its almost done. 
top secret
|
|
|
|
|
How did you start?
Can you give me some ideas?   
Oh, and what means this:
leppie wrote:
top secret
???
Regards
|
|
|
|
|
petermax2 wrote:
How did you start?
I started thinking it wouldnt be more than a 1000 lines. Its 7000+ now! Most of the time was spent designing and developing fast algorithms to replace known slow operations. Thanks to my design, adding a new language hilighting scheme is a breeze (not always, need to make it better still), and it currently supports 5 langauges: C#, C, MSIL, Nemerle, and XML (beta).
petermax2 wrote:
Can you give me some ideas?
I'm going to be releasing the source under a GPL/LGPL license within the next 3 months.
Some ideas you mite wanna ponder on if you cant wait:
- Write down your goals and get the big picture on paper and stick to it. If you change it, start from scratch.
- Design, design, design (you can never be too sure).
- KISS, think how things exponitanally can affect future dependant operations.
- Fimiliarise yourself with how painting and clipping is done (a new article on CP is very informative on some painting stuff). Know the limits of related Drawing objects (like the maximum area of a region).
- Modularize all aspects, but keep them tighly integrated so information is not required to be duplicated. Memory and speed are your biggest enemies!
- Dont write any code until u know exactly what your design spec specifies and that it is known to work correctly. Run simulations in your head.
- DO NOT look at SharpDevelops attempt. It was a good design ruined by terribly sloppy coding.
- Think how things can be speeded up. eg you have a big file and you are near the end of the file, it will obviously be better to do calculations from the end (or even some nearer known point).
Now that I have scared you enough, I think a small wait will be worthwhile
petermax2 wrote:
???
It's meant to be an IRC link. Install mIRC!
Feel free to ask anymore questions.
top secret
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
