Re: deserialization problem - C# Discussion Boards

Mic Mathi6-Aug-07 20:55

6-Aug-07 20:55

Hi all,

I did a chat application. But I stuck in the finishing point.

I used a windows service as server. This windows service will create and maintain a remoteable object. The clients are connected to this remoteable object using tcp channel. In addition, I implemented an application for the interface of server. This windows application will run on the server machine. Users are added throw this windows application. In addition, the available users and their status will display in this application.

The windows service with startup type automatic will always run on the machine. Whenever the windows application for the server interface started, It will call a function on the remotable object to attach this application to windows service.

remotableObject.AttachServer(this);

'this' will stored in the 'remotableObject'. So whenever the clients become online or offline, they will send a notification to windows service. If the server interface application is running the windows service will try to list the status of users in a list box. To do this, windows service will pass a serialized class of 'users' to server interface application. Everything is ok till here. I could deserialize the 'users' object. Now only one job is remaining is that list the users in a 'listbox' control. But when i call the functions of listbox, the program stop responding. No errors are displayed. Can you guess what is the problem?

Thanks and Regards,

Mic

Re: Problem in remoting

Parwej Ahamad6-Aug-07 23:55

Parwej Ahamad

6-Aug-07 23:55

Hi Mic,
As per my concern, You are going to update the UI (Form item). I would to say, If you want to update the UI then please do it with the help of delegates. I thought yor are update the UI in any event so it going to stuck.

Please go through how to update the UI via deligates.

Parwej Ahamad
g.parwez@gmail.com

Re: Problem in remoting

Mic Mathi7-Aug-07 0:15

Mic Mathi

7-Aug-07 0:15

Oh yes

the scenario I explained above, it happened when the server interface tried to add a user to remoteable object. Its work in an event of server interface windows application. I tried another example, which is not call from any event. It is working. Therefore, as per you said I will use delegates. But how can you understand that it is the problem of events? Actually I didn't understand what is the real problem that's why I ask. Thanks for your precious advice.

Thanks and Regards,

Mic

Re: Problem in remoting

Parwej Ahamad7-Aug-07 0:19

Parwej Ahamad

7-Aug-07 0:19

Because i have resoved the same problem. I have experience in Instant Messaging architech.

Parwej Ahamad
g.parwez@gmail.com

Re: Problem in remoting

Elayaraja Sambasivam7-Aug-07 1:11

Elayaraja Sambasivam

7-Aug-07 1:11

Try Application.Doevents

Regards
Elayaraja.S

deserialization problem

cyn86-Aug-07 20:45

cyn8

6-Aug-07 20:45

Hi there,

if i got an 3 arraylist to be serialize, each with different type(Point[] or int) how do i deserialize them back to the 3 different arraylist accordingly. Should i save the number of items in each of the arraylist? Check the type? What other methods would u suggest?

Thanks in advance.

Re: deserialization problem

Tormod Fjeldskaar6-Aug-07 21:01

Tormod Fjeldskaar

6-Aug-07 21:01

If you serialize the lists into separate streams, just remember which list resides in which stream and you'll be fine. If you serialize the lists into one common stream, though, make sure you deserialize them in the exact same order they were serialized.

Re: deserialization problem

cyn86-Aug-07 21:11

cyn8

6-Aug-07 21:11

i need to save all the arraylists into a common arraylist and then serialize it because i want to save it into a file. Is this correct?

Below is part of the code i wrote:
In Save()

<br />
ArrayList arr = new ArrayList();<br />
<br />
arr.Add(Arraylist1);//arraylist containing Point[]<br />
for(int i=0;i<br />
{<br />
GraphicsPathData gpd = new GraphicsPathData((GraphicsPath)PathList[i]);<br />
Stream gpdStream = GraphicsPathData.Serialize(gpd);<br />
arr.Add(gpdStream);<br />
}<br />
<br />
arr.Add(Arraylist1);//arraylist containing enum<br />
<br />
formatter.Serialize(myStream, arr);<br />
myStream.Close();<br />
<br />

in OpenFile()

<br />
ArrayList arr =new ArrayList();<br />
			if (openFileDialog.ShowDialog() == DialogResult.OK)<br />
			{<br />
				filename = openFileDialog.FileName;<br />
				Stream myStream = openFileDialog.OpenFile();<br />
				if (myStream != null)<br />
				{<br />
					IFormatter formatter = new BinaryFormatter();<br />
					arr = (ArrayList) formatter.Deserialize(myStream);<br />
					myStream.Close();<br />
<br />
.................

However the problem here, how can i separate the arr into the correct arraylist?

Thanks for your help

Re: deserialization problem

Tormod Fjeldskaar6-Aug-07 21:16

Tormod Fjeldskaar

6-Aug-07 21:16

You don't need a common arraylist to serialize several arraylists into one file. Just make several calls to formatter.Serialize passing the same stream:

formatter.Serialize(myStream, arr1)
formatter.Serialize(myStream, arr2)
formatter.Serialize(myStream, arr3)

To restore the arraylists, make the calls to formatter.Deserialize in the exact same order:

arr1 = (ArrayList) formatter.Deserialize(myStream);
arr2 = (ArrayList) formatter.Deserialize(myStream);
arr3 = (ArrayList) formatter.Deserialize(myStream);

Re: deserialization problem

cyn819-Aug-07 16:32

cyn8

19-Aug-07 16:32

hi there,
Thanks for the reply. Your solution works perfectly for binary serialization. However, i was wondering, does this concept works the same if i want to use XML serialization?
Thanks.

Button Appearance on the form ?

Janu_M6-Aug-07 20:42

Janu_M

6-Aug-07 20:42

Hi i am developing a windows application in C# (in 2003).

My form consists of buttons. I set Flat style to system in properties window.
But no change in the appearance of the button. It is looking normal.

How can i get this(System Style) affect.

Thanks in Advance
Ramu Medida

Re: Button Appearance on the form ?

satsumatable6-Aug-07 21:22

satsumatable

6-Aug-07 21:22

Change your Flat Style as "System" it will take your Operating System style/skins (Ex. XP).

Re: Button Appearance on the form ?

satsumatable6-Aug-07 21:28

satsumatable

6-Aug-07 21:28

Im extreamly sorry ., i might misled you please walk through the following

[^]

Thanks

Re: Button Appearance on the form ?

Janu_M6-Aug-07 22:19

Janu_M

6-Aug-07 22:19

Thank you Very much.

Thanks and Regards
Ramu

Cross thread operation not valid

satsumatable6-Aug-07 20:34

satsumatable

6-Aug-07 20:34

Hi
I did code to access my control(text box etc) inside the thread but when i upgrade it into VS 2005 it is saying "cross thread operation not valid" how can fix it ?

- Thanks

Re: Cross thread operation not valid

sunil20046-Aug-07 20:48

sunil2004

6-Aug-07 20:48

Dear Siva,
Is that is happening in debugh mode or it happens in release build also?
I also face the same problem while debugging the application Frown | :(

but it works fine in release build.

Regards,
Sunil Tonger

Re: Cross thread operation not valid

blackjack21506-Aug-07 20:59

blackjack2150

6-Aug-07 20:59

Control.CheckForIllegalCrossThreadCalls = false;

Put this line in the constructor of your form.

Re: Cross thread operation not valid

lmoelleb6-Aug-07 21:07

lmoelleb

6-Aug-07 21:07

Yes, when you are doing something referred to as "Illigal" then obvious choice is to disable the check so you can get on with your high quality code. Dead | X|

Look at Invoke and BeginInvoke. Yes, they are annoying, but not half as annoying as the deadlocks you get when not using them.

Re: Cross thread operation not valid

satsumatable6-Aug-07 21:20

satsumatable

6-Aug-07 21:20

Control.CheckForIllegalCrossThreadCalls = false; will this cause any issues?

I have code in 2003 which access controls inside thread and so far it is going good. I placed this command in 2005 and tried it already and it looks OK, i want to make sure by making this "CheckForIllegalCrossThreadCalls" as false will not cause any serious issues. Do you think?

http://www.codeproject.com/csharp/threadsafeforms.asp[^] this should be the right choice but lot of rework Smile | :)

Re: Cross thread operation not valid

lmoelleb6-Aug-07 22:51

lmoelleb

6-Aug-07 22:51

Of course setting the option to false will cause issues. Microsoft did not add a random unneeded check just for the fun of it.

Typical behaviour will be random hanging your entire GUI. This can happen on all systems, or just a few. It can also appear to be working fine, then suddently start hanging due to an update from Microsoft, a new OS, or whatever.

Re: Cross thread operation not valid

Hessam Jalali6-Aug-07 21:32

Hessam Jalali

6-Aug-07 21:32

just use delegate for invoking them

Here is my code and it's work fine in vs2005

public delegate void CrossThreadHandle(object arg);


        void SetLabelStatus(object txt)
        {
            this.labelDownloadStatus.Text=txt as string;
        }


        void dl_StatusChanged(Downloader sender, Downloader.DownloadStatus status)
        {
           CrossThreadHandle dLabel=new CrossThreadHandle(this.SetLabelStatus);
            this.Invoke(dLabel,sender.Status.ToString());

            Application.DoEvents();
        }

Hope it would Help

Re: Cross thread operation not valid

Vasudevan Deepak Kumar7-Aug-07 0:53

Vasudevan Deepak Kumar

7-Aug-07 0:53

http://www.codeproject.com/useritems/AccessControlFromThread.asp[^]

Vasudevan Deepak Kumar
Personal Homepage
Tech Gossips

deployment in window

Sonia Gupta6-Aug-07 20:12

Sonia Gupta

6-Aug-07 20:12

can i make the setup to detect the .net framework automatically, before the setup of the application take place.so that i don't get the message .net framework is not installed in the machine.

Sonia Gupta
Soniagupta1@yahoo.co.in
Yahoo messengerId-soniagupta1
Love is Friendship and Friendship is Love....

Re: deployment in window

Bhupi Bhai6-Aug-07 21:02

Bhupi Bhai

6-Aug-07 21:02

Hi Sonia,

Assuming that you are using .net Setup & Deployment project in VS.
Create a Launch Condition - Add Registry Search - set the RegKey & Value property to:
Keys:
For the .NET Framework 1.0:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\policy\v1.0
For the .NET Framework 1.1:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\policy\v1.1
For the .NET Framework 2.0:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\policy\v2.0
Value:
For the .NET Framework 1.0: "3705"
For the .NET Framework 1.1: "4322"
For the .NET Framework 2.0: "50727"

Then add new LauchCondition and set the Condition property to:
For the .NET Framework 1.0:
REGISTRYVALUE = "3321-3705"
For the .NET Framework 1.1:
REGISTRYVALUE="3706-4322"
For the .NET Framework 2.0:
REGISTRYVALUE="50727-50727"

Hope that helps.

Regards,
Bhupi Bhai.

Re: deployment in window

Sonia Gupta6-Aug-07 21:17

Sonia Gupta

6-Aug-07 21:17

what is new launch condition and Condition property ?
Please explain

Sonia Gupta
Soniagupta1@yahoo.co.in
Yahoo messengerId-soniagupta1
Love is Friendship and Friendship is Love....

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