Managing at Runtime-created Controls in C# - C# Discussion Boards

gantww1-Jul-05 1:33

1-Jul-05 1:33

Uhh. I was running real low on caffeine when I wrote the above statements. Let me rephrase them. I'm creating a graphics object in paint and drawing to a bitmap first (in many cases, anyway) and then painting that bitmap onto the form using the graphics object provided by the event handler. I'm not invoking the paint event from multiple threads or recursing it - I'm wondering if there is any way that windows (or the development environment) could be doing something like that behind my back. I'm particularly concerned that it may be occurring while I'm debugging the code (I'm using dual monitors, so I don't have all the problems of debugging paint code).

By the way, I checked my code and I was able to reproduce the issue where a colorblend was not ending with 1.0. My calculations were off very slightly. I'm hoping that will fix the issue.

Thanks,
Will

Re: Docking and memory errors

Dave Kreskowiak1-Jul-05 2:57

Dave Kreskowiak

1-Jul-05 2:57

gantww wrote:
I'm wondering if there is any way that windows (or the development environment) could be doing something like that behind my back.

No chance.

gantww wrote:
By the way, I checked my code and I was able to reproduce the issue where a colorblend was not ending with 1.0. My calculations were off very slightly. I'm hoping that will fix the issue.

More than likely.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

web services or remoting or what ?

eng.mohamed30-Jun-05 2:55

eng.mohamed

30-Jun-05 2:55

i want someone help me in this small part of my project
i have client / server App ;
in client there is a login form that send username and password to server
that server chek these in its DB and if true it ((CREAT OBJECT )) called user and send this object to the client machine
i ask about the most effcient tecniuqe is it Remoting or web service ? if it web service i don't want use internet i mean it must be locally
i want help please

Re: web services or remoting or what ?

Judah Gabriel Himango30-Jun-05 4:12

Judah Gabriel Himango

30-Jun-05 4:12

If both client and server are .NET apps, use Remoting.

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Conversation With a Muslim
Judah Himango

Re: web services or remoting or what ?

Sebastian Schneider30-Jun-05 4:15

Sebastian Schneider

30-Jun-05 4:15

Web Service does not mean that you HAVE to go over the internet.

Just have it running on your service and use the machine name on the client. Your network config should then auto-magically decide that no outside routing is necessary.

Cheers,
Sebastian

--
Contra vim mortem non est medicamen in hortem.

Re: web services or remoting or what ?

Adam Goossens30-Jun-05 16:43

Adam Goossens

30-Jun-05 16:43

If you can see your server application being consumed by non .NET clients on the same machine then web services are the only way to go.

Otherwise, I don't see what's wrong with remoting.

See this article, it might help you out: http://www.developer.com/net/net/article.php/2201701

Re: web services or remoting or what ?

Matt Gerrans1-Jul-05 4:53

Matt Gerrans

1-Jul-05 4:53

I hope you really meant to say that you send the username and a hash of the password to the server and check whether they are in the database.

Matt Gerrans

Managing at Runtime-created Controls in C#

tutah30-Jun-05 2:08

tutah

30-Jun-05 2:08

Hi everybody, Smile | :)

I am working on a PDA project and the user interface (UI) should be constructed by reading XML files (XMLTextReader) and upon the contents creating the approperate Contols.

The problem is on the following areas:

1. How to adapt the perant-child relationships between controls obtained from XML file and set them(since .net Compact Framework does not support Name property in Control class)

2. Connecting event handlers is not a problem but how to access within the event handler another controls (not the sender) which will be created in runtime.

Every reply is welcomed!

Thanks in advance for the effort.

tutah

How to add controls to OpenDialog box?

Anonymous30-Jun-05 1:53

Anonymous

30-Jun-05 1:53

How to add controls to OpenDialog box?

Re: How to add controls to OpenDialog box?

Mattias Olgerfelt30-Jun-05 5:54

Mattias Olgerfelt

30-Jun-05 5:54

Is this what you are looking for?
this.regsiterStartupScript("tjoff", "window.open('url', '_blank');")

/M

Re: How to add controls to OpenDialog box?

avivag6-Jul-05 0:16

avivag

6-Jul-05 0:16

I'm sorry that i didnt mention it earlier, but i need to add combobox to opendialog box in winForms.

combobox contents verify fails

fracalifa30-Jun-05 1:49

fracalifa

30-Jun-05 1:49

Hi all,

I'm going to verify a selected item of a combobox with the contents of a datatable in the
combobox.SelectionChangeCommitted method.

But
"SELECT * FROM table WHERE field = " + combobox.Text;
fails due to the combobox.Text doesn't got the selected item yet.

When does the combobox.Text has the valid value from the selected combobox.list ?
Is there a flag to check for completing

I don't want to use a delay or wait.

Thank's for your ideas

Frank

Re: combobox contents verify fails

Guffa30-Jun-05 3:52

Guffa

30-Jun-05 3:52

Use SelectedValue instead of Text.

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

Thread

Rassul Yunussov30-Jun-05 0:44

Rassul Yunussov

30-Jun-05 0:44

How to pass arguments to the thread...
I do the next things in the constructor:

m_PaintThread = new Thread(new ThreadStart(PaintMap));

And next things in function that calls the thread:

if(m_PaintThread.IsAlive)
								{
									m_PaintThread.Abort();
									m_PaintThread.Join();
								}
								m_PaintThread.Start();

So...
In that thread i draw the map, and i call the function CreateGraphics,
but it says that an object reference is required when i call nonstatic method...
I remember in C++ I could pass the parent class in parameter LPVOID lParam,
But how to make it here???

And another question - How to paint map Without Flicking? So how to implement double buffered painting...

Re: Thread

Judah Gabriel Himango30-Jun-05 5:27

Judah Gabriel Himango

30-Jun-05 5:27

Use ThreadPool.QueueUserWorkItem(), which lets you pass a single object argument to your thread. Or use TheDelegateYouAreUsing.BeginInvoke, which allows you to pass all the arguments necessary.

Rassul Yunussov wrote:
How to paint map Without Flicking? So how to implement double buffered painting...

Inherit a new class from the control you want to draw on. In its constructor, use this.SetStyle(ControlStyles.DoubleBuffer | ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint, true);

A word of warning: be careful passing state between threads. It's generally a bad idea because things get hairy when dealing with multiple threads accessing the same variable.

Also, keep in mind you should NEVER access a Windows Form control (or any other Win32 common control-based object) from a thread other than the creating thread. The only Windows Forms control methods you're allowed to call on another thread are Invoke, BeginInvoke, and CreateGraphics().

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Conversation With a Muslim
Judah Himango

Re: Thread

Rassul Yunussov30-Jun-05 20:10

Rassul Yunussov

30-Jun-05 20:10

But how to Stop the thread, created by this method???
It is necessery to stop my thread, because it draws the image in the canvas and if i'll start to draw the scene, when the first thread haven't finished its work they both will draw??? The image will be spoiled... I think...

Re: Thread

Judah Gabriel Himango1-Jul-05 5:05

Judah Gabriel Himango

1-Jul-05 5:05

The thread will stop when the method has finished executing. If you want to cancel it before then, either roll your own cancelling mechanism (have some static "cancelled" flag or something), or use Thread.Abort() and catch the resulting ThreadAbortException.

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Conversation With a Muslim
Judah Himango

Sending multple files to AXIS web service

quim_rocha30-Jun-05 0:15

quim_rocha

30-Jun-05 0:15

Hi,

I'm new to C# and .NET framework.

I need to send several files to a AXIS (Java) web service. This web service takes as Input an HashMap that has the files mentioned. The complex type HashMap has been serialized with success and I'm able to send this type to the service:
eg. :

namespacexpto.mapItem [] mI = new  namespacexpto.mapItem[2] ;<br />
                 mI[0] = new  namespacexpto.InsDoc.mapItem();<br />
                 mI[0].key = "key";<br />
                 mI[0].value = value;

Serialization:

[System.Xml.Serialization.XmlTypeAttribute(Namespace="http://xml.apache.org/xml-soap")]<br />
    public class mapItem {<br />
       <br />
        /// <remarks/><br />
        [System.Xml.Serialization.XmlElementAttribute(IsNullable=true)]<br />
        public object key;<br />
       <br />
        /// <remarks/><br />
        [System.Xml.Serialization.XmlElementAttribute(IsNullable=true)]<br />
        public object [] value;<br />
    }

My question is how can I send (if possible) the files to the Web Service. If that is not possible, can anyone suggest a different approach to the problem.

The Java source that implements the service is:

(...)<br />
                  File ficheiro = new File(filepath);<br />
   FileOutputStream fout = new FileOutputStream(ficheiro);<br />
   <br />
   AttachmentPart teste =(AttachmentPart) map.get("ficheiro");<br />
   <br />
   DataHandler dj = (DataHandler)teste.getDataHandler();<br />
   <br />
   BufferedInputStream in = new BufferedInputStream(dj.getInputStream());<br />
   while(in.available()!=0)<br />
   {<br />
        fout.write(in.read());<br />
   }<br />
   System.out.println("ficheiro is file " +ficheiro.isFile());<br />
   while (ficheiro.length() == 0)<br />
   {<br />
        <br />
   }<br />
   fout.flush();<br />
   fout.close();<br />
                       (...)

Tanks in advance for all the help.

connecting sqlexpress inside IDE

g00fyman30-Jun-05 0:03

g00fyman

30-Jun-05 0:03

how to i connect to sqlexpress from inside .NET IDE ?

i did a full install of 2005 beta2.050215-4400 but i have not been able to get it going for the sql connection to a db file using sqlexpress.

i get the error below (code below is from event log)

i can however connect to sqlexpress from cmd line using sqlcmd -S.\sqlexpress

i have googled and all answers seem to say that changing user instance to false will work. the code below ID 15372 is when instance is set true, when i set it false i get other errors that dont appear in event log but are like;

Directory lookup for the file .. db file ... failed with the operating system error 5 (error not found)<br />
create databse failed .. no permission or database doesnt exist ...<br />
and 2 alter statements failed for same reason

Event Type: Error
Event Source: MSSQL$SQLEXPRESS
Event Category: Logon
Event ID: 15372
Date: 30/06/2005
Time: 7:44:17 PM
User: WEBDEZIGN\maurice
Computer: XPPRO
Description:
Failed to generate a user instance of SQL Server due to a failure in starting the process for the user instance. The connection will be closed. [CLIENT: <local machine>]

please help me
this is driving me nuts

kind regards,
g00fy

normal behaviour for writeline?

beginsomewhere29-Jun-05 23:58

beginsomewhere

29-Jun-05 23:58

hi, i am using writeline to write out very long lines to a file, the lines are approx 2000 chars, but i am getting spurious '0A' in a continuous line,

anyone know why?

Re: normal behaviour for writeline?

Corinna John1-Jul-05 0:27

Corinna John

1-Jul-05 0:27

*.WriteLine methods add "0D 0A" after each row, to produce a windows style line break.
If it only adds "0A", set TextWriter.NewLine to "0D 0A" or use a different encoding.

_________________________________
Please inform me about my English mistakes, I still try to learn your language!

Reminder System

Adoremi29-Jun-05 23:01

Adoremi

29-Jun-05 23:01

Hello,

Anyone can help on giving some sources or examples? I need to develope a small web based reminder system using C# but I could not find any references..
Any good sites?
Thanks a lot~~;)

Re: Reminder System

Dave Kreskowiak30-Jun-05 5:05

Dave Kreskowiak

30-Jun-05 5:05

You're going to have to explain, in more detail, what you mean by a "web-based reminder system". How do you want the user to be notified of the reminder?

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: Reminder System

Adoremi2-Jul-05 6:38

Adoremi

2-Jul-05 6:38

hello,

Actually the system will consist of a small scheduling system which mean that it will remind the login user if there is a meeting on certain date or a due date is reaching..i just need a simple pop up reminder with sounds. (like alarm clock..)

thanks.

Re: Reminder System

Dave Kreskowiak2-Jul-05 16:29

Dave Kreskowiak

2-Jul-05 16:29

All fine and good, but still, what do you mean by "Web based"?

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

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