Re: MessageBoxIcon - C# Discussion Boards

monrobot1326-Jul-03 6:21

26-Jul-03 6:21

That's not it. I actually serialize all the listbox items when the form is closed and then deserialize them when it's loaded. When I do this it does show the new information.

When you add an item to a listbox it call's it ToString function to get the text to display. I want to update the text that is being displayed without removing and readding the item.

- monrobot13

Re: Updating Listbox Items

StealthyMark28-Jul-03 0:06

StealthyMark

28-Jul-03 0:06

Don't use ToString().
Add the item itself, or better yet use databinding to display a complete collection. When you edit the collection entry, the listbox is updated (possibly after a call to Refresh()).

equivalent of this.DoEvents() ????

LongRange.Shooter25-Jul-03 10:33

LongRange.Shooter

25-Jul-03 10:33

Does anyone know what the C# WinForm equivalent is of the old VB6 DoEvents() method on forms???

This is the process where a tight loop will allow the form to process events before going back into its' loop.

Thanks!

_____________________________________________
_{The world is a dangerous place.
Not because of those that do evil,
but because of those who look on and do nothing.}

Re: equivalent of this.DoEvents() ????

J. Dunlap25-Jul-03 10:43

J. Dunlap

25-Jul-03 10:43

Application.DoEvents(). But in many cases it's better to use multiple threads.

"Blessed are the peacemakers, for they shall be called sons of God." - Jesus

"You must be the change you wish to see in the world." - Mahatma Gandhi

Re: equivalent of this.DoEvents() ????

LongRange.Shooter26-Jul-03 3:21

LongRange.Shooter

26-Jul-03 3:21

Well...I have the methods I am calling broken out into a DLL. And I did find the Application.DoEvents() to be fairly non-responsive. (2 or 3 button clicks to end the process)

But I'm not really familiar with spawning threads in a WinForm client. What are the basic steps I would need to do to make the component an independant thread? Or if you know of a tuturial...?

Thanks,

MJ

_____________________________________________
_{The world is a dangerous place.
Not because of those that do evil,
but because of those who look on and do nothing.}

Re: equivalent of this.DoEvents() ????

J. Dunlap26-Jul-03 11:51

J. Dunlap

26-Jul-03 11:51

There's sure to be one on CodeProject somewhere, but here's a brief example:

//assumes that the method you want to start the thread on 
//is named "ThreadMethod".
 
//in class
using System.Threading;
Thread thread=null;
 
//in method that starts thread
thread=new Thread(new ThreadStart(this.ThreadMethod));
thread.IsBackground=true;
thread.Start();
//optional - make thread start working before this method completes
Thread.Sleep(0);

"Blessed are the peacemakers, for they shall be called sons of God." - Jesus

"You must be the change you wish to see in the world." - Mahatma Gandhi

MessageBoxIcon

albean25-Jul-03 9:37

albean

25-Jul-03 9:37

Does anybody know how I can access the MessagBoxIcons directly? I want to stick one on a Form (not a MessageBox). Is there some sort of internal imagelist in the Framework?

Re: MessageBoxIcon

Alex Korchemniy25-Jul-03 9:50

Alex Korchemniy

25-Jul-03 9:50

If you use Reflector to decompile the .net framework you will see that the native MessageBox method is called. The MessageBoxIcon is just an enum. The value is passed to the native func as an int.

I suggest opening the native lib with VS.NET and ripping the icons.

Re: MessageBoxIcon

dynamic25-Jul-03 9:50

dynamic

25-Jul-03 9:50

in this folder : ( where your drive goes inplace of " D " )
D:\Program Files\Microsoft Visual Studio .NET\Common7\Graphics\icons

there you will find them , listed under " Computer " i think , although they are embeded in .net for the messagebox's

Vb:

<font color="blue">Public Function</font> TwinsOnWay(<font color="blue">ByVal</font> twins <font color="blue">As String</font>) <font color="blue">As String <br>     Select Case</font> twins<br>         <font color="blue">Case</font> "Gender" <br>             <font color="blue">Return</font> "Two Girls" <br>     <font color="blue">End Select <br> End Function</font> <br>

Re: MessageBoxIcon

Kastro25-Jul-03 9:52

Kastro

25-Jul-03 9:52

The icons are not part of the .NET Framework. The internal implementation of MessageBox.Show just calls the Platform SDK function MessageBox, passing a flag value that specifies the icon you want displayed. The icons themselves are stored as resources in user32.dll.

Get/set method for an array?

frogb0x25-Jul-03 9:35

frogb0x

25-Jul-03 9:35

Hey all,

How can I create a get/set method that returns the Nth item of an array?

Re: Get/set method for an array?

Alex Korchemniy25-Jul-03 9:54

Alex Korchemniy

25-Jul-03 9:54

What do you mean?

The easiest way is to just do array[x]

What exactly are you trying to do?

Re: Get/set method for an array?

frogb0x25-Jul-03 10:00

frogb0x

25-Jul-03 10:00

Well, I have a class Foo(). Inside Foo is a private array of another class, Bar().

public Foo()
{
private Bar[] myBars = new Bar[10];
}

When I instantiate Foo, I need to be able to assign a value to the array of Bars:

myFoo.myBars[n].someValue = 10;

So how can I do this?

Re: Get/set method for an array?

Kastro25-Jul-03 10:00

Kastro

25-Jul-03 10:00

Such a property is called an indexer. You can read a tutorial on them in the MSDN documentation (under "indexers->tutorial (C#)")The following is an example...

public class MyArray {
 
    ...
 
    public Object this[int index] {
        get {
            return _Items[index];
        }
        set {
            _Items[index] = value;
        }
    }
 
    private Object[] _Items;
 
}

System.Drawing from web

Steve McLenithan25-Jul-03 9:19

Steve McLenithan

25-Jul-03 9:19

I am having trouble figuring out how to progamatically save images from a website using this class. I tried this:

private void SaveImages(string url)
{
	int s = Application.StartupPath.IndexOf("bin\\Debug");
	Bitmap img = new Bitmap(url);
	img.Save(Application.StartupPath.Remove(s,9) + "image1.gif", ImageFormat.Jpeg);
}

I get this error message though:
URI formats are not allowed.

Do I have to use a stream object to do this? If so how do I load the remote image into the stream?

Thanks cause I'm lost;)

Steve
McLenithan

Is Bert Evil? | Homer: "Hello, operator, gimme the number for 911!"

Re: System.Drawing from web

dynamic25-Jul-03 9:28

dynamic

25-Jul-03 9:28

here ya go , by chance i built this a few days ago to help someone on another forum Smile | :)

C#:

<font color="blue">private</font> <font color="blue">void</font> button1_Click(<font color="blue">object</font> sender, System.EventArgs e) <br> { <br>        System.Net.WebClient web=<font color="#0000FF">new</font> System.Net.WebClient(); <br> 	System.IO.StreamReader sr=<font color="#0000FF">new</font> System.IO.StreamReader(web.OpenRead("http://www.codeguru.com/forum/images/icons/icon8.gif")); <br>        System.Drawing.Image i=System.Drawing.Image.FromStream(sr.BaseStream); <br>        <font color="DarkGreen">//////////////////////////////////////// </font><br>        i.Save("D:\\myImage.gif"); <font color="#008000">// save the image ( in this case a gif )</font><br> 	<font color="#008000">//////////////////////////////////////// </font><br> 	sr.DiscardBufferedData(); <br> 	sr.Close(); <br> 	web.Dispose(); <br> } <br>

hope it helps

Vb:

<font color="blue">Public Function</font> TwinsOnWay(<font color="blue">ByVal</font> twins <font color="blue">As String</font>) <font color="blue">As String <br>     Select Case</font> twins<br>         <font color="blue">Case</font> "Gender" <br>             <font color="blue">Return</font> "Two Girls" <br>     <font color="blue">End Select <br> End Function</font> <br>

Re: System.Drawing from web

Steve McLenithan25-Jul-03 10:05

Steve McLenithan

25-Jul-03 10:05

[Mr. Burns Eexxcellent!] Thanks dynamic Cool | :cool:

Steve
McLenithan

Is Bert Evil? | Homer: "Hello, operator, gimme the number for 911!"

Re: System.Drawing from web

Alex Korchemniy25-Jul-03 10:02

Alex Korchemniy

25-Jul-03 10:02

Also ....

Instead of using .Remove(s,9) you can use the System.IO.Path static methods: GetParentDirectory()

Re: System.Drawing from web

Steve McLenithan25-Jul-03 10:04

Steve McLenithan

25-Jul-03 10:04

Thanks AK. I didn't even realize that was there;)

Steve
McLenithan

Is Bert Evil? | Homer: "Hello, operator, gimme the number for 911!"

ReadXML to dataset has problem with "&" inside the xml file

johnxt25-Jul-03 8:52

johnxt

25-Jul-03 8:52

I have a XML setting file which has symbol "&" inside.The below code
got exception from ReadXML since the "&"
DataSet ds = new DataSet();
ds.ReadXml(m_xmlPath);

Please help me how to use ReadXML or other methods to solve the problem.
Laugh | :laugh:

Re: ReadXML to dataset has problem with "&" inside the xml file

Alex Korchemniy25-Jul-03 9:08

Alex Korchemniy

25-Jul-03 9:08

If the '&' is in the text it works

XmlDocument xd = new XmlDocument();
xd.AppendChild(xd.CreateNode(XmlNodeType.Element, "test", ""));
xd["test"].InnerText = "&";

But if the '&' is in the XML tags it will fail

xd.AppendChild(xd.CreateNode(XmlNodeType.Element, "&", ""));

I'm not sure, but I think that there is a '&' included somewhere inside the XML tags by the DataSet

Re: ReadXML to dataset has problem with "&" inside the xml file

Radoslav Bielik27-Jul-03 11:15

Radoslav Bielik

27-Jul-03 11:15

Have you tried to replace the & charatcter with & entity reference? I think that all special characters in an XML (or HTML) file should be replaced by their character entity references or numeric references (especially in element attributes) i.e.
& for ampersand (&)
' for apostrophe (')
" for double quote (") etc.

Let me know if this helped.

Rado

Re: ReadXML to dataset has problem with "&" inside the xml file

Radoslav Bielik27-Jul-03 11:21

Radoslav Bielik

27-Jul-03 11:21

This is how it should be Roll eyes | :rolleyes:

& for ampersand (&)
' for apostrophe (')
" for double quote (") etc.

Rado

Re: ReadXML to dataset has problem with "&" inside the xml file

johnxt27-Jul-03 17:38

johnxt

27-Jul-03 17:38

Cool,it works well.
thank you a lot.

John:
Blush | :O

Thread communication

Alex Korchemniy25-Jul-03 8:48

Alex Korchemniy

25-Jul-03 8:48

I have an update polling task on a thread that checks an internet server for updates. If an update is available it fires an event. It turns out that the event handler gets executed on the same thread as the task (sound logical).

BUT

I need the polling thread to die and the handler method to execute on the main thread. How can I do this?

I had a similar problem with Threads and Winforms. Only the owner thread can interact with the control. The solution to that one was a simple Control.Invoke().

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.