question about interface - C# Discussion Boards

RepliCrux19-Jul-07 12:46

19-Jul-07 12:46

You can try writing client side code, javascript may be.

In the textbox, you can register the script for key up (or some other as convenient)
txtBox.Attributes.Add("onKeyup",javascript:ShowText(this.ID)");

and javascript:

ShowText(param)
{
var textBox = document.GetElementByID(param);
alert(txtBox.Value);
}

hope that does that.

Re: C# Webbrowser and form questions

Sean G. Murphy22-Jul-07 7:40

Sean G. Murphy

22-Jul-07 7:40

That lead me perfectly down the path I needed to go. Thanks RepliCrix!
For anyone else out there, the code I used was
C#
public form1()
{
InitializeComponent();

// Make the form the scripting object
browser.ObjectForScripting = this;

// Display the html file file.html
browser.Navigate(Application.StartupPath + "\\file.html");

}

void Button1Click(object sender, EventArgs e)
{
foreach(HtmlElement elt in browser.Document.Forms)
{
foreach(HtmlElement child in elt.GetElementsByTagName("INPUT"))
{
browser.Document.InvokeScript("SendTypedText", new object[] { child.Name });
}
}
}

public void ShowText(string ibox_name, string ibox_value)
{
MessageBox.Show(ibox_name + " = " + ibox_value);
//Of course now you can do whatever you need to do with the data
}

//file.html code

Box1:

Box2:

Box3:

//Send Back Input Values
function SendTypedText(param)
{
var thisForm = document.forms[0];
window.external.ShowText(param, thisForm[param].value);
}

Thanks!
Sean Murphy
"All things great and small start at the same point, the first step."

OpenLDAP --- alternative?

devvvy18-Jul-07 15:12

devvvy

18-Jul-07 15:12

hi looking for an open source LDAP server for use in conjunction with C#/.NET - any good suggestion besides openldap?

Correct me if I'm wrong, don't find a good number of documentation/tutorial with OpenLDAP, from perspective of a dot-net developer.

I'm using this for hierachical information storage - user/group, classification... etc...

Thanks in advanmce

devy

using bitmap or draw directly

cyn818-Jul-07 14:55

cyn8

18-Jul-07 14:55

Hi,
I need some expert opinion. Assume that i need to display 3 shape(circle, rectangle and a triangle). I should be able to select any of them at one time to be drag and drop. So, should i draw these shape onto the form directly or should i save it in the bitmap and load the image. if using bitmap, each of the shape must be save separately?

Thanks

Re: using bitmap or draw directly

Luc Pattyn18-Jul-07 22:55

Luc Pattyn

18-Jul-07 22:55

Hi,

I see no reason to use bitmaps for this.
As long as you get the drawing to look the way you want it to look,
by just using a couple of Graphics drawing primitives, just do that.

If the intended result requires a lot of shading, reflections, whatever (so it looks
more like a picture, not a computer generated drawing), then you might want to switch
to bitmaps.

Smile | :)

Luc Pattyn

try { [Search CP Articles] [Search CP Forums] [Forum Guidelines] [My Articles] }
catch { [Google] }

A Question About Using Timers -- New C# User Here

bobber20518-Jul-07 13:30

bobber205

18-Jul-07 13:30

I've done a decent amount of C++ in school last year (college level work) and I was interested in giving a GUI C# work a go.
I have experience in a couple BASIC languages and Java, that coupled with my C++ experience has made it fairly painless so far. Smile | :)

I have a class called "UpdateTimer" that obviously implements a Timer object. The class is passed the data class from where it gets all of its data. However, once it has completed, I want it to refresh the data in two labels.

I have tried both referencing to the lables directly and the method in Form1.cs that called "refreshData()" both with no luck.

I am lost on what to do. I am sure that my methodology is wrong. I would like to be able to implement the timer outside of the Form1 class.

Thanks for any assistance!;P

Re: A Question About Using Timers -- New C# User Here

Jimmanuel18-Jul-07 14:26

Jimmanuel

18-Jul-07 14:26

You're writing your own timer object? .Net provides timers for you - there's the Timers.Timer[^] for general all purpose use, and the Windows.Forms.Timer[^] for thread-safe use with Windows Forms.

If those don't suit your fancy, what kind of problems are you having with the "UpdateTimer" class?

question about interface

abstar18-Jul-07 13:24

abstar

18-Jul-07 13:24

hi guys:
can everyone tell me, what is interface, why do we use interface and when do we use interface?

thanks

Re: question about interface

Ed.Poore18-Jul-07 13:30

Ed.Poore

18-Jul-07 13:30

A quick Google[^] would reveal the answer. Ok the page is in VB but it demonstrates the concept, basically an interface is a contract. When you implement an interface you are basically signing an agreement that you will implement all the fields, properties and methods defined in the interface. You can then rather than dealing with definite objects you can deal with the common interface without having to know what the underlying type is.

It's commonly used in plug in[^] based systems.

My Blog[^]

Window.Opener equivalent

Craigpt18-Jul-07 11:28

Craigpt

18-Jul-07 11:28

Hi All,
I have a page that is used in two separate scenarios, either directly linked in the web application, or as a popup using window.open. On this page is a datagrid with three columns i care about, column1 is just some information (a KeyWord) and defaulted to visible=false for when the page is used as a popup, column2 is the same information but used as a link when the window is a popup, and column3 is a select command item also default to visible=false.

basically, i want it so that when used as a popup:
column1 = visible false
column2 = visible true
column3 = visible false

when linked in the main window:
column1 = visible true
column2 = visible false
column3 = visible true
(the exact opposite)

I want to be able to check onload the page's status, and change the visibilities accordingly. Changing the visibility is easy enough, but i can't find a way to check whether or not this page is a popup (window.opener != null) or not (window.opener == null) using server side code.

Any help would be appreciated

Re: Window.Opener equivalent

Guffa18-Jul-07 13:28

Guffa

18-Jul-07 13:28

Craigpt wrote:
i can't find a way to check whether or not this page is a popup (window.opener != null) or not (window.opener == null) using server side code.

You can't. The browser doesn't tell the server where the page will be displayed, so the server simply doesn't know.

If you put a value in the querystring that reflects how the page is used, the server can check that value.

---
single minded; short sighted; long gone;

Re: Window.Opener equivalent

Craigpt19-Jul-07 4:46

Craigpt

19-Jul-07 4:46

Guffa wrote:
The browser doesn't tell the server where the page will be displayed, so the server simply doesn't know.

Ok thanks, that's what i needed to know. I remembered the popup window already had querystrings in the URL so i just used the presence of those to decide.

Re: Window.Opener equivalent

Ed.Poore18-Jul-07 13:30

Ed.Poore

18-Jul-07 13:30

Wouldnt' this be more appropriate in the ASP.NET forum?

My Blog[^]

Re: Window.Opener equivalent

Craigpt19-Jul-07 4:47

Craigpt

19-Jul-07 4:47

Ya, it was a toss-up for me, but i decided that in the ASP.net forum i ran the risk of getting a VB.Net answer, and if code was available i wanted it in C#

Re: Window.Opener equivalent

Ed.Poore19-Jul-07 6:50

Ed.Poore

19-Jul-07 6:50

There isn't that much difference and both can easily be translated between the other, besides you could always just ask for it to be given in C#.

My Blog[^]

DataGridView && ErrorProvider

Taras61118-Jul-07 11:21

Taras611

18-Jul-07 11:21

Hi everybody!!!
How I can use ErrorProvider in DataGridView??? (It is for notice when the input data in some field is failur. In this case you mast see blinking of ErrorProvider in some field)

Re: DataGridView && ErrorProvider

TheTinSoldier18-Jul-07 11:31

TheTinSoldier

18-Jul-07 11:31

Use the ErrorText property:

<code>private void dgv_CellValidating(object sender, DataGridViewCellValidatingEventArgs e)
        {
            DataGridView dgv = sender as DataGridView;

            if (dgv.IsCurrentCellInEditMode)
            {
                 dgv.Rows[e.RowIndex].ErrorText = "You made an error";
            }
        }

Re: DataGridView && ErrorProvider

Taras61118-Jul-07 20:54

Taras611

18-Jul-07 20:54

Thak you for help! But I want to put ErrorProvider in field of DataGridView! So I add:

<br />
private void dataGridView_CellValidating(object sender, DataGridViewCellValidatingEventArgs e)<br />
{<br />
    DataGridView dgv = sender as DataGridView;<br />
    if (dgv.IsCurrentCellInEditMode)<br />
    {<br />
        dgv.Rows[e.RowIndex].Cells[0].ErrorText = "You made an error!";                <br />
    }<br />
} <br />

Using Using object disposal...

TheTinSoldier18-Jul-07 11:17

TheTinSoldier

18-Jul-07 11:17

Check this code.

Two questions:

1. After opening the serial port do I need to worry about closing the port as when I return (leave the using scope) the object will automatically be disposed?

2. If the code enters the catch block will the serial port object automatically be disposed after leaving the using scope?

Thanks!

public static bool IsPortInUse(string portName)
{
    try
    {
        using(SerialPort sp = new SerialPort(portName))
        {
            sp.Open();
            return false;
        }
    }
    catch (UnauthorizedAccessException e)
    {
        return true;
    }
}