Re: Realtime update of Label - C# Discussion Boards

stancrm21-Jul-09 2:45

21-Jul-09 2:45

To authenticate username, password, and domain, use this code. This code is in C++.
http://support.microsoft.com/kb/180548/[^]

Windows Messaging

Blubbo21-Jul-09 1:41

Blubbo

21-Jul-09 1:41

Is there such good tutorial on Windows Messaging that uses WndProc?

Realtime update of Label

Dowse21-Jul-09 1:35

Dowse

21-Jul-09 1:35

Hi all

I am trying to display the value of a variable in a label.

Easy enough I hear you say, but the variable can be changed by many different methods and functions, (some in dll's,) none of which trigger any specific event that I would normally use to update the label.

I need the label to show the current value of the variable in 'real time.'

public class MyClass
{
    public DateTime datStart;        
    public DateTime datNext;     <======== This is the one I'm trying to show     
    public int intParam1;          
    public int intParam2;           
   //Extra fields removed for clarity
}

And then in my form code:

MyClass _myVar = new MyClass();

I have a label called lblInformation that I would like to always show the value of _myVar.datNext.ToString()

I've spent many hours trying to find a solution so any help will be very much appreciated.

Thank you

Re: Realtime update of Label

Luc Pattyn21-Jul-09 1:48

Luc Pattyn

21-Jul-09 1:48

Hi,

this is what I do in such situations:
- create a Windows.Forms.Timer that ticks a few times per second, say 10Hz
- in its Tick handler, set Label.Text=latestValue.ToString()
- done

Thay isn't exactly real-time, however it is almost as fast as the human eye can cope with, and it does not waste CPU cycles on updating all the time assuming the variable could actually be changing at a much higher rate.

BTW: by using the right timer, I also avoided cross-thread problems.

Smile | :)

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Re: Realtime update of Label

Dowse21-Jul-09 2:04

Dowse

21-Jul-09 2:04

Luc

Thank you for a prompt and elegant solution to my problem.

Regards

Martyn

Re: Realtime update of Label

Luc Pattyn21-Jul-09 2:26

Luc Pattyn

21-Jul-09 2:26

you're welcome.

Smile | :)

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Re: Realtime update of Label

Wendelldh21-Jul-09 2:11

Wendelldh

21-Jul-09 2:11

Maybe I am understanding the question, so I will tell you what I would do...

Is it the case that this is an existing class that is used in many different places already, so you don't want to change it to much.

If you have access to the code, you can do this...

First change the member variable to private and rename.

private DateTime dateNext;

The add an event.

public event EventHandler datenextChanged;

Then add a property with the existing name.

public DateTime datNext
{
   get{return dateNext;}
   set
   {
     if(!datNext.Equals(dateNext) && datenextChanged != null)
       datenextChanged(this, EventArgs.Empty);
   }
}

Then you just need to subscribe to this event on your object and update the label in the handler.

Maybe this will work for you if I am understanding the problem.

Thanks,
Wendell

Re: Realtime update of Label

Nagy Vilmos21-Jul-09 2:13

Nagy Vilmos

21-Jul-09 2:13

have you tried making the data bindable and then the form's label simply binds to the instance value. When the datNext changes the label is updated for free.

Panic, Chaos, Destruction.
My work here is done.

Check Box control in datagrid

spankyleo12321-Jul-09 1:33

spankyleo123

21-Jul-09 1:33

Hi,

I am trying to implement a functionality which will allow users to select rows by checking into the check boxes in the datagrid view and displaying the checked item in a new form. Can any1 help me out in this.

Many Thanks,

Re: Check Box control in datagrid

Rutvik Dave21-Jul-09 3:37

Rutvik Dave

21-Jul-09 3:37

try this one...[^]

Multi Forms Application

vhassan21-Jul-09 1:15

vhassan

21-Jul-09 1:15

Hi everyone.

I want to make an application that has one Main Window Form.
From this main form I want to open new forms. Each newly opened form is showed in Taskbar and can be individually closed. But I want main window form to be Owner of all newly opened form.

In the above case I want single instance of Main Form running as an application and if i close the main form all other opened forms should be closed.

I cannot used this.AddOwnedForms(newForm) because there are few restrictions of minimize and focusing main form.

What is best way to achieve this functionality?

Thanks.
Good Day.

Re: Multi Forms Application

musefan21-Jul-09 3:19

musefan

21-Jul-09 3:19

Just create and show all your 'child forms' inside your main form and you should automatically get all the functionality you have asked for

Life goes very fast. Tomorrow, today is already yesterday.

Re: Multi Forms Application

vhassan21-Jul-09 17:41

vhassan

21-Jul-09 17:41

Thank you for reply.

I want Main Form as a separate window. Not like MDI container. Is that possible to have Main Form invoking new windows and works as parent to all new windows?

Get current file path hosted by an Excel process

Muneeb Abdul Shakoor21-Jul-09 1:12

Muneeb Abdul Shakoor

21-Jul-09 1:12

Hi!
I want to get the file path hosted by a certain excel process. I have its Process object only.
Thanks in advance.

Line Numbers display....

spalanivel21-Jul-09 0:34

spalanivel

21-Jul-09 0:34

Hi,
How to skip the single line from the graph while plotting the number.
consider the numbers from 0 to 9 it will be as;( in the For Loop)
Working format:

|||||||||| ---> Graph lines
0123456789 ----> X axis numbers

I need to have the format like;

||||||||||||||||||| ---> Graph lines
0 1 2 3 4 5 6 7 8 9 ----> X axis numbers..

Thanks,
Subbu

Re: Line Numbers display....

Nagy Vilmos21-Jul-09 0:46

Nagy Vilmos

21-Jul-09 0:46

0. It is considered rather bad maners to have multiple unanswered questions.
1. Have you considered using a graph library, zGraph is very good.
2. Format your code, this is a pile of pants:
|||||||||||||||||||
0 1 2 3 4 5 6 7 8 9

But this is purdy:

||||||||||||||||||| 
0 1 2 3 4 5 6 7 8 9

[Highlight the code block and click 'code block'

Panic, Chaos, Destruction.
My work here is done.

C# MDI Application

sateesh villa20-Jul-09 23:40

sateesh villa

20-Jul-09 23:40

Hi,

I am new to C#.I have to develop an MDI apps in C#.
Can anyone give me a sample C# MDI Application, If you have any?

Regards,
Sateesh.

Re: C# MDI Application

Manas Bhardwaj20-Jul-09 23:45

Manas Bhardwaj

20-Jul-09 23:45

sateesh villa wrote:
Can anyone give me a sample C# MDI Application, If you have any?

Here [^]is one article on MDI Apps in CP.

Manas Bhardwaj
Please remember to rate helpful or unhelpful answers, it lets us and people reading the forums know if our answers are any good.

Re: C# MDI Application

sateesh villa21-Jul-09 0:34

sateesh villa

21-Jul-09 0:34

Thank you..
I read it.
Can I get any sample projects anywhere in web?

Re: C# MDI Application

vhassan21-Jul-09 1:00

vhassan

21-Jul-09 1:00

Look into msdn sample applications for C#

Get the input values at the time of scrolling...

spalanivel20-Jul-09 23:37

spalanivel

20-Jul-09 23:37

Hi,

I need to plot the wave format on the usercontrol screen with the use of text file(having input values about 2gig). Horizontal Scrollbar is placed on the panel and if I move the scroll bar the panel should move for certain amount values.

Is it optimal to use the lazy loading technique here.How? Is there any other way to accomplish this task?

Consider the screen width is 300 and wave columnwidth of wave is 30 and the total numbers to plot wave is 3000.

Then 300/30 = 10 waves can be drawn.

How to set the Largechange and Smallchage in the Horizontal Scroll event?

Thanks,
Vel

Re: Get the input values at the time of scrolling...

Nagy Vilmos21-Jul-09 0:41

Nagy Vilmos

21-Jul-09 0:41

I would suggest seperating out your problem.
0. File reading
What is the format of the file?
If it is a fixed length format, can you can read directly any portion of it?

1. Display scroll bar:
Set the scroll bars range to be 0-2990 - the max value is {number of items} - {items to be displayed}
Set the small change to 1, you are moving by a single frame.
Set the large change to 10, you are moving the entire page width.

Panic, Chaos, Destruction.
My work here is done.

Re: Get the input values at the time of scrolling...

spalanivel21-Jul-09 1:30

spalanivel

21-Jul-09 1:30

Thanks Vilmos...

Text File format and it's not fixed length I read from text file and have the values in an ArrayList and I loop through it.

How to set the scroll bar range? Any property need to change?

Getting the 10 values from above arraylist and planning to plot the value as a wave during Horizontal_Scroll() function when scroll left and right? How to achive this?

Regards,
Subbu

Re: Get the input values at the time of scrolling...

Luc Pattyn21-Jul-09 1:55

Luc Pattyn

21-Jul-09 1:55

Hi,

I would like to suggest you read this[^] carefully.

Smile | :)

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The quality and detail of your question reflects on the effectiveness of the help you are likely to get.
Show formatted code inside PRE tags, and give clear symptoms when describing a problem.

Re: Get the input values at the time of scrolling...

Nagy Vilmos21-Jul-09 2:03

Nagy Vilmos

21-Jul-09 2:03

spalanivel wrote:
have the values in an ArrayList

This does produce an overhead in that you need to read everything in upfront, but it's not the end of the world.

spalanivel wrote:
How to set the scroll bar range? Any property need to change?

Once you've read the file, you'll have the number of items in your list:

hScrollBar1.Maximum = this.listOfValues.Count - 10;

spalanivel wrote:
Getting the 10 values from above arraylist and planning to plot the value as a wave during Horizontal_Scroll() function when scroll left and right? How to achive this?

for (int x = hScrollBar1.Value;
     x < hScrollBar1.Value + 10;
     x++) {
    // do some majic
}

Panic, Chaos, Destruction.
My work here is done.

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