Visual Basic

load images in list without stopping execution

15-Jan-07 5:26

kendo17 wrote:
minimum 200 text boxes on form and maximum 600 text boxes

You really need to rethink this. If I saw an application that did this, I recommend to the customer that they uninstall it and finding a different solution provider.

Dave Kreskowiak
Microsoft MVP - Visual Basic

Eric Georgiades15-Jan-07 3:07

Eric Georgiades

15-Jan-07 3:07

i have a form with a list that shows thumbnails of many jpg pictures.

i works with a loop, that looks through the paths of the jpgs from a database, and adds the image to a image list, then adds the item into the list with the corresponding image.

works fine.

the problem is, that loading the images delays the program execution, and so I've made it into a "please wait" dialog, but still its quite slow.

how can i create a method that loads the list without the images, and then, without pausing execution, (i.e. in the background) loads the images (into the image list) one by one.

I've tried a few ways, some work but it's very inefficient Frown | :(

thank you in advance

Ericos Georgiades

Dave Kreskowiak15-Jan-07 5:46

15-Jan-07 5:46

You'll have to move your image loading code to a background thread. There's many examples of using the BackgroundWorker component. All you have to do is Google for it.

Dave Kreskowiak
Microsoft MVP - Visual Basic

Eric Georgiades15-Jan-07 7:11

Eric Georgiades

15-Jan-07 7:11

i've already tried a background worker, yet i guess i need to time it better or work on the code
cause it loads them and if you touch one unloaded it ruins certain things (guess i'd just disable them
at first)

thank you, guess i was waiting for a diffrent approach but this is probably the best way

Ericos Georgiades

nlarson1115-Jan-07 5:48

nlarson11

15-Jan-07 5:48

1) use a databound listbox and get the records from the database and set the datasource to the result

2) look into "threading" to load behind the scenes.

Eric Georgiades15-Jan-07 7:12

Eric Georgiades

15-Jan-07 7:12

if i set the datasource on the listbox (haven't tried it) then how do i get to load jpgs into it?

i didn't think i could, i'll give it a try (with a databound imagelist aswell?) thanks

Ericos Georgiades

Change the Panel Control to a Button

nlarson1115-Jan-07 7:37

nlarson11

15-Jan-07 7:37

1) load the listbox
2) then use the same dataset to load the images.

charchabil0315-Jan-07 2:28

charchabil03

15-Jan-07 2:28

I would like your help with the following
I have drawn an ellipse(fillellipse...)
i would like to have control on that ellipse, means when pressing on the drwan ellipse(mouse Hover) (do action....)

i thought of the following :
how to : Change the Panel Control to a Button (how to do that)??

is there any other way of thinkin

Regards
Ramy

Dave Kreskowiak15-Jan-07 5:44

15-Jan-07 5:44

charchabil03 wrote:
how to : Change the Panel Control to a Button (how to do that)??

If your asking how to convert a Panel class to a Button, you can't.

If you're asking how to treat the Panel link a button, all you have to do is handle the Panel's Click event.

What are you really trying to do with this???

Dave Kreskowiak
Microsoft MVP - Visual Basic

charchabil0316-Jan-07 6:32

charchabil03

16-Jan-07 6:32

first thx for answering
I have drawn an ellipse (fillellipse)
all waht i want to handle the click event of that drwan ellipse

Regards
Ramy

Dave Kreskowiak16-Jan-07 12:14

16-Jan-07 12:14

The ellipse isn't a clickable object. It's only a picture drawn on the surface of another control.

I think I know what you're after. Something like a paint application where you can select the various object you've drawn, like lines, rectangles, and circles, and move them around after you've drawn them.

If this is true, you've gotten yourself into a fairly large application. An example of which you can find here[^].

Dave Kreskowiak
Microsoft MVP - Visual Basic

Binding controls to columns with default values

charchabil0328-Jan-07 23:13

charchabil03

28-Jan-07 23:13

Dave Kreskowiak wrote:
The ellipse isn't a clickable object. It's only a picture drawn on the surface of another control.

Yes i know that
I found the following

// Check if we are dealing with Button here<br />
			else if(control is System.Windows.Forms.Button)<br />
			{<br />
				// Cast to a button object<br />
				Button button = (Button)control;<br />
<br />
				// Do not show button text<br />
				button.Text = "";<br />
				<br />
				// Change cursor to hand when over button<br />
				button.Cursor = Cursors.Hand;

the aboce as u notice is written with C#
can you help to modify it ,and write in vb.net 2005?
i have drwan many ellipse.and all waht i want is to be able to click on that drwan ellipse,when the user clicks on ellipse1 do action 1.if he click on ellipse2 do action2....
Thx

Regards
Ramy

MatthysDT15-Jan-07 0:47

MatthysDT

15-Jan-07 0:47

How do I set my databound form controls to contain the same default values as specified by my database? So that I don't get "does not allow NULL" errors when adding and saving a new record.

According to me the controls are properly bound by bindingsource - the works.

(VS2005 & SQL2000)

you can't forget something you never knew...

"Watching Migthy Joe Young made me hate my life..................................I want a gorilla!" A. Havemann

Re: Binding controls to columns with default values

Kschuler15-Jan-07 9:39

Kschuler

15-Jan-07 9:39

Before you add a new row to your DataTable control you should set the .DefaultValue of each column in that DataTable. Personally, I always set my DefaultValues to an empty string if it is a text column, and a zero if it a numeric column. To do this, I use this method in my global module:

Public Sub SetDefaultValues(ByRef dt As DataTable)<br />
    For Each colColumn As DataColumn In dt.Columns<br />
        Select Case colColumn.DataType.FullName<br />
            Case "System.String"<br />
                colColumn.DefaultValue = String.Empty<br />
            Case "System.Decimal"<br />
                colColumn.DefaultValue = 0<br />
        End Select<br />
    Next<br />
End Sub

Hope this helps.

Get username and password

Socheat.Net14-Jan-07 23:29

Re: Get username and password

14-Jan-07 23:29

Can anyone one give me an example to make application that can get Username and password when user use yahoo messenger,....

Thanks

................

Christian Graus14-Jan-07 23:57

Christian Graus

14-Jan-07 23:57

That's a really broad question, more the sort of thing you'd ask on a paid site. I presume that yahoo wouldn't expose that information, I'd sure hope not. I can't think of why you'd want it, except to steal someone's account. And that would be bad.

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog

Re: Get username and password

Socheat.Net16-Jan-07 0:05

Re: Get username and password

16-Jan-07 0:05

NO, I just want know the proscess

................

Christian Graus16-Jan-07 0:52

Christian Graus

16-Jan-07 0:52

There isn't one.

Christian Graus - C++ MVP

'Why don't we jump on a fad that hasn't already been widely discredited ?' - Dilbert

CodeDom

Akhilesh Yadav14-Jan-07 23:22

Akhilesh Yadav

14-Jan-07 23:22

I am finishing up work on a windows service that uses CodeDom to dynamically
compile code.

The problem I am running into is that the the compile fails with a
NativeCompilerReturnValue of 2000.

I assume this is probably a security issue, but I don't know where to start
looking for a resolution. Running the code as a WinForms app is not an
option.

Any suggestions would be greatly appreciated. Thanks!

cheers,
Akhilesh Yadav

DataGridview

Socheat.Net14-Jan-07 23:09

14-Jan-07 23:09

How can i display numbering in Datagridview like excel?

................

Re: DataGridview

priya_p23314-Jan-07 23:18

priya_p233

14-Jan-07 23:18

hi,

following code displays numbers in 1st column
dim col as integer
col=0
For i = 0 To Datagridview.RowCount
Datagridview.Item(col, i).value = i
Next

if this is not solution of ur answer tell me ur question in detail.

priya

Re: DataGridview

Socheat.Net14-Jan-07 23:23