Visual Basic

Henry Minute3-Aug-09 1:58

Henry Minute

3-Aug-09 1:58

Buy a copy of GoToMyPC.

Henry Minute

Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”

JasonD_S3-Aug-09 1:59

3-Aug-09 1:59

I may be new to these forums, but I'm pretty sure that you will struggle to get help with that question. Even if your own intentions are honest, I'm not calling into question the legitimacy of your own project. But others that view these boards might not have the same things in mind.

Dave Kreskowiak3-Aug-09 2:07

Dave Kreskowiak

3-Aug-09 2:07

You're going to have to precisely define what you mean by "access that program by internet". What does the app do?? Where do you want the code to run?? Do you want it to run on the server and just expose a user interface acrossed the internet, or do you want to download the app to the local machine and run it there??

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

Paramu19733-Aug-09 4:26

Paramu1973

3-Aug-09 4:26

Hi Dave,

By the help of you & mr.Johan I have completed this small project. But I have 3 more users located in different place. Not in LAN. Now my intention is, those users has to connect with my server, and through this program, they have to give entries and feed their data's.

For that what I have to do? Can you provide any samples to learn?

ThankYou Smile | :)

Paramu19733-Aug-09 4:40

Paramu1973

3-Aug-09 4:40

No need to download anything, just they have to connect with my server & run my program.

ThankYou

How I fill different image boxes through a loop VB.NET

Dave Kreskowiak3-Aug-09 7:48

Dave Kreskowiak

3-Aug-09 7:48

And what sort of services does this server expose? Is it a file server, web server, SQL Server, ftp server, ... What does this server host that the clients need to connect to??

If your app is already installed on these remote clients and you need them to connect to a SQL Server on your end, you need to expose the SQL Server using different methods other than normal access. Exposing an SQL Server directly to the internet is as about as safe as dousing it in gasoline and lighting a match.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

athinaix3-Aug-09 0:45

athinaix

3-Aug-09 0:45

Hi all,

I am newbie in vb.net and I have a simply (I think) quenstion.

I have tree Pictures Boxes and I want when the user clicks the button the first time the PictureBox1 to be filled and when the user clicks for the second time the PictureBox2 to be filled and so on.

I have succeed to doing that using if statement and I was wondering if I could do that by using a loop.

Thank you in advance

Re: How I fill different image boxes through a loop VB.NET

Johan Hakkesteegt3-Aug-09 1:37

Johan Hakkesteegt

3-Aug-09 1:37

You could, but why would you want to?

If the reason is that you want a lot more pictureboxes than just 3, then it will be easier to create and place a new picturebox each time the user clicks the button.

My advice is free, and you may get what you paid for.

Re: How I fill different image boxes through a loop VB.NET

Henry Minute3-Aug-09 1:38

Henry Minute

3-Aug-09 1:38

Why would you need a loop?

If you wanted to fill all three pictureboxes every time the button was clicked, a loop might be useful, but not for individual fills.

Re: How I fill different image boxes through a loop VB.NET

athinaix3-Aug-09 1:49

athinaix

3-Aug-09 1:49

I was thinking to avoid to write the same thing three times.
For example I am imaging that it could like the following:

for (i=0, i<3, i++)
PictureBoxi.Image = CropBitmap(GetWindowPicture(PictureBox2.Handle.ToInt32), 100, 100, 50, 50)
so the first time the result would be

PictureBox1.Image = CropBitmap(GetWindowPicture(PictureBox2.Handle.ToInt32), 100, 100, 50, 50)

the second

PictureBox2.Image = CropBitmap(GetWindowPicture(PictureBox2.Handle.ToInt32), 100, 100, 50, 50)

and the third time

the second

PictureBox3.Image = CropBitmap(GetWindowPicture(PictureBox2.Handle.ToInt32), 100, 100, 50, 50)

May I accomplised that in VB.NET, to create the full name of the Picturebox using a variable?

Re: How I fill different image boxes through a loop VB.NET

Henry Minute3-Aug-09 1:56

Henry Minute

3-Aug-09 1:56

athinaix wrote:
to create the full name of the Picturebox using a variable

I'm afraid not.

You could put the pictureboxes into a collection and get at each like:

Dim activePicBox AS PictureBox = myPBCollection(i)

Re: How I fill different image boxes through a loop VB.NET

dan!sh 3-Aug-09 2:24

dan!sh

3-Aug-09 2:24

May be like this(in C#):

((PictureBox)(this.Controls["PictureBox"+i.ToString()]).Image

Not sure if doing things like these are recommended.

It's not necessary to be so stupid, either, but people manage it. - Christian Graus, 2009 AD

Test For Null

JasonD_S3-Aug-09 0:12

3-Aug-09 0:12

I am looking to retrieve a value from an existing file and copy it to a new one, for the sake of a header. The value is a date. I am using a mix of old and new files, some have the information I need and it has to be copied to the new file, some older files don't and new data will need to be written in it's place to the header.

The question is, can I use ->

If ('Old Chicken' Is Nothing) Then
'Fill the freezer'
Else
'Put Old Chicken In New Freezer'
End If

Or would it be sesible/is it acceptable to ->

Try
'To put old chicken in new freezer'
Catch As Exception
'Call it quits and just fill the freezer'
End Try

Any help would be greatly appreciated.

dan!sh 3-Aug-09 0:21

dan!sh

3-Aug-09 0:21

The if/else approach. What if you get an exception in the try block? (Not because Old chicken is nothing but some other reason)

It's not necessary to be so stupid, either, but people manage it. - Christian Graus, 2009 AD

JasonD_S3-Aug-09 0:39

3-Aug-09 0:39

Good good. I'm pretty new to programming and VB especially. I'm just worried that the if/else would just throw an error if the object I was trying to acquire did not exist at all and wasn't just empty. Thus the code would exit anyway, the try/catch would solve this. But yes, I take your point, if there was any other error in this snippet, it would be rather sidelined.

dan!sh 3-Aug-09 1:01

dan!sh

3-Aug-09 1:01

Best would be to use if/else inside try/catch.

It's not necessary to be so stupid, either, but people manage it. - Christian Graus, 2009 AD

[Message Deleted]

Johan Hakkesteegt3-Aug-09 1:05

Johan Hakkesteegt

3-Aug-09 1:05

[Message Deleted]

JasonD_S3-Aug-09 1:15

3-Aug-09 1:15

Maybe I should reword my question... All these answers are helpful (as a n00b anything that helps me learn is a good thing, so thanks).

But when I test for the is MyChicken = 'null' (or similar), I get a NullReferenceException. I'm guessing because the old files header does not include a reference to the 'Chicken' I seek, so it looks for the chicken doesn't find it and exits code, saying it's not there, not even bothering to check for it's 'nullness'.

I guess I mean...

If MyChicken is there at all
'Put it in the freezer'
Else
'Create a chicken and put in in the new freezer'
End If

If you'll excuse all the poultry references.

Johan Hakkesteegt3-Aug-09 1:28

Johan Hakkesteegt

3-Aug-09 1:28

You're on the right track though.

The best way to go is to start of with the Try Catch block and MsgBox(ex.ToString) in the Catch clause. Turning on line numbers in your code editor is also a good idea.

Then when you get these NullReferenceExceptions, you'll know exactly which object is causing the error.

Next thing is combining checks, on separate lines, so that you always first check for Is Nothing, and only then for anything else like null or empty strings, etc.

My advice is free, and you may get what you paid for.

JasonD_S3-Aug-09 1:55

3-Aug-09 1:55

Thanks for the proTip. I'm testing the object key for 'is nothing', I figured it would be the best place to start, this is where I get the error, on the first line of said conditional (if null etc...).

I have since discovered .contains, useful. Having jumped from C++/C all these VB short cuts and lack of pointers is giving me much fun/joy/sarcasm. Thanks for all your help though guys, there are some good snippets there.