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There is no such thing as a Session in a desktop app.
You can create your own implementation of this though. Your logins would have to be stored in a database of some kind. Off the top of my head, the application sends the username and password to your server code when it is authenticated. If it passes authentication, it sends back a GUID that is also logged into the database as being an active login.
Once you have that data, your other app can request all the active logins from the database.
Your server code will also have to implement a logout method to remove the GUID passed to the client. The client could just pass the GUID to let it know it wants to log out.
Your server code will also have to maintain the active login database by clearing out stale records where a timeout value has expired. Theis prevents the database from being loaded up with dead login data where the client logged in, but never logged out for some reason.
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Hi Dave
Thanks a lot for your reply.
I was supposing that session stuff doesn't require any interwork with db. If I store into the DB my loggin state it's much easer but it doesn't sound as implementation of session functionality either.
Please forgive me, I suck as designer, but I supposed that session functionality allows the user to keep available information without accessing to the DB.
Regarding timeout, how can I keep track of inactive users logged in my DB without a session mechanism ?
I suppose that I should implement a sort of tread which performs a continuos scan of users table.
Honestly, I'm a bit surprise because I belived that to start a session from 1 side using a webreference class which set 'session("my_session")=1' was enough.
The other desktop application use another webreference class which can read the state of a specific session if this way
'if session("my_session")=1
return true
Most probably session mechanism works very differently of my understanding
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ilgrongo wrote: I belived that to start a session from 1 side using a webreference class which
set 'session("my_session")=1' was enough.
Desktop apps have no such concept as a "session". They only exist in web applications (ASP.NET) and that mechanism can be used by web services to manage session state.
For a web service, sessions do exist. But, session data (and the "Session" object) only exist in the server-side code. The desktop application cannot reference Session at all.
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Thanks again Dave
Sorry It was my fault, sometime I can't express myself properly.
So far,I didn't write a single line of code desktop side trying to manage session, modificate session data and so on.
What I'm struggling with is just the retriving of session information from server side to be used.
On desktop side I'm writing code like this:
Dim webConsumer As New localhost.WebService1
If webConsumer.checkSession(userid) = 1 Then
.....do something.........
Where webConsumer is the instance of object WebService1
Thanks a lot
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WITHOUT using msgina.dll or any DLL file / hooks... Is there a way to disable CTRL ALT DEL keys and the Win Key ?
The app im working on now has a timer to keep it ontop. it is password enabled to both lock and unlock it so random kids cant lock or unlock the PC without the password. i made the app so it can not be shutdown with the ALT+F4 keys, it is borderless, and FILLS the whole screen.
This Program would be a big hit on my website.
ill give credit to all that help in the code if asked.
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There is no way at all to disable Ctrl-Alt-Delete. And Windows already has a lock screen built into it that will always be more secure that your app.
In order to disble the Windows key, you'll have to write a global keyboard hook. There's tons of examples of this all over the web, you need only to Google for "VB.NET keyboard hook" to find them.
BTW, the keyboard hook trick will NOT work for Ctrl-Alt-Del.
Windows Vista and 7 do not use GINA. GINA was retired with Windows XP and a new model was put into place that offers more flexibility and extensibility, called Credential Providers.
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yes i agree with you... "Windows already has a lock screen built into it that will always be more secure that your app." but i want a program that acts almost the same but allows me to run programs . windows 7 lock on my PC will not allow me to run some of my programs while its in use. im goal is to make an app to allow me to run program and act in place of windows lock.
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Unless your descriuption is missing a crucial little detail, the Lock Screen doesn't prevent your apps from running at all. You can run anything you want, then lock Windows whenever you want. The only exception to that would be some games.
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Member 8768189 wrote: The app im working on now has a timer to keep it ontop. it is password enabled to both lock and unlock it so random kids cant lock or unlock the PC without the password. i made the app so it can not be shutdown with the ALT+F4 keys, it is borderless, and FILLS the whole screen.
If it's used to protect your environment against kids, then by all means, simply use the account-control that comes with Windows. It provides in a safe password-storage and a safe environment.
These type of questions often benefit from additional background-information, such as the version of Windows that you're targetting. If you're merely looking for your own environment then open your own desktop[^].
Bastard Programmer from Hell 
modified 16-Jun-12 17:11pm.
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404 Alert!
The difficult we do right away...
...the impossible takes slightly longer.
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tx 
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ill give it a try. Thank you. 
im going to attempt to make my own environment and see how that works out. ive never tried that so any tips would be great and thank you for your GREAT idea
i want this app for myself and many many others and its to keep all people off not just kids.
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Member 8768189 wrote: i want this app for myself and many many others and its to keep all people off not just kids.
Even for adults; the best way to secure the desktop is by using the built-in provider.
It's fun to play with alternatives to the default logon, but it doesn't make it more secure. I'd be in that system before you finished peeling a banana.
Bastard Programmer from Hell
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How would i go about using the built-in provider?
I have Windows 7 and if i can use this app to do something like what your talking about then how would i go about doing it?
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I was talking about the standard Windows-7 logon-screen; you can create users in Windows, and it'll do the verification for you.
Bastard Programmer from Hell
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Member 8768189 wrote: This Program would be a big hit on my website.
How exactly would it be able to lock the PC if it's web based?
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I think he's talking about distributing the thing on his web site.
One minor little flaw in his marketing plan. For something seemingly simple in functionality, why don't you see this kind of app all over various web sites already??
There's probably a reason for it...
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its not web based. Sorry if i made it seem as if it was ... when i said app i ment it as in application ... if thats what threw you off.
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not web based i ment app as in application
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From your comments, I conclude that you want to get Windows 7 to work in "Kiosk mode". Google that expression, and you'll find some links.
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yes  THANK YOU i was not sure how to do it or if it was possible but yes i looked up "Kiosk mode" that is Exactly what i was looking to make
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yes THANK YOU i was not sure how to do it or if it was possible but yes i looked up "Kiosk mode" that is Exactly what i was looking to make
[SOLVED]
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a long long way trying to get picture file size when loaded into application, now i got something close enough.
i convert image into [byte]() like this,
Dim imgSize As [Byte]() = Nothing
imgSize = DirectCast(Me.imgView.EditValue, Byte())
MessageBox.Show(imgSize.GetLength(0).ToString())
yes i have the value in byte, however the value != from the file windows properties, and yes always bigger.
did i miss something or wrong way? 
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That depends on what you mean by "get picture file size when loaded into application".
A Bitmap object will always represent an image in memory as 32-bits per pixel (R, G, B, A). Images on disk can be of varyious formats and compressions, so there is no relationship at all between the image size in memory and the file size of the image on disk.
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I may be missing some subtlety here but why don't you get the file size directly?
Dim Info = My.Computer.FileSystem.GetFileInfo("filepath")
Dim FSize = Info.Length
Label1.Text = FSize
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