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groupitvn wrote: How can i lock Ctrl+Alt+Del Keys (do not show task manager) ?
You can't.
And how can i hide my desktop screen (such as screensaver) by my program ?
What do you mean? Do you want to keep the screen saver from starting? Or whatever you want to hide, what do you want to show instead?
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Guffa wrote: You can't.
Actually, you can.
See: http://www.codeproject.com/win32/AntonioWinLock.asp[^]
Ctrl+Alt+Del
There are several ways to disable this key combination:
1. Disable Task Manager. This doesn't trap the key combination, it simply disables the application (Task Manager) that pops up when this key combination is pressed. See below how to do this.
2. Trap the keys using a keyboard device driver. For this, you need the DDK installed. I will not describe this method here.
3. Write a GINA stub. GINA is the DLL that Winlogon uses to perform user authentication. I'm not going to discuss this method here, but you can find out how to do it here [16].
4. Subclass the SAS window of the Winlogon process. For this, you must inject code into the Winlogon process and then subclass its Window Procedure. Two techniques for doing this are described later.
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There go my people. I must find out where they are going so I can lead them.
- Alexander Ledru-Rollin
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I stand corrected. I truly believed that this wasn't possible, for security reasons.
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Oh come on!! In Guffa's defense, there is no REASONABLE way to do it. 
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Dave Kreskowiak wrote: there is no REASONABLE way to do it
Disabling Ctrl+alt+Del is unreasonable, sure. But changing a single registry setting so that the task manager cannot come up is quite simple.
Original Question: How can i lock Ctrl+Alt+Del Keys (do not show task manager) ?
HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System\DisableTaskMgr
But hey, I'm still a freshman compared to you and Guffa - so forgive me if I take every opportunity to correct my superiors.
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There go my people. I must find out where they are going so I can lead them.
- Alexander Ledru-Rollin
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EricDV wrote: Disabling Ctrl+alt+Del is unreasonable, sure. But changing a single registry setting so that the task manager cannot come up is quite simple.
I was just commenting on disabling Ctrl-Alt-Del, nothing more.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Dave Kreskowiak wrote: I was just commenting on disabling Ctrl-Alt-Del, nothing more.
:->
I understand. I'm new to the developer forums, so I'm just figuring out how things work.
I've seen your posts, and I'm impressed with your knowledge. I hope my etiquette has not been rude or inappropriate.
I just wanna be friends. 
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There go my people. I must find out where they are going so I can lead them.
- Alexander Ledru-Rollin
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EricDV wrote: I hope my etiquette has not been rude or inappropriate.
Nope, not at all. 
Dave Kreskowiak
Microsoft MVP - Visual Basic
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I am working in MDI environment. The problem is on click on MDI close box. I am asking user. "if he is sure to close the application " yes or no.. now the child forms which are open also triggers the closing event even before the MDI closing event no matter user say "he dont want to close the application ". So the code on the closing of child executes which I dont want to execute until unless it is really closing.
Note: Child form does not close if user selected to continue with app. but code on closing is executed.
Regards
Rizwan Bashir
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Assuming you are working with Visual Studio 2005, have you looked at the value of the CloseReason property in the MDI childrens FormClosing events? Maybe if the value is MDIFormClosing or FormOwnerClosing you can have conditional code to skip the FormClosing event code unless you know the MDI form has really closed (via some flag).
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Sorry I forgot to mention 2003.
Regards
Rizwan Bashir
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Hello
I want to upload a pdf file for my help page. i'm able to upload the pdf file but the problem is that how would i show the contents of pdf file in a page.
help file extension will be .html.
hope to get some Reply
bye
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how can i read and add items from notepad and print them to listview in form vb.net
kilany
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You mean how can you read a text file ? Notepad has nothing to do with it, it's just a program that reads text file. System.IO.File.ReadAllText is the easiest way to read a file.
Christian Graus - Microsoft MVP - C++
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i send message from vb.net to another application .. the send operation is done successfully but the problem is some times the message change by adding a character or repeat character such as if :
dim s as string ="42945:dn"
send.sendwait(s)
the message will print as 42945:dn but some time will print in the another application 442945:dn and some time 442294::dn really i dont know why ...
some friend advice me to use Trim function but i dont know if it will do as i want or no...
please this is the 15 time that i ask you to help me and give me the function that keep the string as i defined it before send it to another application but unfortunatlly no answer ..
keep me in ur mind.
kilany
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This is absolutely the LAST time I'm going to say this. THERE IS NOTHING WRONG WITH THE CODE!! You're using SendKeys to send this data to another application, which is notoriously unreliable! The value of the variable is NOT changing when you call SendKeys. The problem is that your destination application isn't cooperating with SendKeys! Is there anything you can do about it?? Short of seeing if you can get an updated version of the target application, no, there isn't...
Dave Kreskowiak
Microsoft MVP - Visual Basic
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BUT THIS PROBLEM WILL BE ALSO IF THE DESTINATION IS NOTEPAD PLEASE TRY TO USE SEND() FUNCTION BETWEEN MINIMIZE AND MIXIMIZE THE WINDOW THEN YOU WILL FIND SOME THING BUFFER OR SOME THING CHANGE LESS OR MORE CHARACTER WILL ADDED TO THE ROOT STRING ... SO THE PROBLEM NOT THE DISTINATION BECAUSE I USE THE FUNCTION IN MANY TARGET APPILCATION ...
I THINK THE PROBLEM IS THE DELAIY .. I NEED TO KNOW HOW I CAN DELAIY THE FORM WHEN I MINIZE IT .. THIS IS THE LAST CHANCE TO USE IT ...BECAUSE THE PROBLEM THAT IT PRINTS ALL STRING IN SMALL PERIOD LESS THAN 1 SECOND
kilany
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If you can't send keys to Notepad properly, I'd say you have a problem with your system. notepad is nothing but a glorified TextBox control.
During this entire time, you never once mentioned WHY your trying to control another application and even WHAT that application is. I've already said that you have to look for other methods that are reliable, like an SDK or COM component for that application. Now, you've just about run out of time to look...
Dave Kreskowiak
Microsoft MVP - Visual Basic
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There is no level on which you can send one number and recieve another. It's got to be the way in which the number is being handled in code. What's send ? Are you using WM_COPYDATA to send stuff between applications ? If not, what are you using ?
Christian Graus - Microsoft MVP - C++
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The mother of all f-up's: SendKeys
Dave Kreskowiak
Microsoft MVP - Visual Basic
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more details .... pls if you have a soluation of my problem just tell me where and how can i search by google .. and about what ...
kilany
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I use a usually string character or number but the problem that randomlly after some click on button which make send string ,, the send() function add or remove some character or number ... so how can i delay the message according to time .. that mean i think i should not print all the message one time..
kilany
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As you may have noticed by the discussion that happened around this question, what you're doing is just plain terrible. It's just not the right way to go. You have options that are sensible, mainly the ones I listed when I asked. You never answered, BTW, without Dave's comment I'd be even less able to help you. The best help I can offer is to scrap what you're doing, and do it properly.
Christian Graus - Microsoft MVP - C++
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