Lock of The Desktop

[altobji]

Dear ALL,
I'm trying to lock the Desktop from being accessed by the user unless he enter the correct Username and passswod ....

i managed to lock the desktop from being accessed by mouse ...
but the problem is that he still can use the sys. keys (as CTRL , ALT + TAB , Windows key....etc) in which i want to disable .. so only he can type letters and numbers ..... any suggestion will make me very greatful...

Thanx in advance

[j2k]

See my post here for info on blocking sys keys for the Windows 9x platform.

(Code does not work for Windows NT/2000)

HTH.

[altobji]

Thanks alot for ur concern and time....
everything is Ok except that the ALT+F4 combination is still working and it as usual cuase the applicaiton to terminate ...in which i don't wan't the user to be able to do...

any Help...
Thanks in advace

[Microbasic]

You can do that by putting this code in form_Unload:

If PasswordC = False Then Cancel = True

And put this code just before the form UNLOADS because of a correct password:

PasswordC = True

Don't forget to put this in the General_Declarations:

Public PasswordC As Boolean

[Microbasic]

Or, put this in the FORM_QUERYUNLOAD Section:

If unloadmode <> 1 Then Cancel = True

[altobji]

Thanx Microbasic for ur time...
But this way he Might Press (ALT+F4) and close the App
witout entering the correct things... and i want to prevent him from doing this

[filburt1]

In the Form_QueryUnload event, add the line Cancel = True after checking to make sure that the event was called from something OTHER than code (see the VB help for QueryUnload).

[Microbasic]

They CAN'T. Alt_F4 is just a shortcut for the CLOSE button on the caption bar. BOTH of my codes prevent the form from unloading in any way except for the Unload function, so NO USER CAN USE Alt_F4 for exiting.

[altobji]

thanx alot... yes u where wright ... thanx again....
ooh ... sorry if i would be rood... do u know about Viedo Streaming an VB .... forgive me....

[Nucleus]

The idea is to hide all the windows and display your app in maximized form.

Then even if they use ctl+alt+del they still can't get to anything. To disable ctl+alt+del in NT need to subclass it. Alternatively dirty way is to capture keypresses from a timer.

[altobji]

can u plz be more descriptive about the subclass tech. u just declared about...

[Nucleus]

Well I don't think it is possible from VB, you need C++ to create a standard dll to create a system wide hook.