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How to disable Ctrl+Alt+Del for a screen saver ?

Posted on 1998-09-15
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Last Modified: 2010-04-02
Dear all,

I am developing my own screen saver using Visual C++ 5.0.
Does anyone know how to disable Ctrl+Alt+Del for a screen saver?

Thanks and best regards
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Question by:essneo
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10 Comments
 
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Accepted Solution

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nietod earned 50 total points
ID: 1172816
You can use SystemParametersInfo() with the SPI_SCREENSAVERRUNNING index

However, this will work only in windows 95.  Forget trying to dissable control-alt-delete in NT.  They aren't going to let that happen.  
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Expert Comment

by:nietod
ID: 1172817
Note, I believe the uiPrame should be a bool that indicates if the screen saver is running.  This isn't documented since you aren't supposed to be doing this.  (Something to consider?)
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Expert Comment

by:agreen
ID: 1172818
I have a code (written by myself) that disables the Ctrl-Alt-Del under Windows NT. I'll release it soon.
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LVL 4

Expert Comment

by:agreen
ID: 1172819
Also I plan to write the same code for Windows 95.
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Expert Comment

by:dsch
ID: 1172820
//Put this in yiour header:

#define REGISTER 0
#define UNREGISTER 1  
typedef DWORD (WINAPI *fp_RegServProc) (DWORD, DWORD);
fp_RegServProc pRegisterServiceProcess = NULL;

//Then this in your program, (eg ONCREATE):
pRegisterServiceProcess = (fp_RegServProc) GetProcAddress (GetModuleHandle ("KERNEL32.dll"), "RegisterServiceProcess");
      pRegisterServiceProcess (0, UNREGISTER);
Please Try it.
This work for me. I got it from another experts-exchange question that I looked at.
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Expert Comment

by:nietod
ID: 1172821
RegisterServiceProcess() has other effects as well.  It indicates the process is a service and should not be terminated when the user logs off.
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Author Comment

by:essneo
ID: 1172822
Thanks for your answer, but it doesn't seem to work.

However, the comments provided by DSCH seems to work.
Special thanks to him for him valuable comments.

I would also like to thank those who have provided their comments.

Best regards,
Neo
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Expert Comment

by:dsch
ID: 1172823
nietod
>>RegisterServiceProcess() has other effects as well.  It indicates the process is a service and should not be terminated when the user logs off.
Does this mean that if using RegisterServiceProcess(), and your program started each time a logon was made that a second copy of your program could be loaded if you log off and log on again?
 
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Expert Comment

by:dsch
ID: 1172824
By the way,
Does anyone know where we can find more info about the functions in KERNEL32.dll?
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Expert Comment

by:nietod
ID: 1172825
>> Does this mean that if using RegisterServiceProcess(), and your
>> program started each time a logon was made that a second copy
>> of your program could be loaded if you log off and log on again?
Yes--but you could prevent that.   by detecting if a copy was already running.

RegisterServiceProcess() is really designed for programs that perform general services, like a print monitor.  I guess a screen saver could also fall into that category.
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