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Screenshot from a XP / 2000 service program

Posted on 2006-11-05
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Last Modified: 2008-03-15
Hi,

I need to take a screenshot FROM A XP/2000 SERVICE.  When I take the screenshot from a normal program it works fine (using any of the differents codes available in internet), but using that code from a service program is not working (I only get a white screen).

Not sure if it helps, but:

I'm using getdc(0) to get the desktop handle; looking code written in C, I notice that a working code use getdc(null), but I cannot use that in delphi because it generates an  "could not convert variant of type (Null) into type (int64)" error.

As far as I can imagine, my problem is that I get the handle to the current user desktop, not the "real" desktop, so the function called from a regular application works well, but from a service program (system user) it fails...

Remember, take a normal screenshot from a normal application is not the problem, but using the same code in a xp/2000 service application.

Thanks in advance...
ps. sorry for my bad english
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Question by:jcanonmercado
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Expert Comment

by:TName
ID: 17879877
Works for me with GetDc(0)...
(ServiceType stWin32, Interactive is true)
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LVL 28

Expert Comment

by:TName
ID: 17879943
You could also try something like this:

aCanvas := TCanvas.Create;
aCanvas.Handle := GetWindowDC(GetDesktopWindow);
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Author Comment

by:jcanonmercado
ID: 17883496
OK, maybe I wasn't clear enough...

I'm trying to make a remote control program, and it works... except on logon screen...

When in windows logon screen, my service application comunicates well, I have responses of all request I made, but I can't get a screenshot at this moment...if the service is allowed to interact with desktop I can get screenshots when the user log in... but not in logon screen...

I know this is possible because some remote control programs can do that (when in service mode...)

Any ideas?

tkanks...
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