Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

NT Service Continued....

Posted on 2001-07-07
3
Medium Priority
?
382 Views
Last Modified: 2010-04-06
I posted a question recently that was answered pretty quickly...

--- from previous question ---

http://www.experts-exchange.com/jsp/qManageQuestion.jsp?ta=delphi&qid=20145483

I had written a small monitoring program for Windows 98 and have started to convert it into a service
for NT.

So far it looks good, i've used a template from http://www.jgsoftware.com/nt.htm -> the vpcsrvce.zip and the service installs, accesses
all my modules and functions from the form and everything is great...until... i use the FindWindow command.

--- end from previous question ---

I am still working on this application, i've come accross two problems.

(1) The GetUserName function returns 'SYSTEM' always, because my service is started from the system account. Is there a way to retrieve the logged on user name?

(2) Everynow and then when logged in with a standard user account (not the account i installed the service from) i get a message box popping up saying 'The operation completed successfully' with the title 'GetLastError'. I know this is coming from the standard uService.pas routines but i'm not sure where from.... so how can i get rid of these popups?

Thanks.
0
Comment
Question by:frangers99
3 Comments
 
LVL 13

Accepted Solution

by:
Epsylon earned 800 total points
ID: 6262360
(1)

A rough example of impersonating the logged-in user in a service:

function GetCurrentUser: String;
var h: HWND;
    dwProcessId: DWORD;
    hProcess, hToken: THandle;
    a: array[0..255] of Char;
    s: Cardinal;
begin
  h := FindWindow('Progman', nil);
  GetWindowThreadProcessId(h, @dwProcessId);
  hProcess := OpenProcess(PROCESS_ALL_ACCESS, FALSE, dwProcessId);
  OpenProcessToken(hProcess, TOKEN_ALL_ACCESS, hToken);
  ImpersonateLoggedOnUser(hToken);
  s := sizeof(a);
  GetUserName(a, s);
  Result := a;
  RevertToSelf;
  CloseHandle(hToken);
  CloseHandle(hProcess);
end;


Maybe you can try

  h := GetDesktopWindow;

instead of

  h := FindWindow('Progman', nil);


(2)

Remove some writeln's...
0
 

Author Comment

by:frangers99
ID: 6311097
i tried the get user name function.... havent thoroughly tested it yet, but seems to work fine. I still can't track down that GetLastError msg.

One other problem... how do you make an attempt to close the main form the same as trying to close the process (ie like every other delphi application!)
0
 
LVL 26

Expert Comment

by:Russell Libby
ID: 8702565
No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:

Accept Epsylon's comment as answer

Please leave any comments here within the next seven days.
 
PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!
 
Thank you,
Russell

EE Cleanup Volunteer
0

Featured Post

Important Lessons on Recovering from Petya

In their most recent webinar, Skyport Systems explores ways to isolate and protect critical databases to keep the core of your company safe from harm.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

The uses clause is one of those things that just tends to grow and grow. Most of the time this is in the main form, as it's from this form that all others are called. If you have a big application (including many forms), the uses clause in the in…
Introduction I have seen many questions in this Delphi topic area where queries in threads are needed or suggested. I know bumped into a similar need. This article will address some of the concepts when dealing with a multithreaded delphi database…
Are you ready to place your question in front of subject-matter experts for more timely responses? With the release of Priority Question, Premium Members, Team Accounts and Qualified Experts can now identify the emergent level of their issue, signal…
In a question here at Experts Exchange (https://www.experts-exchange.com/questions/29062564/Adobe-acrobat-reader-DC.html), a member asked how to create a signature in Adobe Acrobat Reader DC (the free Reader product, not the paid, full Acrobat produ…
Suggested Courses

916 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question