Question

Run app with elevated privileges for Vista's UAC in Delphi 2009

Asked by: light_bulb

I'm trying to launch another application from my application, and I need the app I'm launching to have elevated privileges for UAC in Vista.

The code I use below worked in D2007, but now it won't work in D2009.  I get the following error:

"System Error.  Code:_1155.  No application is associated with the specified file for this operation."

I had to make a couple of changes for D2009 that I've noted in the code below.

Any ideas on how I can run the app with elevated privileges in Vista?  Is there an easier way of doing this?

RunFileAsAdmin(Handle, IncludeTrailingPathDelimiter(ExtractFilePath(ParamStr(0))) + 'rfWebUpdate.exe', '')
 
 
procedure RunFileAsAdmin(hWnd: HWND; aFile: string; aParameters: string);
var
  sei: TShellExecuteInfoA;
begin
  FillChar(sei, SizeOf(sei), 0);
  sei.cbSize := SizeOf(sei);
  sei.Wnd := hWnd;
  sei.fMask := SEE_MASK_FLAG_DDEWAIT or SEE_MASK_FLAG_NO_UI;
  sei.lpVerb := 'runas';
  sei.lpFile := PAnsiChar(aFile); //this was PChar in D2007
  sei.lpParameters := PAnsiChar(aParameters); //this was PChar in D2007
  sei.nShow := SW_SHOWNORMAL;
  if not ShellExecuteEx(@sei) then
    RaiseLastOSError;
end;

                                  
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Asked On
2009-09-24 at 07:36:34ID24758603
Topic

Delphi Programming

Participating Experts
2
Points
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Comments
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Answers

 

by: JohnjcesPosted on 2009-09-24 at 08:02:57ID: 25414070

One of the first things I noted was lpDirectory was missing and that "could" affect how D2009 tries to find the file. An entire string with path and all in lpFile "should" work.

I use the class TShellExecuteIInfo and not the TSHellExecuteInfoA which has smoe subtle differences.

Try just the file name and in lpFile and put the full path in lpDirectory and see what happens. Maybe change your class too.

Hope this helps... just my .02 cents!

John

 

by: ThievingSixPosted on 2009-09-24 at 09:08:14ID: 25414885

Since your using 2009 now switch to TShellExecuteInfo(more commonly known as TShellExecuteInfoW), with PChars(PWideChars). With the error you provided I'm guessing that the file you wanted to open has no application registered with it. If it's an exe file.

Also, according to http://msdn.microsoft.com/en-us/library/bb759784%28VS.85%29.aspx, "runas" isn't a viable verb.

 

by: light_bulbPosted on 2009-09-24 at 09:15:55ID: 31633016

Switching to TShellExecuteIInfo made the difference - I then switched back to just PChars - worked great!

Thanks!

20120131-EE-VQP-002

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