How to get the owner of a file ?

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Author:
Gustav Evertsson
Ratings: 0, Votes: 0
// When you create a file or directory, you become the owner of it.
// With GetFileOwner you get the owner of a file.
function GetFileOwner(FileName: string; var Domain, Username: string): Boolean;
var
SecDescr: PSecurityDescriptor;
SizeNeeded, SizeNeeded2: DWORD;
OwnerSID: PSID;
OwnerDefault: BOOL;
OwnerName, DomainName: PChar;
OwnerType: SID_NAME_USE;
begin
GetFileOwner := False;
GetMem(SecDescr,1024);
GetMem(OwnerSID,SizeOf(PSID));
GetMem(OwnerName,1024);
GetMem(DomainName,1024);
try
if not GetFileSecurity(PChar(FileName),
OWNER_SECURITY_INFORMATION,
SecDescr,1024,SizeNeeded) then
Exit;
if not GetSecurityDescriptorOwner(SecDescr,
OwnerSID,OwnerDefault) then
Exit;
SizeNeeded := 1024;
SizeNeeded2 := 1024;
if not LookupAccountSID(nil,OwnerSID,OwnerName,
SizeNeeded,DomainName,SizeNeeded2,OwnerType) then
Exit;
Domain := DomainName;
Username := OwnerName;
finally
FreeMem(SecDescr);
FreeMem(OwnerName);
FreeMem(DomainName);
end;
GetFileOwner := True;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
Domain, Username: string;
begin
GetFileOwner('YourFile.xyz',domain,username);
ShowMessage(username + '@' + domain);
end;

// Note: This only works under NT.