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const
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SECURITY_NT_AUTHORITY: SID_IDENTIFIER_AUTHORITY = (Value: (0, 0, 0, 0, 0, 5));
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SECURITY_BUILTIN_DOMAIN_RID = $00000020;
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DOMAIN_ALIAS_RID_ADMINS = $00000220;
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function IsAdmin: Boolean;
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var
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hAccessToken: THandle;
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ptgGroups: PTokenGroups;
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dwInfoBufferSize: DWORD;
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psidAdministrators: PSID;
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x: Integer;
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bSuccess: BOOL;
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begin
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Result := False;
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bSuccess := OpenThreadToken(GetCurrentThread, TOKEN_QUERY, True,
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hAccessToken);
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if not bSuccess then
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begin
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if GetLastError = ERROR_NO_TOKEN then
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bSuccess := OpenProcessToken(GetCurrentProcess, TOKEN_QUERY,
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hAccessToken);
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end;
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if bSuccess then
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begin
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GetMem(ptgGroups, 1024);
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bSuccess := GetTokenInformation(hAccessToken, TokenGroups,
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ptgGroups, 1024, dwInfoBufferSize);
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CloseHandle(hAccessToken);
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if bSuccess then
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begin
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AllocateAndInitializeSid(SECURITY_NT_AUTHORITY, 2,
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SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS,
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0, 0, 0, 0, 0, 0, psidAdministrators);
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{$R-}
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for x := 0 to ptgGroups.GroupCount - 1 do
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if EqualSid(psidAdministrators, ptgGroups.Groups[x].Sid) then
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begin
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Result := True;
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Break;
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end;
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{$R+}
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FreeSid(psidAdministrators);
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end;
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FreeMem(ptgGroups);
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end;
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end;
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