//
//	UsernameToSid
//
//	Convert username to a SID
//
#include <windows.h>

//
// Return the SID of specified user account
//
PSID GetUserSid(LPCTSTR szUserName)
{
	SID		*sid = 0;
	TCHAR	*dom = 0;

	DWORD	sidlen = 0;
	DWORD	domlen = 0;

	SID_NAME_USE snu;

	//
	// with no machine specified, LookupAccountName looks up user's sid in
	// following locations:
	//
	// well-known, built-in, local-machine, primary-domain, trusted-domain
	//
	while(!LookupAccountName(NULL, szUserName, sid, &sidlen, dom, &domlen, &snu))
	{
		if(sid) free(sid);
		if(dom) free(dom);

		if(GetLastError() != ERROR_INSUFFICIENT_BUFFER)
			return 0;

		sid = malloc(sidlen);
		dom = malloc(domlen);
	}

	printf("domain: %s\n", dom);

	free(dom);
	return sid;
}
</script>