i kept getting memory error ('mem could not be read') when i used the following to query a registry value:

----
r1 = RegOpenKeyEx( HKEY_CURRENT_USER, "RemoteAccess", 0, KEY_QUERY_VALUE, phkResult)
if r1= ERROR_SUCCESS then
l= 50
subkey = "myteststringval"
r2 = RegQueryValueEx( phkResult, subkey$, 0, REG_EXPAND_SZ, data, l )
'I got the above mem error when stepping over this statement and couldn't proceed
...
...
RegCloseKey(phkResult)
----

all consts and declares has been made.
can anyone give me a hint why the memory error always come up ? each time
i succeeded in opening the key but failed on the query...

thanks in advance to any help, will appreciate it.

Ying