Registry Read

Question

Hello All,
I wonder, is there any way to read registry entry using Oracle Stored Procedure?
Oracle DB: 11g R1
Regards,
Prazy

Answer 1

PrazY wrote:
For some of them I have googled and gone through Tom's post.
DWORD - BINARY_INTEGER
LPCTSTR - VARCHAR2
LPDWORD - BINARY_INTEGER
LONG - is it LONG in here too??
HKEY - ??
PVOID - ??? hkey = A handle to an open registry key. The key must have been opened with the KEY_QUERY_VALUE access right. Typically handles in Win32 are long (4 byte) int as far as I recall.
Pointer to a struct that can receive the data returned by the call. Should be a long pointer.
Unsure how to map these to PL/SQL types... You will need to experiment. PL/SQL itself does not explicitly support pointers. It does however have 2 pointer types. Cursors/ref cursors and LOB locators. But there is no pointer operations involved such as dereferencing for example. And you cannot really define a pointer to a string variable in PL/SQL.
However, I would expect that if you make an external proc call, all the parameters that are out values (returning data from the external call) will need to be long pointers as the ext proc interface will have to copy the return values to those memory addresses indicated by the PL/SQL variables intended to receive them.
It may be simpler though to wrap this Win32 call into a custom DLL that does the complex stuff. Opening the registry, dealing with the C data types and pointers, and in turn exposes a PL/SQL data type friendly interface that you can call via ext proc.
Writing such a DLL should be a fairly trivial exercise as this is not really a series of complex calls that need to be made, requiring complex data handling.