Problems porting application from V6 to V7

I have some problems with Oracle 7 proc version 1.5:

I'm porting an application running on ORACLE 6 compiled with proc version 1.4 This application stores graphic data in LONG RAW columns for a performant access to graphic data.

1.

I get error ORA-2114 when doing SQL COMMIT or doing an insert into a table with LONG RAW column. Both was working with proc 1.4. I can't find error message ORA-2114 in the manuals. There exists a runtime error RTL-2114 but i can't detect any context to the actions i do in the software.

2.

How can I access LONG RAW columns when i only want to read part of the possible 2 Gigabyte. For example: Read or write 2048 byte beginning at offset 4096.

3.

Generally the description of the handling of RAW columns in the manuals is not satisfying. I'm looking for examples how to use BIND DESCRIPTORS when reeading or writing LONG RAW data.

Bye Peter ;-)

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                            Peter R. Messerer    SNI BU ES GIS 42
                            e-mail: peter.messerer_at_mch.sni.de
                            Raum 3711  Tel.: (0041)(89)636-43937