Problem with Pro*C reading BLOB field from Oracle 10g

Question

Hello Experts,
We have a Pro*c application which is reading the BLOB data fields (a PNG image file) from Oracle data base. It holds the BLOB fields returned from the SQL query into a Unsigned Char structure in Pro*C. The program used work fine on AIX 32 – bit 4.3 and Oracle 8.1 environment.
Recently, we have upgraded the environment to AIX 64-bit 5.3 and Oracle 10g.Since after the Pro*c program has problem in reading the Blob filed.
Below is the query we are trying to execute –
EXEC SQL
SELECT
signtre_image, image_file_name_ext
INTO
:msipLocalImage INDICATOR :msipLocalImage_i,
:file_name_ext INDICATOR :file_name_ext_i
FROM
dcs_sign
WHERE
signtre_nbr = :signtre_nbr;
Here signtre_image is the BLOB fields and msipLocalImage is a Pro*C structure define as below –
typedef struct tagSignImage
long len; /* Image length */
unsigned char img[1]; /* Pointer to first byte. */
} MOTS_SIGN_IMAGE;
The quesry does not give any error or exception message in the Pro*C , program just stops at the point of executing the quesry..When we run the query commenting the BLOB filed it works fine. Also, the query runs good when we run it in the Oracle editor.
There seems to be problem with the way we are reading the BLOB field in the new Oracle 10g enviromet.
Does any body have any idea what’s wrong with this query? We really need it to work.
Any Help will be greatly appreciated.
Thanks,
- Rajan Yadav

Answer 1

Thanks a ton for your response.
We made the necessary changes as suggested by you.This time we got another flavour of error - SQL Error Code - Inconsistent error while reading BLOB.
Another thing we noticed is that the data field which we are trying to read is defined as LONG RAW instead of a BLOB in data base.
Are these two things related in any sense or is there anything else which is causing the error.
Once again Thanks for your help.
- Rajan Yadav