ac11640_.htm |
Last updated Friday, 21 July 2017How to deal with messages that belong to the BLOB domain, and that are parsed by the BLOB parser.
You cannot manipulate the contents of a BLOB message, because it has no predefined structure. However, you can refer to its contents using its known position within the bit stream, and process the message with a minimum of knowledge about its contents.
The BLOB message body parser does not create a tree structure in the same way that other message body parsers do. It has a root element BLOB, that has a child element, also called BLOB, that contains the data.
You can refer to message content using substrings if you know the location of a particular piece of information within the BLOB data. For example, the following expression identifies the tenth byte of the message body:
InputBody.BLOB.BLOB[10]The following expression references 10 bytes of the message data starting at offset 10:
SUBSTRING(InputBody.BLOB.BLOB from 10 for 10)You can use the Mapping node to map to and from a predefined BLOB message, and to map to and from items of BLOB data.
CALL CopyMessageHeaders();
-- CALL CopyEntireMessage();
DECLARE mystring CHARACTER;
SET mystring='hello';
SET OutputRoot.BLOB.BLOB=CAST (mystring AS BLOB CCSID 1208);