$ListImg: Difference between revisions
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<li>[ | <li>[http://m204wiki.rocketsoftware.com/images/4/4a/JoclrNew.pdf Janus Open Client]</li> | ||
<li>[[Janus Open Server]]</li> | <li>[[Janus Open Server]]</li> | ||
<li>[[Janus Sockets]]</li> | <li>[[Janus Sockets]]</li> | ||
Revision as of 23:44, 12 September 2013
Associate an image with a $list
Note: Most Sirius $functions have been deprecated in favor of Object Oriented methods. The OO equivalent for the $ListImg function is BindImage.
This function returns a 0 indicating that the image has been associated with the $list or a negative number indicating that an error has occurred.
The $ListImg function accepts two arguments and returns a numeric result. It is a callable $function.
The first argument is a $list identifier. This is a required argument.
The second argument can be a string containing the name of an image, or it can be any image item from the required image. This is a required argument.
Syntax
[%RESULT =] $ListImg(list_identifier, image_id)
%result is a string that contains a 0, or it contains a negative number if an error has occurred.
Error codes
-5 - Required argument not specified -6 - $List identifier invalid -8 - Image not found
Usage notes
- Suppose there is an image with the following description:
IMAGE SALES ITEM IS STRING LEN 16 ID IS STRING LEN 8 PRICE IS BINARY LEN 4 END IMAGE
One can associate this image with the $list %LIST with:
%RC = $ListImg(%LIST, 'SALES')
or
%RC = $ListImg(%LIST, %SALES:ID)
While the latter is syntactically inefficient (:ID is superfluous), it is more efficient because the image name hashing and lookup is done at compile time rather than evaluation time.
- Functions that can use the association between an image and a $list are:
- The association between an image and a $list is an association between the image and the particular $list identifier value. A $ListMove does not change the image association of the target $list, and the image association of a $list is not saved or restored with $ListSav and $ListRst.