BindImage (Stringlist subroutine): Difference between revisions
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Revision as of 21:23, 7 February 2011
Associate a Stringlist with an image (Stringlist class)
This method associates or binds an image to a Stringlist. BindImage is a subroutine that accepts one argument, an image name, and does not return anything.
Syntax
sl:BindImage( imageName)
Syntax terms
| sl | A Stringlist object. |
|---|---|
| imageName | A string that contains the name of an image. This argument is case sensitive. That is, in the likely event the User Language was written in mixed case, with automatic upper-casing in effect, the image name should be in uppercase. |
Usage notes
- All errors in BindImage result in request cancellation.
- These methods can use the association between an image and a Stringlist:
- The association between an image and a Stringlist is generally used when all Stringlist items have the same layout as the image. Methods that create a new Stringlist usually propagate the image binding from the method Stringlist to the output Stringlist.
Examples
- Once an image is bound to a Stringlist, methods that operate on an image can omit the image name parameter. This is not only convenient from a coding perspective, it is more efficient -- no image name lookup needs to be done in NTBL.
The following example illustrates such a use of BindImage:
%list is object stringList ...
image customer
id is string len 8 lname is string len 32
end image
...
%list = new %list:bindImage('CUSTOMER')
...
for each record in %recset
%customer:id = id %customer:lname = lname %list:addImage
end for
- BindImage could also enable the Sort and SortNew methods to use the names of image items in the sort criteria rather than column numbers, for example, where a Stringlist has a layout described by an image:
%list is object stringList ...
image customer
id is string len 8 lname is string len 32
end image
...
%list = new %list:bindImage('CUSTOMER')
...
%list:sort('LNAME,A ID,D')
- It is probably quite common that one and only one image is bound to a Stringlist in a request. In such cases, the BindImage functionality can be achieved with the New method by using an image name argument on the method invocation:
%list is object stringList ...
image customer
id is string len 8 lname is string len 32
end image
...
%list = new('CUSTOMER')