ColdFusion Image Manipulation Functions Return Nothing
Posted April 24, 2008 at 9:18 AM
I have been fooling around with some dynamic image method execution when something I already knew suddenly occurred to me in a different way - ColdFusion image manipulation functions return "Nothing". And, I don't mean that they simply don't return the resultant image object - I mean, just as the documentation states, they return "Nothing" - void. When I realized this, I started to look at all the other ColdFusion methods that don't echo back their primary argument and I realized that it is very hard to find other methods that return Nothing. All of the array and struct methods return true or false depending on success of execution; all the query manipulation methods return properties based on the actions; all other functions return actual values.
Are ColdFusion image manipulation functions the only built-in methods that return no value? And, if so, I wonder why these functions do this?
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Reader Comments
Hmmmm ... you may be right, Ben. Never thought about it, but even the functions I normally use as if they returned nothing, do actually return Boolean. Like the query functions, which I normally don't even assign to anything:
<cfset queryAddRow(myQry)>
<cfset querySetCell(myQry, "myCol", myVal)>
They can just as well be used as:
<cfset rowTest = queryAddRow(myQry)>
<cfif rowTest>
<cfset colTest = querySetCell(myQry, "myCol", myVal)>
<cfelse>
<cfthrow message="Could not add a row to '#myQry#' for some reason">
</cfif>
Interesting.
Posted by jfish on Apr 24, 2008 at 10:06 AM
@JFish,
Yeah, when I realized this, I would like, Oh let me go check out things like QueryAddRow() cause those have no return value... but then, it turns out they did.
Posted by Ben Nadel on Apr 24, 2008 at 10:09 AM
