Returns a logical value indicating whether you can query a specified attribute or method for a specified widget.
Syntax
CAN-QUERY ( handle , attribute-name )
handle
An expression that evaluates to a handle. The handle must refer to a valid widget.
attribute-name
An expression that evaluates to a character-string value. The contents of the string must be an attribute or method name. For more information on attributes, see the Handle Attributes and Methods Reference.
Example
The following example prompts for a widget type and an attribute. It creates a widget of the specified type and passes a handle to that widget and the attribute you specified to the CAN-QUERY and CAN-SET functions. Then it reports whether the attribute can be queried or set for that widget.
r-prog.p
DEFINE VARIABLE attribute AS CHARACTER NO-UNDO FORMAT "x(24)"
LABEL "Attribute".
DEFINE VARIABLE queryable AS LOGICAL NO-UNDO VIEW-AS TOGGLE-BOX
LABEL "Query".
DEFINE VARIABLE setable AS LOGICAL NO-UNDO VIEW-AS TOGGLE-BOX
LABEL "Set".
DEFINE VARIABLE temp-handle AS HANDLE NO-UNDO.
DEFINE VARIABLE widget-type AS CHARACTER NO-UNDO FORMAT "x(24)"
LABEL "Widget".