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ALPHA-VISION® Functions of Data Object Server: Obj_QueryAttr
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Obj_QueryAttr
SUMMARY
Obj_QueryAttr - Query attribute of data object
SYNTAX
Obj_QueryAttr(pointid,attribute)
ARGUMENTS
- Pointid
-
Name of the Data Object
- attribute
-
Attribute to be queried
RETURN VALUE
depending on the queried attribute
DESCRIPTION
Queries the attribute of a defined data object.
4 types of data objects are availble.
The attributes of these data objects are descriped in:
Attributes of
data objects
Note:
The data object type ‘Reference Object’ does not have attributes
on its own, but always refer to other types.
EXAMPLES
Obj_QueryAttr(SINUS,Status)
The data object ‘SINUS’ is queried for the status.
Syntax Notation
- [aaa]
- aaa is optional (zero or one occurences)
- (aaa|bbb)
- aaa exclusive or bbb
- (aaa)*
- aaa may occur indefinitely often or may be omitted
- (aaa)+
- aaa may occur indefinitely often but at least once
- (aaa)m..n
- aaa may occur from m to n times