XMLGetElementAsync (FB)¶

FUNCTION_BLOCK XMLGetElementAsync EXTENDS CBM.ETrig

Reads a xml element from file asynchronously, i.e. distributed on several cycles. This function block should be used to get elements of large xml files. To read from file set sFileName to file path and paDataArray = 0. To read from data array set sFileName = ‘’ and paDataArray to data pointer.

InOut:

Scope	Name	Type	Initial	Comment	Inherited from
Input	xExecute	BOOL		Rising edge: Action starts Falling edge: Resets outputs If a falling edge occurs before the function block has completed its action, the outputs operate in the usual manner and are only reset if either the action is completed or in the event of an error. In this case, the corresponding output values (xDone, xError) are present at the outputs for exactly one cycle.	ETrig
Output	xDone	BOOL		TRUE: Action successfully completed	ETrig
	xBusy	BOOL		TRUE: Function block active	ETrig
	xError	BOOL		TRUE: Error occurred, function block aborts action FALSE: No error	ETrig
Input	sFileName	STRING(255)		Path to a file
	udiStartPosition	UDINT		Start position in file to read elements. Use XMLElement.udiPosition´
	readMode	READ_MODE		Read mode
	paElements	POINTER TO XMLElement		Pointer to the result set
	udiMaxElements	UDINT		Maximum size of paElements
	xTruncateValues	BOOL	FALSE	true: All values that exceed the maximum value size will be truncated
	paDataArray	POINTER TO BYTE	0	Pointer to XML data array, if 0 read from file (sFileName)
	udiDataArraySize	UDINT	0	Size of paDataArray
Output	eError	ERROR		Error code if xError is true
	eLastError	ERROR		The last error
	udiCountElements	UDINT		Number of elemnents in paElements#
	udiNextReadPos	UDINT		Position in file (in bytes) of the next xml element, 0 if last element
	eEncoding	Encoding		Encoding of the xml file