CheckInverseData (FUN)

FUNCTION CheckInverseData : BOOL

Checks if one buffer contains the inverse

of another.

This function compares the data at “pbyData1” of “udiLength” bytes with the data at “pbyData2”.

If the data is the exact inverse, the function returns TRUE. Otherwise the function returns FALSE.

If dwSize is 0, the function returns FALSE, as zero compared bytes can’t be inverse.

Note, that this function (similar to memcmp in C) makes no additional checks of input parameters. The caller has to take care about the validity of pointers and sizes, passed to this function.

As the function implements no error handling, the exact count of “udiLength” bytes is compared.

InOut:

Scope	Name	Type	Comment
Return	CheckInverseData	BOOL
Input	pbyData1	POINTER TO BYTE	Pointer to data1
	pbyData2	POINTER TO BYTE	Pointer to data2
	udiLength	UDINT	number of bytes to compare