CogNdm.ReadUserData Method

CogNdm ReadUserData Method

Cognex VisionPro 9.10

Reads user data sent from the remote device (PLC) to the vision system.

Values returned from this function will not reflect changes to the user data present on the remote system until the remote system signals the vision system that new user data is available by sendng a "Set User Data" signal.

Namespace: Cognex.VisionPro.Comm
Assembly: Cognex.VisionPro.Comm (in Cognex.VisionPro.Comm.dll) Version: 79.0.0.0

Syntax

C++

Copy to Clipboard Print

public byte[] ReadUserData(
	int offset,
	int size
)

public byte[] ReadUserData(
	int offset,
	int size
)

Public Function ReadUserData ( 
	offset As Integer,
	size As Integer
) As Byte()

Public Function ReadUserData ( 
	offset As Integer,
	size As Integer
) As Byte()

public:
array<unsigned char>^ ReadUserData(
	int offset, 
	int size
)

public:
array<unsigned char>^ ReadUserData(
	int offset, 
	int size
)

Parameters

offset: Type: System Int32
The offset into the user data at which to read.

size: Type: System Int32
The number of bytes of user data to read.

Return Value

Type: Byte

Exceptions

Exception	Condition
ArgumentOutOfRangeException	Thrown if the offset is less than 0 or greater than 65535 [0xFFFF].
ArgumentOutOfRangeException	Thrown if the size is less than 0 or greater than 65535 [0xFFFF].
CogFfpInvalidOperationException	Thrown if offset + size is greater than max data size.