Table Of Contents
Read Multiple Elements from Stream (G Dataflow)
Reads an array of elements from a network stream. You can call this node from the reader endpoint only.
number of elements
Number of elements you want to read from the stream. Use the Available Elements for Reading property of the Network Streams Property node to determine the number of elements in the stream.
Default Value Behavior for -1
If you use the default value for this input, the timeout in ms input is ignored, and this node immediately returns any data available for reading. However, if you use the default value for this input and there are no elements available for reading, this node returns an empty array.
Error for Numbers Greater than read buffer size
Specifying a number greater than the read buffer size of the Create Network Stream Reader Endpoint node will return an error visible in error out.
Expiration of timeout in ms
If timeout in ms expires before the elements are available, this node will also return an empty array.
Default: -1 — Reads all available elements from the stream without timing out.
endpoint in
Reference to the endpoint. Obtain this reference by wiring the reader endpoint output of the Create Network Stream Reader Endpoint node to this input.
Wiring endpoint in Causes Hidden Inputs
The data type input becomes hidden when you specify a data type for endpoint in.
data type
Data type of the elements you want to read.
Specifying the Data Type
You must specify a data type when the node is unable to determine the data type of the stream element. If the node is able to determine the data type, the data type input becomes hidden.
To specify a data type, click the Specify Data Type checkbox in the Properties section of the Item tab. The Specify Data Type checkbox will only appear after you wire in a constant or a reference that needs a data type to be specified. Once you specify the data type, the data type input becomes hidden.
Errors Caused When Wiring Data Types
Failing to wire the data type input while it is visible will result in a broken VI. Failing to wire the same data type used to create the network stream will result in a runtime error.
timeout in ms
Time, in milliseconds, that this node waits for data.
Default: -1 — This node waits indefinitely.
error in
Error conditions that occur before this node runs.
The node responds to this input according to standard error behavior.
Standard Error Behavior
Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.
Default: No error
endpoint out
Reference to the endpoint specified by endpoint in.
data out
Data this node reads from the stream.
Default Value Behavior for -1
If you use the default value for this input, the timeout in ms input is ignored, and this node immediately returns any data available for reading. However, if you use the default value for this input and there are no elements available for reading, this node returns an empty array.
Expiration of timeout in ms
If timeout in ms expires before the elements are available, this node will also return an empty array.
timed out?
error out
Error information.
The node produces this output according to standard error behavior.
Standard Error Behavior
Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.
Where This Node Can Run:
Desktop OS: Windows
FPGA: Not supported
Web Server: Not supported in VIs that run in a web application