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# lr.eval_data

String and Parameter Functions

Returns an array of bytes from a parameter.

    byte[ ] lr.eval_data ( String name );

## Arguments

Name | Comments
--- | ---
name | The name of the parameter you want to retrieve.

The lr.eval_data function returns the values from a parameter containing a byte array.

## Return Values

This function returns the value of the specified string or null on error.

## Parameterization

You cannot use standard parameterization for any arguments in this function.

## Example

In this example, lr.eval_data returns the byte array from parameter ID into the byte array output_arr.

Copy code

    // Example array of arbitrary bytes.
        byte [] b_arr = new byte[]{(byte)0x12,(byte)0x2,(byte)0x1,(byte)0x3};
    // Save the array into parameter ID
        lr.save_data(b_arr,"ID");
    // Save the contents of the array parameter to another array
        byte [] output_arr = lr.eval_data("<ID>");
        lr.output_message("This is the value of the first output byte: "
            + Byte.toString(output_arr[0]));

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