National Instruments 374318A-01 Manuel D’Utilisation
Chapter 4
Getting Started with Measurement Studio
© National Instruments Corporation
4-23
Generating and displaying the data
1.
Double-click the button control to display the
Form1
code, with the
cursor inside the click event handler of the button control.
2.
Add the following code to read a raw data point from a specified
channel on the Measurement Computing device, convert the data to
volts, and display the value on the graph.
channel on the Measurement Computing device, convert the data to
volts, and display the value on the graph.
[VB.NET]
Dim I As Integer
Dim WrtString As String = "val?"
Dim RdBufSize As Integer = 100
Dim NlChar As Char = "\n"
Dim NullChar As Char = "\0"
Dim PrimaryAddress As New Address(2)
Dim BoardNum As Integer = 0
' Open a gpib device
Dim Device As New Device(BoardNum, PrimaryAddress)
' Allocate a buffer to hold the data
Dim Buffer As IntPtr =
System.Runtime.InteropServices.Marshal.AllocHGlobal(RdBufSize)
' Read and plot 100 samples
For I = 0 To 99
' Write the string (val?) to the Fluke45
Device.Write(WrtString)
' Read the response from the Fluke45
Dim S As String = Device.ReadString(RdBufSize)
' Replace the newline character with a null and