Agilent Technologies InfiniiVision 3000 Programmer's Manual page 1170

39
Programming Examples
1170
CheckVisaStatus(nViStatus)
' Write and read buffers need to be flushed after IEEE block?
nViStatus = visa32.viFlush(m_nSession, visa32.VI_WRITE_BUF)
CheckVisaStatus(nViStatus)
nViStatus = visa32.viFlush(m_nSession, visa32.VI_READ_BUF)
CheckVisaStatus(nViStatus)
Return length
End Function
Private Sub CheckInstrumentErrors(ByVal strCommand As String)
' Check for instrument errors.
Dim strInstrumentError As New StringBuilder(1000)
Dim bFirstError As Boolean = True
Do ' While not "0,No error"
VisaSendCommandOrQuery(":SYSTem:ERRor?")
strInstrumentError = VisaGetResultString()
If Not strInstrumentError.ToString().StartsWith("+0,") Then
If bFirstError Then
Console.WriteLine("ERROR(s) for command '{0}': ", _
strCommand)
bFirstError = False
End If
Console.Write(strInstrumentError)
End If
Loop While Not strInstrumentError.ToString().StartsWith("+0,")
End Sub
Private Sub OpenResourceManager()
Dim nViStatus As Integer
nViStatus = visa32.viOpenDefaultRM(Me.m_nResourceManager)
If nViStatus < visa32.VI_SUCCESS Then
Throw New _
ApplicationException("Failed to open Resource Manager")
End If
End Sub
Private Sub OpenSession()
Dim nViStatus As Integer
nViStatus = visa32.viOpen(Me.m_nResourceManager, _
Me.m_strVisaAddress, visa32.VI_NO_LOCK, _
visa32.VI_TMO_IMMEDIATE, Me.m_nSession)
CheckVisaStatus(nViStatus)
End Sub
Public Sub SetTimeoutSeconds(ByVal nSeconds As Integer)
Dim nViStatus As Integer
nViStatus = visa32.viSetAttribute(Me.m_nSession, _
visa32.VI_ATTR_TMO_VALUE, nSeconds * 1000)
CheckVisaStatus(nViStatus)
End Sub
Public Sub CheckVisaStatus(ByVal nViStatus As Integer)
' If VISA error, throw exception.
Agilent InfiniiVision 3000 X-Series Oscilloscopes Programmer's Guide