Agilent Technologies InfiniiVision 2000 X-Series, Programmer'S Manual, Page: 851 / 930

Programming Examples
38
Agilent InfiniiVision 2000 X-Series Oscilloscopes Programmer's Guide 851
err = viFlush(vi, VI_WRITE_BUF)
If (err <> VI_SUCCESS) Then HandleVISAError vi
' retCount is now actual number of bytes returned by query.
DoQueryIEEEBlock_Bytes = retCount
CheckInstrumentErrors
End Function
Private Sub CheckInstrumentErrors()
On Error GoTo ErrorHandler
Dim strErrVal As String * 200
Dim strOut As String
err = viVPrintf(vi, ":SYSTem:ERRor?" + vbLf, 0) ' Query any errors.
If (err <> VI_SUCCESS) Then HandleVISAError vi
err = viVScanf(vi, "%t", strErrVal) ' Read: Errnum,"Error String".
If (err <> VI_SUCCESS) Then HandleVISAError vi
While Val(strErrVal) <> 0 ' End if find: 0,"No Error".
strOut = "INST Error: " + strErrVal
err = viVPrintf(vi, ":SYSTem:ERRor?" + vbLf, 0) ' Request error.
If (err <> VI_SUCCESS) Then HandleVISAError vi
err = viVScanf(vi, "%t", strErrVal) ' Read error message.
If (err <> VI_SUCCESS) Then HandleVISAError vi
Wend
If Not strOut = "" Then
MsgBox strOut, vbExclamation, "INST Error Messages"
err = viFlush(vi, VI_READ_BUF)
If (err <> VI_SUCCESS) Then HandleVISAError vi
err = viFlush(vi, VI_WRITE_BUF)
If (err <> VI_SUCCESS) Then HandleVISAError vi
End If
Exit Sub
ErrorHandler:
MsgBox "*** Error : " + Error, vbExclamation
End
End Sub
Private Sub HandleVISAError(session As Long)
Dim strVisaErr As String * 200