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How to Capture a Trace with WMI

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Trace capturing refers to the process of viewing trace logs. For Host Integration Server, this typically refers to collating data stored in trace log objects into a single file and saving it to a specified location. You can capture SNA trace information in the same manner as you would retrieve any other information from Windows Management Instrumentation (WMI). You use ExecQuery to make a call to the relevant object, and then write the information to the location you want.

To capture a trace

  1. Connect to the namespace using GetObject with a moniker in the parameter.

  2. Retrieve the objects representing the SNA Application using ExecQuery.

    The core functionality of capturing a trace can be described in the following code:

    Set colItems = objWMIService.ExecQuery("Select * from MsHisTrace_SNAApplication",,48)  
Set colItems = objWMIService.ExecQuery("Select * from MsHisTrace_SNABase",,48)

    Everything else in this sample is to support logging to a file.

    The following code example shows how to capture a trace:

On Error Resume Next  
strComputer = "."  
Dim iCounter  
'Initialize  
    CreateLogFile  
    Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\MicrosoftHIS")  
  
'Validate TraceSnaApplication  
    iCounter = 0  
    Set colItems = objWMIService.ExecQuery("Select * from MsHisTrace_SNAApplication",,48)  
For Each objItem in colItems  
    Wscript.Echo "APPCTrace: " & objItem.APPCTrace  
    Wscript.Echo "CPICTrace: " & objItem.CPICTrace  
    Wscript.Echo "CSVTrace: " & objItem.CSVTrace  
    Wscript.Echo "EnabledTraces: " & objItem.EnabledTraces  
    Wscript.Echo "InternalMessageTrace: " & objItem.InternalMessageTrace  
    Wscript.Echo "LU62Trace: " & objItem.LU62Trace  
    Wscript.Echo "LUATrace: " & objItem.LUATrace  
    Wscript.Echo "T3270Trace: " & objItem.T3270Trace  
    iCounter = iCounter + 1  
Next  
  
if iCounter > 0 then  
    Wscript.Echo "Number of Instances found " & iCounter  
else  
    Wscript.Echo "No Instances Found"  
End If  
  
    iCounter = 0  
    Set colItems = objWMIService.ExecQuery("Select * from MsHisTrace_SNABase",,48)  
For Each objItem in colItems  
    Wscript.Echo "EnabledTraces: " & objItem.EnabledTraces  
    Wscript.Echo "InternalMessageTrace: " & objItem.InternalMessageTrace  
    Wscript.Echo "LU62Trace: " & objItem.LU62Trace  
    Wscript.Echo "T3270Trace: " & objItem.T3270Trace  
    iCounter = iCounter + 1  
Next  
  
if iCounter > 0 then  
    Wscript.Echo "Number of Instances found " & iCounter  
else  
    Wscript.Echo "No Instances Found"  
End If