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How to Delete an Assignment from an SMS 2003 Advertisement

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I recently worked on an issue where a customer was trying to programmatically delete a mandatory assignment from an SMS 2003 advertisement. I saw that adding an assignment is a very easy and documented task, however deleting the same assignment is not.

Unfortunately I was only able to work on the issue for a few hours because I was going on vacation but one of my peers, David Stewart, figured it out while I was out. I thought this example would be useful for anyone looking to delete an assignment using a script.

 ' Parse cmd line args
' ==============================
sSiteCode = WScript.Arguments(0)
sAdvertID = WScript.Arguments(1)

' Connect to local site provider
' ==============================
Set objSWbemLocator = CreateObject("WbemScripting.SWbemLocator")
Set objSWbemServices = objSWbemLocator.ConnectServer(".", "root\sms")
Set ProviderLoc = objSWbemServices.InstancesOf("SMS_ProviderLocation")
For Each Location In ProviderLoc
    If Location.ProviderForLocalSite = True Then
        Set objSWbemServices = objSWbemLocator.ConnectServer(Location.Machine, "root\sms\site_" + Location.SiteCode)
        Set objSWbemLocator = Nothing
        Set ProviderLoc = Nothing
    End If
Next

' Retrieve the advertisment instance of concern
' =============================================
Set objAdvert = objSWbemServices.Get("SMS_Advertisement.AdvertisementID='" & sAdvertID & "'")

' Display advertisement properties
' ================================
WScript.Echo "ActionInProgress = " & objAdvert.ActionInProgress
WScript.Echo "AdvertFlags = " & objAdvert.AdvertFlags
WScript.Echo "AdvertisementID = " & objAdvert.AdvertisementID
WScript.Echo "AdvertisementName = " & objAdvert.AdvertisementName
WScript.Echo "CollectionID = " & objAdvert.CollectionID
WScript.Echo "Comment = " & objAdvert.Comment
WScript.Echo "Assigned Schedule = {"

' Display advertisement properties
' ================================
set Advertisement_Properties = objAdvert.Properties_ 'get property set
set AssignedScheduleArray = Advertisement_Properties.Item("AssignedSchedule")

' Display advertisement properties
' ================================
Dim replacementScheduleArray()

intSize = 0

' Loop through current assignments, copy them to new array to update advertisement instance.
' Leave any assignments we want to remove out of the new array.
' ==========================================================================================
for i = 0 to UBound(AssignedScheduleArray)

    'Retrieve next schedule token from instance array
    '================================================
    Dim SMS_ScheduleToken
    Set SMS_ScheduleToken = AssignedScheduleArray(i)
    
    'Display schedule token, ask if it should be deleted.
    '====================================================
    WScript.Echo AssignedScheduleArray.Name & " " & i & ":" & SMS_ScheduleToken.GetObjectText_()
    If MsgBox("Do you want to delete this assignment?", 4, "Assignment:" & SMS_ScheduleToken.StartTime) <> vbYes Then
        
        'Not deleting this schedule token, add it to the replacement array.
        '==================================================================
        redim preserve replacementScheduleArray(intSize)
        set replacementScheduleArray(intSize) = SMS_ScheduleToken.Clone_()
        intSize = intSize + 1
    end if
next
WScript.Echo "}"

'Update the advertisement instance with the replacement schedule token array
'===========================================================================
if(IntSize < 1) then
    'We removed all the schedule tokens.
    objAdvert.Properties_.Item("AssignedSchedule") = null   
else
    ' There is at least one value to keep
    objAdvert.Properties_.Item("AssignedSchedule") = replacementScheduleArray
end if
objAdvert.Put_()

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