I would like to add a white halo to labels using ArcObjects. I think I need to reference the IFormattedTextSymbol interface, but I'm not sure how to implement this into my current code (see below).
Dim pDoc As IMxDocument
Set pDoc = ThisDocument
Set pMap = pDoc.FocusMap
' Get the selected layer
Dim pLayer As IGeoFeatureLayer
Set pLayer = pMap.Layer(0)
Dim pFc As IFeatureClass
Dim strOIDName As String
Set pFc = pLayer.FeatureClass
strOIDName = pFc.OIDFieldName
' Get the selected features from the layer
Dim pFSel As IFeatureSelection
Set pFSel = pLayer
Dim pSelSet As ISelectionSet
Set pSelSet = pFSel.SelectionSet
Dim pFCur As IFeatureCursor
pSelSet.Search Nothing, False, pFCur
' Loop through the selected features and create a label
' expression for the selected features
Dim pFeat As IFeature
Dim strSql As String
Set pFeat = pFCur.NextFeature
Do While Not pFeat Is Nothing
If strSql = "" Then
strSql = strOIDName & " = " & pFeat.OID
Else
strSql = strSql & " or " & strOIDName & " = " & pFeat.OID
End If
Set pFeat = pFCur.NextFeature
Loop
Debug.Print strSql
' Get AnnotateLayerPropertiesCollection from layer
Dim pAnnoLayerPropsColl As IAnnotateLayerPropertiesCollection
Set pAnnoLayerPropsColl = pLayer.AnnotationProperties
Dim pAnnoLayerProps As IAnnotateLayerProperties
pAnnoLayerPropsColl.QueryItem 0, pAnnoLayerProps, Nothing, Nothing
pAnnoLayerProps.Class = "LabelSel"
pAnnoLayerProps.WhereClause = strSql
Dim aAnnoVBScriptEngine As IAnnotationExpressionEngine
Set aAnnoVBScriptEngine = New AnnotationVBScriptEngine
Dim pTextsymbol As ITextSymbol
Set pTextsymbol = New TextSymbol
Dim pFont As IFontDisp
Set pFont = pTextsymbol.font
Dim pFormattedtxtsym As IFormattedTextSymbol
pFormattedtxtsym.ShadowColor = True
pFont.Bold = True
pFont.size = 10
pFont.Weight = 2
pTextsymbol.font = pFont
Dim pLELayerProps As ILabelEngineLayerProperties
Set pLELayerProps = pAnnoLayerProps
Set pLELayerProps.ExpressionParser = aAnnoVBScriptEngine
pLELayerProps.Expression = "[Longlabel] & vbnewline & [Latlabel] & vbnewline & [Elevlabel] & _ vbnewline &[Driftlabel]"
Set pLELayerProps.Symbol = pTextsymbol
' Display the lables
pLayer.DisplayAnnotation = True
' Refresh the Data Frame
pDoc.ActiveView.Refresh
Best Answer
Halos are specified through the IMask interface which the TextSymbol class implements: