determine which renderer is set on a raster layer in ArcObjects

KarstenVennemann

I am trying to use ArcObjects (Visual Basic) to loop through the map layers in an ArcGIS desktop *.mxd document and read the renderers that are attached to the existing layers (want to use Raster layers). Can anyone tell me how to read (not set ) the property of a layer (or data set) which renderer is attached to it currently ? I found tons of examples how to set a renderer it but I need instead to read what is set already. The next step I need to get the b colors for the classes in the renderer. If anyone has a code example (no matter which programming language that would be terrific

Thanks Karsten

Hornbydd

The following VBA code shows you how to get a handle on a raster layers renderer:

Public Sub test()
    ' Get document
    Dim pmxd As IMxDocument
    Set pmxd = ThisDocument
    
    ' Get map
    Dim pmap As IMap
    Set pmap = pmxd.FocusMap
    
    ' Get first layer (assumed to be raster)
    Dim pLayer As ILayer
    Set pLayer = pmap.Layer(0)
    
    ' QI into rasterlayer
    Dim pRasterLayer As IRasterLayer
    Set pRasterLayer = pLayer
    
    ' Get renderer
    Dim pRasterRenderer As IRasterRenderer
    Set pRasterRenderer = pRasterLayer.Renderer
    
    ' Test renderer type and report
    If TypeOf pRasterRenderer Is IRasterStretchColorRampRenderer Then
       Debug.Print "stretchy!"
       Dim pRasterStretchColorRampRenderer As IRasterStretchColorRampRenderer
       Set pRasterStretchColorRampRenderer = pRasterRenderer
       Debug.Print pRasterStretchColorRampRenderer.LabelHigh
    End If
End Sub