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Fix SOLIDWORKS macro issues with lightweight components in assembly or drawing

Symptoms

SOLIDWORKS macro is working with the components in the assembly (e.g. reading/writing properties, materials, working with features etc.). Error Run-time Error '91': Object variable or With block variable not set is displayed when macro is run.

Cause

Components can be loaded lightweight which means that their underlying model is not loaded into the memory. In this case all APIs of the component's model are not available

Lightweight component in the Feature Manager Tree

Resolutions

Dim swApp As SldWorks.SldWorks
Dim swAssy As SldWorks.AssemblyDoc

Sub main()

Set swApp = Application.SldWorks

Set swAssy = swApp.ActiveDoc

swAssy.ResolveAllLightWeightComponents True

Dim swComp As SldWorks.Component2
Set swComp = swAssy.SelectionManager.GetSelectedObject6(1, -1)

Dim swRefModel As SldWorks.ModelDoc2
Set swRefModel = swComp.GetModelDoc2

If Not swRefModel Is Nothing Then 'Check if the pointer is not nothing
MsgBox "Material of " & swComp.Name2 & ": " & swRefModel.MaterialIdName
Else
MsgBox "Component's model is not loaded into the memory" 'display the error
End If

End Sub