How can I show a Runtime error?

I am delphi programmer as well. In delphi all exceptions derive from Exception so typicall you might write

try
..
..
except
 on e:exception do ...
end;
[code]

MAX isnt much differnt and you can catch different types of exceptions.  All exceptions in MAX are objects.

You asked how to catch a runtime error :)

To catch all exceptions
[code]
' Here is one i made up
Type EMyException
	Method ToString:String()
		Return "EMyException- Poopie"	
	End Method
End Type
Type  TApplication
	Method Run()
        Graphics 640,480,0
		While Not KeyHit(KEY_ESCAPE)
			Cls
			If KeyHit (KEY_F1)
				RuntimeError "Poop" ' this throws TBlitzException
			End If				
			If KeyHit (KEY_F2)
				Throw "Poopie"	' This throws a string object						
			End If	
			If KeyHit (KEY_F3)
				Throw (New EMyException)	' This throws EMyException						
			End If	
			
			Flip
		Wend
	End Method
End Type


' Main code notice the try catch that whats important

Try
   (New TApplication).Run
Catch  r:TRuntimeException
	Notify "Runtime "+r.ToString()
Catch  e:String
    Notify "Unhandled"+e.ToString()
Catch  d:EMyException
    Notify "Unhandled"+d.ToString()
End Try

You notice it is very similar. Now you can just catch o:Object and attempt to figure out what it is if you need general handler

Hope this helps.

Doug Stastny