Screen 0,3
Window 0,0,0,320,256,0,"Example",-1,-1

rp.l=RastPort(0)                     ;the rastport of the used window
a$="Blitz Forever"                   ;the string to examine
pixlen.w=TextLength_(rp,&a$,Len(a$)) ;Easy!!!!!!!!!!!!!!!!! :)

NPrint a$
NPrint "Is ",pixlen," pixels long."

MouseWait