




The function port-string-width returns the 
width
 in pixels of 
string
 when drawn to 
port
. The font used is the 
font
 currently in the port's graphics-state.
To compute the horizontal extents of each successive character in a string for a given port or font, use compute-char-extents.
CAPI User Guide and Reference Manual (Windows version) - 3 Aug 2017