XmStringWidth - A compound string function that returns the width of the longest sequence of text components in a compound string
#include <Xm/Xm.h>
Dimension XmStringWidth (fontlist, string)
XmFontList fontlist;
XmString string;
XmStringWidth returns the width, in pixels, of the longest sequence of text components in the provided compound string. Separator components are used to delimit sequences of text components.
Returns the width of the compound string.