XmTextGetSelection - A Text function that retrieves the value of the primary selection
#include <Xm/Text.h>
Widget widget;
XmTextGetSelection retrieves the value of the primary selection. It returns a NULL pointer if no text is selected in the widget. The application is responsible for freeing the storage associated with the string by calling XtFree.
For a complete definition of Text and its associated resources, see XmText(3X).
Returns a character pointer to the string that is associated with the primary selection.