XmDataFieldGetSelection man page
XmDataFieldGetSelection — A DataField function that retrieves the value of the primary selection
#include <Xm/DataF.h> char * XmDataFieldGetSelection( Widget widget);
XmDataFieldGetSelection 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.
Specifies the DataField widget ID
For a complete definition of DataField and its associated resources, see XmDataField(3).
Returns a character pointer to the string that is associated with the primary selection.
XmDataField(3) and XmDataFieldGetSelectionWcs(3).