XmClipboardInquireLength — A clipboard function that returns the length of the stored data

XmClipboardInquireLength returns the length of the data stored under a  specified  format  name  for  the
       clipboard  data  item.  If  no  data  is  found  for  the specified format, or if there is no item on the
       clipboard, this function returns a value of 0 (zero) in the length argument.

       Any format passed by name is assumed to have length passed in a call to XmClipboardCopy, even though  the
       data has not yet been transferred to the clipboard in that format.

       display   Specifies  a  pointer  to  the  Display  structure  that  was  returned  in  a previous call to
                 XOpenDisplay or XtDisplay.

       window    Specifies the window ID of a widget that relates the application window to the  clipboard.  The
                 widget's window ID can be obtained through XtWindow.  The same application instance should pass
                 the same window ID to each of the clipboard functions that it calls.

       format_name
                 Specifies the name of the format for the data item.

       length    Specifies  the  length  of  the  next data item in the specified format. This argument equals 0
                 (zero) if no data is found for the specified format, or if there is no item on the clipboard.

XmClipboardInquireLength   —   A   clipboard  function  that  returns  the  length  of  the  stored  data
       "XmClipboardInquireLength" "clipboard functions" "XmClipboardInquireLength"

XmClipboardCopy(3) and XmClipboardStartCopy(3).

                                                                                     XmClipboardInquireLength(3)

XmClipboardSuccess
                 The function was successful.

       XmClipboardLocked
                 The function failed because the clipboard was locked by another  application.  The  application
                 can continue to call the function again with the same parameters until the lock goes away. This
                 gives  the application the opportunity to ask if the user wants to keep trying or to give up on
                 the operation.

       XmClipboardNoData
                 The function could not find data on the clipboard corresponding to the format  requested.  This
                 could  occur  because  the  clipboard  is empty; there is data on the clipboard, but not in the
                 requested format; or the data in the requested format was passed  by  name  and  is  no  longer
                 available.

       #include <Xm/CutPaste.h>
       int XmClipboardInquireLength (display,window,format_name,length)
               Display *display;
               Window  window;
               char    *format_name;
               unsigned long   *length;
       (void)