Per-client codepage detection and handling

example4/help.go

@@ -48,7 +48,7 @@ var helpScreen = go3270.Screen{
 // generator function for it is a stand-alone function and not a method on the
 // session.
 func help(returnTransaction go3270.Tx) go3270.Tx {
-	return func(conn net.Conn, _ go3270.DevInfo, data any) (
+	return func(conn net.Conn, devinfo go3270.DevInfo, data any) (
 		go3270.Tx, any, error) {
 		_, err := go3270.HandleScreen(
 			helpScreen,                  // the screen to display
@@ -58,7 +58,8 @@ func help(returnTransaction go3270.Tx) go3270.Tx {
 			nil,
 			"errormsg", // name of field to put error messages in
 			23, 79,     // cursor coordinates
-			conn)
+			conn,
+			devinfo.Codepage())
 		if err != nil {
 			return nil, nil, err
 		}