关于取存储过程返回值的有关问题

CREATE PROCEDURE [dbo].[sp_labinsertrcvmaster]
    @reqno         varchar(20),
    @rtncode      int OUTPUT
AS
BEGIN
    IF EXISTS (SELECT tmd FROM Table_1 WHERE tmd = @reqno)
    BEGIN
        SET @rtncode = 2
        RETURN 2
    END
    
    INSERT INTO Table_1(tmd)
    VALUES (@reqno)
    
    IF @@ERROR <>0
    BEGIN
        SET @rtncode = 0
        RETURN 0
    END
    
    SET @rtncode = 1
    RETURN 1
END

Int li_ret
String ls_a
ls_a = 'gr'
declare ccc procedure for sp_labinsertrcvmaster @reqno=:ls_a,@rtncode=0;
execute ccc;
if sqlca.sqlcode = -1 then
    rollback;
    messagebox('','')
else
    fetch ccc into :li_ret;//这个代码执行 提示 “Cursor is not open”(是不是取存储过程返回值不是这样写的)
    commit;
end if
close ccc;