diff --git a/inc/hgl/io/TextOutputStream.h b/inc/hgl/io/TextOutputStream.h
index 20f838b..68e0522 100644
--- a/inc/hgl/io/TextOutputStream.h
+++ b/inc/hgl/io/TextOutputStream.h
@@ -123,7 +123,7 @@ namespace hgl
 
                 for(int i=0;i<count;i++)
                 {
-                    const BaseString<T> &str=sl[i];
+                    const T &str=sl.GetString(i);
 
                     const int len=str.Length();
 
diff --git a/inc/hgl/type/List.cpp b/inc/hgl/type/List.cpp
index 72c9ae2..ed39490 100644
--- a/inc/hgl/type/List.cpp
+++ b/inc/hgl/type/List.cpp
@@ -19,7 +19,7 @@ namespace hgl
     template<typename T>
     bool List<T>::Begin(T &ti)const
     {
-        if(!items)
+        if(!items||count<=0)
             return(false);
 
         memcpy(&ti,items,sizeof(T));
@@ -29,7 +29,7 @@ namespace hgl
     template<typename T>
     bool List<T>::End(T &ti)const
     {
-        if(!items)
+        if(!items||count<=0)
             return(false);
 
         memcpy(&ti,items+count-1,sizeof(T));
diff --git a/inc/hgl/type/StringList.h b/inc/hgl/type/StringList.h
index 70cffa0..1e94875 100644
--- a/inc/hgl/type/StringList.h
+++ b/inc/hgl/type/StringList.h
@@ -205,7 +205,7 @@ namespace hgl
             Items.Exchange(index1,index2);
         }
 
-        T &GetString(int n)const{return *(Items[n]);}                                               ///<取得指定行字符串
+        const T &GetString(int n)const{return *(Items[n]);}                                         ///<取得指定行字符串
     };//template<typename T> class StringList
 
     template<typename T> T StringList<T>::NullString;                                               ///<空字符串实例