diff --git a/ZCppMain/ZMainHead.H b/ZCppMain/ZMainHead.H
index d06df96..a7f3037 100644
--- a/ZCppMain/ZMainHead.H
+++ b/ZCppMain/ZMainHead.H
@@ -793,21 +793,44 @@ namespace ZNsMain
 
     //////////////////////////////////////////////////////////////////////*/
 
+    namespace ZNsIn
+    {
+        const int CI_Char1Byte = 1;
+        const int CI_Char2Byte = 2;
+        const int CI_Char4Byte = 4;
+    }/*
+    namespace ZNsIn*/
+
+
+    template<int TTyiByteSize> class ZtCCharIntBySize
+    {
+        public: typedef ZTypLong TypeInt;
+    };/*
+    template<int TTyiByteSize> class ZtCCharIntBySize*/
+
+    template<> class ZtCCharIntBySize<ZNsIn::CI_Char1Byte>
+      { public: typedef ZTypInt  TypeInt; };
+    template<> class ZtCCharIntBySize<ZNsIn::CI_Char2Byte>
+      { public: typedef ZTypInt  TypeInt; };
+    template<> class ZtCCharIntBySize<ZNsIn::CI_Char4Byte>
+      { public: typedef ZTypLong TypeInt; };
+
+
     template<typename TTypChar> class ZtCCharInt
     {
-        public: typedef int TypeInt;
+        public: typedef typename ZtCCharIntBySize<sizeof(TTypChar)>::TypeInte TypeInt;
     };/*
     template<typename TTypChar> class ZtCCharInt*/
 
     template<> class ZtCCharInt<char>
     {
-        public: typedef int TypeInt;
+        public: typedef typename ZtCCharIntBySize<sizeof(char)    >::TypeInt TypeInt;
     };/*
     template<> class ZtCCharInt<char>*/
 
     template<> class ZtCCharInt<wchar_t>
     {
-        public: typedef int TypeInt;
+        public: typedef typename ZtCCharIntBySize<sizeof(wchar_t) >::TypeInt TypeInt;
     };/*
     template<> class ZtCCharInt<wchar_t>*/
 
@@ -7321,6 +7344,83 @@ namespace ZNsMain
     template<> string& ZftMakeStr(string& ARR_SaveCStr, const ZCCharView& AR_View)*/
 
 
+    /*//////////////////////////////////////////////////////////////////////////////////////
+
+    ■  template<typename TTypString> class ZtCCharType
+
+        stl 의 string 나 wstring 같은 문자열 클래스를 인자로 받는 템플릿이 있다고 할 때, 해당
+        자열 클래스가 다루는 문자형이 char 인지 wchar_t 인지 알기가 약간 번거로운데, 이를 쉽
+        게 하기 위해서, 특히 ZtCStringBase 와 통일적으로 일관성있게 알 수 있도록
+
+            template<> class ZtCCharType
+
+            cf) typedef ZtCCharType::TypeChar TypeChar;
+
+        을 설계한다. 물론
+
+            string::traits_type::char_type
+            string::traits_type::int_type
+
+        을 사용하면 관련 자료형을 알 수 있기는 한데, 혹시나 나중에 string 보다 간단한 문자열
+        클래스가 있을 경우를 대비하는 의미에서라도 이렇게 한 번 해보자.
+
+        -- 2025-10-08 21:24
+
+    //////////////////////////////////////////////////////////////////////////////////////*/
+
+
+    template<typename TTypString> class ZtCCharType
+    {
+    public:
+        typedef typename TTypString::
+            traits_type::char_type /*++*/ TypeChar;
+        typedef TTypString  /*+++++++++*/ TypeCStr;
+    public:
+        typedef typename
+          ZtCCharInt<TypeChar>::TypeInt   TypeInt ;
+    public:
+        static const int CI_ByteSize = sizeof(TypeChar);
+    public:
+        typedef TypeChar char_type ; // for stl
+        typedef TypeInt  int_type  ; // for stl
+    public:
+    };/*
+    template<typename TTypString> class ZtCCharType*/
+
+    template<> class ZtCCharType<std::string>
+    {
+    public:
+        typedef std::string  /*+++++++*/  TypeCStr;
+        typedef char /*+++++++++++++++*/  TypeChar;
+    public:
+        typedef typename
+            ZtCCharInt<char>::TypeInt     TypeInt ;
+    public:
+        static const int CI_ByteSize = sizeof(TypeChar);
+    public:
+        typedef TypeChar char_type ; // for stl
+        typedef TypeInt  int_type  ; // for stl
+    public:
+    };/*
+    template<> class ZtCCharType<std::string>*/
+
+    template<> class ZtCCharType<std::wstring>
+    {
+    public:
+        typedef std::wstring /*+++++++*/  TypeCStr;
+        typedef wchar_t  /*+++++++++++*/  TypeChar;
+    public:
+        typedef typename
+            ZtCCharInt<wchar_t>::TypeInt  TypeInt ;
+    public:
+        static const int CI_ByteSize = sizeof(TypeChar);
+    public:
+        typedef TypeChar char_type ; // for stl
+        typedef TypeInt  int_type  ; // for stl
+    public:
+    };/*
+    template<> class ZtCCharType<std::wstring>*/
+
 
     namespace ZNsView
     {
diff --git a/ZCppMain/ZMainHeadEx.H b/ZCppMain/ZMainHeadEx.H
index 358c29b..ae8737c 100644
--- a/ZCppMain/ZMainHeadEx.H
+++ b/ZCppMain/ZMainHeadEx.H
@@ -7399,7 +7399,7 @@ namespace ZNsMain
 
         ZTypLength VL_ReadSize  = 0 ;
         ZTypCPChar VP_CopyStart =
-            const_cast<ZTypPChar>(ARR_SaveCStr.c_str())+VL_PrevSize ;
+            const_cast<ZTypPChar>(ARR_SaveCStr.data())+VL_PrevSize ;
 
         if((VL_ReadSize = read(AH_FileDesc, VP_CopyStart, VL_LastPos))<0)
         {
@@ -7446,7 +7446,7 @@ namespace ZNsMain
         ::SetFilePointer(VH_File, AL_Offset, NULL, FILE_BEGIN);
 
         ZTypCPChar VP_CopyStart =
-            const_cast<ZTypPChar>(ARR_SaveCStr.c_str())+VL_PrevSize ;
+            const_cast<ZTypPChar>(ARR_SaveCStr.data())+VL_PrevSize ;
 
         if(::ReadFile(VH_File, (LPVOID)VP_CopyStart, dwRead, &dwRead2, NULL)==FALSE)
         {
diff --git a/ZCppMain/ZtCStringEx.H b/ZCppMain/ZtCStringEx.H
index 5d4978a..fabcda7 100644
--- a/ZCppMain/ZtCStringEx.H
+++ b/ZCppMain/ZtCStringEx.H
@@ -131,6 +131,40 @@ namespace ZNsMain
     class ZtCStringBase; /*::::::::::::::::::::::::::::::::::::::::::::*/
 
 
+
+    template //////////////////////////////////////////////////////////////////
+        <
+            template<typename, typename, typename, typename>
+                class ZtCStringBase,
+            typename TTypCh    , typename TAlloc,
+            typename TAllocSize, typename TTypeString
+        >
+    class ZtCCharType
+        < ZtCStringBase<TTypCh, TAlloc, TAllocSize, TTypeString> >
+    /*#######################################################################*/
+    {
+    public:
+        typedef ZtCStringBase ///////////////////////////
+              <
+                  TTypCh, TAlloc, TAllocSize, TTypeString
+              >
+        /*/////////////////////////////////*/ TypeCStr  ;
+    public:
+        typedef TTypCh /*//////////////////*/ TypeChar  ;
+    public:
+        static const int CI_ByteSize = sizeof(TypeChar) ;
+    public:
+        typedef typename
+            ZtCCharInt<TypeChar>::TypeInt     TypeInt   ;
+    public:
+        typedef TypeChar char_type ; // for stl
+        typedef TypeInt  int_type  ; // for stl
+    public:
+    };/*
+    class ZtCCharType /*#####################################################*/
+
+
+
     namespace ZNsType
     {
 
@@ -258,12 +292,11 @@ namespace ZNsMain
     {
     public:
 
-        typedef typename TTypeString::template ZtCHelpBase< ///////
-                        ZtCStringBase
-                        <
-                            TTypCh, TAlloc, TAllocSize, TTypeString
-                        >
-        /*////////*/ >  TypeHelpBase; /////////////////////////////
+        typedef typename TTypeString::template ZtCHelpBase ///////////
+            <
+                ZtCStringBase<TTypCh, TAlloc, TAllocSize, TTypeString>
+            >
+        TypeHelpBase; ////////////////////////////////////////////////
 
         typedef typename TypeHelpBase::ZCStringList ZCStringList  ;
 
@@ -298,6 +331,10 @@ namespace ZNsMain
         typedef TAlloc        TypeAlloc ;
         typedef ZCStringList  TypeList  ;
     public:
+        typedef ZNsMain::ZtCCharType<ZtCStringBase> ZCCharType ;
+        typedef ZNsMain::ZtCCharType<ZtCStringBase> traits_type;
+        typedef typename ZCCharType::TypeInt        TypeCharInt;
+    public:
 
         enum EWriteFile // WriteFile() 에서 사용한다.
         {
diff --git a/ZCppMainTest/ZtCStringBase_000.cpp b/ZCppMainTest/ZtCStringBase_000.cpp
index f2d6f14..9e9ebbe 100644
--- a/ZCppMainTest/ZtCStringBase_000.cpp
+++ b/ZCppMainTest/ZtCStringBase_000.cpp
@@ -14,8 +14,19 @@ namespace ZNsMain
     namespace ZNsExam
     {
 
-        typedef ZtCStringBase<char>     CStringBase;
-        typedef CStringBase::ZCCharView ZCCharView ;
+        typedef ZtCStringBase<char>         ZCStringBase  ;
+        typedef ZtCStringBase<wchar_t>      ZCStringBaseW ;
+        typedef ZCStringBase::ZCCharView    ZCCharView    ;
+        typedef ZtCCharType<ZCStringBase>   ZCCharType    ;
+        typedef ZtCCharType<ZCStringBaseW>  ZCCharTypeW   ;
+
+        typedef ZCCharType ::TypeChar      TypeChar       ;
+        typedef ZCCharTypeW::TypeChar      TypeCharW      ;
+        typedef ZCCharType ::TypeInt       TypeCharInt    ;
+        typedef ZCCharTypeW::TypeInt       TypeCharIntW   ;
+
+        const int CI_ByteSize = ZCCharType ::CI_ByteSize  ;
+        const int CI_ByteSizeW= ZCCharTypeW::CI_ByteSize  ;
 
 
         template<typename TDummy=void*> class ZtCExamCStringBase_000
@@ -24,9 +35,29 @@ namespace ZNsMain
 
             static int Main(int AI_ArgCnt=0, char* APP_ArgVal[]=0)
             {
+                cout<<"# TypeChar    ="<<typeid(TypeChar    ).name()<<endl;
+                cout<<"# TypeCharW   ="<<typeid(TypeCharW   ).name()<<endl;
+                cout<<"# TypeCharInt ="<<typeid(TypeCharInt ).name()<<endl;
+                cout<<"# TypeCharIntW="<<typeid(TypeCharIntW).name()<<endl;
+                cout<<"# CI_ByteSize ="<<CI_ByteSize                <<endl;
+                cout<<"# CI_ByteSizeW="<<CI_ByteSizeW               <<endl;
+
+                cout<<"# ZCStringBase ::TypeCharInt="<<typeid(ZCStringBase ::TypeCharInt).name()<<endl;
+                cout<<"# ZCStringBaseW::TypeCharInt="<<typeid(ZCStringBaseW::TypeCharInt).name()<<endl;
+
+                cout<<"# ZCStringBase ::traits_type::char_type="<<typeid(ZCStringBase ::traits_type::char_type).name()<<endl;
+                cout<<"# ZCStringBaseW::traits_type::char_type="<<typeid(ZCStringBaseW::traits_type::char_type).name()<<endl;
+                cout<<"# ZCStringBase ::traits_type::int_type ="<<typeid(ZCStringBase ::traits_type::int_type ).name()<<endl;
+                cout<<"# ZCStringBaseW::traits_type::int_type ="<<typeid(ZCStringBaseW::traits_type::int_type ).name()<<endl;
+
+                cout<<"# ZCStringBase ::traits_type="<<typeid(ZCStringBase ::traits_type).name()<<endl;
+                cout<<"# ZCStringBaseW::traits_type="<<typeid(ZCStringBaseW::traits_type).name()<<endl;
+                cout<<"*****************************************************"<<endl;
+
+
                 const ZCCharView CO_ZCCharView("1234AA5678AA90abcAAss");
 
-                CStringBase VO_ZCStringStd(CO_ZCCharView);
+                ZCStringBase VO_ZCStringStd(CO_ZCCharView);
                 cout<<"# "<<VO_ZCStringStd<<endl;
 
                 cout<<"* after Replace('12', '***')"<<endl;