将容器中（数组、集合）的数据串成字符串

开发工具VC7(VS2002) 

 核心代码用到MFC，测试代码用到stl 
本代码功能，将容器中（数组、集合）的数据串成字符串
核心代码和扩展代码往往不是一个人完成的。 扩展代码和使用也很可能不是一个人写的。
 

 //核心代码

 template<class TYPE>

 class IGetEleStr

 {

 public:

     virtual  CString GetStr(const TYPE& ele) const =0 ;

 };



 class IGetSpe

 {

 public:

     virtual CString GetSpe(int index) const = 0;

 };



 template<class EleTypePtr,class EleType>//如果是stl的迭代器，EleTypePtr不等于EleType*

 CString STLToStr(EleTypePtr begin,EleTypePtr end, const IGetEleStr<EleType>& ele, const IGetSpe& spe )

 {

     CString str ;

     int index = 0 ;//并不是所有的迭代器都支持相减

     for( EleTypePtr it = begin ; it != end ; ++ it )

     {

         if( 0 != index )

             str += spe.GetSpe(index);

         index++;

         str += ele.GetStr(*it);

     }

     return str;

 }


 //扩展代码

 class CGetConstSpe : public IGetSpe

 {

 public:

     CGetConstSpe(const CString strSpe)

     {

         m_strSpe = strSpe;

     }

     virtual CString GetSpe(int index) const

     {

         return m_strSpe;

     }

 protected:

     CString m_strSpe;

 };


 template<class EleType>

 class  CGetFormatStr : public IGetEleStr<EleType>

 {

 public:

     CGetFormatStr(const CString& strFormat)

     {

         m_strFormat = strFormat;

     }

     virtual  CString GetStr(const EleType& ele) const

     {

         CString str;

         str.Format(m_strFormat,ele);

         return str;

     }

 protected:

     CString m_strFormat;

 };


 //测试代码

 #include "afxtempl.h"

 #include <set>


 void Ctest1Dlg::OnBnClickedButton11()

 {

     int a[] = {3,4,5,6,7,8};

     CString str = STLToStr(a,a+sizeof(a)/sizeof(a[0]),CGetFormatStr<int>(_T("%d")),CGetConstSpe(_T(" ")));

     AfxMessageBox(str);


 //    CArray<float,float> f ;

     f.Add(3.3);

     f.Add(1.02);

     f.Add(0);

     f.Add(-1.33333334);

     str = STLToStr(f.GetData(),f.GetData()+f.GetSize(),CGetFormatStr<float>(_T("%3.1f")),CGetConstSpe(_T(",")));

 //    AfxMessageBox(str);


     std::set<CString> sets;

     sets.insert(CString(_T("a")));

     sets.insert(CString(_T("c")));

     str = STLToStr(sets.begin(),sets.end(),CGetFormatStr<CString>(_T("'%s'")),CGetConstSpe(_T(",")));

     AfxMessageBox(str);

 }

 //结果分别为：

 //3 4 5 6 7 8

 //3.3,1.0,0.0,-1.3

 //'a','c'


 class CGet2ConstSpe : public IGetSpe//索引+1为index的倍数，则用strSpe分隔，否则用strNormalSpe

 {

 public:

     CGet2ConstSpe(const CString strNormalSpe,const CString strSpe,int index)

     {

         m_strNormalSpe = strNormalSpe;

         m_strSpe = strSpe;

         m_index = index ;

     }

     virtual CString GetSpe(int index) const

     {

         if( ( m_index > 0 ) && ( index % m_index == 0 ) )

             return m_strSpe;

         return m_strNormalSpe;

     }

 protected:

     CString m_strSpe;

     CString m_strNormalSpe;

     int m_index;

 };


 void Ctest1Dlg::OnBnClickedButton12()

 {

     int a[] = {3,4,5,6,7,8};

     CString str = STLToStr(a,a+sizeof(a)/sizeof(a[0]),CGetFormatStr<int>(_T("%d")),CGet2ConstSpe(_T(" "),_T("\r\n"),5));

     AfxMessageBox(str);

 }

 /*  运行结果

 3 4 5 6 7

 8

 */




 class  CGetBOOLStr : public IGetEleStr<BOOL>

 {

 public:

     CGetBOOLStr(const CString& strTrue=_T("真"),const CString& strFalse=_T("假"))

     {

         m_strTure = strTrue;

         m_strFalse = strFalse;

     }

     virtual  CString GetStr(const BOOL& ele) const

     {

         return (ele) ? m_strTure : m_strFalse ;

     }

 protected:

     CString m_strTure;

     CString m_strFalse;

 };


 void Ctest1Dlg::OnBnClickedButton13()

 {

     BOOL a[] = {TRUE,TRUE,FALSE,FALSE,TRUE,TRUE,TRUE};

     CString str = STLToStr(a,a+sizeof(a)/sizeof(a[0]),CGetBOOLStr(),CGet2ConstSpe(_T(" "),_T("\r\n"),5));

     //AfxMessageBox(str);


     str = STLToStr(a,a+sizeof(a)/sizeof(a[0]),CGetBOOLStr(_T("√"),_T("×")),CGet2ConstSpe(_T(" "),_T("\r\n"),5));

     AfxMessageBox(str);

 }

 //结果分别为

 /*

 真 真 假 假 真

 真 真

 */

 /*

 √ √ × × √

 √ √

 */