CString成员函数详解.doc

CString类所有成员函数详解VC里CString是我们最常用的类之一，我们觉得对它很熟悉了，可是你知道它的所有用法吗？还是系统的学习一下吧，认真看完本文就OK了。下面开始：CString::Compareint Compare( LPCTSTR lpsz ) const;返回值 字符串一样 返回0 ???????? 小于lpsz 返回-1???????? 大于lpsz 返回1???????? 区分大小字符???????? CString s1( abc );CString s2( abd );ASSERT( s1.Compare( s2 ) == -1 );ASSERT( s1.Compare( abe ) == -1 );CString::CompareNoCaseint CompareNoCase( LPCTSTR lpsz ) const;返回值 字符串一样 返回0 ??????? 小于lpsz 返回-1??????? 大于lpsz 返回1??????? 不区分大小字符CString::Collateint Collate( LPCTSTR lpsz ) const;同CString::CompareCString::CollateNoCaseint CollateNocase( LPCTSTR lpsz ) const;同CString::CompareNoCaseCString::CStringCString( );CString( const CString stringSrc ); CString( TCHAR ch, int nRepeat = 1 ); CString( LPCTSTR lpch, int nLength ); CString( const unsigned char* psz ); CString( LPCWSTR lpsz );CString( LPCSTR lpsz ); 例子最容易说明问题CString s1;????????????????????? CString s2( cat );?????????????? CString s3 = s2;????????????????? CString s4( s2 + + s3 );???????? CString s5( x );????????????????????? // s5 = xCString s6( x, 6 );?????????????????? // s6 = xxxxxxCString s7((LPCSTR)ID_FILE_NEW);??????? // s7 = Create a new documentCString city = Philadelphia; CString::Deleteint Delete( int nIndex, int nCount = 1); 返回值是被删除前的字符串的长度nIndex是第一个被删除的字符，nCount是一次删除几个字符。根据我实验得出的结果：当nCount要删除字符串的最大长度(GetCount() - nIndex)时会出错，当nCount过大，没有足够的字符删除时，此函数不执行。例子CString str1,str2,str3;char a;str1 = nihao;str2 = nIhao;int x;// int i=(str1 == str2);?????? str1.Delete(2,3);如果nCount(3) GetCount() – nIndex (5-2)就会执行错误CString::EmptyVoid Empty( );没有返回值 清空操作;例子CString s( abc );s.Empty();ASSERT( s.GetLength( ) == 0 );CString::Findint Find( TCHAR ch ) const;int Find( LPCTSTR lpszSub ) const;int Find( TCHAR ch, int nStart ) const;int Find( LPCTSTR lpszSub, int nStart ) const;返回值 不匹配的话返回 -1; 索引以0 开始??????? nStar 代表以索引值nStart 的字符开始搜索 ,即为包含以索引nStart字符后的字符串例子CString s( abcdef );ASSERT( s.Find( c ) == 2 );ASSERT( s.Find( de ) == 3 );Cstring str(“The