慕容3067478
CString 有下面几个函数Mid Extracts the middle part of a string (like the Basic MID$ function).Left Extracts the left part of a string (like the Basic LEFT$ function).Right Extracts the right part of a string (like the Basic RIGHT$ function).SpanIncluding Extracts a substring that contains only the characters in a set.SpanExcluding Extracts a substring that contains only the characters not in a set.点 MidCString::MidCString Mid( int nFirst ) const;throw( CMemoryException );CString Mid( int nFirst, int nCount ) const;throw( CMemoryException );Return ValueA CString object that contains a copy of the specified range of characters. Note that the returned CString object may be empty.ParametersnFirstThe zero-based index of the first character in this CString object that is to be included in the extracted substring.nCountThe number of characters to extract from this CString object. If this parameter is not supplied, then the remainder of the string is extracted.RemarksExtracts a substring of length nCount characters from this CString object, starting at position nFirst (zero-based). The function returns a copy of the extracted substring. Mid is similar to the Basic MID$ function (except that indexes are zero-based).For multibyte character sets (MBCS), nCount refers to each 8-bit character; that is, a lead and trail byte in one multibyte character are counted as two characters.ExampleThe following example demonstrates the use of CString::Mid.// example for CString::MidCString s( _T("abcdef") );ASSERT( s.Mid( 2, 3 ) == _T("cde") );第2到第4(序号是从0开始的 indexes are zero-based，第2个就是1，2到4总共3个字符)s,Mid(1,3)