从MFC类继承的基本方式

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Version VS2008

继承CString类的基本方式

#pragma onceclass CPathString :public CString{public:CPathString(void);virtual ~CPathString(void);CString GetFileExtend(void);CString GetFileName(void);CString GetFileBase(void);CString GetFilePath(void);using CString::operator =;};

这是实现文件

#include "StdAfx.h"#include "PathString.h"CPathString::CPathString(void){}CPathString::~CPathString(void){}CString CPathString::GetFileExtend(void){CString s;int nSlash = ReverseFind('\\');int nDot = ReverseFind('.');if (nDot != -1 && nDot > nSlash)s = Mid(nDot + 1);return s;}CString CPathString::GetFileName( void ){CString s;int nSlash = ReverseFind('\\');if (nSlash != -1)s = Mid(nSlash + 1);elses = GetString();return s;}CString CPathString::GetFileBase( void ){CString s = GetFileName();int nDot = s.ReverseFind('.');if (nDot != -1)s = s.Left(nDot);return s;}CString CPathString::GetFilePath( void ){CString s;int nSlash = ReverseFind('\\');if (nSlash != -1)s = Left(nSlash);return s;}

void CInherentView::OnDraw(CDC* pDC){CInherentDoc* pDoc = GetDocument();ASSERT_VALID(pDoc);if (!pDoc)return;// TODO: add draw code for native data hereCString s;CPathString path;static TCHAR buff[MAX_PATH];::GetModuleFileName(NULL, buff, MAX_PATH);path = buff;CSize sz = pDC->GetTextExtent("A", 1);int y = 0;s.Format("File Extension: \"%s\"", path.GetFileExtend());pDC->TextOut(2, y, s);y += sz.cy;s.Format("File Name: \"%s\"", path.GetFileName());pDC->TextOut(2, y, s);y += sz.cy;s.Format("File Base: \"%s\"", path.GetFileBase());pDC->TextOut(2, y, s);y += sz.cy;s.Format("File Path: \"%s\"", path.GetFilePath());pDC->TextOut(2, y, s);y += sz.cy;}

引发我的思考 ReverseFind函数的操作对象当path调用时 path作为隐藏的参数传到函数中函数中所有的成员变量和成员函数前面都应该加上这个参数