12view.cpp

文本文件和二进制文件的区别。用文本方式读写文件和以二进制方式读写文件的注意事项。C++对文件读写的支持

// 12View.cpp : implementation of the CMy12View class
//

#include "stdafx.h"
#include "12.h"

#include "12Doc.h"
#include "12View.h"
//#include <fstream.h>

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CMy12View

IMPLEMENT_DYNCREATE(CMy12View, CView)

BEGIN_MESSAGE_MAP(CMy12View, CView)
	//{{AFX_MSG_MAP(CMy12View)
	ON_COMMAND(IDM_FILE_WRITE, OnFileWrite)
	ON_COMMAND(IDM_FILE_READ, OnFileRead)
	//}}AFX_MSG_MAP
	// Standard printing commands
	ON_COMMAND(ID_FILE_PRINT, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_DIRECT, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_PREVIEW, CView::OnFilePrintPreview)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMy12View construction/destruction

CMy12View::CMy12View()
{
	// TODO: add construction code here

}

CMy12View::~CMy12View()
{
}

BOOL CMy12View::PreCreateWindow(CREATESTRUCT& cs)
{
	// TODO: Modify the Window class or styles here by modifying
	//  the CREATESTRUCT cs

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CMy12View drawing

void CMy12View::OnDraw(CDC* pDC)
{
	CMy12Doc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
}

/////////////////////////////////////////////////////////////////////////////
// CMy12View printing

BOOL CMy12View::OnPreparePrinting(CPrintInfo* pInfo)
{
	// default preparation
	return DoPreparePrinting(pInfo);
}

void CMy12View::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add extra initialization before printing
}

void CMy12View::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add cleanup after printing
}

/////////////////////////////////////////////////////////////////////////////
// CMy12View diagnostics

#ifdef _DEBUG
void CMy12View::AssertValid() const
{
	CView::AssertValid();
}

void CMy12View::Dump(CDumpContext& dc) const
{
	CView::Dump(dc);
}

CMy12Doc* CMy12View::GetDocument() // non-debug version is inline
{
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CMy12Doc)));
	return (CMy12Doc*)m_pDocument;
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CMy12View message handlers

void CMy12View::OnFileWrite() 
{
	// TODO: Add your command handler code here
	/* FILE *pFile=fopen("1.txt","w");
	fwrite("http://www.sunxin,org",1,strlen("http://www.sunxin,org"),pFile);
	fclose(pFile);
	fflush(pFile); */
/*	FILE *pFile=fopen("2.txt","w");
	char ch[3];
	ch[0]='a';
	ch[1]=10;
	ch[2]='b';
	fwrite(ch,1,3,pFile);
	fclose(pFile);*/
    /*  FILE *pFile=fopen("3.txt","w");
	  int i=98341;
	  char ch[5];
	  itoa(i,ch,10);
	  fwrite(ch,1,5,pFile);
	  fclose(pFile);
    */
/*	ofstream ofs("4.txt");
	ofs.write("http://www.xunxin.org",strlen("http://www.xunxin.org"));
	ofs.close();
  */
/*	HANDLE hFile;
	hFile=CreateFile("5.txt",GENERIC_WRITE,0,NULL,
		CREATE_NEW,FILE_ATTRIBUTE_NORMAL,NULL);
	DWORD dwWrites;
	WriteFile(hFile,"http://www.sunxin.org",strlen("http://www.sunxin.org"),
		&dwWrites,NULL);
	CloseHandle(hFile);
*/
	CFile file("6.txt",CFile::modeCreate|CFile::modeWrite);
	file.Write("http://www.xunxin.org",strlen("http://www.xunxin.org"));
	file.Close();
  }

void CMy12View::OnFileRead() 
{
	// TODO: Add your command handler code here
  /*	FILE *pFile=fopen("1.txt","r");
	char ch[100];
	memset(ch,0,100);
	fread(ch,1,100,pFile);
	MessageBox(ch);
	fclose(pFile); */
	/*	FILE *pFile=fopen("2.txt","r");
        char ch[100];
		fread(ch,1,3,pFile);
		ch[3]=0;
		MessageBox(ch);
		fclose(pFile);*/
/*	ifstream ifs("4.txt");
	char ch[100];
	memset(ch,0,100);
	ifs.read(ch,100);
	ifs.close();
	MessageBox(ch);
*/
/*	HANDLE hFile;
	hFile=CreateFile("5.txt",GENERIC_READ,0,NULL,
		OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);
	char ch[100];
	DWORD dwReads;
	ReadFile(hFile,ch,100,&dwReads,NULL);
	CloseHandle(hFile);
	MessageBox(ch);
  */
	CFile file("6.txt",CFile::modeRead);
	char *pBuf;
	DWORD dwFilelen;
	dwFilelen=file.GetLength();
	pBuf=new char[dwFilelen+1];
	pBuf[dwFilelen]=0;
	file.Read(pBuf,dwFilelen);
	file.Close();
	MessageBox(pBuf);
	}