hexviewerdoc.cpp

Visual_C++[1].NET_Bible1 Visual_C++宝典书中的全部源码

// HexViewerDoc.cpp : implementation of the CHexViewerDoc class
//

#include "stdafx.h"
#include "HexViewer.h"

#include "HexViewerDoc.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// CHexViewerDoc

IMPLEMENT_DYNCREATE(CHexViewerDoc, CDocument)

BEGIN_MESSAGE_MAP(CHexViewerDoc, CDocument)
END_MESSAGE_MAP()


// CHexViewerDoc construction/destruction

CHexViewerDoc::CHexViewerDoc()
{
	m_pFile = NULL;
	m_lFileSize = 0L;
}

CHexViewerDoc::~CHexViewerDoc()
{
	if (m_pFile != NULL)
	{
		m_pFile->Close();
		delete m_pFile;
		m_pFile = NULL;
    m_lFileSize = 0L;
	}
}

BOOL CHexViewerDoc::OnNewDocument()
{
	if (!CDocument::OnNewDocument())
		return FALSE;

	// TODO: add reinitialization code here
	// (SDI documents will reuse this document)

	return TRUE;
}




// CHexViewerDoc serialization

void CHexViewerDoc::Serialize(CArchive& ar)
{
	if (ar.IsStoring())
	{
		// TODO: add storing code here
	}
	else
	{
		// TODO: add loading code here
	}
}


// CHexViewerDoc diagnostics

#ifdef _DEBUG
void CHexViewerDoc::AssertValid() const
{
	CDocument::AssertValid();
}

void CHexViewerDoc::Dump(CDumpContext& dc) const
{
	CDocument::Dump(dc);
}
#endif //_DEBUG


// CHexViewerDoc commands

BOOL CHexViewerDoc::OnOpenDocument(LPCTSTR lpszPathName)
{
	if (!CDocument::OnOpenDocument(lpszPathName))
		return FALSE;
	
  // Clean up if a file is already open
  if (m_pFile != NULL)
	{
		m_pFile->Close();
		delete m_pFile;
    m_pFile = NULL;
    m_lFileSize = 0L;
	}

	try
	{
    // Open specified file	
    m_pFile = 
			new CFile(lpszPathName, CFile::modeRead | CFile::typeBinary);
	}
	catch (CFileException* e)
	{
		CString strError;

		strError.Format(_T("Couldn't open file: %d"),
			_sys_errlist[e->m_lOsError]);
		AfxMessageBox(strError);
		return FALSE;
	}

  // Set the file size variable - used in determining the 
  // scroll size of the view
  m_lFileSize = m_pFile->GetLength();
	return TRUE;
}

BOOL CHexViewerDoc::ReadLine(CString& strLine, int nLength, LONG lOffset /*= -1L*/)
{
	LONG lPosition;

	if (lOffset != -1L)
		lPosition = m_pFile->Seek(lOffset, CFile::begin);
	else
		lPosition = m_pFile->GetPosition();

	if (lPosition == -1L)
	{
		TRACE2("CHexViewDoc::ReadLine returns FALSE Seek(%8.81X, %8.81X)\n",
			lOffset, lPosition);
		return FALSE;
	}

	BYTE* pszBuffer = new BYTE[nLength];
	int nReturned = m_pFile->Read(pszBuffer, nLength);

	if (nReturned <= 0)
	{
		TRACE2("CHexViewDoc::ReadLine returns FALSE Read(%d, %d)\n",
			nLength, nReturned);
		delete pszBuffer;
		return FALSE;
	}

	CString strTemp;
	CString strCharsIn;

	strTemp.Format(_T("%8.8lX - "), lPosition);
	strLine = strTemp;

	for (int nIndex = 0; nIndex < nReturned; nIndex++)
	{
		if (nIndex == 0)
			strTemp.Format(_T("%2.2X"), pszBuffer[nIndex]);
		else if (nIndex % 16 == 0)
			strTemp.Format(_T("=%2.2X"), pszBuffer[nIndex]);
		else if (nIndex % 8 == 0)
			strTemp.Format(_T("-%2.2X"), pszBuffer[nIndex]);
		else
			strTemp.Format(_T(" %2.2X"), pszBuffer[nIndex]);

		if (_istprint(pszBuffer[nIndex]))
			strCharsIn += pszBuffer[nIndex];
		else
			strCharsIn += _T('.');
		strLine += strTemp;
	}
	if (nReturned < nLength)
	{
		CString strPadding(_T(' '), 3*(nLength-nReturned));
		strLine += strPadding;
	}
	strLine += _T("  ");
	strLine += strCharsIn;

	delete pszBuffer;
	return TRUE;
}