hexdump file
1 Create this program step by step with Visualc++.net or VisualC++ 6.0
We open a file to view the content in hex mode
  • 1) Create a MFC project named hexdump

  • In the applicationtype choose SDI "Single Document"

  • In the interfacefeatures choose Maximized

  • Click on button finish


  • 2) Open file hexdumpView.cpp and search:
    • void ChexdumpView::OnDraw(CDC* /*pDC*/)
  • Change this line in:
    • void ChexdumpView::OnDraw(CDC* pDC)
    info: with VisualC++ 6.0 this line needs no change

  • Add code to have the same function as below

  • Compile and see the text
    • void ChexdumpView::OnDraw(CDC* pDC)
{
	ChexdumpDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	if (!pDoc)
		return;
	// TODO: add draw code for native data here
           pDC->TextOut(100,10,"Hexdump file data");
	// ==>>  code 01	
}
  • open the file hexdumpDoc.cpp

  • insert the variable iFilesize and cBuffer as below

    • info: they are global variables 
    
// hexdumpDoc.cpp : implementation of the ChexdumpDoc class
#include "stdafx.h"
#include "hexdump.h"
#include "hexdumpDoc.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif

unsigned int iFileSize;
char cBuffer[100000];
  • now insert the code in function: Serialize

    • only one line you must insert 
    void ChexdumpDoc::Serialize(CArchive& ar)
{
	if (ar.IsStoring())
	{
		// TODO: add storing code here
	}
	else
	{
		// TODO: add loading code here
		iFileSize = ar.Read(cBuffer,100000);
	}
}
  • Have you tested the program ? all okay?

  • In the file hexdumpView.cpp declare the same variables from hexdumpDoc.cpp as extern

    • we need a few other variables too.
    info: You can declare all as class variables in the header files, but
    we are going the simplest way and we use global variables 
    // hexdumpView.cpp : implementation of the ChexdumpView class
//

#include "stdafx.h"
#include "hexdump.h"

#include "hexdumpDoc.h"
#include "hexdumpView.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif

extern unsigned int iFileSize;
extern char cBuffer[];
char *ptr1,*ptr2;
int xx,yy;
int ii,iLineNumber;
CString str1,strLine;
unsigned char chx;
char cInfoText[20];
  • Now we extend the code in function OnDraw at the hexdumpView.cpp

    • info: if the cBuffer is empty than iFilesize has the value zero and we return
    otherwise we set the pointer ptr1 at the begin of cBuffer and ptr2 at the end 
    	// ==>>  code 01	
	if(iFileSize == 0) return;
	ptr1     = cBuffer;
	ptr2     = ptr1 + iFileSize;	
	// ==>>  code 02
  • we make the address line for the columns
    • 	// ==>>  code 02
	
	strLine.Format("addr    ");
	ii=0; while(ii < 16) {str1.Format("%02X  ", ii++); strLine+=str1;}
	xx=10; yy=30;
	pDC->TextOut(xx,yy,strLine); yy+=25;

	// ==>>  code 03
  • We dump 20 lines
  • The variable iLineNumber multiplied with 16 is our first address in the line
  • cInfoText is the string at the end of the line 
    	// ==>>  code 03
	iLineNumber=0;
	while(iLineNumber < 20)
	{
	strLine.Format("%04X   ",iLineNumber*16);
	ii=0;  while(ii < 16) 
		{ chx=*ptr1++;  str1.Format("%02X  ", chx); strLine+=str1; 
			 if(isalnum(chx)) cInfoText[ii]= chx; else cInfoText[ii]= '.';
		      ii++;
		}

                str1.Format(" %s", cInfoText); strLine+=str1; 
		pDC->TextOut(xx,yy,strLine); yy+=18;

		iLineNumber++;
	}
  • control your OnDraw
  • If all is okay start the program and open a file
  • You can open all files you want
    • void ChexdumpView::OnDraw(CDC* pDC)
{
	ChexdumpDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	if (!pDoc)
		return;

	// TODO: add draw code for native data here
	pDC->TextOut(100,10,"Hexdump file data");

	// ==>>  code 01
	if(iFileSize == 0) return;
	ptr1     = cBuffer;
	ptr2     = ptr1 + iFileSize;	

	// ==>>  code 02
	strLine.Format("addr    ");
	ii=0; while(ii < 16) {str1.Format("%02X  ", ii++); strLine+=str1;}
	xx=10; yy=30;
	pDC->TextOut(xx,yy,strLine); yy+=25;
	
	// ==>>  code 03
	iLineNumber=0;
	while(iLineNumber < 20)
	{
	strLine.Format("%04X   ",iLineNumber*16);
	ii=0;  while(ii < 16) 
		{ chx=*ptr1++;  str1.Format("%02X  ", chx); strLine+=str1; 
			 if(isalnum(chx)) cInfoText[ii]= chx; else cInfoText[ii]= '.';
		      ii++;
		}

                str1.Format(" %s", cInfoText); strLine+=str1; 
		pDC->TextOut(xx,yy,strLine); yy+=18;

		iLineNumber++;
	}

}
  • If you want to have it as below you must insert the following code

  • First you must insert the following line in hexdumpView.cpp OnDraw
    • ChexdumpDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	if (!pDoc)
		return;
	   pDC->TextOut(100,10,"Hexdump file data");

	pDC->SelectObject(&m_font);	//only this line


  • Then insert this lines at the bottom of the page hexdumpView.cpp
    • void ChexdumpView::OnInitialUpdate()
{
	CView::OnInitialUpdate();

if (iFontFlag==0)
{	
	memset(&logfont,0,sizeof(logfont));
	logfont.lfHeight=14;
	logfont.lfWidth=10;
	CString szFont;
	szFont="Courier New";
	lstrcpy(logfont.lfFaceName,szFont);
	VERIFY(m_font.CreateFontIndirect(&logfont));
	SetFont(&m_font);
	iFontFlag=1;
}
	
}

  • Then go to hexdumpView.h
  • In the Implementation insert the code as below 
    • 	CFont m_font;
	LOGFONT logfont;

  • In Generate massage map functions insert the following lines
    • 	public:
	virtual void OnInitialUpdate();