求大神啊，C++ new指针应用错误，程序奔溃。

SureGOGOGO 2016-05-30 08:57:50

MFC做的一个RC4的一个加密解密程序，采用new动态分配内存，分配后用delete程序就奔溃。
界面如下:

输入后的结果如下:

程序的RC4_sysDlg.cpp源代码如下:

// RC4_sysDlg.cpp : implementation file

//



#include "stdafx.h"

#include "RC4_sys.h"

#include "RC4_sysDlg.h"

#include "RC4.h"



#ifdef _DEBUG

#define new DEBUG_NEW

#undef THIS_FILE

static char THIS_FILE[] = __FILE__;

#endif



/////////////////////////////////////////////////////////////////////////////

// CAboutDlg dialog used for App About



class CAboutDlg : public CDialog

{

public:

	CAboutDlg();



// Dialog Data

	//{{AFX_DATA(CAboutDlg)

	enum { IDD = IDD_ABOUTBOX };

	//}}AFX_DATA



	// ClassWizard generated virtual function overrides

	//{{AFX_VIRTUAL(CAboutDlg)

	protected:

	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support

	//}}AFX_VIRTUAL



// Implementation

protected:

	//{{AFX_MSG(CAboutDlg)

	//}}AFX_MSG

	DECLARE_MESSAGE_MAP()

};



CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)

{

	//{{AFX_DATA_INIT(CAboutDlg)

	//}}AFX_DATA_INIT

}



void CAboutDlg::DoDataExchange(CDataExchange* pDX)

{

	CDialog::DoDataExchange(pDX);

	//{{AFX_DATA_MAP(CAboutDlg)

	//}}AFX_DATA_MAP

}



BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)

	//{{AFX_MSG_MAP(CAboutDlg)

		// No message handlers

	//}}AFX_MSG_MAP

END_MESSAGE_MAP()



/////////////////////////////////////////////////////////////////////////////

// CRC4_sysDlg dialog



CRC4_sysDlg::CRC4_sysDlg(CWnd* pParent /*=NULL*/)

	: CDialog(CRC4_sysDlg::IDD, pParent)

{

	//{{AFX_DATA_INIT(CRC4_sysDlg)

		// NOTE: the ClassWizard will add member initialization here

	//}}AFX_DATA_INIT

	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32

	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);

}



void CRC4_sysDlg::DoDataExchange(CDataExchange* pDX)

{

	CDialog::DoDataExchange(pDX);

	//{{AFX_DATA_MAP(CRC4_sysDlg)

	DDX_Control(pDX, IDC_type, m_type);

	DDX_Control(pDX, IDC_weishu, m_weishu);

	//}}AFX_DATA_MAP

}



BEGIN_MESSAGE_MAP(CRC4_sysDlg, CDialog)

	//{{AFX_MSG_MAP(CRC4_sysDlg)

	ON_WM_SYSCOMMAND()

	ON_WM_PAINT()

	ON_WM_QUERYDRAGICON()

	ON_BN_CLICKED(IDC_BUTTON3, OnExecute)

	ON_WM_TIMER()

	//}}AFX_MSG_MAP

END_MESSAGE_MAP()



/////////////////////////////////////////////////////////////////////////////

// CRC4_sysDlg message handlers



BOOL CRC4_sysDlg::OnInitDialog()

{

	CDialog::OnInitDialog();



	// Add "About..." menu item to system menu.



	// IDM_ABOUTBOX must be in the system command range.

	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);

	ASSERT(IDM_ABOUTBOX < 0xF000);



	CMenu* pSysMenu = GetSystemMenu(FALSE);

	if (pSysMenu != NULL)

	{

		CString strAboutMenu;

		strAboutMenu.LoadString(IDS_ABOUTBOX);

		if (!strAboutMenu.IsEmpty())

		{

			pSysMenu->AppendMenu(MF_SEPARATOR);

			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);

		}

	}



	// Set the icon for this dialog.  The framework does this automatically

	//  when the application's main window is not a dialog

	SetIcon(m_hIcon, TRUE);			// Set big icon

	SetIcon(m_hIcon, FALSE);		// Set small icon



   m_type.AddString("文件");

   m_type.AddString("字符串");

   m_type.SetCurSel(1);

   m_weishu.AddString("256位");

   m_weishu.AddString("128位");

   m_weishu.AddString("56位");

   m_weishu.SetCurSel(1);

   ((CButton*)GetDlgItem(IDC_jiami))->SetCheck(TRUE);//选上

	// TODO: Add extra initialization here

	

	return TRUE;  // return TRUE  unless you set the focus to a control

}



void CRC4_sysDlg::OnSysCommand(UINT nID, LPARAM lParam)

{

	if ((nID & 0xFFF0) == IDM_ABOUTBOX)

	{

		CAboutDlg dlgAbout;

		dlgAbout.DoModal();

	}

	else

	{

		CDialog::OnSysCommand(nID, lParam);

	}

}



// If you add a minimize button to your dialog, you will need the code below

//  to draw the icon.  For MFC applications using the document/view model,

//  this is automatically done for you by the framework.



void CRC4_sysDlg::OnPaint() 

{

	if (IsIconic())

	{

		CPaintDC dc(this); // device context for painting



		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);



		// Center icon in client rectangle

		int cxIcon = GetSystemMetrics(SM_CXICON);

		int cyIcon = GetSystemMetrics(SM_CYICON);

		CRect rect;

		GetClientRect(&rect);

		int x = (rect.Width() - cxIcon + 1) / 2;

		int y = (rect.Height() - cyIcon + 1) / 2;



		// Draw the icon

		dc.DrawIcon(x, y, m_hIcon);

	}

	else

	{

		CDialog::OnPaint();

	}

}



// The system calls this to obtain the cursor to display while the user drags

//  the minimized window.

HCURSOR CRC4_sysDlg::OnQueryDragIcon()

{

	return (HCURSOR) m_hIcon;

}



void CRC4_sysDlg::OnExecute() 

{

	CString key_str; //密匙

	CString Input_str; //输入的文本

	CString Output_str; //输出结果

	int nDex=256; //选中的位数

	//char c_key[256];

	

	char c_type='3';

	

	CString num_str;//选中的文本

	GetDlgItem(IDC_EDIT1)->GetWindowText(key_str); 

	GetDlgItem(IDC_EDIT3)->GetWindowText(Input_str); 

	GetDlgItem(IDC_EDIT2)->GetWindowText(Output_str); 

	if(key_str==""||Input_str=="")

		MessageBox("密匙和输入均不能为空!","错误信息",MB_ICONERROR);

	else

	{

		m_weishu.GetWindowText(num_str);

		if(num_str=="256位")

		{

			nDex=256;

			c_type='2';

		}

		if(num_str=="56位")

		{

			nDex=56;

			c_type='0';

		}

		if(num_str=="128位")

		{

			nDex=128;

			c_type='1';

		}

		//分配内存空间

		char *sbox= new  char [nDex]; //sBox

		char *s_box= new  char [nDex]; //sBox备份

		char *key= new char [nDex]; //密匙

		char *pData= new  char [nDex]; //输入的密文内容

	

		

		if(sbox) memset(sbox,0,nDex);

		if(key)	  strcpy(key,key_str.GetBuffer(key_str.GetLength())); //初始化密匙

	    if(pData) strcpy(pData,Input_str.GetBuffer(Input_str.GetLength())); //初始化密文

		Rc.rc4_init(sbox,pData,c_type,strlen(key)); //初始化sbox

	      if(s_box)

		for(int i=0;i<nDex;i++)

		s_box[i]=sbox[i]; //保存sbox

		//GetDlgItem(IDC_EDIT2)->SetWindowText(s_box);

		Rc.rc4_crypt(sbox,pData,c_type,strlen(key));

		GetDlgItem(IDC_EDIT2)->SetWindowText(sbox);

		delete []s_box;

		delete []sbox;

		delete []pData;

		delete []key;





	}



}



void CRC4_sysDlg::OnTimer(UINT nIDEvent) 

{

switch(nIDEvent)

{

case 1:

	break;

default:

	break;

}

	CDialog::OnTimer(nIDEvent);

}

头文件RC4_sysDlg.h的代码如下:

// RC4_sysDlg.h : header file

//



#if !defined(AFX_RC4_SYSDLG_H__58E34607_0269_457B_A64C_0F11B7FB7552__INCLUDED_)

#define AFX_RC4_SYSDLG_H__58E34607_0269_457B_A64C_0F11B7FB7552__INCLUDED_

#include "Rc4.h"

#define low 0

#define mid 1

#define large 2

#if _MSC_VER > 1000

#pragma once

#endif // _MSC_VER > 1000





/////////////////////////////////////////////////////////////////////////////

// CRC4_sysDlg dialog



class CRC4_sysDlg : public CDialog

{

// Construction

public:

	CRC4_sysDlg(CWnd* pParent = NULL);	// standard constructor



// Dialog Data

	//{{AFX_DATA(CRC4_sysDlg)

	enum { IDD = IDD_RC4_SYS_DIALOG };

	CComboBox	m_type;

	CComboBox	m_weishu;

	//}}AFX_DATA



	// ClassWizard generated virtual function overrides

	//{{AFX_VIRTUAL(CRC4_sysDlg)

	protected:

	virtual void DoDataExchange(CDataExchange* pDX);	// DDX/DDV support

	//}}AFX_VIRTUAL



// Implementation

protected:

	HICON m_hIcon;

	Rc4 Rc;





	// Generated message map functions

	//{{AFX_MSG(CRC4_sysDlg)

	virtual BOOL OnInitDialog();

	afx_msg void OnSysCommand(UINT nID, LPARAM lParam);

	afx_msg void OnPaint();

	afx_msg HCURSOR OnQueryDragIcon();

	afx_msg void OnExecute();

	afx_msg void OnTimer(UINT nIDEvent);

	//}}AFX_MSG

	DECLARE_MESSAGE_MAP()

};



//{{AFX_INSERT_LOCATION}}

// Microsoft Visual C++ will insert additional declarations immediately before the previous line.



#endif // !defined(AFX_RC4_SYSDLG_H__58E34607_0269_457B_A64C_0F11B7FB7552__INCLUDED_)

RC4加密类的源代码如下:

// Rc4.cpp: implementation of the Rc4 class.

//

//////////////////////////////////////////////////////////////////////



#include "stdafx.h"

#include "RC4_sys.h"

#include "Rc4.h"

#include <stdio.h>

#include <stdlib.h>

#include <string.h>



#ifdef _DEBUG

#undef THIS_FILE

static char THIS_FILE[]=__FILE__;

#define new DEBUG_NEW

#endif



//////////////////////////////////////////////////////////////////////

// Construction/Destruction

//////////////////////////////////////////////////////////////////////

Rc4::Rc4()

{



}



Rc4::~Rc4()

{



}





void Rc4::rc4_init( char *s,  char *data,char strong,int Len) { //初始化函数

 int i,j,jiamilen;

 if(strong=='2') jiamilen=256;

 if(strong=='1') jiamilen=128;

 if(strong=='0') jiamilen=56;

 //unsigned char k[jiamilen] = {0},tmp;

 char *k=new  char[jiamilen];

 memset(k,0,jiamilen);

  char tmp;



 for(i = 0;i < jiamilen;i++) {

  s[i] = i;

  k[i] = data[i%Len];

 }

 for(i = 0; i < jiamilen; i++) {

  j = (j + s[i] + k[i])%Len;

  tmp = s[i];

  s[i] = s[j]; //交换s[i]和s[j]

  s[j] = tmp;

 }

 delete []k;

}



void Rc4::rc4_crypt( char *s,  char *Data,char strong,int Len) { //加解密

 int i = 0, j = 0, t = 0;

 int jiamilen;

 if(strong=='2') jiamilen=256;

 if(strong=='1') jiamilen=128;

 if(strong=='0') jiamilen=56;

 unsigned long k = 0;

 unsigned char tmp;

 for(k = 0;k <Len;k++) {

  i = (i + 1)%jiamilen;

  j = (j + s[i])%jiamilen;

  tmp = s[i];

  s[i] = s[j]; //交换s[x]和s[y]

  s[j] = tmp;

  t = (s[i] + s[j])%jiamilen;

  Data[k] ^= s[t];

 }

}