MFC对TXT文档进行加密解密

admin1

EncodeAndDecode.h

#pragma once
#include "afxdialogex.h"
class EncodeAndDecode
{
public:
        EncodeAndDecode();
        ~EncodeAndDecode();

        void EncodeFile();
        void DecodeFile();       
};




EncodeAndDecode.cpp

#include "stdafx.h"
#include "EncodeAndDecode.h"
#include "afxdialogex.h"

EncodeAndDecode::EncodeAndDecode()
{
}


EncodeAndDecode::~EncodeAndDecode()
{
}
void EncodeAndDecode::EncodeFile()
{

        //读取配置文件

        CString fPath("./data.txt");

        CFile openFile;

        bool bFile = openFile.Open(fPath, CFile::modeRead);

        //同根目录下判断是否打开

        if (!bFile)

        {

                MessageBox(NULL,_T("系统文件丢失请联系管理员"), _T("错误") ,MB_ICONINFORMATION);

                exit(0);

        }

        DWORD openSize = (DWORD)openFile.GetLength();

        char* buf = new char[openSize + 1];

        memset(buf, 0, sizeof(char) * (openSize + 1));

        openFile.Read(buf, openSize);

        openFile.Close();

        //加密算法

        for (unsigned int i = 0; i < openSize; i++)

        {

                buf[i] = 255 - buf[i];

        }

        //写入加密文件

        CString wPath("./moon.xie");

        CFile writeFile;

        writeFile.Open(wPath, CFile::modeWrite | CFile::modeCreate);

        writeFile.Write(buf, openSize);

        writeFile.Close();

        //MessageBox(NULL, _T("已加密"), _T("成功"), MB_ICONINFORMATION);


}
void EncodeAndDecode::DecodeFile()
{

        //读取加密文件

        CString fPath("./moon.xie");

        CFile openFile;

        bool bFile = openFile.Open(fPath, CFile::modeRead);

        //同根目录下判断是否打开

        if (!bFile)

        {

                MessageBox(NULL,_T("系统文件丢失请联系管理员"), _T("错误"), MB_ICONINFORMATION);

                exit(0);

        }

        DWORD openSize = (DWORD)openFile.GetLength();

        char* buf = new char[openSize + 1];

        memset(buf, 0, sizeof(char) * (openSize + 1));

        openFile.Read(buf, openSize);

        openFile.Close();

        //解密算法

        for (unsigned int i = 0; i < openSize; i++)

        {

                buf[i] = 255 - buf[i];

        }

        //写入解密文件

        CString wPath("./data.txt");

        CFile writeFile;

        writeFile.Open(wPath, CFile::modeWrite | CFile::modeCreate);

        writeFile.Write(buf, openSize);

        writeFile.Close();

        //MessageBox(NULL,_T("已解密"), _T("成功"), MB_ICONINFORMATION);




}