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最新推荐文章于 2022-02-25 21:57:21 发布

原创最新推荐文章于 2022-02-25 21:57:21 发布 · 504 阅读

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CC 4.0 BY-SA版权

文章标签：

#stream #file #null #加密 #解密 #c

本文介绍了一个地图编辑对话框中实现的地图文件(.map)读写功能及加密过程。涉及文件选择对话框的使用、文件的二进制读写、简单加密解密算法的应用等关键技术点。

void CMapEditDlg::OnButtonRead()
{
// TODO: Add your control notification handler code here
FILE *pFileout; // 文件操作指针
char caption[100] = "";
char stype[100] = "";
char texture[100] = "";
char music[100] = "";
int height = 0;
int width = 0;
int t = 0;
CString str;
// 以二进制方式打开user.dat文件
CFileDialog dlg(TRUE,"*.map",NULL,OFN_HIDEREADONLY|OFN_OVERWRITEPROMPT,"Map Files (*.map)|*.map|",NULL);
if (dlg.DoModal() == IDOK)
{
  str = dlg.GetPathName();
}
else
{
  return;
}
if ((pFileout = fopen(str, "rb")) == NULL)
{
  printf("cannot open file");
  exit(0);
}
// 成块从文件中读取
FILE *stream = tmpfile();//创建临时文件
//解密文件
char ch;

ch=fgetc(pFileout);

while(!feof(pFileout))
{
  ch=ch^(0x100111);
  fputc(ch,stream);
  ch=fgetc(pFileout);
}
fclose(pFileout);
rewind(stream);//移至文件头
fread(&caption, 100, 1, stream);
fread(&stype, 100, 1, stream);
fread(&texture, 100, 1, stream);
fread(&music, 100, 1, stream);
fread(&height, sizeof(height), 1, stream);
fread(&width, sizeof(width), 1, stream);
int mymap[100];
int n = 0;
fread(&mymap, 300, 1, stream);
_rmtmp();//删除临时文件

//向页面写内容
str = caption;
m_cCaption = str;
str = stype;
m_cStype = str;
str = texture;
    m_cTextTure = str;
str = music;
    m_cMusic = str;

m_nWidth = width;
m_nHeight = height;
CString strmapTemp = "";
CString strmap = "";
for (int i = 0; i < width; i++)
{
  for (int j = 0; j < height; j++)
  {
   strmapTemp.Format("%d",mymap[n]);
   strmap += strmapTemp + ",";
   n++;
  }
}
m_cMap = strmap;
UpdateData(FALSE);

}

void CMapEditDlg::OnButtonWrite()
{
// TODO: Add your control notification handler code here
// 信息提交到user.dat中
UpdateData(TRUE);
if (""==m_cCaption)
{
  MessageBox("Caption empty");
  return;
}
    FILE *pFilein;
char caption[100];
//获取叶面内容
strcpy(caption,m_cCaption);

char stype[100];
strcpy(stype,m_cStype);
char texture[100];
strcpy(texture,m_cTextTure);
char music[100];
strcpy(music,m_cMusic);
int height = m_nHeight;
int width = m_nWidth;
int t = 0;
int mymap[100];

for (int i = 0; i < width; i++)
{
  for (int j = 0; j < height; j++)
  {
   mymap[t] = t;
   t++;
  }
}
CString str;
str = "C://"+m_cCaption+".map";
    if ((pFilein = fopen(str, "ab+")) == NULL)
    {
      printf("cannot open file");
      exit(0);
    }
    FILE *stream = tmpfile();//创建临时文件
    fwrite(&caption, 100, 1, stream); // 将内容写入临时文件
fwrite(&stype, 100, 1, stream);
fwrite(&texture, 100, 1, stream);
fwrite(&music, 100, 1, stream);
fwrite(&height, sizeof(height), 1, stream);
fwrite(&width, sizeof(width), 1, stream);
fwrite(&mymap, 300, 1, stream);
rewind(stream);//移至文件头
//加密文件

char ch;
ch=fgetc(stream);

while(!feof(stream))
{
  ch=ch^(0x100111);
  fputc(ch,pFilein);
  ch=fgetc(stream);
}
_rmtmp();//删除临时文件
    fclose(pFilein);

}

加密码还可如下使用，其中感觉密码也需要加密

char ch;
ch=fgetc(stream);
CString s = _T("passwordfsdfasdfasdf");
char *psw = s.GetBuffer(0);
int j= i = 0;
while(psw[++i]);
while(!feof(stream))
{
  ch=ch^psw[j>=i?j=0:j++];

  fputc(ch,pFilein);
  ch=fgetc(stream);
}