c++读写文件的问题

Question

下面这两个源码一个是加密文件一个是解密文件,加密再解密以后总是不能完全和源文件相同,不知道是哪里代码有问题,自己找不到问题,

ifstream input;
char aa[33]="nmca";
char bb[300]="ttaaa";
input.open("777.txt",ios::binary);
ofstream output("888.txt",ios::trunc);
typedef char *(_stdcall *Connect)(char *aa,char *bb,int i);
HINSTANCE hinstDLL=NULL;
hinstDLL=LoadLibrary("crypto.dll");
if (hinstDLL)
{
Connect Proc;
Proc = (Connect)GetProcAddress (hinstDLL,"CryptMe");
if(input && output)
{
while(!input.eof())
{
memset(bb,0,300);
input.getline(bb,300);
AfxMessageBox(bb);
Proc(aa,bb,1);
output<<bb<<endl;
}
}

FreeLibrary(hinstDLL);

这个是解密字符串的程序:

ifstream input;
 char aa[33]="nmca";
 char bb[300]="ttaaa";
 input.open("888.txt",ios::binary);
 ofstream output("999.txt",ios::trunc);

 typedef char *(_stdcall *Connect)(char *aa,char *bb,int i);
 HINSTANCE hinstDLL=NULL;
 hinstDLL=LoadLibrary("crypto.dll");
 if (hinstDLL)
 {
  Connect Proc;
  Proc = (Connect)GetProcAddress (hinstDLL,"CryptMe");
  //int iValue = Proc(m_i);
  
  if(input && output)
  {
   //string line;
   
   while(!input.eof())
   {
    memset(bb,0,300);
    input.getline(bb,300);
    //strcpy(bb,"aa");
    AfxMessageBox(bb);
    Proc(aa,bb,2);
   output<<bb<<endl;
    
   }

   
  }
  
  
  //printf("%s",bb);
  FreeLibrary(hinstDLL);

Answer 1

由于没有函数说明，看这个函数，Proc(aa,bb,2);我只能根据猜测，应该是使用的古典加密算法，否则就不会返回一个和明文一样长的秘文。但问题是，input.getline(bb,300);是否可以保证每次都能把正行的信息都取出来？会不会有一行大于300个字节的情况。另外ofstream output("888.txt",ios::binary|ios::trunc);ofstream output("999.txt",ios::binary|ios::trunc);

---

麻烦把正确答案设为解答。

Answer 2

源文件:

Serial-Number-for-combo; ed-Component;Green-Component;Blue-Component
Serial-Number-for-combo;Red-Component;Green-Component;Blue-Component
Serial-Number-for-combo;Red-Component;Green-Component;Blue-Component
Serial-Number-for-combo;Red-Component;Green-Component;Blue-Component
Serial-Number-for-combo;Red-Component;Green-Component;Blue-Component
Serial-Number-for-combo;Red-Component;Green-Component;Blue-Component
ShowColorScaleGaussianRadius3 = $250000$
ShowColorScaleGaussianRadius4 = $200000$
ShowColorScaleGaussianRadius5 = $175000$
ShowColorScaleGaussianRadius6 = $150000$
ShowColorScaleGaussianRadius7 = $100000$

解密文件:

<b
òØô9
7{▀e█╔ÒÁò½à×#¡gù_è╬&6Q¢*U4▀/▓f╗-Îô╣1»Ùzã&╦KƼuÁíiU`ÍÕÈàÿ
<b
òØô9
7{▀e█╔ÒÁò½à×#▀gù_è╬&6Q¢*U4▀/▓f╗-Îô╣1»Ùzã&╦KƼuÁíiU`ÍÕÈàÿ
<b
òØô9
7{▀e█╔ÒÁò½à×#▀gù_è╬&6Q¢*U4▀/▓f╗-Îô╣1»Ùzã&╦KƼuÁíiU`ÍÕÈàÿ
<b
òØô9
7{▀e█╔ÒÁò½à×#▀gù_è╬&6Q¢*U4▀/▓f╗-Îô╣1»Ùzã&╦KƼuÁíiU`ÍÕÈàÿ
<b
òØô9
7{▀e█╔ÒÁò½à×#▀gù_è╬&6Q¢*U4▀/▓f╗-Îô╣1»Ùzã&╦KƼuÁíiU`ÍÕÈàÿ
<b
òØô9
7{▀e█╔ÒÁò½à×#▀gù_è╬&6Q¢*U4▀/▓f╗-Îô╣1»Ùzã&╦KƼuÁíiU`ÍÕÈàÿ
<o0û▄▓>?6┴-·ÃõÙà¡ëúyÚkå
·üvfßz pÈXõ
<o0û▄▓>?6┴-·ÃõÙà¡ëúyÚkå
²üvfß pÈXõ
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³üvfÔxpÈXõ
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 üvfÔz pÈXõ
<o0û▄▓>?6┴-·ÃõÙà¡ëúyÚkå
■üvfÔ pÈXõ

结果文件

Serial-Number-for-combo; ed-Component;Green-Component;Blue-Component
b
Serial-Number-for-combo;Red-Component;Green-Component;Blue-Component
b
Serial-Number-for-combo;Red-Component;Green-Component;Blue-Component
b
Serial-Number-for-combo;Red-Component;Green-Component;Blue-Component
b
Serial-Number-for-combo;Red-Component;Green-Component;Blue-Component
b
Serial-Number-for-combo;Red-Component;Green-Component;Blue-Component
b
ShowColorScaleGaussianRadius3 = $250000$
Ó
ShowColorScaleGaussianRadius4 = $200000$
Ó
ShowColorScaleGaussianRadius5 = $175000$
Ó
ShowColorScaleGaussianRadius6 = $150000$
Ó
ShowColorScaleGaussianRadius7 = $100000$
Ó
b

Answer 3

可以看出: 单个字符串加密没有问题,文件GETLINE有问题,主要是结束符换行符号处理问题,不知道具体要怎么做才能处理这些字符. 我只是测试怎么加密和解密后跟源文档完全一致,学习函数用法

源码文件在 http://www.yycred.com/test.zip
TestDl1g.cpp是解密,TestDlg.cpp是加密

Answer 4

因为你的文件每一行都是以\r\n结尾的所以加密程序应该改成

ifstream input;
char aa[33]="nmca";
char bb[300]="ttaaa";
input.open("777.txt",ios::binary);
ofstream output("888.txt",ios::trunc);
typedef char *(_stdcall *Connect)(char *aa,char *bb,int i);
HINSTANCE hinstDLL=NULL;
hinstDLL=LoadLibrary("crypto.dll");
if (hinstDLL)
{
Connect Proc;
Proc = (Connect)GetProcAddress (hinstDLL,"CryptMe");
if(input && output)
{
while(!input.eof())
{
memset(bb,0,300);
input.getline(bb,300,'\r');
AfxMessageBox(bb);
Proc(aa,bb,1);
output<<bb<<endl;
}
}

FreeLibrary(hinstDLL);

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麻烦把正确答案设为解答。

Answer 5

谢谢!

input.getline(bb,300,'\r');

才是我正想要找的答案

Answer 6

解密出问题了

还是在换行的地方

Answer 7

啥问题？

---

麻烦把正确答案设为解答。

Answer 8

每行还是多了些乱码字符。

用input.getline(bb,300,'\r');

input.getline(bb,300,'\n');

input.getline(bb,300);

都不行