用C++写一个COPY命令-|COPY,命令|【编程】编程圣殿|工大后院

大鱼发表于 2005-11-27 00:17

用C++写一个COPY命令

不错。支持一下！

Faust 发表于 2005-11-27 00:26

得闲写个format嚟睇下。

wool王 发表于 2005-11-27 00:48

及时雨...感谢楼主...偶正在努力学习C++中...

jackvenn 发表于 2005-11-27 01:35

Originally posted by Faust at 2005-11-27 12:26 AM:
得闲写个format嚟睇下。

等待你的大作

powerwind 发表于 2005-11-27 21:57

//format命令就留给高手写啦.
//改一个可变成type命令

#include<fstream>
#include<iostream>
#include<cstdlib>
using namespace std;
void print_error(const char*,const char* =" ");
int main(int argc,char *argv[]){
const int LEN=256;
char ch;
if(2!=argc)print_error("usage:cat source ");
fstream in(argv,ios::in);
if(!in)
print_error("Can't open",argv);
while(in.getline(ch,LEN))
{
cout<<ch<<endl;
}

if(!in.eof())
print_error("something wrong,mybe the source file is not text file!");
return 0;
}

void print_error(const char*p,const char *p2)
{
cerr<<p<<' '<<p2<<'\n';
exit(1);
}

谁有兴趣把其它的命令写完或完善?!

用程序诠释生命 发表于 2005-12-6 00:57

for(int i=0;*p!='\0';p++)out.put(p);
开始测试没问题,后来发现有时文本文件后面会出现一两个不正常字符.

介个素为虾米捏？

powerwind 发表于 2005-12-13 00:38

#include<fstream>
#include<iostream>
#include<cstdlib>
#include<string>
using namespace std;

void print_error(const char*a,const char* b=" ");
bool equals(string a,string b);
char lastChar(string s);
int main(int argc,char *argv[]){
if(3!=argc)print_error("usage:cp source dest");
string src(argv); string dest(argv);
            const int LEN=1024;
            char ch;    long end;
if(equals(src,dest))print_error("usage:the source can't be the dest");
ifstream in(src.c_str(),ios::binary|ios::ate);
end=in.tellg();
in.seekg(0,ios::beg);
if(!in)
print_error("Can't open",dest.c_str());

if(lastChar(dest)=='\\'||lastChar(dest)=='/'||lastChar(dest)==':')
{
   string filename;
   string name;
   if (lastChar(dest)==':')
   {
      filename=dest;
      filename.append("\\");
      filename.append(src);
   }else filename=strcat(argv,argv);

   const char* p=filename.c_str();
   ofstream out(p,ios::binary);
   if(!out)
   print_error("Can't open the file:",filename.c_str());
   while(in.read(ch,LEN))out.write(ch,LEN);
   char *s=ch;
   int ii=in.gcount();
   int i=0;
   for(;i<ii;i++)out.put(s);
   if(!in.eof())
   print_error("something wrong!");
   cout<<"成功复制了文件: "<<filename<<" "<<end<<" bytes."<<endl;
   in.close();
   out.close();
}
else
{
   ofstream out(argv,ios::binary);
   if(!out)
   print_error("Can't open ",dest.c_str());
   while(in.read(ch,LEN))out.write(ch,LEN);
   int len=in.gcount();
   char *s=ch;
   for(int i=0;i<len;i++)out.put(s);
   if(!in.eof())
   print_error("something wrong!");
   cout<<"成功复制了文件:"<<argv<<" "<<end<<" bytes."<<endl;
   in.close();
   out.close();
}

return 0;
}

bool equals(string str1,string str2)
{
   transform(str1.begin(),str1.end(),str1.begin(),(int(*)(int))tolower);
   transform(str2.begin(),str2.end(),str2.begin(),(int(*)(int))tolower);
   if(str1==str2)return true;
   return false;
}
void print_error(const char* a,const char* b){
cerr<<a<<" "<<b<<endl;
exit(1);
}

char lastChar(string s)
{
string::iterator p;
p=s.end();
return *(p-1);
}

[ Last edited by powerwind on 2005-12-13 at 00:40 ]

superkamiu 发表于 2005-12-26 11:40

晕啊怎么是C++的啊!,有没有高手写一个C的COPY命令啊!命令格式为filecopy filename1 filename2,小弟找了好多资料都没有啊,拜托高手写一个啊!谢谢!

powerwind 发表于 2006-1-6 12:34

对以上的程序稍作修改,可变成一个简单实用的文件加密/解密的程序.
对原文件加密时输入加密密码,生成一个已经是乱码的文件
解密时输入同一个密码则可解密,生成一个和原文件一样内容的文件,否则是再次加密.
当然,可以多次加密,然后反序解密,只要密码及顺序没错,应该可以还原的.

/*encode.cpp*/
//通过简单的异或对文件加密/解密
#include<fstream>
#include<iostream>
#include<cstdlib>
#include<string>
using namespace std;

void print_error(const char*a,const char* b=" ");
bool equals(string a,string b);
char lastChar(string s);
int main(int argc,char *argv[]){
   if(3!=argc)print_error("usage:encode source dest");

   string src(argv); string dest(argv);
   const int LEN=1024; long end;
   char ch;    int seed=0;

   if(equals(src,dest))print_error("usage:the source can't be the dest");
   ifstream in(src.c_str(),ios::binary|ios::ate);
   end=in.tellg();
   in.seekg(0,ios::beg);
   if(!in)
   print_error("Can't open",dest.c_str());

   if(lastChar(dest)=='\\'||lastChar(dest)=='/'||lastChar(dest)==':')
   {
   string filename;
   string name;
   if (lastChar(dest)==':')
   {
      filename=dest;
      filename.append("\\");
      filename.append(src);
   }else filename=strcat(argv,argv);

   const char* p=filename.c_str();
   ofstream out(p,ios::binary);
   if(!out)print_error("Can't open the file:",filename.c_str());
   cout<<"请输入加密/解密的密钥(整数如123)"<<endl;cin>>seed;
   while (in.read(ch,LEN))
   {
      for(int i=0;i<in.gcount();i++)ch=ch^seed;
      out.write(ch,LEN);
   }
   char *s=ch;
   int ii=in.gcount();
   for(int i=0;i<ii;i++){ch=ch^seed;out.put(s);}
   if(!in.eof())
   print_error("something wrong!");
   cout<<"成功保存了文件: "<<filename<<" "<<end<<" bytes."<<endl;
   in.close();
   out.close();
   }
   else
   {
   ofstream out(argv,ios::binary);
   if(!out)print_error("Can't open ",dest.c_str());
   cout<<"请输入加密/解密的密钥(整数如123)"<<endl;cin>>seed;
   while (in.read(ch,LEN))
         {
            for(int i=0;i<in.gcount();i++)ch=ch^seed;
            out.write(ch,LEN);
         }
   int len=in.gcount();
   char *s=ch;
   for(int i=0;i<len;i++){ch=ch^seed;out.put(s);}
   if(!in.eof())
   print_error("something wrong!");
   cout<<"成功保存了文件:"<<argv<<" "<<end<<" bytes."<<endl;
   in.close();
   out.close();
}

   return 0;
   }

bool equals(string str1,string str2)
{
   transform(str1.begin(),str1.end(),str1.begin(),(int(*)(int))tolower);
   transform(str2.begin(),str2.end(),str2.begin(),(int(*)(int))tolower);
   if(str1==str2)return true;
   return false;
}
void print_error(const char* a,const char* b){
   cerr<<a<<" "<<b<<endl;
   exit(1);
   }

char lastChar(string s)
{
string::iterator p;
p=s.end();
return *(p-1);
}

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用C++写一个COPY命令