yeqing

第一：读取为unsigned char*的数组然后写入文件

#include <cstdlib>
#include <iostream>
#include <stdio.h>
#include <fstream>  
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>

using namespace std;

int main(int argc, char *argv[])
{
    if(argc<3)
    {
        cout<<"参数错误"<<endl;
        cout<<"<CMD> <FileNameSrc> <FileNameDis>"<<endl;
        exit(-1);
    }
   
  int nFileSize=0;
//读出二进制文件的大小nFileSize
  struct stat fFileMesg;
  stat(argv[1],&fFileMesg);
  cout<<fFileMesg.st_size<<endl;
  nFileSize=fFileMesg.st_size;
 
//用二进制格式打开读写文件 
  ofstream ifs(argv[2],ios::binary);
  ifstream ofs(argv[1],ios::binary);

   if(!ifs)
    {
       cout<<"打开读取文件["<<argv[1]<<"]失败"<<endl;
       system("PAUSE");
       return -1;
     }

  if(!ofs)
    {
       cout<<"打开写入文件["<<argv[2]<<"]失败"<<endl;
       system("PAUSE");
       return -1;
    }

//动态申请缓冲区，缓冲区大小为文件大小
    unsigned char *NewBuffer=new unsigned char[nFileSize];
//把二进制文件流读写到缓冲区中
    ofs.read((char *)NewBuffer, sizeof(char)*nFileSize);
//把缓冲区写入到文件中
    ifs.write((char *)NewBuffer, sizeof(char)*nFileSize);

    system("PAUSE");
//释放缓冲区和关闭文件流
    ifs.close();
    ofs.close();
    delete NewBuffer;
    return EXIT_SUCCESS;
}

第二：使用强制转换指针四个直接读取

#include <cstdlib>
#include <iostream>
#include <stdio.h>
#include <fstream>  
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>

using namespace std;

int main(int argc, char *argv[])
{
    if(argc<3)
    {
        cout<<"参数错误"<<endl;
        cout<<"<CMD> <FileNameSrc> <FileNameDis>"<<endl;
        exit(-1);
    }
   
 int nFileSize=0;
//读出二进制文件的大小nFileSize
 struct stat fFileMesg;
 stat(argv[1],&fFileMesg);
 cout<<fFileMesg.st_size<<endl;
 nFileSize=fFileMesg.st_size;
 
//用二进制格式打开读写文件 
 ofstream ifs(argv[2],ios::binary);
 ifstream ofs(argv[1],ios::binary);

  if(!ifs)
    {
     cout<<"打开读取文件["<<argv[1]<<"]失败"<<endl;
     system("PAUSE");
     return -1;
     }

 if(!ofs)
    {
     cout<<"打开写入文件["<<argv[2]<<"]失败"<<endl;
     system("PAUSE");
     return -1;
     }

//使用int型强制转换四个字节四个字节读取 
 int nTmp=5;
 int nCount=0;
 while(!ofs.eof())
 {
  ofs.read((char*)(&nTmp), sizeof(nTmp));
//gcount()函数可以返回read读取的直接数
  nCount+=ofs.gcount();
  ifs.write((char*)(&nTmp), sizeof(nTmp));
 }
//关闭文件流
  ifs.close();
  ofs.close();
  system("PAUSE");
  return EXIT_SUCCESS;
}