代码 
//还不支持中文文件名

#include <iostream>
#include <fstream>
#include <strstream>
using namespace std;

int main(int argc,char *argv[])
{
    if (argc!=3)
    {
        exit(0);
    }
    ifstream source(argv[1],ios::binary|ios::in|ios::ate);
    ofstream dest(argv[2],ios::binary|ios::out);
    if (source.is_open())
    {
        ifstream::pos_type size=source.tellg();
        cout<<size<<"bytes";
        char * memblock = new char [size];
        source.seekg(0,ios::beg);//pointer return to the begin 
        source.read(memblock,size);
        source.close();//source is used up



        dest.write(memblock,size);
        dest.close();
    }

    return 0;
}
//http://www.cplusplus.com/doc/tutorial/files/