文件读写代码

#include <iostream>
#include <fstream>
#include <string>
#include <sstream>

using std::ifstream;
using std::ofstream;
using std::string;
using std::cout;

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

int main(int argc, char** argv) {

	string ifname(argv[1]);
	string ofname(argv[2]);
	string str_size(argv[3]); // M bytes

	int M_Bytes = std::stoi(str_size);

	ifstream fin(ifname.c_str(),std::ios::binary) ;

	int read_size = M_Bytes * 1024 * 1024;

	char * buf = new char[read_size];

	fin.read(buf,read_size);

	fin.close();

	ofstream fout(ofname.c_str(),std::ios::binary);

	fout.write(buf,read_size);

	fout.close();

	cout << ifname << " , " << ofname << std::endl;

	delete buf;

	return 0;
}