C++ 读取大文件函数

void copyfile()
{
	char f_buf[1024] = { 0 };
	ifstream infile("H:\\Temp\\cmd.exe", ios::in | ios::binary);
	ofstream outfile("H:\\getfile\\cmd.exe", ios::app | ios::binary);
	if (!infile)
	{

	}
	while (!infile.eof())
	{
		infile.read(f_buf, sizeof(f_buf));
		outfile.write(f_buf, sizeof(f_buf));
	}
	infile.close();
	outfile.close();
	cout << "去看看有没有文件" << endl;
}