c++ fstream流seekg()重定位问题

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

int main()
{
	fstream outFile("test.txt");
	if(!outFile.is_open())
	{
		exit(EXIT_FAILURE);
	}

	string str;
	int x = 3;
	while (x--)
	{
		cin >> str;
		str += "\r\n";
		outFile.write(str.c_str(), str.length());
	}
	outFile.close();

	fstream inFile;
	inFile.open("test.txt");
	if (!inFile.is_open())
	{
		cout << "open infile error" << endl;
	}
	
	char buffer[32];
	int size = sizeof(buffer);
	while (inFile.getline(buffer, size))
	{
		cout << buffer << endl;
	}

	cout << "second" << endl;
	inFile.clear();
	inFile.seekg(0, ios::beg);
	string read_line;
	while (getline(inFile, str))
	{
		cout << str << endl;
	}

	inFile.close();

	system("pause");
	return 0;
}