文本文件操作:
代碼如下:

#include <iostream> #include <fstream> using namespace std;void test01() {const char *fileName = "C:\\Users\\Tom\\Desktop\\hhh.txt";//ifstream ism(fileName, ios::in);//只讀方式打開文件ifstream ism;ism.open(fileName, ios::in);const char *TagetName = "C:\\Users\\Tom\\Desktop\\jjj.txt";ofstream osm(TagetName, ios::out);if (!ism){cout << "打開文件失敗" << endl;return;}//讀文件char ch;while (ism.get(ch)){/*cout << ch;*/osm.put(ch);}ism.close();osm.close();}int main() {test01();return 0; }

追加寫文件操作核心代碼:

ofstream osm(TagetName, ios::out | ios::app);

代碼如下:

#include <iostream> #include <fstream> using namespace std;void test01() {const char *fileName = "C:\\Users\\Tom\\Desktop\\hhh.txt";//ifstream ism(fileName, ios::in);//只讀方式打開文件ifstream ism;ism.open(fileName, ios::in);const char *TagetName = "C:\\Users\\Tom\\Desktop\\jjj.txt";ofstream osm(TagetName, ios::out | ios::app);if (!ism){cout << "打開文件失敗" << endl;return;}//讀文件char ch;while (ism.get(ch)){/*cout << ch;*/osm.put(ch);}ism.close();osm.close();}int main() {test01();return 0; }

二進制文件讀寫:
對象的序列化: 把對象寫入文件
代碼如下:

#include <iostream> #include <fstream> using namespace std;class Person { public:Person(){}Person(int age,int id):age(age),id(id){}void show(){cout << "age = " << age << "id = " << id << endl;}public:int age;int id; };void test01() {const char * fileName = "C:\\Users\\Tom\\Desktop.jjj.txt";Person p1(10, 20), p2(30, 40);//二進制存儲//把p1,p2寫進文件里ofstream osm(fileName, ios::out | ios::binary);osm.write((char*)&p1, sizeof(Person));osm.write((char*)&p2, sizeof(Person));osm.close();ifstream ism(fileName, ios::in | ios::binary);Person p3,p4;ism.read((char *)&p3, sizeof(Person));//從文件讀取數據ism.read((char *)&p4, sizeof(Person));//從文件讀取數據p3.show();p4.show();}int main() {test01();return 0; }

總結

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