ifstream写文件（ifstream读取文件内容）

#include <iostream>#include <fstream>#include <sstream>#include <string>
int main() { std::ifstream file("data.txt"); // 假设你的文件名为data.txt if (!file.is_open()) { std::cerr << "无法打开文件" << std::endl; return 1; }
 std::string line; while (getline(file, line)) { std::istringstream iss(line); float x, y, z; char comma; // 用于读取逗号
 if (!(iss >> x >> comma >> y >> comma >> z)) { std::cerr << "读取数据失败" << std::endl; continue; // 跳过这一行 }
 // 现在你有了x, y, z的值，可以进行后续处理 std::cout << "读取的点坐标为: (" << x << ", " << y << ", " << z << ")" << std::endl; }
 file.close(); return 0;}

#include <iostream>#include <fstream>#include <sstream>#include <string>#include <vector>
struct Point { float x, y, z;};
int main() { std::ifstream file("data.txt"); // 假设你的文件名为data.txt if (!file.is_open()) { std::cerr << "无法打开文件" << std::endl; return 1; }
 std::vector<Point> points; // 用于存储点的容器 std::string line; while (getline(file, line)) { std::istringstream iss(line); float x, y, z; char comma; // 用于读取逗号
 if (!(iss >> x >> comma >> y >> comma >> z)) { std::cerr << "读取数据失败" << std::endl; continue; // 跳过这一行 }
 // 将读取的点添加到容器中 points.push_back({x, y, z}); }
 file.close();
 // 可选：打印所有点以验证 for (const auto& point : points) { std::cout << "点坐标: (" << point.x << ", " << point.y << ", " << point.z << ")" << std::endl; }
 return 0;}