编写c++读取ply格式的点云

以下是一个简单的C++程序，可以读取PLY格式的点云数据：

#include <iostream>
#include <fstream>
#include <vector>
#include <string>

using namespace std;

struct Point {
    float x, y, z;
};

struct PlyHeader {
    int vertexCount;
};

int main(int argc, char* argv[]) {
    if (argc < 2) {
        cerr << "Usage: " << argv[0] << " <ply file>" << endl;
        return 1;
    }

    ifstream file(argv[1], ios::binary);
    if (!file.is_open()) {
        cerr << "Error opening file " << argv[1] << endl;
        return 1;
    }

    string line;
    PlyHeader header;
    vector<Point> points;

    // Read header
    while (getline(file, line)) {
        if (line == "end_header") {
            break;
        }

        if (line.substr(0, 14) == "element vertex") {
            header.vertexCount = stoi(line.substr(15));
        }
    }

    // Read vertex data
    float x, y, z;
    for (int i = 0; i < header.vertexCount; ++i) {
        file.read((char*)&x, sizeof(float));
        file.read((char*)&y, sizeof(float));
        file.read((char*)&z, sizeof(float));
        points.push_back({ x, y, z });
    }

    file.close();

    cout << "Read " << points.size() << " points from file " << argv[1] << endl;

    return 0;
}

该程序假定PLY文件的第一个元素为顶点，并且顶点只包含x、y、z三个属性。如果PLY文件包含其他元素或属性，程序需要相应地进行修改