沉默杀手
文本操作和读写文件
|C++C++ 基础|
Word count: 236|Reading time: 1 min

对字符串根据字符进行分段

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vector<std::string> params;
std::string file = "123.45.abc.0";
std::istringstream param_stream(file);
std::string param;
while(getline(param_stream, param, '.'))
{
    cout << param <<endl;
    params.push_back(param);
}

运行结果:

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123
45
abc
0

读Excel文件

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bool readCSVInput(int N, vector<double> &input_points_x, vector<double> &input_points_y, vector<double> &anchor_points_x, vector<double> &anchor_points_y)
{
    ifstream readCSV("/home/user/data.csv", ios::in);
    int lineNum = 0;
    string lineString;
    vector<vector<string>> stringArray;
    cout << endl;
    while (getline(readCSV, lineString) )
    {
        //cout << lineString << endl;
        if (lineNum > 0)
        {
            stringstream ss(lineString);
            string s;
            vector<string> oneLineStrings;
            while (getline(ss, s, ',') )
                oneLineStrings.push_back(s);
            if (oneLineStrings.size() != 5)
            {
                cout << "ERROR:oneLineStrings.size() != 5" << endl;
                return false;
            }
            else
            {
                input_points_x.push_back(std::stod(oneLineStrings[1]));
                input_points_y.push_back(std::stod(oneLineStrings[2]));
                anchor_points_x.push_back(std::stod(oneLineStrings[3]));
                anchor_points_y.push_back(std::stod(oneLineStrings[4]));
            }
        }
        lineNum++;
    }
    if (N == input_points_x.size())
    {
        return true;
    }
    else
    {
        input_points_x.clear();
        input_points_y.clear();
        anchor_points_x.clear();
        anchor_points_y.clear();
        cout << "ERROR:N == input_points_x.size()" << endl;
        return false;
    }
}