Question

我试图从形式的文本文件中读取：

mdasd tgfor,100,23
sfier sdfdor,2,3
mmmmmm,232,452

使用此功能：我可以通过各种方式进行测试但无法设法使其工作：

void StudentRepository::loadStudents(){
    ifstream fl;
    fl.open("studs.txt");
    Student st("",0,0);
    string str,s;
    stringstream ss;
    int i;
    int loc;
    if(fl.is_open()){
        while(getline(fl,str)){
            cout<<"string: "<<str<<endl;

            loc = str.find(",");
            ss << str.substr(0,loc);
            s = ss.str();

            cout<<"name: "<<s<<endl;

            st.setName(s);
            ss.str("");
            str.erase(0,loc+1);

            loc = str.find(",");
            ss << str.substr(0,loc);
            ss >> i;

            cout<<"id:"<<i<<endl;

            st.setId(i);
            ss.str("");
            str.erase(0,loc);
            ss >> i;
            st.setGroup(i);
            ss.str("");

            cout<<"gr:"<<i<<endl;
            students.push_back(st);

            cout<<endl;
        }
    }
    else{
        cout<<"~~~ File couldn't be open! ~~~"<<endl;
    }
    fl.close();
}

但是我可以在跑步中向你展示它只读取第一行的第一个名字而不是一切都是空白的：

string: mqqeeqw tuwqer,23,32 /// ID AND GROUP are initializate with 0 thats 
name: mqqeeqw tuwqer         /// why they have that values... why does it not work?
id:0
gr:0

string: maier tudor,2,3
name: 
id:0
gr:0

string: maier tudor,0,0
name: 
id:0
gr:0

Answer 1

您可以在getline()上使用自定义分隔符std::stringstream，如下所示：

if(fl.is_open()){
    while(getline(fl,str)){
        stringstream ss(str);
        string name, id, gr;
        while(ss) {
            getline(ss, name, ',');  // "," as delimiter
            getline(ss, id, ',');
            getline(ss, gr, ',');
        }

        cout << "name: " << name <<endl;
        cout << "id:" << id << endl;
        cout << "gr:" << gr << endl;
        cout << endl;
    }
}

从文件中读取不读取stringstream

1 个答案: