讀取文件時不讀字符串流

Question

我試圖從形式的文本文件閱讀：使用此功能

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

：我在各個方面我能想到的，但不能管理到amke它測試工作：

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(); 
} 

但我可以告訴你在礦井運行它比一切的第一行只讀的第一個名字是空白：

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std::stringstream使用getline()與自定義分隔符，這樣的：

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; 
    } 
}