檢查用戶名和密碼輸入++

Question

這是我的代碼：

` 
void Customer::validate_cust_username_and_password() 
    { 
     string uname, pword; 
     cout << "enter name: " << endl; 
     cin >> uname; 
     cout << "enter password: " << endl; 
     cin >> pword; 
     ifstream myfile("cust_username_and_password.txt"); 
     if (myfile.is_open()) 
     { 
      while (!myfile.eof()) 
      { 

       if (uname == cust_username && pword == cust_password) 
       { 
        cout << "Login successfully." << endl; 
        cust_mainmenu(); 
        break; 
       } 
       else 
       { 
        cout << "Wrong username or password!" << endl; 
        break; 
       } 
      } 

      myfile.close(); 
     } 

    } 
` 

這是存儲用戶名和密碼，另一個代碼：

`void Customer::cust_register_name_and_password() 
{ 
    string un, pw; 
    ofstream myfile("cust_username_and_password.txt", ios::out | ios::app); 
    cout << "Enter Customer Username= " << endl; 
    getline(cin, un); 
    cout << "Enter Customer Password= " << endl; 
    getline(cin, pw); 
    myfile << endl << un << " " << pw << endl; 
    myfile.close(); 

    cout << "Register Successfully." << endl; 
    system("pause"); 
}` 

所以問題是當我輸入之前已存儲在文本文件中的用戶名和密碼時，輸出僅顯示「錯誤的用戶名或密碼！」。

真的很感謝任何人都可以提供幫助。

Answer 1

在您的validate_cust_username_and_password函數中，您從不讀取用戶名和密碼。補充一點：

myfile >> cust_username >> cust_password; 

Answer 2

cust_username和cust_password不會被置在這段代碼的任何地方，所以他們將不會匹配用戶的輸入（除非用戶輸入空字符串）。

Answer 3

cust_username在哪裏神奇地出現。 Paul Daniels參與了嗎？保羅我回來了，你不像大衛布萊恩壞 - 但不是很多

Answer 4

string uname, pword; 
    cout << "enter name: " << endl; 
    cin >> uname; 
    cout << "enter password: " << endl; 
    cin >> pword; 
    ifstream myfile("password.txt"); 
    if (myfile.is_open()) 
    { 
     while (!myfile.eof()) 
     { 

      if (uname == "test" && pword == "0000") 
      { 
       cout << "Login successfully." << endl; 
       cust_mainmenu(); 
       break; 
      } 
      else 
      { 
       cout << "Wrong username or password!" << endl; 
       break; 
      } 
     } 

     myfile.close(); 
    } 

}