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Mira Maslow

How can i modify this Game Lobby code?

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I was trying to modify this Game Looby coding so that the output can save the information into a txt file. However, i was able to save it into txt file, but I don't wanna overwrite the existing information that i've saved before..Everytime i run the cmd, the previous information doesn't appear. Apart from storing information, I also want the game to be able to delete the player's name in the txt file and all the data edited can be displayed in the cmd.. 
Here's the code so far, well not far enough... 

#include <iostream> 
#include <fstream> 
#include <string> 
using namespace std; 

class Player 

public: 
Player(const string& name = ""): m_Name(name), m_pNext(0) {} 
string GetName() const { return m_Name; } 
Player* GetNext() const { return m_pNext; } 
void SetNext(Player* next) { m_pNext = next; } 
private: 
string m_Name; 
Player* m_pNext; //Pointer to next player in list 
}; 
class Lobby 

friend ostream& operator<<(ostream& os, const Lobby& aLobby); 
public: 
Lobby(): m_pHead(0) {} 
~Lobby() { Clear(); } 
void AddPlayer(); 
void RemovePlayer(); 
void Clear(); 
private: 
Player* m_pHead; 
}; 
void Lobby::AddPlayer() 

//create a new player node 
string name; 
ifstream file_in("data.in", ios::in); 
file_in >> name; 

cout << "Please enter the name of the new player: "; 
cin >> name; 

ofstream file_out("data.out", ios::out); 

Player* pNewPlayer = new Player(name); 
//if list is empty, make head of list this new player 
if (m_pHead == 0) 

m_pHead = pNewPlayer; 

//otherwise find the end of the list and add the player there 
else 

Player* pIter = m_pHead; 
while (pIter->GetNext() != 0) 

pIter = pIter->GetNext(); 

pIter->SetNext(pNewPlayer); 
file_out<<"name Age Level selected \n" 
<< name<<endl; 


file_in.close(); 
file_out.close(); 
return; 

void Lobby::RemovePlayer() 

if (m_pHead == 0) 

cout << "The game lobby is empty. No one to remove!\n"; 

else 

Player* pTemp = m_pHead; 
m_pHead = m_pHead->GetNext(); 
delete pTemp; 


void Lobby::Clear() 

while (m_pHead != 0) 

RemovePlayer(); 


ostream& operator<<(ostream& os, const Lobby& aLobby) 

Player* pIter = aLobby.m_pHead; 
os << "\nHere's who's in the game lobby:\n"; 
if (pIter == 0) 

os << "The lobby is empty.\n"; 

else 

while (pIter != 0) 

os << pIter->GetName() << endl; 
pIter = pIter->GetNext(); 


return os; 

int main() 

Lobby myLobby; 
int choice; 
do 

cout << myLobby; 
cout << "\nGAME LOBBY\n"; 
cout << "0 - Exit the program.\n"; 
cout << "1 - Add a player to the lobby.\n"; 
cout << "2 - Remove a player from the lobby.\n"; 
cout << "3 - Clear the lobby.\n"; 
cout << endl << "Enter choice: "; 
cin >> choice; 
switch (choice) 

case 0: cout << "Good-bye.\n"; break; 
case 1: myLobby.AddPlayer(); break; 
case 2: myLobby.RemovePlayer(); break; 
case 3: myLobby.Clear(); break; 
default: cout << "That was not a valid choice.\n"; 


while (choice != 0); 
system("Pause"); 
return 0; 
}

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If you mean you want to append information instead of overwriting it, that can be usually done by setting some flag/option when you open the file.

 

If you mean you want to update only a part of the data and leave the rest, you would probably do something similiar to the following:

1. Read file in (parse all the data, place into data structures)

2. Modify the members you want to change

3. Write the data structures back to the file

 

Im not exactly sure what you need since i cant bother going through the code, but i think what you want is the latter, since the former would only allow you to add data to the end of the file, while the latter allows you to edit any of the file contents.

 

So i suggest you make some kind of class or structure that has:

-Members for the file contents (eg. a vector for a player list or such)

-Methods to:

*Write all the data to a file

*Read all the data from file into the members

 

Which you could then easily use to read the file, modify, and write back.

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If you mean you want to append information instead of overwriting it, that can be usually done by setting some flag/option when you open the file.

 

If you mean you want to update only a part of the data and leave the rest, you would probably do something similiar to the following:

1. Read file in (parse all the data, place into data structures)

2. Modify the members you want to change

3. Write the data structures back to the file

 

Im not exactly sure what you need since i cant bother going through the code, but i think what you want is the latter, since the former would only allow you to add data to the end of the file, while the latter allows you to edit any of the file contents.

 

So i suggest you make some kind of class or structure that has:

-Members for the file contents (eg. a vector for a player list or such)

-Methods to:

*Write all the data to a file

*Read all the data from file into the members

 

Which you could then easily use to read the file, modify, and write back.

i already did the thing tht u suggest, it worked btw.. but my problem now is my program will delete entire file and i cannot delete a certain line in a text file when i run the program.. i have to do manually by deleting the line from the txt file..some say i have to create a different file for different record, but i don't wanna be a copycat because my friend did program that way.. how can i fix that?

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