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  1. #1
    Join Date
    Apr 2016
    Posts
    1

    Exclamation Help reading txt in a linked list

    I need help because my code saves the txt correctly but at the time of reading it, returns the linked list empty.

    HTML Code:
    #include "Empleado.h"
    
    
    
    Empleado::Empleado() {
    	cedula = "";
    	nombre = "";
    	apellidos = "";
    	nacimiento = "";
    	direccion = "";
    	telefono = "";
    }
    
    Empleado::Empleado(string c, string n, string a, string na, string d, string t) {
    	cedula = c;
    	nombre = n;
    	apellidos = a;
    	nacimiento = na;
    	direccion = d;
    	telefono = t;
    	f = new Fecha();
    }
    
    Empleado::~Empleado() {
    }
    
    // SETS & GETS
    string Empleado::toString() {
    	stringstream s;
    	s << "=================| EMPLEADO |=================" << endl;
    	s << "Cedula: " << cedula << endl;
    	s << "Nombre: " << nombre << endl;
    	s << "Apellidos: " << apellidos << endl;
    	s << "Nacimiento(DD/MM/AAAA):" << f->obtenerFecha(nacimiento) << endl;
    	s << "Direccion: " << direccion << endl;
    	s << "Telefono: " << telefono << endl;
    	s << "==============================================" << endl;
    	return s.str();
    }
    
    
    #include "ListaEmpleado.h"
    
    
    
    ListaEmpleado::ListaEmpleado() {
    	primero = NULL;
    	cantidad = 0;
    }
    
    ListaEmpleado::~ListaEmpleado() {
    	NodoEmpleado* actual = primero;
    	while (actual != NULL) {
    		NodoEmpleado* temp = actual->getSig();
    		delete actual;
    		actual = temp;
    	}
    }
    
    void ListaEmpleado::limpiar() {
    	NodoEmpleado* actual = primero;
    	while (primero) {
    		primero = primero->getSig();
    		delete actual;
    	}
    	actual = NULL;// o colocar delete actual
    	primero = NULL;// o colocar delete primero
    
    	cantidad = 0;
    }
    
    void ListaEmpleado::ingresarEmp(Empleado* emp1) {
    	NodoEmpleado* actual;
    	actual = primero;
    	if (primero == NULL) {
    		primero = new NodoEmpleado(NULL, emp1);
    		cantidad++;
    	}
    	else {
    		while (actual->getSig() != NULL) {
    			actual = actual->getSig();
    		}
    		actual->setSig(new NodoEmpleado(NULL, emp1));
    		cantidad++;
    	}
    }
    
    
    void ListaEmpleado::eliminarEmp(string ced) {
    	NodoEmpleado* anterior = NULL;
    	NodoEmpleado* actual = primero;
    	while (actual && actual->getEmpleado()->getCedula() != ced) {
    		anterior = actual;
    		actual = actual->getSig();
    	}
    	if (!actual || actual->getEmpleado()->getCedula() != ced)//Si no lo encontro
    		return;
    	else {//Borrar el nodo
    		if (!anterior)//si es el primer elemento
    			primero = actual->getSig();
    		else//si es un elemento intermedio o el ultimo
    			anterior->setSig(actual->getSig());
    		delete actual;
    	}
    }
    
    
    bool ListaEmpleado::buscaEmpleado(string c) {
    	NodoEmpleado* actual = primero;
    	while (actual != NULL) {
    		if (actual->getEmpleado()->getCedula() == c) {
    			return true;
    		}
    		else 
    			actual = actual->getSig();
    	}
    	return false;
    }
    
    void ListaEmpleado::modificarEmpleadoNom(string ced, string nuevo) {
    	NodoEmpleado* actual = primero;
    	while (actual->getEmpleado()->getCedula() != ced) {
    		actual = actual->getSig();
    	}
    
    	if (actual->getEmpleado()->getCedula() == ced) {
    		actual->getEmpleado()->setNombre(nuevo);
    	}
    }
    
    void ListaEmpleado::modificarEmpleadoApe(string ced, string nuevo) {
    	NodoEmpleado* actual = primero;
    	while (actual->getEmpleado()->getCedula() != ced) {
    		actual = actual->getSig();
    	}
    
    	if (actual->getEmpleado()->getCedula() == ced) {
    		actual->getEmpleado()->setApellidos(nuevo);
    	}
    }
    
    void ListaEmpleado::modificarEmpleadoNac(string ced, string nuevo) {
    	NodoEmpleado* actual = primero;
    	while (actual->getEmpleado()->getCedula() != ced) {
    		actual = actual->getSig();
    	}
    
    	if (actual->getEmpleado()->getCedula() == ced) {
    		actual->getEmpleado()->setNacimiento(nuevo);
    	}
    }
    
    void ListaEmpleado::modificarEmpleadoDir(string ced, string nuevo) {
    	NodoEmpleado* actual = primero;
    	while (actual->getEmpleado()->getCedula() != ced) {
    		actual = actual->getSig();
    	}
    
    	if (actual->getEmpleado()->getCedula() == ced) {
    		actual->getEmpleado()->setDireccion(nuevo);
    	}
    
    }
    
    void ListaEmpleado::modificarEmpleadoTel(string ced, string nuevo) {
    	NodoEmpleado* actual = primero;
    	while (actual->getEmpleado()->getCedula() != ced) {
    		actual = actual->getSig();
    	}
    
    	if (actual->getEmpleado()->getCedula() == ced) {
    		actual->getEmpleado()->setTelefono(nuevo);
    	}
    }
    
    Empleado* ListaEmpleado::getEmpleado(string ced) {
    	NodoEmpleado* aux = primero;
    	while (aux->getEmpleado()->getCedula() != ced) {
    		aux = aux->getSig();
    	}
    	if (aux->getEmpleado()->getCedula() == ced) {
    		return aux->getEmpleado();
    	}
    	return NULL;
    }
    
    void ListaEmpleado::guardar() {
    	NodoEmpleado* aux = NULL;
    	ofstream file("ReporteEmpleado.txt", ios::out);
    	if (file.is_open()) {
    		aux = primero;
    		file << "Cantidad empleados: " << cantidad << endl;
    		while (aux) {
    			string c = aux->getEmpleado()->getCedula();
    			string n = aux->getEmpleado()->getNombre();
    			string a = aux->getEmpleado()->getApellidos();
    			string na = aux->getEmpleado()->getNacimiento();
    			string d = aux->getEmpleado()->getDireccion();
    			string t = aux->getEmpleado()->getTelefono();
    
    			file << c << endl;
    			file << n << endl;
    			file << a << endl;
    			file << na << endl;
    			file << d << endl;
    			file << t << endl;
    
    			aux = aux->getSig();
    		}
    		file.close();
    	}
    }
    void ListaEmpleado::cargar() {
    	NodoEmpleado* aux = NULL;
    	ifstream file("ReporteEmpleado.txt", ios::in);
    	if (file.is_open()) {
    		aux = primero;
    		int cantidad = 0;
    		int i = 0;
    		while (aux && file.eof()) {
    			//Empleado* emp;
    			string c ;
    			string n ; 
    			string a ; 
    			string na; 
    			string d ;
    			string t ;
    			
    			file>>c;
    			file>>n;
    			file>>a;
    			file>>na;
    			file>>d;
    			file>>t;
    			
    			//emp->setCedula(c);
    			//emp->setNombre(n);
    			//emp->setApellidos(a);
    			//emp->setNacimiento(na);
    			//emp->setDireccion(d);
    			//emp->setTelefono(t);
    
    			ingresarEmp(new Empleado(c,n,a,na,d,t));
    			cantidad++;
    
    			aux = aux->getSig();
    		}
    		file.close();
    	}
    }
    
    string ListaEmpleado::toString() {
    	stringstream s;
    	NodoEmpleado* aux = primero;
    	s << "===================== LISTA DE EMPLEADOS ======================" << endl;
    	while (aux) {
    		s << aux->toString();
    		aux = aux->getSig();
    	}
    	s << "===============================================================" << endl;
    	return s.str();
    }

  2. #2
    GCDEF is offline Elite Member Power Poster
    Join Date
    Nov 2003
    Location
    Florida
    Posts
    12,637

    Re: Help reading txt in a linked list

    That's more code than I feel like wading through, but did you try the debugger?

  3. #3
    VictorN's Avatar
    VictorN is offline Super Moderator Power Poster
    Join Date
    Jan 2003
    Location
    Hanover Germany
    Posts
    20,430

    Re: Help reading txt in a linked list

    Well, I agree with GCDEF.

    Besides:
    Quote Originally Posted by KArroyo View Post
    ... my code saves the txt correctly but at the time of reading it, returns the linked list empty.
    How did you check the data was saved correctly?
    Did you try to investigate which part: read in the data or fill in the "linked list" failed?
    Victor Nijegorodov

  4. #4
    2kaud's Avatar
    2kaud is offline Super Moderator Power Poster
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    Dec 2012
    Location
    England
    Posts
    7,923

    Re: Help reading txt in a linked list

    When posting code, please use code tags rather than HTML tags. Go Advanced, select the code and click '#'.

    You haven't provided the .h files.

    A couple of comments

    One version of empleado constructor sets f using dynamic memory allocation and the default constructor doesn't set f?

    As dynamic memory is used with empleado, the empleado class destructor should free the allocated memory.

    Code:
    while (aux && file.eof()) {
    Do you mean this? The while loop will only process if the file is at the end??? Don't you mean
    Code:
    while (aux && !file.eof()) {
    Also why the test on aux? Shouldn't the linked list be extended for each entry read from the file? So why not simply
    Code:
    while (file) {
    All advice is offered in good faith only. All my code is tested (unless stated explicitly otherwise) with the latest version of Microsoft Visual Studio (using the supported features of the latest standard) and is offered as examples only - not as production quality. I cannot offer advice regarding any other c/c++ compiler/IDE or incompatibilities with VS. You are ultimately responsible for the effects of your programs and the integrity of the machines they run on. Anything I post, code snippets, advice, etc is licensed as Public Domain https://creativecommons.org/publicdomain/zero/1.0/ and can be used without reference or acknowledgement. Also note that I only provide advice and guidance via the forums - and not via private messages!

    C++23 Compiler: Microsoft VS2022 (17.6.5)

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