Add File-reading and helper-methods for phonebook

Main.cpp

@@ -1,3 +1,4 @@
+#include <fstream>
 #include <iostream>
 #include <vector>
 
@@ -99,17 +100,89 @@ typedef struct contacts{
 } Kontaktdaten;
 
 
-void addContact(Kontaktdaten* person, std::vector<Kontaktdaten*> &Telefonbuch) {
-	Telefonbuch.push_back(person);
+void addContact(Kontaktdaten* person, std::vector<Kontaktdaten*> *Telefonbuch) {
+	Telefonbuch->push_back(person);
+	// std::vector<Kontaktdaten *> buch = *Telefonbuch;
+	// buch.push_back(person);
 }
 
-void printAllContacts(std::vector<Kontaktdaten*> Telefonbuch) {
-	for (Kontaktdaten * personpointer: Telefonbuch) {
+void printAllContacts(std::vector<Kontaktdaten*> *Telefonbuch) {
+	for (Kontaktdaten * personpointer: *Telefonbuch) {
 		Kontaktdaten person = *personpointer;
 		std::cout << person.firstName << " " << person.lastName << " " << person.number << std::endl;
 	}
 }
 
+void saveAllContacts(std::vector<Kontaktdaten*> *Telefonbuch, std::string *fileName) {
+	std::ofstream outfile;
+	outfile.open(*fileName);
+
+	for (Kontaktdaten * personpointer: *Telefonbuch) {
+		Kontaktdaten person = *personpointer;
+		outfile << person.firstName << std::endl << person.lastName << std::endl << person.number << std::endl;
+	}
+
+	outfile.close();
+}
+
+int exponentiate(int base, int exponent) {
+	int result = 1;
+	while (exponent > 0) {
+		result *= base;
+		exponent--;
+	}
+	return result;
+}
+
+int intStringToInt(std::string input) {
+	int result = 0;
+
+	int size = input.length();
+	for(int i = 0; i < size; i++) {
+		int digit = input[size - 1 - i] - '0'; // -1 to consider 0-index	// -'0' to get ascii indicies right
+		result += digit * exponentiate(10, i); // shift digit
+	}
+
+	return result;
+}
+
+void readContactsFromFile(std::vector<Kontaktdaten*> *Telefonbuch, std::string *fileName) {
+	std::ifstream infile;
+	infile.open(*fileName);
+
+	if (!infile.is_open()) {
+		std::cout << "File does not exist" << std::endl;
+	}
+
+	std::string line;
+	int counter = 0;
+	Kontaktdaten * personpointer = new Kontaktdaten;
+	while (std::getline(infile, line)) {
+
+		int attribute = counter % 3;
+		counter++;
+
+		switch (attribute) {
+			case 0:
+				personpointer->firstName = line;
+				break;
+			case 1:
+				personpointer->lastName = line;
+				break;
+			case 2:
+				personpointer->number = intStringToInt(line);
+				addContact(personpointer, Telefonbuch);
+				personpointer = new Kontaktdaten;
+				break;
+			default:
+				std::cout << "This should never happen" << std::endl;
+		}
+	}
+
+
+	infile.close();
+}
+
 /*
 Kontaktdaten * createContact(std::string firstName, std::string lastName, int number) {
 	Kontaktdaten person = new Kontaktdaten;
@@ -123,11 +196,17 @@ Kontaktdaten * createContact(std::string firstName, std::string lastName, int nu
 */
 
 void TelefonbuchMain() {
+	std::string fileName = "../IO-Files/Telefonbuch.txt";
 	std::vector<Kontaktdaten*> Telefonbuch;
 
-	Kontaktdaten * Robin = new Kontaktdaten;
-	Kontaktdaten * Saxo = new Kontaktdaten;
-	Kontaktdaten * Jesus = new Kontaktdaten;
+	for (int i=0; i<1; i++) {
+		readContactsFromFile(&Telefonbuch, &fileName);
+		std::cout << "Done with reading " << i << std::endl;
+	}
+
+	auto * Robin = new Kontaktdaten;
+	auto * Saxo = new Kontaktdaten;
+	auto * Jesus = new Kontaktdaten;
 
 	Robin->number = 123456;
 	Robin->firstName = "Robin";
@@ -141,15 +220,30 @@ void TelefonbuchMain() {
 	Jesus->firstName = "Jesus";
 	Jesus->lastName = "Nazarett";
 
-	addContact(Robin, Telefonbuch);
-	addContact(Saxo, Telefonbuch);
-	addContact(Jesus, Telefonbuch);
+	/*
+	*Robin->number = 123456;
+	Robin->firstName = "Robin der Neue";
+	Robin->lastName = "Schnaiter";
 
-	printAllContacts(Telefonbuch);
+	Saxo->number = 987654;
+	Saxo->firstName = "Saxobastian";
+	Saxo->lastName = "Broschianer";
 
-	for (Kontaktdaten * personpointer: Telefonbuch) {
-		delete personpointer;
-	}
+	Jesus->number = 6666666;
+	Jesus->firstName = "Jesus";
+	Jesus->lastName = "Nazarett";
+	*/
+
+	addContact(Robin, &Telefonbuch);
+	addContact(Saxo, &Telefonbuch);
+	addContact(Jesus, &Telefonbuch);
+
+	// printAllContacts(&Telefonbuch);
+	saveAllContacts(&Telefonbuch, &fileName);
+
+	delete Robin;
+	delete Saxo;
+	delete Jesus;
 }
 
 #pragma endregion