Question

C++ and Java Zoo File Manager

I need to complete these files:

#include <iostream>
#include <jni.h>
using namespace std;

void GenerateData() //DO NOT TOUCH CODE IN THIS METHOD
{
JavaVM *jvm; // Pointer to the JVM (Java Virtual Machine)
JNIEnv *env; // Pointer to native interface
//================== prepare loading of Java VM ============================
JavaVMInitArgs vm_args; // Initialization arguments
JavaVMOption* options = new JavaVMOption[1]; // JVM invocation options
options[0].optionString = (char*) "-Djava.class.path="; // where to find java .class
vm_args.version = JNI_VERSION_1_6; // minimum Java version
vm_args.nOptions = 1; // number of options
vm_args.options = options;
vm_args.ignoreUnrecognized = false; // invalid options make the JVM init fail
//=============== load and initialize Java VM and JNI interface =============
jint rc = JNI_CreateJavaVM(&jvm, (void**)&env, &vm_args); // YES !!
delete options; // we then no longer need the initialisation options.
if (rc != JNI_OK) {
// TO DO: error processing...
cin.get();
exit(EXIT_FAILURE);
}
//=============== Display JVM version =======================================
cout << "JVM load succeeded: Version ";
jint ver = env->GetVersion();
cout << ((ver >> 16) & 0x0f) << "." << (ver & 0x0f) << endl;

jclass cls2 = env->FindClass("ZooFileWriter"); // try to find the class
if (cls2 == nullptr) {
cerr << "ERROR: class not found !";
}
else { // if class found, continue
cout << "Class MyTest found" << endl;
jmethodID mid = env->GetStaticMethodID(cls2, "createZooFile", "()V"); // find method
if (mid == nullptr)
cerr << "ERROR: method void createZooFile() not found !" << endl;
else {
env->CallStaticVoidMethod(cls2, mid); // call method
cout << endl;
}
}

jvm->DestroyJavaVM();
cin.get();
}

void AddAnimal()
{
/*
TODO: Write proper code to add an animal to your vector (or array)
*/
}

void RemoveAnimal()
{
/*
TODO: Write proper code to remove an animal from your vector (or array. Remmber to re-allocate proper size if using array)
*/
}

void LoadDataFromFile()
{
/*
TODO: Write proper code to load data from input file (generated using JNI) into vector/array.
*/
}

void SaveDataToFile()
{
/*
TODO: Write proper code to store vector/array to file.
*/
}

void DisplayMenu()
{
/*
TODO: write proper code to display menu to user to select from
*/
}

int main()
{
   GenerateData();
   return 1;
}

Answer 1

// Zooooo.cpp :
//

#include "stdafx.h"
#include <iostream>
#include<string.h>
#include<string>
#include<conio.h>
#include<fstream>
using namespace std;

int i = 0;//veriable to get indexes of array or to use as array size
string Array[1];//Array to store animal

void AddAnimal()
{
  
   Array[0] = { "Lion"};//animal name
  
   cout << "\nAnimal Inserted Successfuly!";
}

void RemoveAnimal()
{
   Array->erase();//array will be erased....completely
   cout << "\nArray Erased Successfuly!";
}

void LoadDataFromFile()
{
   //so, there you need to add your file location as i did...

   string file_name = "jni.txt";//there put the location of your file like-> C:/user/java/jni.txt
   fstream file;
   file.open(file_name);//opening the file
   if (file.fail())//if file address is wrong or file not found then we will give error so put right address here...
       cout << "file opening Error!";
   else
   {
       string line;//string to get line from file
       while (getline(file,line ))//get line from file until the end from data of file...
       {
          
           Array[i] = line;//now line will bw stored to array...
           i++;
       }
       cout << "\nData Loded From File Successful!";
   }

}

void SaveDataToFile()
{
   //you can change the address of file or name that i used here...
   fstream file;
   string file_name = "data_file.txt";//same do here where you want to save data otherwise if file not found you will recieve error
   file.open(file_name);//open file
   if (file.fail())
       cout << "\nFile Opening Failed!";
   else
   {
       int array_size = 0;
       while (array_size<=i)
       {
           file << Array[array_size] << endl;//getting data from array and saving it to file
           array_size++;
       }
       cout << "\nData on File Saved Successfuly!";
   }
}

void DisplayMenu()
{
   int option;
   menue:
   cout << "\n\t\tMENUE\n-------------------------------------\n----------------------------------------";
   cout << "\n\n1.Add Animal\n2.Remove Animal\n3.Load Data From File\n4.Save Data to File\n5.Exit\n\nENTER YOUR OPTION: ";      
   cin >> option;
   switch (option)
   {
   case 1://if user press 1
       AddAnimal();//function will be clled
       _getche();
       goto menue;
   case 2://if press 2
       RemoveAnimal();//function will be clled
       _getche();
       goto menue;
   case 3://if press 3
       LoadDataFromFile();//function will be clled
       _getche();
       goto menue;
   case 4://if press 4
       SaveDataToFile();//function will be clled
       _getche();
       goto menue;
   case 5://if press 5
       return;//stop execution of program will end....
   default://if user will not press right option...
       cout << "\nInvalid Option!";
       cout << "\nPress any key to contniue...";
       _getche();
       goto menue;
   }
}

int _tmain(int argc, _TCHAR* argv[])
{
   DisplayMenu();//calling the menue function to display Menue...
   return 0;
}

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