Create a file using classes help

Question

Hello,

I am trying to create a program on the cpp droid that will create a csv file and write out onto it. The program runs through just fine, but no file is created which is the ultimate goal. Does anyone see what I could be doing wrong? I would greatly appreciate the help.

Thank you

P.S. I have looked through various questions and tried loading my program code onto the compiler here, the C++ Shell online, and online GDB, but to no avail. Apologies for the long code below.

CODE:

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

class FileCreator
{
ofstream MyFile;
public:
FileCreator(string);
void WriteFile(string, double, double, double, double, double);
void WriteHeader();
void CloseFile();
~FileCreator();
};

inline FileCreator::FileCreator(string title)
{
ofstream MyFile;
cout << "Please enter a title for the document" << endl;
cin >> title;
title += ".csv";
MyFile.open("./Internal storage/Documents/title.c_str()", ios::in | ios::out | ios::trunc);
}
inline void FileCreator::WriteFile(string StoreName, double JanSales, double FebSales, double MarSales, double AprSales, double TotalSales)
{
ofstream MyFile("./Internal storage/Documents/title.c_str()");
TotalSales = JanSales + FebSales + MarSales + AprSales;
MyFile << StoreName << ", " << JanSales << ", " << FebSales << ", " << MarSales << ", " << AprSales << ", " << TotalSales << "\n";
}
inline void FileCreator::WriteHeader()
{
ofstream MyFile("./Internal Storage/Documents/title.c_str()");
MyFile << "Store" << ", " << "January" << ", " << "Feburary" << ", " << "March" << ", " << "April" << ", " << "Total" << "\n";
}
inline void FileCreator::CloseFile()
{
ofstream MyFile("./Internal storage/Documents/title.c_str()");
MyFile.close();
}
inline FileCreator::~FileCreator()
{
}

int main()
{

Answer 1

I didn't read your code thoroughly, so just to check, does the app you are using have permission to access the phone's internal storage?
it could be a permission issue.

Answer 2

the path to internal storage is :
/sdcard/

Answer 3

Soory I did not notice the rest of the code did not paste! Here it is and thank you Bahha, but there is actually no sdcard in the tablet. I checked the permissions as well.

int main()
{
string title, storeName, Chicago, Naperville, Evanston, Oakton, Skokie;
int b, s;
double a, f, j, m, t;
b =0;
t = 0;
cout << "Best Buy Quarterly Earnings Report Generator\n";
cout << "============================================\n\n";
FileCreator BestBuy(title);
BestBuy.WriteHeader();
cout << "How many store's data will you be inputting?" << endl;
cin >> s;
while (b < s)
{
cout << "Please enter the name of the store: " << endl;
cin >> storeName;
cout << "Thank you! Please enter the sales for " << storeName << " by the month.\n";
cout << "January: ";
cin >> j;
cout << "Feburary: ";
cin >> f;
cout << "March: ";
cin >> m;
cout << "April: ";
cin >> a;
cout << "\n";
BestBuy.WriteFile(title, j, f, m, a, t);
cout << "Data for " << storeName << " entered. " << (b + 1) << " of " << s << " stores input.\n";
b += 1;
}
cout << "Thank you for using our application, your file is ready.";
BestBuy.CloseFile();
return 0;
}

Answer 4

sdcard refers to internal storage in many devices.
install a terminal emulator and try :
cd /sdcard
ls - l
you will see the folders and files of internal storage.

Answer 5

Of course, sorry I should know that. I updated the code to this:

MyFile.open(".cd/sdcard/title.c_str()", ios::in | ios::out | ios::trunc);

Am I following you? Just in case I did run it with this and again the program "runs" but does not create a file. Thank you.

Answer 6

no, not cd, I just wanted you to check in terminal not to write it in your code.
the paths should be something like.

MyFile.open("/sdcard/"+ title)
don't include the function inside quotes.

Answer 7

Thank you again and I see where I was going wrong there. So I tried that and now I got the "invalid operands of types ‘const char [9]’ and ‘const char*’ to binary ‘operator+’" error. Looking for solutions to work through this now
Thank you for the help you have been giving!

Answer 8

I made it work here by declaring title variable above inline FileCreator
and assigned it a value inside.

https://code.sololearn.com/cc6f1jBKD16M/?ref=app

Answer 9

in the above code, the path is "/root/" title.csv
in the end I used:
system("ls")
to show that it created a file named title.csv in the root folder.

Answer 10

Ok I see. I am going to review this, thank you and I just need to find the right path now frm my end!

Answer 11

I fixed it, check the new one.
and change paths to
("/sdcard/" + title) so it will work on your phone.

Answer 12

to try it here enter inputs as :

store
1
2
4
5
6
then submit
that will create a file store.csv
put each input in a new line just like above. because your code has 5 cin
1 is for the number of inputs

Answer 13

Bahha, wow that worked perfectly! Thank you so much. I am just reviewing it to understand it completely.

Answer 14

you are welcome 😁

Answer 15

Que programa puedo descargar para programar en Java? Y cuál para hacer app de Android? Descargue Android Studio pero al parecer viene incompleto y no lo he podido terminar de instalar