How to use any stream on wstring to extract data - c++

Question

I was reading data from a file using wifstream
the txt file looks like this:
1,2,3,4,5,6,7
2,3,4,5,6,7,8
...
...
each number is an id I needed for my program and comma is the separator
Here is my code
wifstream inputFile(FILE_PATH);
if(inputFile)
{
wchar_t regex;
int id;
while(inputFile)
{
inputFile>>id;
inputFile.get(regex);
cout << id << ", ";
}
inputFile.close();
}
This code works perfectly fine, until I change the reading scheme in which a single line is read at a time, I wanted to do something similar on the line so I can read data from the line while the buffer of the stream pops the data once it's been read like above. But I can't get it working.
Here is my code
wifstream inputFile(FILE_PATH);
wstring line;
if(inputFile)
{
while(!inputFile.eof())
{
std::getline(inputFile, line);
for(int i=0; i<line.length(); i+=2)
{
int id;
wchar_t regex;
wstringstream(line)>>id; // doesn't work as it keep getting the same number
wstringstream(line).get(regex);
cout << id << ", ";
}
cout << endl;
}
inputFile.close();
}
I think the reason it doesn't work is that I'm not using a stream properly and it keeps reading the id at the very first index and never progress no matter how many times I use >> (probably not the right way to use it anyways), I also tried wifstream, no use either.
How am I supposed to get around with this?

Answer 1

You are recreating the wstringstream each time you use it. Move the creation outside the loop:
wifstream inputFile(FILE_PATH);
wstring line;
if(inputFile)
{
while(!inputFile.eof())
{
std::getline(inputFile, line);
wstringstream istring(line);
for(int i=0; i<line.length(); i+=2)
{
int id;
wchar_t regex;
istring>>id;
istring.get(regex);
cout << id << ", ";
}
cout << endl;
}
inputFile.close();
}