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aideenobrien2000

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Problem with reading into a struct - getline

I want to read information from a text file into an array of structs of type AddWithdrawal. I got this code from another question on this site, but it won't work for me (i don't think that it's anything to do with the code, but something to do with my compiler maybe?) I'm using Visual C++.Net

ifstream inp;
    string line;

    inp.open(FileName);
    for(int i=0;i<2;i++)
    {
        getline(inp,AddWithdrawal[i].Username); //ERRORS ARE WITH THIS LINE

        // use stringstream to read entire line
        getline(inp,line);
        stringstream ss(line);
        ss >> AddWithdrawal[i].BookID;

        cout << AddWithdrawal[i].Username << endl;
        cout << AddWithdrawal[i].BookID << endl;
    }

When I try and compile that code, I get these errors for the first getline statement:
h:\LibraryV1\BookMgr.cpp(114): error C2780: 'std::basic_istream<_Elem,_Traits> &std::getline(std::basic_istream<_Elem,_Traits> &,std::basic_string<_Elem,_Traits,_Alloc> &,const _Elem)' : expects 3 arguments - 2 provided
h:\LibraryV1\BookMgr.cpp(114): error C2784: 'std::basic_istream<_Elem,_Traits> &std::getline(std::basic_istream<_Elem,_Traits> &,std::basic_string<_Elem,_Traits,_Alloc> &)' : could not deduce template argument for 'std::basic_istream<_Elem,_Traits> &' from 'std::ifstream'
h:\LibraryV1\BookMgr.cpp(114): error C2784: 'std::basic_istream<_Elem,_Traits> &std::getline(std::basic_istream<_Elem,_Traits> &,std::basic_string<_Elem,_Traits,_Alloc> &)' : could not deduce template argument for 'std::basic_string<_Elem,_Traits,_Ax> &' from 'char [10]'

Then if I try and add a third argument (my delimiter)
getline(inp,AddWithdrawal[i].Username,'*');
 I get these errors with the same line:
h:\LibraryV1\BookMgr.cpp(114): error C2780: 'std::basic_istream<_Elem,_Traits> &std::getline(std::basic_istream<_Elem,_Traits> &,std::basic_string<_Elem,_Traits,_Alloc> &)' : expects 2 arguments - 3 provided
h:\LibraryV1\BookMgr.cpp(114): error C2784: 'std::basic_istream<_Elem,_Traits> &std::getline(std::basic_istream<_Elem,_Traits> &,std::basic_string<_Elem,_Traits,_Alloc> &,const _Elem)' : could not deduce template argument for 'std::basic_istream<_Elem,_Traits> &' from 'std::ifstream'
h:\LibraryV1\BookMgr.cpp(114): error C2784: 'std::basic_istream<_Elem,_Traits> &std::getline(std::basic_istream<_Elem,_Traits> &,std::basic_string<_Elem,_Traits,_Alloc> &,const _Elem)' : could not deduce template argument for 'std::basic_string<_Elem,_Traits,_Ax> &' from 'char [10]'

This is what I've included at the start of the class
#include <string>
#include <vector>
using namespace std;

#include "Structs.h" //headerfile I've created
#include "BookMgr.h" //headerfile I've created

#include <iostream>
#include <fstream>
#include <sstream> // for stringstream

Thanks
Avatar of AlexFM
AlexFM

What is AddWithdrawal[i].Username type?
SOLUTION
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AlexFM

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Avatar of Axter
Your error shows that Username is of type char Username[10].

You can either change it to type std::string as AlexFM has suggested, or use a temporary std::string variable, and then copy it to Username.
You could also use the input operators, but then you'll only get the first word.

inp >> AddWithdrawal[i].Username;
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Also, make sure that you #include <string> to get this version of the getline function. I know that it doesn't make much sense that the std::string class would be defined at all without #include <string> being there, but I've run into it before.  Good luck.