Keyboard input on unsigned char? - c++

Question

uchar szPlaintext[128]; //dato da criptare
cout << "\nInserisci testo : ";
getline(cin, szPlaintext);
I tried it with a getline (cin, szPlaintext); but I have a lot of errors. I compile with VS2015.
Premise that I am trying to implement an AES (not mine), to my program; the uchar declaration was in this way.
uchar szPlaintext [128] = "text that I want to insert";
The errors are:
1>d:\download\scuola\c++\virtualaes\virtualaes\encrypt.cpp(32): error C2672: 'getline': no matching overloaded function found
1>d:\download\scuola\c++\virtualaes\virtualaes\encrypt.cpp(32): 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,_Alloc> &' from 'uchar [128]'
1> c:\program files (x86)\microsoft visual studio 14.0\vc\include\string(157): note: see declaration of 'std::getline'
1>d:\download\scuola\c++\virtualaes\virtualaes\encrypt.cpp(32): 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
1> c:\program files (x86)\microsoft visual studio 14.0\vc\include\string(146): note: see declaration of 'std::getline'
1>d:\download\scuola\c++\virtualaes\virtualaes\encrypt.cpp(32): 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,_Alloc> &' from 'uchar [128]'
1> c:\program files (x86)\microsoft visual studio 14.0\vc\include\string(126): note: see declaration of 'std::getline'
1>d:\download\scuola\c++\virtualaes\virtualaes\encrypt.cpp(32): 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
1> c:\program files (x86)\microsoft visual studio 14.0\vc\include\string(73): note: see declaration of 'std::getline'
Pietrob0b
Utente Junior
Messaggi: 36
Iscritto il: 10 dic 2015, 20:44

Answer 1

std::getline takes a std::string reference, not a raw pointer.
string sPlaintext;
cout << "\nInserisci testo : ";
getline(cin, sPlaintext);
uchar* szPlaintext = (uchar*) sPlaintext.c_str(); //dato da criptare

Answer 2

As others have already pointed out std::getline takes a reference of std::string not "char *" , so your program has failed to compile .
Below are the two version of std::getline .
istream& getline (istream& is, string& str, char delim);
istream& getline (istream& is, string& str);
Now , how to make it work assuming you want input string in char* .Follow the below program .
// Example program
#include <iostream>
#include <string>
#include<cstring>
int main()
{
char szPlaintext[128]; //dato da criptare
std::cout << "\nInserisci testo : ";
std::string str ;
getline(std::cin, str);
strcpy(szPlaintext,str.c_str());
std::cout << szPlaintext;
}