string has not been declared, QT
c++, qt
Solution
`string` is in the `std` namespace, so you either need to refer to it as `std::string`, or you need to make the name available in the current scope with `using namespace std;` or `using std::string;`.
Also the header is called `string`, not `string.h`, so include it this way:
#include <string>
Generally you also might want to use QT's `QString` instead of `std::string` if you are using it in connection with QT components that usually take `QString` parameters.
Problem
I am trying to change a certain text box message. It will display my output. This is what I have in my main() ``` #include "form2.h" .... string recvMSG = "random"; ``` 182:: Form2::changeOutput(recvMSG); ... within my form2.h I have: ``` #include <string.h> #include <iostream> #include <stdlib.h> ... void Form2::changeOutput(string s) { QString s1 = i18n(s); output_box.setText(s1); } ``` But i still get: .ui/form2.h:56: error: ‘string’ has not been declared Thanks. Edit:: kk so now its showing:: TCPClient.cpp:182: error: cannot call member function ‘virtual void Form2::changeOutput(std::string)’ without object