C++ Qt - QTcpSocket - File not found

Question

I am using Qt and QTcpSocket to create a small chat client/server application.

When I compile my code, the compiler returns the following error:

main.cpp:3:22: fatal error: QTcpSocket: No such file or directory

This refers to #include <QTcpSocket>.

Where is this library located and how can I install it?

Answer 1

You need

QT += network

in your .pro file. Otherwise the module in which those headers are defined/libraries are built won't be loaded.

Answer 2

As I faced the problem and the obvious solution proposed by the documentation and Matt Phillips seemed not to work, I would add to check ALL your .pro files of all your potential subprojects.

As far I'm concerned, addind QT *= network did not work in the main .pro and had to be put in the one actually using the QTcpSocket and QTcpServer objects.