I'm trying to develop a simple application in C++ that sends Files between two computers over LAN. After some research i found out that the QtNetwork Module is the way to go. I do include the QTcpServer and QTcpSocket in my solution.

```
#include <QTcpServer>
#include <QTcpSocket>

```

I added the following path to the Additional Include Directories of my project.

```
C:\Qt\5.14.2\msvc2017_64\include\QtNetwork

```

I then tried a very simple Code. 

```
QTcpSocket* pTcpSocket = new QTcpSocket();

```

I get the "unresolved external symbol" Error which means that the functions are declared but are not defined. It seems to be a problem with the linking or building of the QtNetwork Module. On the Qt Website i found out that one should add the following line 

```
QT += network

```

Since I have no experience with cmake or qmake i'm not sure where to add this line 

Can anyone please recommend a simple example or explain how to correctly use the Module?