How to use/include the QtNetwork Module

JohnSRV

Hello Everyone,

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?

Thanks!!

jsulm

@JohnSRV said in How to use/include the QtNetwork Module:

i'm not sure where to add this line

Open your pro file and add that line there other "QT += " lines are.

VRonin

if you are using a CMake project add
find_package(Qt5 COMPONENTS Network REQUIRED) and then target_link_libraries(MyApp PUBLIC Qt5::Network) where MyApp is the name of your target

JohnSRV

Hey,
thanks for the answers. I'm actually using a Visual Studio 2017 Project and that's why I'm confused. There's no pro File under the Path of my Project :/.
Is it at all possible to use the Qt Network Module in a visual Studio 2017 Project ??

Thanks !

VRonin

If you have the Qt Visual Studio Tools installed then right click on your project, go into the Qt Project property and in the modules tab put a tick next to Network

JohnSRV

no I don't have the Qt VS Tools installed. How can i install them? Thanks !!

JohnSRV

Update

Now I installed the QT Vs Tools for VS 2017. Do I have to start new Project to add the Network Module or can i add it to my already exisiting VS Project?

VRonin

Last time I used the VS Tools (that was with VS 2013) it required to start a project from scratch, not sure if they introduced a "convert to qt project" feature since