Unresolved external Error QtMetaObject

JohnSRV

Hello Everyone,

I'm trying to implement a simple server client application in QT. I'm using Visual Studio 2017.
Here's the Header File to my client class.

#pragma once
#ifndef  Client_H
#define	Client_H

#include <QTcpSocket>


class Client : public QObject 
{	Q_OBJECT

public: 
	 explicit Client (QObject *parent = 0);
	
	 void Connect(); 

signals: 

public slots: 

private:
	QTcpSocket *socket; 
};
#endif

and here's the code to Client.cpp

#include "Client.h"

Client::Client(QObject *parent) :
	QObject(parent)
{
}

void Client::Connect()
{
	socket = new QTcpSocket(this); 
	socket->connectToHost("192.168.10.10", 8016); 
	if (socket->waitForConnected(3000))
	{
		printf("COnnected");
	}
	else
	{
		printf("Not Connected");
	}
}

as you can see it's pretty simple. In my Main.cpp i create an instance of the client class and then call the function Connect():

Client Test;
Test.Connect();

When building my project i get the following errors

1>Client.obj : error LNK2001: unresolved external symbol "public: virtual struct QMetaObject const * __cdecl Client::metaObject(void)const " (?metaObject@Client@@UEBAPEBUQMetaObject@@XZ)
1>Client.obj : error LNK2001: unresolved external symbol "public: virtual void * __cdecl Client::qt_metacast(char const *)" (?qt_metacast@Client@@UEAAPEAXPEBD@Z)
1>Client.obj : error LNK2001: unresolved external symbol "public: virtual int __cdecl Client::qt_metacall(enum QMetaObject::Call,int,void * *)" (?qt_metacall@Client@@UEAAHW4Call@QMetaObject@@HPEAPEAX@Z)

I know that this Error means that the functions are declared but the definition is missing. I just don't know where to find these definitions and which file i have to link to get rid of these errors.

Thank you

mrjj

Hi
Try to clean build folder (delete it) and rebuild all.

can a default gui project run so we know VS is setup to link to Qt etc ?

I would imagine we got more errors if no QtDLL was found.

JohnSRV

@mrjj Hey thanks.

Qt is already linked to VS and i already can run some other prjects
the problem seems to only arise with this class

Bonnie

The definitions should be in the auto generated moc_Client.cpp which is also linked automatically.
So I agree with clean and rebuild if other projects's mocing has no problem.