[Qt-creator] Problems building with Qt Creator

[jaff at student.dei.uc.pt]

Hi all,

I'm doing a simple login dialog and since I tried to use QTcpSockets 
I've been having some problems building my project.
I receive these errors:

logindialog.obj:: error:  unresolved external symbol 
"__declspec(dllimport) public: virtual __thiscall 
QTcpSocket::~QTcpSocket(void)" (__imp_??1QTcpSocket@@UAE at XZ) referenced 
in function "public: virtual __thiscall 
LoginDialog::~LoginDialog(void)" (??1LoginDialog@@UAE at XZ)

logindialog.obj:: error:  unresolved external symbol 
"__declspec(dllimport) public: __thiscall QTcpSocket::QTcpSocket(class 
QObject *)" (__imp_??0QTcpSocket@@QAE at PAVQObject@@@Z) referenced in 
function "public: __thiscall LoginDialog::LoginDialog(class QWidget *)" 
(??0LoginDialog@@QAE at PAVQWidget@@@Z)

debug\Backoffice.exe:: error:  2 unresolved externals

I'm using Qt Creator in Windows XP 32 bits. From what I found online, 
similar problems were solved by reinstalling Qt, adding settings to the 
.obj file, disabling shadow building in the pro.user file... I tried 
the last two solutions, none worked. The best I got was no errors but 
the building stopped and consequently was not completed.

Anyone know how to solve this. If anyone knows, please sahre it with 
me, because my work is getting delayed :| I will include the project 
files as attachments, since it's only a login dialog and there's only a 
few lines of code on it.

Thanks in advance,
João

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#include "logindialog.h"
#include "ui_logindialog.h"

LoginDialog::LoginDialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::LoginDialog)
{
    ui->setupUi(this);
    ui->lineEdit_2->setEchoMode(QLineEdit::Password);
}

LoginDialog::~LoginDialog()
{
    delete ui;
}

void LoginDialog::clearButtonClickedHandler()
{
    ui->lineEdit->clear();
    ui->lineEdit_2->clear();
    ui->lineEdit_3->clear();
}

void LoginDialog::connectToServer()
{
//    QString server = ui->label_3->text();

//    if(server=="")
//        tcpSocket.connectToHost(QHostAddress::LocalHost, 6178);
//    else
//        tcpSocket.connectToHost(server, 6178);
}

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#ifndef LOGINDIALOG_H
#define LOGINDIALOG_H

#include <QDialog>
#include <QtNetwork/QTcpSocket>
#include <QtNetwork/QHostAddress>
#include <QString>

namespace Ui
{
    class LoginDialog;
}

class LoginDialog : public QDialog
{
    Q_OBJECT

    public:
        explicit LoginDialog(QWidget *parent = 0);
        ~LoginDialog();

    public slots:
        void clearButtonClickedHandler();
        void connectToServer();

    private:
        Ui::LoginDialog *ui;
        QTcpSocket tcpSocket;
};

#endif // LOGINDIALOG_H
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#include <QtGui/QApplication>
#include "logindialog.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    LoginDialog w;
    w.show();

    return a.exec();
}
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