error using a plugin

[franco.amato]

Hi to all,
I'm getting error with qt plugins and visual studio 2005.
This is the code:

#include "LayoutEditor.h"
#include "LoginDialog.h"
#include "OfficesDialog.h"
 
#include <QtCore/QtPlugin>
#include <QtGui/QtGui>
#include <QtGui/QApplication>
#include <QtGui/QCleanlooksStyle>
#include <QtSql/QSqlDatabase>
#include <QtSql/QSqlQuery>
#include <QtGui/QMessageBox> 
#include <QtCore/QSettings>
#include <QtCore/QFile>
#include "Common.h"
 
Q_IMPORT_PLUGIN(qjpeg)
Q_IMPORT_PLUGIN(qgif)
Q_IMPORT_PLUGIN(qmng)
Q_IMPORT_PLUGIN(qtiff)
Q_IMPORT_PLUGIN(qsqlodbc)
 
QTextStream g_log;
 
bool connectToDB()
{
    QSettings settings("EditorGrafico.remote.ini", QSettings::IniFormat);
    QSqlDatabase db = QSqlDatabase::addDatabase("QODBC");
    db.setHostName(settings.value("db_hostname").toString());
    db.setDatabaseName(settings.value("db_name").toString());
    db.setUserName(settings.value("db_username").toString());
    db.setPassword(settings.value("db_userpass").toString());
    return db.open();
}

#include "LayoutEditor.h"
#include "LoginDialog.h"
#include "OfficesDialog.h"

#include <QtCore/QtPlugin>
#include <QtGui/QtGui>
#include <QtGui/QApplication>
#include <QtGui/QCleanlooksStyle>
#include <QtSql/QSqlDatabase>
#include <QtSql/QSqlQuery>
#include <QtGui/QMessageBox> 
#include <QtCore/QSettings>
#include <QtCore/QFile>
#include "Common.h"

Q_IMPORT_PLUGIN(qjpeg)
Q_IMPORT_PLUGIN(qgif)
Q_IMPORT_PLUGIN(qmng)
Q_IMPORT_PLUGIN(qtiff)
Q_IMPORT_PLUGIN(qsqlodbc)

QTextStream g_log;

bool connectToDB()
{
    QSettings settings("EditorGrafico.remote.ini", QSettings::IniFormat);
    QSqlDatabase db = QSqlDatabase::addDatabase("QODBC");
    db.setHostName(settings.value("db_hostname").toString());
    db.setDatabaseName(settings.value("db_name").toString());
    db.setUserName(settings.value("db_username").toString());
    db.setPassword(settings.value("db_userpass").toString());
    return db.open();
}

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and this is the error I got:

Error 1 error LNK2019: sÃ*mbolo externo "class QObject * __cdecl qt_plugin_instance_qjpeg(void)" (?qt_plugin_instance_qjpeg@@YAPAVQObject@@XZ) sin resolver al que se hace referencia en la función "public: __thiscall StaticqjpegPluginInstance::StaticqjpegPluginInstan ce(void)" (??0StaticqjpegPluginInstance@@QAE@XZ) main.obj

I work with visual studio 2005 and Qt 4.6.3 without pro file.
I hope to get help.

Best Regards,
Franco