Showing form - help

[waynew]

I hate to ask for help on something this simple, but I'm trying to learn C++ and Qt at the same time - can't find an answer in any of my books or online, so...

I have a dialog (stninfodialog) that works fine when called from a menu pick on the main window.
Now I need to call that dialog from a function in a different class.
Simple in Java, but... I can't see how to do it in Qt/C++.

Here is the relevant code from the main window cpp:

#include <QtGui>
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "makestndb.h"
 
MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent), ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    setupActions();
    mStatLabel = new QLabel;
    statusBar()->addPermanentWidget(mStatLabel);
    connect(ui->call, SIGNAL(textChanged()), this, SLOT(updateStats()));
    StnInfoD = new StnInfoDialog;
    bool chkStnInfo = makeStnDB();
}
 
void MainWindow::setupActions()
{
  connect(ui->actionStn_Info, SIGNAL(triggered(bool)),
          this, SLOT(stnInfo()));
}
 
void MainWindow::stnInfo()
{
    StnInfoD->show();
}

#include <QtGui>
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "makestndb.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent), ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    setupActions();
    mStatLabel = new QLabel;
    statusBar()->addPermanentWidget(mStatLabel);
    connect(ui->call, SIGNAL(textChanged()), this, SLOT(updateStats()));
    StnInfoD = new StnInfoDialog;
    bool chkStnInfo = makeStnDB();
}

void MainWindow::setupActions()
{
  connect(ui->actionStn_Info, SIGNAL(triggered(bool)),
          this, SLOT(stnInfo()));
}

void MainWindow::stnInfo()
{
    StnInfoD->show();
}

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So, now the other class/function (makestndb.h/makestndb.cpp):

makestndb.h

#ifndef MAKESTNDB_H
#define MAKESTNDB_H
 
#include "stninfodialog.h"
 
class makeStnDB {
   private:
       StnInfoDialog *StnInfoD;
 
};
 
bool makeStnDB();
 
#endif // MAKESTNDB_H

#ifndef MAKESTNDB_H
#define MAKESTNDB_H

#include "stninfodialog.h"

class makeStnDB {
   private:
       StnInfoDialog *StnInfoD;

};

bool makeStnDB();

#endif // MAKESTNDB_H

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makestndb.cpp

#include "makeStnDB.h"
#include <iostream>
#include <QString>
#include <QtSql>
#include "stninfodialog.h"
 
bool makeStnDB() {
   QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
   db.setDatabaseName("StnInfo");
   db.open();
 
   //Check to see if stninfo exists...
   QSqlQuery query = QSqlQuery::QSqlQuery("StnInfo");
   query.exec("SELECT call FROM stnInfo");
 
   if (query.isNull(1)) {
      query.exec("CREATE table stnInfo (id int recNum primary key, call varchar(8), "
                  "name varchar(80), address1 varchar(80), accress2 varchar(80), "
                  "city varchar(80), state varchar(80), state varchar(40), postalCode varchar(20), "
                  "country varchar(40), grid varchar(8), cqZone varchar(8), ituZone varchar(8), "
                  "latitude varchar(8), longitude varchar(8), licenseClass varchar(12)");
 
     //HOW DO I CALL THE STNINFODIALOG FROM HERE?
 
   }
   if (!db.open()) {
      return false;
   }
   return true;
}

#include "makeStnDB.h"
#include <iostream>
#include <QString>
#include <QtSql>
#include "stninfodialog.h"

bool makeStnDB() {
   QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
   db.setDatabaseName("StnInfo");
   db.open();

   //Check to see if stninfo exists...
   QSqlQuery query = QSqlQuery::QSqlQuery("StnInfo");
   query.exec("SELECT call FROM stnInfo");

   if (query.isNull(1)) {
      query.exec("CREATE table stnInfo (id int recNum primary key, call varchar(8), "
                  "name varchar(80), address1 varchar(80), accress2 varchar(80), "
                  "city varchar(80), state varchar(80), state varchar(40), postalCode varchar(20), "
                  "country varchar(40), grid varchar(8), cqZone varchar(8), ituZone varchar(8), "
                  "latitude varchar(8), longitude varchar(8), licenseClass varchar(12)");

     //HOW DO I CALL THE STNINFODIALOG FROM HERE?

   }
   if (!db.open()) {
      return false;
   }
   return true;
}

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Thanks for any advice!

[wysota]

Does it even compile?

Anyway, in C++ you can do it the same as in Java. The concept will be the same although the implementation of the concept will differ a bit.

[jano_alex_es]

Now I need to call that dialog from a function in a different class.

Few ways... I use to create classes which inherits from QDialog and I include its header file wherever I want to create a dialog. Actually, in my opinion this is the cleaner way.

But you can implement a public function which will give a pointer to the already created (or NULL if not) QDialog.

[waynew]

Thanks guys, I got it working. Lots to learn.