.ui.h / kdevelop question

eantoranz · 01-13-2006, 10:00 AM

The form I'm using was already transformed using designer (qt4) and I dropped the qt3 version from the project. The other code I had already made for the project, I'll include it (or should I say twist it) it once I get the naked frame up and running correctly. And thanks for that information. I had alredy read about it on the QT4 help pages.

eantoranz · 01-13-2006, 01:04 PM

I was able to make it uic the form.

The problem is that I thought it was going to compile formas/principal/formabase_qt4.ui into formas/principal/ui_formabase_qt4.h, and that was my include in main.cpp, but it uics it into ui_formabase_qt4.h (in that same directory of main.cpp). I had to change the include in main.cpp, and then it worked.

Now are there any advices to make the application finish once I close the main frame?

eantoranz · 01-16-2006, 12:58 PM

OK... I finally made the form show up.

I noticed there was a mistake (i think) in the tutorial that I corrected. The binary ran anyway, but the form showed up with no content. After a while looking at the code, I noticed that the extended class was calling setupUi(this) instead of setupUi(parent). I made the correction and then the frame showed up!

What I'm missing now is the auto-connection. I have two buttons in my form: btnBuscar and btnDetener.

On the extended .h I have:

Code:

#include "ui_principalbase.h"

class Principal: public QDialog, private Ui::PrincipalBase {
        Q_OBJECT

public:
        Principal(QDialog *parent = 0);

private slots:
        void on_btnBuscar_clicked();
        void on_btnDetener_clicked();
};

See I have the two slots.

On the .cpp:

Code:

#include "principal.h"

Principal::Principal(QDialog * parent) : QDialog(parent) {
        setupUi(parent);
}

void Principal::on_btnBuscar_clicked() {
        qWarning("btnBuscar clicked");
}

void Principal::on_btnDetener_clicked() {
        qWarning("btnDetener clicked");
}

See? Very simple and straight forward. Yet when I click on btnBuscar, there's no warning showing up in the console. :'( Is there something I have to do on the .pro file?

And I still have the problem that the application is not finishing after I close the form (the only form).

Mara · 01-16-2006, 03:54 PM

You need to connect the button signal clicked() with your slot.

Code:

connect(btnBuscar, SIGNAL(clicked()), this, SLOT(on_btnBuscar_clicked());

Should be something like that, for each button.

eantoranz · 01-16-2006, 04:47 PM

Oh, I did that in order to move on... but according to QT4 documentation uic (somehow) can do that work for me automagically. Look QT's autoconnection feature in the QT4 documentation.

Mara · 01-16-2006, 04:57 PM

Interesting, I haven't seen it. Thanks (it can lead to big mess, through).

eantoranz · 01-16-2006, 05:06 PM

At last something you didn't know! ;-)

eantoranz · 01-17-2006, 12:37 PM

This used to work on QT3:

Code:

qWarning("Dominio: " + dominio->text());

(dominio is a QLineEdit)

But now it doesn't work with QT4.
This is the message from make:

Code:

error: cannot cast ‘const QString’ to ‘const char*’ for argument ‘1’ for ‘void qWarning(const char*, ...)’

(or something like that, I had to translate it from spanish).

graemef · 01-17-2006, 12:42 PM

you need to convert the whole string to a c-style string. Use the toStdString() method of the QString class.

graemef · 01-17-2006, 01:07 PM

...Or you can use the new QMessageBox class

Code:

QMessageBox::information(this
                        ,"Application name here"
                        ,"Dominio: " + dominio->text());

graeme.

eantoranz · 01-17-2006, 01:33 PM

That would be ok, but I just want a message to show up in my console, not in a window. I made the change you suggested before, and now the compiler says it can't convert from std::string to char *. It's ok if I just comment those lines (by now)... they're just debugging messages, no big deal (again, by now)... but look at this next problem (and this has me

):

Code:

int i = 0;
while (query.next()) {
	records->setItem(i, 0, QTableWidgetItem(query.value(1).toString()));
	i++;
}

And the compiler says it can't find a matching function for QTableWidget::setItem(int&, int , QTableWidgetItem)... and please, notice the & of int&. Where does that come from? i is just an int, right?

graemef · 01-17-2006, 01:47 PM

It is expecting the TableWidgetItem to be passed as a pointer. Don't worry about the reference the compiler does that because you have passed a variable rather than a literal. So try:

Code:

records->setItem(i, 0, &(QTableWidgetItem(query.value(1).toString())));

and you should be okay.

(If you just want some diagnostics then you can use std::string and std::cout)

graeme.

eantoranz · 01-17-2006, 02:01 PM

It works with "new QTableWidgetItem()" too. Thanks!

Can you give me examples of the use of std::string and std::cout?

eantoranz · 01-17-2006, 02:06 PM

Oops! The linker is complaining a lot!

Code:

principal.o: in the function `Principal::btnBuscarClicked()':
principal.cpp:(.text+0x1d0): reference to `QSqlDatabase::QSqlDatabase()' undefined
principal.cpp:(.text+0x1fb): reference to `QSqlQuery::QSqlQuery(QString const&, QSqlDatabase)' undefined
principal.cpp:(.text+0x229): reference to `QSqlDatabase::~QSqlDatabase()' undefined
principal.cpp:(.text+0x28e): reference to `QSqlQuery::prepare(QString const&)' undefined
.
.
.

What did I do in my past life to deserve this punishment? :'( :-D

graemef · 01-17-2006, 02:14 PM

Looks as if the linker is not including the QT files. You may need to check your QMake. Sorry I've not actually got access to any of my make files to see what they look like for a comparison

graeme.