Qt-interest Archive, December 2006
[Fwd: RE: Writing to a file]
Message 1 in thread
Wrong address, this one was meant to go here: qt-interest@xxxxxxxxxxxxx
Cheers, Oliver
p.s. I don't answer questions sent in private, sorry
-------- Original-Nachricht --------
Betreff: RE: Writing to a file
Datum: Thu, 28 Dec 2006 11:19:22 -0500
Von: Housman, Roger W. <housmanrw@xxxxxxxx>
An: Till Oliver Knoll <oliver.knoll@xxxxxxxxxxx>
Do you know how save the info from a QLineEdit? Sorry, I wasn't
specific with my question. I am fairly new to Qt and this is my first
try at writing to a file. I am trying to take the info entered into a
QLineEdit box and write it to a file. I can create and write to the
file, but it is writing the memory address from the QLineEdit instead of
the value store in it.
Here is my code for it:
//mapDialog.cpp
#include <QtGui>
#include "mapDialog.h"
QFile file("map.dat");
mapDialog::mapDialog(QWidget *parent)
: QDialog(parent)
{
setupUi(this);
connect(beginButton, SIGNAL(clicked()), this,
SLOT(beginButton_clicked()));
}
//save info to map.dat when clicked
void mapDialog::beginButton_clicked()
{
file.open(QIODevice::WriteOnly);
QTextStream out(&file);
out << numRooms;
}
//mapDialog.h
#ifndef MAPDIALOG_H
#define MAPDIALOG_H
#include <QDialog>
#include "ui_mapDialog.h"
class mapDialog : public QDialog, public Ui::mapForm
{
Q_OBJECT
public:
mapDialog(QWidget *parent = 0);
private slots:
void beginButton_clicked();
};
#endif
Thanks,
Roger
-----Original Message-----
From: Till Oliver Knoll [mailto:oliver.knoll@xxxxxxxxxxx]
Sent: Thursday, December 28, 2006 10:20 AM
To: Qt Interest List
Subject: Re: Writing to a file
Housman, Roger W. schrieb:
>
> I am trying to write the info stored in a variable to a file. How do
> I get Qt to write the value stored in the variable instead of the
> memory address of the variable to the file?
Does that work:
int value = 42;
QFile file ("c:\\temp\\test.txt");
if (file.open (QIODevice::WriteOnly | QIODevice::Text) == true) {
QTextStream out (&file);
out << "My value: " << value << "\n";
file.close();
}
Cheers, Oliver
--
[ signature omitted ]
Message 2 in thread
Till Oliver Knoll wrote:
> Wrong address, this one was meant to go here: qt-interest@xxxxxxxxxxxxx
>
> Cheers, Oliver
>
> p.s. I don't answer questions sent in private, sorry
>
> -------- Original-Nachricht --------
> Betreff: RE: Writing to a file
> Datum: Thu, 28 Dec 2006 11:19:22 -0500
> Von: Housman, Roger W. <housmanrw@xxxxxxxx>
> An: Till Oliver Knoll <oliver.knoll@xxxxxxxxxxx>
>
> Do you know how save the info from a QLineEdit? Sorry, I wasn't
> specific with my question. I am fairly new to Qt and this is my first
> try at writing to a file. I am trying to take the info entered into a
> QLineEdit box and write it to a file. I can create and write to the
> file, but it is writing the memory address from the QLineEdit instead of
> the value store in it.
>
> Here is my code for it:
>
> //mapDialog.cpp
>
> #include <QtGui>
>
> #include "mapDialog.h"
>
> QFile file("map.dat");
>
> mapDialog::mapDialog(QWidget *parent)
> : QDialog(parent)
> {
> setupUi(this);
>
> connect(beginButton, SIGNAL(clicked()), this,
> SLOT(beginButton_clicked()));
>
> }
>
>
> //save info to map.dat when clicked
> void mapDialog::beginButton_clicked()
> {
> file.open(QIODevice::WriteOnly);
>
> QTextStream out(&file);
> out << numRooms;
> }
>
> //mapDialog.h
>
> #ifndef MAPDIALOG_H
> #define MAPDIALOG_H
>
> #include <QDialog>
>
> #include "ui_mapDialog.h"
>
> class mapDialog : public QDialog, public Ui::mapForm
> {
> Q_OBJECT
>
> public:
> mapDialog(QWidget *parent = 0);
>
> private slots:
> void beginButton_clicked();
> };
>
> #endif
>
> Thanks,
> Roger
>
>
> -----Original Message-----
> From: Till Oliver Knoll [mailto:oliver.knoll@xxxxxxxxxxx]
> Sent: Thursday, December 28, 2006 10:20 AM
> To: Qt Interest List
> Subject: Re: Writing to a file
>
> Housman, Roger W. schrieb:
>> I am trying to write the info stored in a variable to a file. How do
>> I get Qt to write the value stored in the variable instead of the
>> memory address of the variable to the file?
>
> Does that work:
>
> int value = 42;
> QFile file ("c:\\temp\\test.txt");
>
> if (file.open (QIODevice::WriteOnly | QIODevice::Text) == true) {
> QTextStream out (&file);
> out << "My value: " << value << "\n";
> file.close();
> }
>
> Cheers, Oliver
>
> --
> To unsubscribe - send a mail to qt-interest-request@xxxxxxxxxxxxx with
> "unsubscribe" in the subject or the body.
> List archive and information: http://lists.trolltech.com/qt-interest/
>
>
>
intersting post
--
[ signature omitted ]
Message 3 in thread
> Do you know how save the info from a QLineEdit? Sorry, I wasn't
> specific with my question. I am fairly new to Qt and this is my first
> try at writing to a file. I am trying to take the info entered into a
> QLineEdit box and write it to a file. I can create and write to the
> file, but it is writing the memory address from the QLineEdit instead of
> the value store in it.
>
> Here is my code for it:
>
>
> //save info to map.dat when clicked
> void mapDialog::beginButton_clicked()
> {
> file.open(QIODevice::WriteOnly);
>
> QTextStream out(&file);
> out << numRooms;
> }
>
What is 'numRooms'? If it's a pointer to the QLineEdit widget itself, as
I suspect, then
that's exactly what you'd expect to happen.
You probably really meant
out << numRooms->text();
to write the actual text the lineedit contains - see the QLineEdit docs.
- Keith
--
[ signature omitted ]
