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connect(slider, SIGNAL(valueChanged(int)), spinBox, SLOT(setValue(int)));

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
}

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

ui_mainwindow.h, denna är normalt sett gömd i projektet.

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    QObject::connect(ui->sliderA, SIGNAL(sliderMoved(int)), this, SLOT(kombineraLCD()));
    QObject::connect(ui->sliderB, SIGNAL(sliderMoved(int)), this, SLOT(kombineraLCD()));
}

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

MainWindow::kombineraLCD()
{
    int temp = ui->sliderA.value() - ui->sliderB.value();
    ui->LCD.value(temp);
}

/home/jens/avancerat/QT/MinTest02/mainwindow.cpp:-1: error: I konstruerare "MainWindow::MainWindow(QWidget*)":

/home/jens/avancerat/QT/MinTest02/mainwindow.cpp:-1: error: I global räckvidd:

Jaaaa

så ska du inte anropa LCD.value(temp) utan LCD.display(temp)..

(EDIT: jag hittade ju klassreferenserna på de sidor jag läste i t.ex QLCDNumber Class Reference )

Incidentally, QLCDNumber is the very oldest part of Qt, tracing its roots back to a BASIC program on the Sinclair Spectrum.

To automatically connect signals from the spin boxes defined in the user interface, we use the naming convention that indicates which widgets and their signals in the user interface should be connected to each slot. The first slot is called whenever the spin box called "inputSpinBox1" in the user interface emits the valueChanged() signal:

Kod: Markera allt

 void CalculatorForm::on_inputSpinBox1_valueChanged(int value)
 {
     ui.outputWidget->setText(QString::number(value + ui.inputSpinBox2->value()));
 }

void MainWindow::Calculate( void )
{
    int a = ui->SliderA->value();
    int b = ui->SliderB->value();
    ui->label_5->setText(QString::number(a * b));
    ui->lcd1->display(a - b);
}

kimmen skrev:Vad är en "global räckvidd" för något?

"global scope" kanske? Hur är kompilatorn "översatt" egentligen?

The quality of the project is very high and the choice of classes and methods is wide. The main problem is the documentation available only as Doxygen document. For an average programmer it is much more difficult to approach this library than the huge Qt itself.

Installing QextSerialPort

QextSerialPort is a third-party library for accessing the PC's serial port.
The normal procedure for installing this library is to download (use CVS to get the Qt4 version) and compile it (at a DOS prompt, type qmake and then make). This will compile the library and generate a dll.

The quick way to install the library is to download a precompiled version for Windows XP. This tutorial assumes you will extract this zip file on the C: drive, resulting in c:\qextserialport. For MSWindows to use a dll, it's directory must be in the PATH environment variable. Therefore, install the dll by copying c:\qextserialport\build\qextserialport.dll to C:\Windows.

// Talk to the robot over the serial link

#include <QApplication>
#include "MainWindow.h"
#include "SerialPort.h"

int main(int argc, char *argv[])
{
	QApplication app(argc, argv);
	SerialPort *sp=new SerialPort();
	MainWindow *win=new MainWindow(sp);
	win->show();
	return app.exec();
}

#include <qextserialbase.h>
#include <qextserialport.h>