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嗨我是編程新手,我已經說過了解關於C++和qt的知識。我想創建一個簡單的程序,在這個程序中用戶給出了gui的輸入,然後這些輸入被髮送到一個函數(這是一個單獨的頭文件和cpp文件),該函數在該函數中進行評估並再次顯示在gui中。爲qt創建器中的函數添加單獨的文件
我有三個文件,即main.cpp中,(mainwindow.cpp & mainwindow.h),和(addition.cpp和addition.h)
我想,該值從mainwindow.ui讀取(從lineedit),然後將它們發送到函數addition.cpp並進行評估,然後發送回mainwindow.cpp或mainwindow.ui(lineedit),以便我可以訪問此結果。
這裏是代碼我試圖
請幫我在理解過程
//main.cpp
#include "mainwindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
//mainwindow.h.
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include "addition.h"
#include <QMainWindow>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
QObject *sumnum;
private:
Ui::MainWindow *ui;
float number1,number2;
public slots:
void results(float);
private slots:
void on_addnum_clicked();
};
#endif // MAINWINDOW_H
//mainwindow.cpp.
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
sumnum = new QObject(this);
connect(sumnum,SIGNAL(add(float)),this,SLOT(results(float)));
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::results(float answer)
{
ui->sum->setText(QString::number(answer));
}
void MainWindow::on_addnum_clicked()
{
addresult(ui->num1->text().toDouble(),ui->num2->text().toDouble());
}
//addition.h
#ifndef ADDITION_H
#define ADDITION_H
#include <QObject>
class addition : public QObject
{
Q_OBJECT
public:
explicit addition(QObject *parent = 0);
void run(float, float);
private:
float answer;
signals:
void add(float);
public slots:
};
#endif // ADDITION_H
//addition.cpp
#ifndef ADDITION_H
#define ADDITION_H
#include <QObject>
class addition : public QObject
{
Q_OBJECT
public:
explicit addition(QObject *parent = 0);
void run(float, float);
private:
float answer;
signals:
void add(float);
public slots:
};
#endif // ADDITION_H
嗨,你可以更正上面的代碼。這對我來說是新的 –
您需要創建一個類的對象,而不是ob QObject本身來將信號連接到您的插槽:用'sumnum = new addition(this)替換'sumnum = new QObject(this);''since你的'add'類定義了'add'信號。 – xander