我設計一個UI要測試一個QPushButton去改變QLabel的 顯示，但是編譯室沒問題的
都會跑出這個字眼
The program has unexpectedly finished.
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include "ui_mainwindow.h"
class QLabel;
class QPushButton;
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit
MainWindow(QWidget *parent = 0);
~MainWindow();
private:
Ui::MainWindow *ui;
QPushButton *PB;
QLabel *label;
private slots:
void ck_bt();
};
#endif // MAINWINDOW_H
----------------------------------------------------------------------------------------------------------------
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
connect(PB,SIGNAL(clicked()),this,SLOT(ck_bt()));
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::ck_bt()
{
label->setText("1234");
}
-----------------------------------------------------------
#include <QtGui/QApplication>
#include "mainwindow.h"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
