程序运行，但没有显示Qt c ++

没有错误，但屏幕上没有显示任何内容，弹出一个窗口，该窗口使用 QProcess 运行另一个程序，该程序运行良好。 代码如下：

头文件：

#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
#include <QtGui>
#include <QTimer>
namespace Ui {
    class Widget;
}
class Widget : public QWidget
{
    Q_OBJECT
public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();
private slots:
    void setTimer();
    void displayAdvice();
    void cancelTimer();
    void addAdvice();
    void processDone(int);
private:
    QLabel* timerLbl;
    QLineEdit* timerEdt;
    QTextEdit* adviceEdt;
    QPushButton* okBtn;
    QPushButton* cancelBtn;
    QTimer* timer;
    QProcess *process;
    void setupGui();

private:
    Ui::Widget *ui;
};
#endif // WIDGET_H

小部件.cpp

#include "widget.h"
#include "ui_widget.h"
Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    setupGui();
}
Widget::~Widget()
{
    delete ui;
}
void Widget::setupGui()
{
    timerLbl = new QLabel("Timer set interval in seconds");
    timerEdt = new QLineEdit();
    adviceEdt = new QTextEdit();
    this->adviceEdt->setReadOnly(true);
    okBtn = new QPushButton("OK");
    cancelBtn = new QPushButton("Cancel");
    QVBoxLayout* layout = new QVBoxLayout();
    layout->addWidget(timerLbl);
    layout->addWidget(timerEdt);
    layout->addWidget(okBtn);
    layout->addWidget(adviceEdt);
    layout->addWidget(cancelBtn);
    this->setWindowTitle("Advice");
    this->setLayout(layout);
    connect(okBtn,SIGNAL(clicked()), this, SLOT(setTimer()));
    connect(cancelBtn, SIGNAL(clicked()), this, SLOT(cancelTimer()));
    connect(timer, SIGNAL(timeout()),this, SLOT(displayAdvice()));
}
void Widget::setTimer()
{
    timer = new QTimer(this);
    connect(timer, SIGNAL(timeout()),this, SLOT(cancelTimer()));
    QString setting = this->timerEdt->text();
    bool ok;
    int set = setting.toInt(&ok,10);
    set = set * 1000;
    timer->setInterval(set);
    timer->start();
    timerEdt->setReadOnly(true);
    okBtn->setDown(true);
}
void Widget::cancelTimer()
{
    timer->stop();
    adviceEdt->clear();
    okBtn->setDown(false);
    timerEdt->clear();
    timerEdt->setReadOnly(false);
}
void Widget::displayAdvice()
{
    process = new QProcess(this);
    process->start("C:/Users/Dmon/Desktop/47039949 COS3711 Assignment 2/Question 4/Ass2Q4Part1-build-desktop/debug/Ass2Q4Part1.exe");
    connect(process, SIGNAL(readyReadStandardOutput()),this, SLOT(addAdvice()));
    connect(process, SIGNAL(finished(int)),this, SLOT(processDone(int)));
}
void Widget::addAdvice()
{
    QByteArray data = process->readAllStandardOutput();
    QString strToWrite = data;
    this->adviceEdt->clear();
    this->adviceEdt->append(strToWrite);
}
void Widget::processDone(int)
{
    process->close();
    process->deleteLater();
    process=0;
}

主.cpp

#include <QtGui/QApplication>
#include "widget.h"
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();
    return a.exec();
}

程序运行时未显示任何内容，然后在大约 15 秒后最终退出且没有错误。