为什么我的简单Qt代码不起作用？

问题描述

好的，所以我想在Qt的主窗口中添加一个自定义类作为框架的子项：



customctrl.h ：

Okay, so I'm trying to simply add a custom class of mine as a child of a frame in my main window in Qt:

customctrl.h:

#ifndef CUSTOMCTRL_H
#define CUSTOMCTRL_H

#include <QWidget>

namespace Ui {
class customctrl;
}

class customctrl : public QWidget
{
    Q_OBJECT

public:
    explicit customctrl(QWidget *parent = 0);
    ~customctrl();

private:
    Ui::customctrl *ui;
};

#endif // CUSTOMCTRL_H

和我的主窗口：

and my main window:

#include "customctrl.h"

//A bunch of code...
{
    customctrl *cc = new customctrl();
    ui->frame->layout()->addWidget(cc);
}

然而，每次运行此代码时，我的程序崩溃，我不知道为什么。有什么我想念的吗？我究竟做错了什么？请帮我！谢谢!!!

And yet, every time I run this code, my program crashes and I don't know why. Is there something I'm missing? What am I doing wrong? Please help me! Thank you!!!

推荐答案

#include "customctrl.h"


customctrl::customctrl(QWidget *parent = 0) : QWidget(parent)
{
  resize(50, 50);
  setWindowTitle("Qt");
}


customctrl::~customctrl() {;}

======== =================================

=========================================

customctrl *cc = new customctrl(ui->frame);
cc->show();

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