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我在Qt的創造了一個非常簡單的GUI項目如下:拒絕信號似乎只發射一次
主:
#include <QApplication>
#include "dialog.h"
int main(int c, char* v[])
{
QApplication app(c,v);
Dialog* d = new Dialog;
d->show();
app.exec();
}
dialog.h:
#ifndef DIALOG_H
#define DIALOG_H
#include <QDialog>
#include "ui_dialog.h"
#include "progress_dialog.h"
class Dialog : public QDialog, private Ui::Dialog
{
Q_OBJECT
public:
explicit Dialog(QWidget *parent = 0);
~Dialog();
private:
progress_dialog* progress_dialog_;
public slots:
void create_and_show_progress_dialog();
void delete_progress_dialog();
};
#endif // DIALOG_H
對話框。 cpp:
#include "dialog.h"
#include "ui_dialog.h"
#include <QMessageBox>
Dialog::Dialog(QWidget *parent) :
QDialog(parent),progress_dialog_(new progress_dialog)
{
setupUi(this);
connect(pushButton,SIGNAL(clicked()),this,SLOT(create_and_show_progress_dialog()));
connect(progress_dialog_,SIGNAL(rejected()),this,SLOT(delete_progress_dialog()));
}
void Dialog::create_and_show_progress_dialog()
{
if (!progress_dialog_)
progress_dialog_ = new progress_dialog;
progress_dialog_->exec();
}
void Dialog::delete_progress_dialog()
{
delete progress_dialog_;
progress_dialog_ = nullptr;
QMessageBox::information(this,"Progress destroyed","I've just destroyed progress");
}
Dialog::~Dialog()
{
}
progress_di考勤記錄:
#ifndef PROGRESS_DIALOG_H
#define PROGRESS_DIALOG_H
#include "ui_progress_dialog.h"
class progress_dialog : public QDialog, private Ui::progress_dialog
{
Q_OBJECT
public:
explicit progress_dialog(QWidget *parent = 0);
public slots:
void exec_me();
};
#endif // PROGRESS_DIALOG_H
progress_dialog.cpp:
#include "progress_dialog.h"
progress_dialog::progress_dialog(QWidget *parent) :
QDialog(parent)
{
setupUi(this);
}
所以問題是,運行這個程序,並在主對話框中按下push_button後,正在顯示progress_dialog。在連接到拒絕槽的progress_dialog上單擊push_buttong後,此對話框正在關閉並顯示消息:QMessageBox :: information(this,「Progress destroyed」,「我剛剛銷燬了進度」);
但是,當我第二次(按主對話框上的按鈕,然後關閉progress_dialog)沒有消息正在顯示。試圖調試這和上設置斷點:
void Dialog::delete_progress_dialog()
{
delete progress_dialog_;//HERE BREAKPOINT WAS PLACED
progress_dialog_ = nullptr;
QMessageBox::information(this,"Progress destroyed","I've just destroyed progress");
}
但這個斷點被擊中只是第一次,之後進行這個斷點沒有命中。
發生了什麼事?
墊感謝很多! – smallB 2012-03-27 17:01:33