QT启动主界面窗口之前先启动一个子窗口-调用子窗口的方法

 QT启动主界面窗口之前先启动一个子窗口，通过子窗口选择是否进入主界面，以及重新登录的操作，调用子窗口的方法

void src3_4Widget::on_pushButton_re_login_clicked()
{
    close();
    MyDialog2 dlg2;
    if(dlg2.exec()==QDialog::Accepted)
    {
        show();
    }

}

主窗口cpp 

#include "src3_4widget.h"
#include "ui_src3_4widget.h"
#include 
#include "mydialog2.h"

src3_4Widget::src3_4Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::src3_4Widget)
{
    ui->setupUi(this);
    ui->label_show_info->resize(200,50);
    ui->label_show_info->setText(tr("我是主界面哦"));
    //信号与槽的关联
    connect(ui->pushButton_show_child_window,&QPushButton::clicked,this,&src3_4Widget::showChildDialog);
}

src3_4Widget::~src3_4Widget()
{
    delete ui;
}

void src3_4Widget::showChildDialog()
{
    QDialog *dialog = new QDialog(this);
    QLabel * label2 = new QLabel(dialog);
    label2->resize(500,50);
    label2->setText(tr("我是子窗口的内容"));
    dialog->show();

}


void src3_4Widget::on_pushButton_re_login_clicked()
{
    close();
    MyDialog2 dlg2;
    if(dlg2.exec()==QDialog::Accepted)
    {
        show();
    }

}

void src3_4Widget::on_pushButton_main_exit_clicked()
{

}

子窗口：

#include "mydialog2.h"
#include "ui_mydialog2.h"

MyDialog2::MyDialog2(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::MyDialog2)
{
    ui->setupUi(this);
}

MyDialog2::~MyDialog2()
{
    delete ui;
}

void MyDialog2::on_pushButton_login_clicked()
{
    accept();
}

main.cpp

#include "src3_4widget.h"

#include 
#include "mydialog2.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MyDialog2 dialog2;
    if(dialog2.exec()==QDialog::Accepted)
    {
        src3_4Widget w;
        w.show();
        return a.exec();
    }
    else
    {
        return 0;
    }

}

QT启动主界面窗口之前先启动一个子窗口.rar-QT文档类资源-CSDN下载https://txwtech.blog.csdn.net/article/details/1264更多下载资源、学习资料请访问CSDN下载频道.https://download.csdn.net/download/txwtech/86405721