求助！！！Qt界面相互通信

[weixin_38092995]

做了两个界面，主界面为spray，子界面为setdialog，想实现如下功能，在子界面的输入框里输入一个参数，然后在主界面显示，下面是主要的代码，各位大侠看看错误在哪子程序相关函数SetDialog::SetDialog(QWidget *parent) :…………connect(ui->pushButton,SIGNAL(clicked()),this,SLOT(twotest1()));……void SetDialog::twotest1(){    emit t();    this->hide();}主程序相关函数Spray::Spray(QWidget *parent) :……connect(ui->setpushButton,SIGNAL(clicked()),this,SLOT(test1()));connect(&setdialog,SIGNAL(t()),this,SLOT(test3()));……void Spray::test1(){    setdialog.show();    this->hide();}void Spray::test3(){    this->show();    value = &setdialog->lineEdit->text();    }Value是主程序里面的值