realfan:QFrame *DeviceFrame = new QFrame(frame2);
这样写，DeviceFrame是局部变量
this->DeviceFrame->show();中的DeviceFrame是成员变量
(2015-11-10 12:31) 
非常感谢@论坛版主，我把我程序重新发一下。。。你看看
//构造函数里的代码
Widget::Widget(QWidget *parent) :
QWidget(parent),
ui(new Ui::Widget)
{
ui->setupUi(this);
QFrame *frame1 = new QFrame(this);
QFrame *frame2 = new QFrame(this);
QPushButton *button12 = new QPushButton("Bad Block",this);
QFrame *DeviceFrame = new QFrame(frame2);
DeviceFrame->setGeometry(160,0,550,452);
DeviceFrame->setStyleSheet("background-color:rgb(255, 255, 255);");
//DeviceFrame->setVisible(false);
//DeviceFrame->setHidden(true);
DeviceFrame->hide();
connect(button12,SIGNAL(clicked()),this,SLOT(DeviceFrame_show()));
}
//槽函数
void Widget::DeviceFrame_show()
{
//this->DeviceFrame->setVisible(true);
DeviceFrame->show();
}
//widget.h文件
namespace Ui {
class Widget;
}
class Widget : public QWidget
{
Q_OBJECT
public:
explicit Widget(QWidget *parent = 0);
~Widget();
QFrame *frame1;
QFrame *frame2;
QFrame *DeviceFrame;
QFrame *BadBlockFrame;
QFrame *DetailInfoFrame;
QFrame *FlashInfoFrame;
QFrame *EraseCountFrame;
QFrame *SMARTFrame;
QPushButton *button11;
QPushButton *button12;
QPushButton *button13;
QPushButton *button14;
QPushButton *button15;
QPushButton *button16;
public slots:
void DeviceFrame_show();
}
