我的程序出啥问题了？ [复制链接]

#include<QApplication>
#include<QLabel>
#include<QPushButton>
#include<QHBoxLayout>
#include<QSlider>


void setLabel(QLabel *label);

int main(int argc,char *argv[])
{

QApplication app(argc,argv);
QWidget *window=new QWidget;
window->setWindowTitle("WINDOWS窗口");//创建主窗体
QHBoxLayout *layout=new QHBoxLayout;
QLabel *label=new QLabel("<h2><i><font color=red>Hello</font></i></h2>");//子窗体
QPushButton *btn=new QPushButton("click me!");//子窗体
//QObject::connect(btn,SIGNAL(clicked()),&app,SLOT(quit()));
QObject::connect(btn,SIGNAL(clicked()),label,SLOT(setLabel(QLabel *)));
layout->addWidget(label);
layout->addWidget(btn);
window->setLayout(layout);
window->show();
return app.exec();
}
//我想实现点击按钮后，标签的字体变成 changed.可惜不行。。。我知道是局部变量的问题。请问有什么办法实现？
void setLabel(QLabel *label)
{
label->setText("changed");
label->setVisible(false);
}

QObject::connect(btn,SIGNAL(clicked()),label,SLOT(setText("change"));