1、新建GUI应用，项目名称"Geometry"，基类选择"QDialog",类名为"Geometry",取消"创建界面"。

main.cpp不变：

#include "geometry.h"#include 
    
     int main(int argc, char *argv[]){    QApplication a(argc, argv);    Geometry w;    w.show();        return a.exec();}
    

2、Geometry类继承自QDialog类，在头文件中声明需要的控件[QLabel]以及所需要的函数

#ifndef GEOMETRY_H#define GEOMETRY_H#include 
    
     #include 
     
      #include 
      
       class Geometry : public QDialog{    Q_OBJECT    public:    Geometry(QWidget *parent = 0);    ~Geometry();    void updateLabel();private:    QLabel *xLabel;    QLabel *xValueLabel;    QLabel *yLabel;    QLabel *yValueLabel;    QLabel *FrmLabel;    QLabel *FrmValueLabel;    QLabel *posLabel;    QLabel *posValueLabel;    QLabel *geoLabel;    QLabel *geoValueLabel;    QLabel *widthLabel;    QLabel *widthValueLabel;    QLabel *heightLabel;    QLabel *heightValueLabel;    QLabel *rectLabel;    QLabel *rectValueLabel;    QLabel *sizeLabel;    QLabel *sizeValueLabel;    QGridLayout *mainLayout;protected:    void moveEvent(QMoveEvent *);    void resizeEvent(QResizeEvent *);};#endif // GEOMETRY_H
      
     
    

3、在构造函数中完成控件的创建以及初始化工作 4、updateLabel()函数完成获得各位置函数的信息并显示功能 5、重定义QWidget的moveEvent()函数，响应对话框的移动事件，使得窗体在被移动时能够同步更新个函数的显示结果。 6、重定义QWidget的resizeEvent()函数，响应对话框的大小调整事件，使得窗体大小改变时能够同步更新个函数的显示结果。

#include "geometry.h"Geometry::Geometry(QWidget *parent)    : QDialog(parent){    setWindowTitle(tr("Geometry"));    xLabel =new QLabel(tr("x():"));    xValueLabel =new QLabel;    yLabel =new QLabel(tr("y():"));    yValueLabel =new QLabel;    FrmLabel =new QLabel(tr("Frame:"));    FrmValueLabel =new QLabel;    posLabel =new QLabel(tr("pos():"));    posValueLabel =new QLabel;    geoLabel =new QLabel(tr("geometry():"));    geoValueLabel =new QLabel;    widthLabel =new QLabel(tr("width():"));    widthValueLabel =new QLabel;    heightLabel =new QLabel(tr("height():"));    heightValueLabel =new QLabel;    rectLabel =new QLabel(tr("rect():"));    rectValueLabel =new QLabel;    sizeLabel =new QLabel(tr("size():"));    sizeValueLabel =new QLabel;    mainLayout =new QGridLayout(this);    mainLayout->addWidget(xLabel,0,0);    mainLayout->addWidget(xValueLabel,0,1);    mainLayout->addWidget(yLabel,1,0);    mainLayout->addWidget(yValueLabel,1,1);    mainLayout->addWidget(posLabel,2,0);    mainLayout->addWidget(posValueLabel,2,1);    mainLayout->addWidget(FrmLabel,3,0);    mainLayout->addWidget(FrmValueLabel,3,1);    mainLayout->addWidget(geoLabel,4,0);    mainLayout->addWidget(geoValueLabel,4,1);    mainLayout->addWidget(widthLabel,5,0);    mainLayout->addWidget(widthValueLabel,5,1);    mainLayout->addWidget(heightLabel,6,0);    mainLayout->addWidget(heightValueLabel,6,1);    mainLayout->addWidget(rectLabel,7,0);    mainLayout->addWidget(rectValueLabel,7,1);    mainLayout->addWidget(sizeLabel,8,0);    mainLayout->addWidget(sizeValueLabel,8,1);    updateLabel();}Geometry::~Geometry(){    }void Geometry::updateLabel(){    QString xStr;                      	//获得x()函数的结果并显示    xValueLabel->setText(xStr.setNum(x()));    QString yStr;                      	//获得y()函数的结果并显示    yValueLabel->setText(yStr.setNum(y()));    QString frameStr;                 	//获得frameGeometry()函数的结果并显示    QString tempStr1,tempStr2,tempStr3,tempStr4;    frameStr = tempStr1.setNum(frameGeometry().x())+","+tempStr2.setNum(frameGeometry().y())+","+tempStr3.setNum(frameGeometry().width())+","+tempStr4.setNum(frameGeometry().height());    FrmValueLabel->setText(frameStr);    QString positionStr;            	//获得pos()函数的结果并显示    QString tempStr11,tempStr12;    positionStr =tempStr11.setNum(pos().x())+","+tempStr12.setNum(pos().y());    posValueLabel->setText(positionStr);    QString geoStr;               		//获得geometry()函数的结果并显示    QString tempStr21,tempStr22,tempStr23,tempStr24;    geoStr =tempStr21.setNum(geometry().x())+","+tempStr22.setNum(geometry().y())+","+tempStr23.setNum(geometry().width())+","+tempStr24.setNum(geometry().height());    geoValueLabel->setText(geoStr);    QString wStr,hStr;                  //获得width()、height()函数的结果并显示    widthValueLabel->setText(wStr.setNum(width()));    heightValueLabel->setText(hStr.setNum(height()));    QString rectStr;                    //获得rect()函数的结果并显示    QString tempStr31,tempStr32,tempStr33,tempStr34;    rectStr =tempStr31.setNum(rect().x())+","+tempStr32.setNum(rect().y())+","+tempStr33.setNum(/*rect().width()*/width())+","+tempStr34.setNum(height()/*rect().height()*/);    rectValueLabel->setText(rectStr);    QString sizeStr;                 	//获得size()函数的结果并显示    QString tempStr41,tempStr42;    sizeStr =tempStr41.setNum(size().width())+","+tempStr42.setNum(size().height());    sizeValueLabel->setText(sizeStr);}void Geometry:: moveEvent(QMoveEvent *){    updateLabel();}void Geometry::resizeEvent(QResizeEvent *){    updateLabel();}