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//MyDlg.h#ifndef MYDLG_H#define MYDLG_H#include <QDialog>class QLabel;class QLineEdit;class QComboBox;class QProgressBar;class QPushButton;class QGridLayout;class MyDlg : public QDialog{  Q_OBJECTpublic:  MyDlg(QWidget *parent = 0);private slots:  void startProgress();private:  QLabel *fileNum;  QLineEdit *fileNumLineEdit;  QLabel *progressType;  QComboBox *comboBox;  QProgressBar *progressBar;  QPushButton *startBtn;  QGridLayout *mainLayout;};#endif // MYDLG_H

//MyDlg.cpp#include <QDialog>#include <QLabel>#include <QLineEdit>#include <QComboBox>#include <QPushButton>#include <QProgressBar>#include <QProgressDialog>#include <QWidget>#include <QGridLayout>#include 'MyDlg.h'MyDlg::MyDlg(QWidget *parent) : QDialog(parent){  setWindowTitle(tr('Progress'));  fileNum = new QLabel;  fileNum->setText(tr('文件數(shù)目：'));  fileNumLineEdit = new QLineEdit;  fileNumLineEdit->setText(tr('10000'));  progressType = new QLabel;  progressType->setText(tr('顯示類型'));  comboBox = new QComboBox;  comboBox->addItem(tr('progressBar'));  comboBox->addItem(tr('progressDialog'));  progressBar = new QProgressBar;  startBtn = new QPushButton;  startBtn->setText(tr('開始'));  mainLayout = new QGridLayout(this);  mainLayout->addWidget(fileNum, 0, 0, 1, 1);  mainLayout->addWidget(fileNumLineEdit, 0, 1, 1, 1);  mainLayout->addWidget(progressType, 1, 0, 1, 1);  mainLayout->addWidget(comboBox, 1, 1, 1 ,1);  mainLayout->addWidget(progressBar, 2, 1, 1, 2);  mainLayout->addWidget(startBtn, 3, 1, 1, 1);  mainLayout->setMargin(15);  mainLayout->setSpacing(10);  connect(startBtn, SIGNAL(clicked()), this, SLOT(startProgress()));}void MyDlg::startProgress(){  bool ok;  int num = fileNumLineEdit->text().toInt(&ok);  if(!ok)  {      return ;  }  if(comboBox->currentIndex() == 0)  {      progressBar->setRange(0, num);      for(int i = 1; i <= num; i++)      {          progressBar->setValue(i);      }  }  else  {      QProgressDialog *progressDlg=new QProgressDialog(this);      QFont font('ZYSong18030',12);      progressDlg->setFont(font);      progressDlg->setWindowModality(Qt::WindowModal);      progressDlg->setMinimumDuration(5);      progressDlg->setWindowTitle(tr('please wait'));      progressDlg->setLabelText(tr('正在復制......     '));      progressDlg->setCancelButtonText(tr('取消'));      progressDlg->setRange(0,num);      for(int i = 1; i <= num; i++)      {          progressDlg->setValue(i);          if(progressDlg->wasCanceled())          {              return ;          }      }  }}

//main.cpp#include <QApplication>#include <QTextCodec>#include 'MyDlg.h'int main(int argc, char *argv[]){  QTextCodec::setCodecForTr(QTextCodec::codecForLocale());  QApplication app(argc, argv);  MyDlg md;  md.show();  return app.exec();}

程序運行截圖：