QT 中提供的标准对话框：
QColorDialog
QFileDialog
QFontDialog
QInputDialog
QMessageBox
QProgressDialog

1 颜色选择对话框使用:

void ShowColorSelectDialog(){QTextStream out(stdout);//颜色对话框:QColor color = QColorDialog::getColor(Qt::blue,this,"please select a color",QColorDialog::NoButtons);if(color.isValid()){out << "selected a color" << endl;}else{out << "did not selected color" << endl;}
}

2 文件对话框使用：

void ShowSelectFileDialog()
{QTextStream out(stdout);QString selectFile = QFileDialog::getOpenFileName(this,"Open file",R"(C:\Users\BZ\Desktop)","Images (*.png *.xpm *.jpg)",nullptr,QFileDialog::DontUseNativeDialog | QFileDialog::ReadOnly);if(selectFile.isEmpty()){out << "not select file" << endl;}else{out << "selected file is:" << selectFile << endl;}
}void ShowSaveFileDialog()
{QTextStream out(stdout);QString saveFilePath = QFileDialog::getSaveFileName(this,"save file",R"(C:\Users\BZ\Desktop)","Images (*.png *.xpm *.jpg)");if(saveFilePath.isEmpty()){out << "not set save file" << endl;}else{out << "save file path:" << saveFilePath << endl;qDebug() << "save file path:" << saveFilePath << endl;}
}void ShowSelectFileDialog2()
{QFileDialog dialog(this);dialog.setFileMode(QFileDialog::AnyFile);dialog.setNameFilter(tr("Images (*.png *.xpm *.jpg)"));//dialog.setViewMode(QFileDialog::List);dialog.setViewMode(QFileDialog::Detail);dialog.setOptions(QFileDialog::DontUseNativeDialog);dialog.setDirectory(R"(C:\Users\BZ\Desktop)");//dialog.setLabelText(QFileDialog::LookIn,"this is a test");dialog.setWindowTitle("this is a test");//dialog.setAcceptMode(QFileDialog::AcceptSave);dialog.setAcceptMode(QFileDialog::AcceptOpen);QStringList fileNames;if (dialog.exec())fileNames = dialog.selectedFiles();
}

3 字体选择对话框使用：

void ShowFontDialog()
{QTextStream out(stdout);bool ok = false;QFont selectedfont = QFontDialog::getFont(&ok,this);if(ok){out << "selected font name:" << selectedfont.family() << endl;}else{out << "dit not select font" << endl;}
}

4 输入对话框的使用（用于从用户哪里获取一个单一的输入值）：
这里提供了4 种方式：getText、getItem、getInt、getDouble.

void MainWindow::ShowInputDialog()
{QTextStream out(stdout);bool ok = false;//getText
//    QString text = QInputDialog::getText(this, tr("QInputDialog::getText()"),
//                                      tr("User name:"), QLineEdit::Normal,
//                                      QDir::home().dirName(), &ok);
//    if (ok && !text.isEmpty()){
//        out << "input text is:" << text << endl;
//    }else{
//        out << "not input" << endl;
//    }//getItem
//    QStringList list{"item1","item2","item3","item4","item5"};
//    QString selectedItem = QInputDialog::getItem(this,"getItem","item",list,0,false,&ok);
//    if(ok && !selectedItem.isEmpty()){
//        out << "selected item is:" << selectedItem << endl;
//    }else{
//       out << "not selected" << endl;
//    }//getInt
//    int i = QInputDialog::getInt(this, tr("QInputDialog::getInteger()"),
//                              tr("Percentage:"), 25, 0, 100, 1, &ok);
//    if (ok){
//        out << "select num is:" << i << endl;
//    }else
//    {
//        out << "not select num" << endl;
//    }//getDoubledouble d = QInputDialog::getDouble(this, tr("QInputDialog::getDouble()"),tr("Amount:"), 37.56, -10000, 10000, 2, &ok);if (ok){out << "set num is:" << d << endl;}else{out << "not set num" << endl;}
}

5 消息对话框使用：

void MainWindow::ShowMessageBox()
{QTextStream out(stdout);
//    //方式一
//    QMessageBox box(this);
//    QString str = QString::fromUtf16(u"这是一个测试");
//    QString str2 = QString::fromUtf8("这是一个测试");//    box.setText(str);
//    box.setInformativeText("hello world");
//    box.setStandardButtons(QMessageBox::Save | QMessageBox::Discard | QMessageBox::Cancel);
//    box.setDefaultButton(QMessageBox::Save);
//    box.exec();//方式二，使用静态函数。// information(), question(), warning(), and critical()int ret = QMessageBox::warning(this, tr("My Application"),tr("The document has been modified.\n""Do you want to save your changes?"),QMessageBox::Save | QMessageBox::Discard| QMessageBox::Cancel,QMessageBox::Save);out << "ret is:" << ret << endl;
}

6 进度条对话框使用：

void ShowProgressDialog()
{
//    QProgressDialog progress("Copying files...", "Abort Copy", 0, 100, this);
//        progress.setWindowModality(Qt::WindowModal);
//        progress.show();
//        for (int i = 0; i < 100; i++) {
//            progress.setValue(i);
//            Sleep(1000);
//            if (progress.wasCanceled())
//                break;
//            //... copy one file
//        }
//        progress.setValue(100);//另一种使用定时器去更改值。
}