常见的几个Qt编程问题的处理

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1、１、如果在窗体关闭前自行判断是否可关闭答：重新实现这个窗体的closeEvent()函数，加入判断操作引用voidMainWindow::closeEvent(QCloseEvent*event){    if(maybeSave())    {       writeSettings();       event->accept();    }      else      {       event->ignore();    }}２、如何用打开和保存文件对话答：使用QFileDialog引用       QStringfileName=QFileDialog

2、::getOpenFileName(this);       if(!fileName.isEmpty())       {           loadFile(fileName);       }引用    QStringfileName=QFileDialog::getSaveFileName(this);    if(fileName.isEmpty())    {       returnfalse;    }３、如果创建Actions(可在菜单和工具栏里使用这些Action)答：引用newAct=newQAction(QIcon(":/imagess/

3、new.png"),tr("&New"),this);    newAct->setShortcut(tr("Ctrl+N"));    newAct->setStatusTip(tr("Createanewfile"));    connect(newAct,SIGNAL(triggered()),this,SLOT(newFile()));    openAct=newQAction(QIcon(":/imagess/open.png"),tr("&Open..."),this);    openAct->setShortcut(tr("Ctrl+O")); 

4、   openAct->setStatusTip(tr("Openanexistingfile"));    connect(openAct,SIGNAL(triggered()),this,SLOT(open()));    saveAct=newQAction(QIcon(":/imagess/save.png"),tr("&Save"),this);    saveAct->setShortcut(tr("Ctrl+S"));    saveAct->setStatusTip(tr("Savethedocumenttodisk"));    connect(

5、saveAct,SIGNAL(triggered()),this,SLOT(save()));    saveAsAct=newQAction(tr("Save&As..."),this);    saveAsAct->setStatusTip(tr("Savethedocumentunderanewname"));    connect(saveAsAct,SIGNAL(triggered()),this,SLOT(saveAs()));    exitAct=newQAction(tr("E&xit"),this);    exitAct->setShortc

6、ut(tr("Ctrl+Q"));    exitAct->setStatusTip(tr("Exittheapplication"));    connect(exitAct,SIGNAL(triggered()),this,SLOT(close()));    cutAct=newQAction(QIcon(":/imagess/cut.png"),tr("Cu&t"),this);    cutAct->setShortcut(tr("Ctrl+X"));    cutAct->setStatusTip(tr("Cutthecurrentselection'

7、scontentstothe"                "clipboard"));    connect(cutAct,SIGNAL(triggered()),textEdit,SLOT(cut()));    copyAct=newQAction(QIcon(":/imagess/copy.png"),tr("&Copy"),this);    copyAct->setShortcut(tr("Ctrl+C"));    copyAct->setStatusTip(tr("Copythecurrentselection'scontentstothe"  

8、