常见的几个Qt程问题的处理.docx

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 void MainWindow::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 ? ? ? ? ? ? ? QString fileName = QFileDialog::getOpenFileName(this);? ? ? ? ? ? ? if (!fileName.isEmpty())? ? ? ? ? ? ? {? ? ? ? ? ? ? ? ? ?? loadFile(fileName);? ? ? ? ? ? ? } 引用 ? ? ?? QString fileName = QFileDialog::getSaveFileName(this);? ? ?? if (fileName.isEmpty())? ? ?? {? ? ? ? ? ? ? return false;? ? ?? }３、如果创建Actions(可在菜单和工具栏里使用这些Action)答： 引用 newAct = new QAction(QIcon(:/imagess/new.png), tr(New), this);? ? ? ? newAct-setShortcut(tr(Ctrl+N));? ? ? ? newAct-setStatusTip(tr(Create a new file));? ? ? ? connect(newAct, SIGNAL(triggered()), this, SLOT(newFile()));? ? ? ? openAct = new QAction(QIcon(:/imagess/open.png), tr(Open...), this);? ? ? ? openAct-setShortcut(tr(Ctrl+O));? ? ? ? openAct-setStatusTip(tr(Open an existing file));? ? ? ? connect(openAct, SIGNAL(triggered()), this, SLOT(open()));? ? ? ? saveAct = new QAction(QIcon(:/imagess/save.png), tr(Save), this);? ? ? ? saveAct-setShortcut(tr(Ctrl+S));? ? ? ? saveAct-setStatusTip(tr(Save the document to disk));? ? ? ? connect(saveAct, SIGNAL(triggered()), this, SLOT(save()));? ? ? ? saveAsAct = new QAction(tr(Save As...), this);? ? ? ? saveAsAct-setStatusTip(tr(Save the document under a new name));? ? ? ? connect(saveAsAct, SIGNAL(triggered()), this, SLOT(saveAs()));? ? ? ? exitAct = new QAction(tr(Exit), this);? ? ? ? exitAct-setShortcut(tr(Ctrl+Q));? ? ? ? exitAct-setStatusTip(tr(Exit the application));? ? ? ? connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));? ? ? ? cutAct = new QAction(QIcon(:/imagess/cut.png), tr(Cut), this);? ? ? ? cutAct-setShortcut(tr(Ctrl+X));? ? ? ? cutAct-setStatusTip(tr(Cut the current selections contents to the ? ? ? ? ? ? ?