QT编程的QDialog对话框右上角的问号按钮如何取消呢？
很简单，Qt::WindowFlags flags=Qt::Dialog;flags |=Qt::WindowCloseButtonHint;setWindowFlags(flags);
Qt 对话框按钮设置与取消：
程序中已给出解释：首先：.h 文件，#ifndef MESSAGEBOX_H，#define MESSAGEBOX_H，#include <QDialog>class QLabel ;class MessageBox : public QDialog。
{Q_OBJECT，public :MessageBox (QWidget *parent =0);public slots :void slotQuestion ();void slotInformation ();void slotWarning ();void slotCritical ();void slotAbout ();void slotAboutQt ();void slotCustom ();private :QLabel *label ;};#endif // MESSAGEBOX_H
其次：.cpp 文件#include "messagebox.h"#include <QtGui>MessageBox ::MessageBox (QWidget *parent ): QDialog (parent ) setWindowTitle (trUtf8("\345\257\271\350\257\235\346\241\206\345\255\246\344\271\240\347\244\272\344\276\213"));label = new QLabel ;
case QMessageBox ::Cancel :label ->setText (" Warning button / Cancel ");break;default :break ;}return ;}void MessageBox ::slotQuestion (){}void MessageBox ::slotInformation (){}void MessageBox ::slotCritical (){ }void MessageBox ::slotAbout (){}void MessageBox ::slotAboutQt ()，后面的函数代码可以参照前面的，在此就不介绍。
