Get Progress Using COPYFILEEXW in Qt

#include  <QApplication> #include  <QFileDialog> #include  <QLineEdit> #include  <QPushButton> #include  <QLabel> #include  <QGridLayout> #include  < qthread> #include  <QPointer> #include  <QStateMachine> #include  <windows.h> Static qstring getlasterrormsg ()  {    LPWSTR bufPtr = NULL;     dword err = getlasterror ();     formatmessagew ( format_message_allocate_buffer |                    FORMAT_MESSAGE_FROM_SYSTEM |                    format_message_ignore_ inserts,                    null, err, 0,  (LPWSTR) &bufptr, 0, null);    const qstring result =          (BufPtr)  ? qstring::fromutf16 ((const ushort*) bufptr). Trimmed ()  :                    qstring ("unknown error %1"). Arg (err);     localfree ( BUFPTR);     return result;} Class copierworker : public qthread { // only to be used  by the copier object   bool m_stop;   qstring m_ Src, m_dst;   qpointer<qobject> m_object;   static dword  callback copyprogress (         LARGE_INTEGER  Totalsize, large_integer totaltransferred,         large_integer streamsize, large_integer streamtransferred,    &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;DWORD&NBSP;STREAMNO,&NBSP;DWORD&NBSP;CALLBACKREASON,&NBSP;HANDLE&NBSP;SRC,  handle dst,         lpvoid data)     {      q_unused (streamsize)  q_unused (streamTransferred)        q_unused (Streamno)  q_unused (Callbackreason)       q_ UNUSED (SRC)  q_unused (DST)       QObject * object =  static_cast<qobject*> (data);       const qstring text =  qstring ("Transferred %1 of %2 bytes") .             arg (Totaltransferred.quadpart). Arg (Totalsize.quadpart);       qmetaobject::invokemethOD (object,  "NewStatus", qt::queuedconnection,                                  q_arg (qstring, text));      return  Progress_continue;   }   void run ()  {      &NBSP;M_STOP&NBSP;=&NBSP;FALSE;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;BOOL&NBSP;RC&NBSP;=&NBSP;COPYFILEEXW (( LPCWSTR) M_src.utf16 (),  (LPCWSTR) m_dst.utf16 (),                              &copyprogress, m_object, &m_stop, 0);      if  (!RC)  {         qmetaobject::invokemethod (m_object,  " NewStatus ",  qt::queuedconnection,                                    q_ ARG (Qstring, getlasterrormsg ()));      }   }    copierworker (const qstring & src, const qstring & dst,  qobject * obj)  :      m_src (SRC),  m_dst (DST),  m_object ( obj)  {}   void stop ()  { m_stop = TRUE; }    friend class copier;}; Class copier : public qobject {   q_object   qpointer <copierworker> m_worker;public:   copier (CONST&NBSP;QSTRING&NBSP;&AMP;&NBSP;SRC, &NBSP;CONST&NBSP;QSTRING&NBSP;&AMP;&NBSP;DST)  : m_worker (New copierworker (SRC,&NBSP;DST,&NBSp;this)  {      connect (M_worker, signal (finished ()),  SIGNAL ( Finished ());       connect (M_worker, signal (finished ()),  m_worker,  slot (Deletelater ()));    }   ~copier ()  {       if  (!m_worker)  return;      m_worker->stop ();       if  (!m_worker->isrunning ())  delete m_worker;   }    q_signal void newstatus (const qstring &);    Q_SIGNAL  void finished ();    q_slot void stop ()  { m_worker->stop ();  }   void copy ()  { m_worker->start ();  }};class widget :  public QWidget {   Q_OBJECT   QLabel * m_status;    qlineedit *  M_src, * m_dst;   q_signal void stopcopy ();   Q_SLOT  Void startcopy ()  {      copier * copier = new  copier (M_src->text (),  m_dst->text ());       connect (Copier,  signal (NewStatus (QString)),  m_status, slot (SetText (QString)));       connect (Copier, signal (finished ()),  signal (copyfinished ()));       connect (This, signal (Stopcopy ()),  copier, slot (Stop ()));       copier->copy ();    }   q_signal void copyfinished ();p ublic:    widget (qwidget * parent = 0)  : qwidget (parent)  {       qgridlayout * layout = new qgridlayout (This);       m_src = new qlineedit;      m_dst = new qlineedit;       qpushbutton * srcbutton = new qpushbutton ("...");       qpushbutton * dstbutton = new qpushbutton ("...");       qpushbutton * copy = new qpushbutton ("copy");       qpushbutton * cancel = new qpushbutton ("Cancel");       qfiledialog * getsrc = new qfiledialog (this,  " Source file ");      qfiledialog * getdst = new  Qfiledialog (this,  "Source file");      m_status = new  Qlabel;      layout->addwidget (New qlabel ("From:"),  0, 0,  1, 1, qt::alignright);       layout->addwidget (m_src, 0, 1, 1, 1);       layout->addwidget (srcbutton, 0, 2, 1, 1);       layout->addwidget (New qlabel ("To:"), &NBSP;1,&NBSP;0,&NBSP;1,&NBSP;1,&NBSP;QT:: AlignRight);       layout->addwidget (m_dst, 1, 1, 1, 1);       layout->addwidget (dstbutton, 1, 2, 1, 1);       layout->addwidget (m_status, 2, 0, 1, 3);       layout->addwidget (Copy, 3, 0, 1, 3, qt::aligncenter);       layout->addwidget (CANCEL,&NBSP;4,&NBSP;0,&NBSP;1,&NBSP;3,&NBSP;QT:: AlignCenter);       getsrc->setfilemode (Qfiledialog::existingfile);       getdst-> Setacceptmode (Qfiledialog::acceptsave);       connect (SrcButton, SIGNAL ( Clicked ()),  getsrc, slot (Show ()));       connect (dstbutton, signal (Clicked ()),  getdst, slot (Show ()));       connect (Getsrc, signal ( Fileselected (QString)),  m_src, slot (SetText (QString)));       connect ( Getdst, signal (fileselected (QString)),  m_dst, slot (SetText (QString)));       qstatemachine * machine = new qstatemachine (This);       qstate * stopped = new qstate (Machine);       qstate * copying = new qstate (Machine);       machine->setinitialstate (Stopped);       stopped->addtransition (Copy,  signal (clicked ()),   copying);       stopped->assignproperty (copy,  "enabled",  true);       stopped->assignproperty (cancel,  "enabled",  false);       copying->addtransition (Cancel, signal (clicked ()),  stopped);       copying->addtransition (This, signal (copyfinished ()),  stopped);       connect (Copying, signal (entered ()),  slot (StartCopy ()));       connect (Copying, signal (exited ()),  signal (Stopcopy ()));       copying->assignproperty (copy,  "enabled",  false);       copying->assignproperty (cancel,  "enabled",  true);       Machine->start ();    }};int main (int argc, char *argv[]) {    qapplication a (argc, argv);    widget w;   w.show ();    return a.exec ();} #include   "Main.moc"

Get Progress Using COPYFILEEXW in Qt