Hi

In the below code when i tries to close the dialog ,through the button I used in Window class then application crashes, but if I close it through the close button that is on the upper left corner that is "X" then it wont crashes and works fine and also no memory leakage. For this I use QDialog.exec() , So that modality should also set and "X" should also be visible but, using this QDialog.exec() also "X" Should not be visible.

Qt Code: 
  1. [B][U]SelectFile.cpp[/U][/B]
  2.  
  3. void SelectFile::init()
  4. {
  5.  connect(btn_SelectFile,SIGNAL(clicked()),this,SLOT(chooseMovie()));
  6. }
  7.  
  8. void SelectFile::chooseMovie()
  9. {
  10.   QString TmpStr = QFileDialog::getOpenFileName(this);
  11.   EnterMovies();
  12.   if(movieWindow==NULL)
  13.   Window *movieWindow = new Window(0);
  14.  connect(this,SIGNAL(movieChosen(QString)),movieWindow,SLOT(OpenMovie(QString)));
  15.  emit movieChosen(TmpStr);
  16.  movieWindow->exec();	
  17.  ExitMovies();
  18. }
  19.  
  20.  
  21. [B][U]window.cpp[/U][/B]
  22.  
  23.  
  24. Window::Window(QWidget *parent)
  25.     : QDialog(parent)
  26. {
  27.     setupUi(this);
  28.     movieWidget = new MovieWidget(this);
  29.     connect(this, SIGNAL(movieChoose(QString)),movieWidget,SLOT(loadMovie (QString)));
  30.    connect(movieWidget, SIGNAL(optimalSizeChange()),this, SLOT(updateSizes()));
  31.    connect(movieWidget, SIGNAL(NoPreview()),this, SIGNAL(NoPreviewAvailable()));
  32.    connect(btn_close, SIGNAL(clicked()), this, SLOT(Close()));
  33.    layout()->addWidget(movieWidget);
  34. }
  35.  
  36. Window::~Window()
  37. {
  38.  
  39. }
  40.  
  41. void Window::Close()
  42. {
  43.    connect(this, SIGNAL(DisposeCurrentMovie()),movieWidget,SLOT(dispose()));
  44.     close();
  45. }
  46. void Window :: OpenMovie(QString bMovieName)
  47. {
  48. 	emit movieChoose(bMovieName);
  49. }
  50. void Window::updateSizes()
  51. {
  52.     adjustSize();
  53. }
  54.  
  55.  
  56. [B][U]moviewidget.cpp
  57. [/U][/B]
  58. #include "moviewidget.h"
  59. #include <QtGui/QLayout>
  60. #include <Carbon/Carbon.h>
  61. #include <QuickTime/QuickTime.h>
  62.  
  63. MovieWidget::MovieWidget(QWidget *parent)
  64.     : QWidget(parent), currentMovie(0)
  65. {
  66.     HIViewRef movieView;
  67.     HIObjectCreate(kHIMovieViewClassID, 0, reinterpret_cast<HIObjectRef*>(&movieView));
  68.     HIMovieViewChangeAttributes(movieView,
  69.                     kHIMovieViewAutoIdlingAttribute | kHIMovieViewControllerVisibleAttribute, 0);
  70.  
  71.     create(WId(movieView));
  72.     setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::MinimumExpanding);
  73.  
  74. }
  75.  
  76. MovieWidget::~MovieWidget()
  77. {
  78.    if (currentMovie)
  79.         DisposeMovie(currentMovie);
  80. }
  81.  
  82. void MovieWidget::dispose()
  83. {
  84.    if (currentMovie)
  85.         DisposeMovie(currentMovie);
  86. }
  87.  
  88. void MovieWidget::loadMovie(const QString &fileName)
  89. {
  90.    QTVisualContextRef visualContext = 0;
  91.     Boolean active = true;
  92.     DataReferenceRecord dataRef;
  93.     Movie oldMovie = 0;
  94.  
  95.  
  96.  
  97.     // create an array of properties for NewMovieFromProperties
  98.     // these properties describe how to create the new movie
  99.     // see Movies.h for the full list of available properties
  100.     QTNewMoviePropertyElement newMovieProperties[] = {
  101.         {kQTPropertyClass_DataLocation,     kQTDataLocationPropertyID_DataReference, sizeof(dataRef),       &dataRef,       0},
  102.         {kQTPropertyClass_NewMovieProperty, kQTNewMoviePropertyID_Active,            sizeof(active),        &active,        0},
  103.         {kQTPropertyClass_Context,          kQTContextPropertyID_VisualContext,      sizeof(visualContext), &visualContext, 0},
  104.     };
  105.  
  106.     CFStringRef cfString = CFStringCreateWithCharacters(0,
  107.                                     reinterpret_cast<const UniChar *>(fileName.unicode()),
  108.                                     fileName.length());
  109.     QTNewDataReferenceFromFullPathCFString(cfString, kQTPOSIXPathStyle, 0, &dataRef.dataRef, &dataRef.dataRefType);
  110.     CFRelease(cfString);
  111.  
  112.  
  113.     // if there's an old movie save it so we can dispose of it if
  114.     // we load up a new movie successfully
  115.     oldMovie = currentMovie;
  116.     currentMovie = 0;
  117.  
  118.     // create a new movie using movie properties
  119.     // when calling this function, you supply a set of input properties that describe the information
  120.     // required to instantiate the movie (its data reference, audio context, visual context, and so on)
  121.     NewMovieFromProperties(sizeof(newMovieProperties) / sizeof(newMovieProperties[0]), // the number of properties in the array passed in inputProperties
  122.             newMovieProperties,    // a pointer to a property array describing how to instantiate the movie
  123.             0,                        // number of properties in the array passed in outputProperties
  124.             0,                    // pointer to a property array to receive output parameters - 0 if you don’t want this information
  125.             &currentMovie);  // pointer to a variable that receives the new movie
  126.     // make sure to dispose of the dataRef we no longer need it
  127.     DisposeHandle(dataRef.dataRef);
  128.  
  129.     // set the HIMovieView's current movie
  130.     HIMovieViewSetMovie(HIViewRef(winId()), currentMovie);
  131.  
  132. 	if (oldMovie != 0)
  133. 	DisposeMovie(oldMovie);
  134.  
  135. 	if(currentMovie == 0)
  136. 	 emit NoPreview();
  137. // new movie has a new size, need to update.
  138.     updateGeometry();
  139.     emit optimalSizeChange();
  140.  
  141. }
  142.  
  143. QSize MovieWidget::sizeHint() const
  144. {
  145.     EventRef event;
  146.     HIRect optimalBounds;
  147.     CreateEvent(0, kEventClassControl, kEventControlGetOptimalBounds,
  148.                 GetCurrentEventTime(), kEventAttributeUserEvent, &event);
  149.     SendEventToEventTargetWithOptions(event,
  150.             HIObjectGetEventTarget(HIObjectRef(winId())),
  151.             kEventTargetDontPropagate);
  152.     GetEventParameter(event, kEventParamControlOptimalBounds, typeHIRect,
  153.                       0, sizeof(HIRect), 0, &optimalBounds);
  154.     ReleaseEvent(event);
  155.     return QSize(optimalBounds.size.width, optimalBounds.size.height);
  156. }
  157.  
  158. bool MovieWidget::nativeControlsVisible() const
  159. {
  160.     OptionBits currentBits = HIMovieViewGetAttributes(HIViewRef(winId()));
  161.     return currentBits & kHIMovieViewControllerVisibleAttribute;
  162. }
  163.  
  164. void MovieWidget::setNativeControlsVisible(bool visible)
  165. {
  166.     if (visible != nativeControlsVisible()) {
  167.         HIMovieViewChangeAttributes(HIViewRef(winId()),
  168.                 visible ? kHIMovieViewControllerVisibleAttribute : 0,
  169.                 !visible ? kHIMovieViewControllerVisibleAttribute : 0);
  170.         updateGeometry();
  171.         emit optimalSizeChange();
  172.  
  173.     }
  174. }
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Regards
Merry