This is my "last version" of the code, i tried different things in both qml and c/c++, but the basic problem remains, how to "stop" my C/C++ application and
wait for the user press "OK" or "Cancel" button, and retrieve the value in my C/C++ code?


I've also tried the other way, instead of QDeclarativeEngine i used QDeclarativeView, i guess it doesn't make a difference in solving this issue?


C/C++
Qt Code: 
  1. QDeclarativeEngine *engine = new QDeclarativeEngine();
  2. QDeclarativeComponent component( engine, "modaldialog.qml" );
  3. QObject *myObject = component.create();
  4.  
  5. QGraphicsObject* graphicsObject =qobject_cast<QGraphicsObject *>(myObject);
  6. scene.addItem(graphicsObject);
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QML modaldialog.qml ( i use the modaldialog component from http://projects.forum.nokia.com/QMLTemplates)
Qt Code: 
  1. import QtQuick 1.0
  2. import "component" as Comp
  3.  
  4. Item
  5. {
  6.     width: 400; height: 400
  7.     // Visual is an item that defines some constants for the application
  8.     // look and feel, e.g. the font sizes & colors etc.
  9.     Comp.Visual
  10.     {
  11.         id: visual
  12.     }
  13.  
  14.     // Example on using ModalDialog component.
  15.     Comp.ModalDialog_t2
  16.     {
  17.         id: dialog_t2
  18.  
  19.         // Shown text can be set by modifying "text" property.
  20.         //text: "Click OK to Accept this dialog. To send it away, click Cancel."
  21.         // Always remember to define the size for the dialog.
  22.         anchors.fill: parent
  23.  
  24.         // Demonstrating how one could keep application wide variables saved
  25.         // in one place and use them conveniently all around the application.
  26.         fontName: "Helvetica"
  27.         fontColor: "#9DE352"
  28.         fontColorButton: "#9DE352"
  29.         fontSize: 16
  30.  
  31.         // Use these if you would like to change the Button look and feel.
  32.         // See Visual.qml how these are defined. Remember to modify also the
  33.         // ModalDialog.qml, since this functionality is disabled currently.
  34. //        buttonBackground: visual.buttonComponent
  35. //        buttonBackgroundPressed: visual.buttonPressedComponent
  36.  
  37.         onAccepted:
  38.         {
  39.             console.log("Dialog accepted signal received!");
  40.  
  41.            // I know could call a C/C++function here or send a signal, but, if this modal dialog is to be used/called in several places of C/C++ application
  42.            // how i could manage such thing?
  43.         }
  44.  
  45.  
  46.         onCancelled:
  47.         {
  48.             console.log("Dialog cancelled signal received.")
  49.         }
  50.     }
  51.  
  52.  
  53.  
  54.     function dialog_type_02()
  55.     {
  56.         dialog_t2.show();
  57.     }
  58.  
  59.  
  60.     // The model:
  61.     ListModel
  62.     {
  63.         id: list_model
  64.  
  65.         Component.onCompleted: dialog_type_02()
  66.     }
  67. }
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