how to display the box object?

[samyuchao]

I create a box when new document, but it cannot be displayed in mayo. how to display the new object?

void Document::CreateBox()
{
// Open a new command (for undo)
this->NewCommand();

// A data structure for our box:
// the box itself is attached to the BoxLabel label (as his name and his function attribute)
// its arguments (dimensions: width, length and height; and position: x, y, z)
// are attached to the child labels of the box:
// 0:1 Box Label ---> Name --->  Named shape ---> Function
//     0:1:1 -- Width Label
//     0:1:2 -- Length Label
//     0:1:3 -- Height Label
//     0:1:4 -- X Label
//     0:1:5 -- Y Label
//     0:1:6 -- Z Label

// Create a new label in the data structure for the box
TDF_Label aLabel = TDF_TagSource::NewChild(this->Main());

Standard_Real aBoxWidth(30.0), aBoxLength(20.0), aBoxHeight(10.0);
Standard_Real aBoxX(0.0), aBoxY(0.0), aBoxZ(0.0);
Standard_CString aBoxName("OcafBox");
// Create the data structure : Set the dimensions, position and name attributes
TDataStd_Real::Set(aLabel.FindChild(1), aBoxWidth);
TDataStd_Real::Set(aLabel.FindChild(2), aBoxLength);
TDataStd_Real::Set(aLabel.FindChild(3), aBoxHeight);
TDataStd_Real::Set(aLabel.FindChild(4), aBoxX);
TDataStd_Real::Set(aLabel.FindChild(5), aBoxY);
TDataStd_Real::Set(aLabel.FindChild(6), aBoxZ);
TDataStd_Name::Set(aLabel, aBoxName); // Name

// Instantiate a TFunction_Function attribute connected to the current box driver
// and attach it to the data structure as an attribute of the Box Label
Handle(TFunction_Function) myFunction = TFunction_Function::Set(aLabel, TOcafFunction_BoxDriver::GetID());

// Initialize and execute the box driver (look at the "Execute()" code)
Handle(TFunction_Logbook) aLogBook = TFunction_Logbook::Set(aLabel);

Handle(TFunction_Driver) myBoxDriver;
// Find the TOcafFunction_BoxDriver in the TFunction_DriverTable using its GUID
if (!TFunction_DriverTable::Get()->FindDriver(TOcafFunction_BoxDriver::GetID(), myBoxDriver))
{
  std::cout << "Ocaf Box driver not found" << std::endl;
}

myBoxDriver->Init(aLabel);
if (myBoxDriver->Execute(aLogBook))
{
  std::cout << "Create Box function execute failed" << std::endl;
}

// Get the TPrsStd_AISPresentation of the new box TNaming_NamedShape
Handle(TPrsStd_AISPresentation) anAisPresentation = TPrsStd_AISPresentation::Set(aLabel, TNaming_NamedShape::GetID());
// Display it
anAisPresentation->Display(1);
// Attach an integer attribute to aLabel to memorize it's displayed
TDataStd_Integer::Set(aLabel, 1);
//myContext->UpdateCurrentViewer();

// Close the command (for undo)
this->CommitCommand();

}