Russian Qt Forum

...
QString name(obj->metaObject()->className());

if ( name == "MyLabel" ) {
    <do_something>
    return;
}

if ( name == "QLabel" ) {
    <do_something_else>
    return;
}
...

 typeid(_MY_OBJECT_)

 typeid(ИМЯ_ТИПА)

#include<typeinfo>
...
MyLabel *lb;
QLabel *label;
...
void BlaClass::doIt(QObject *o)
{
 if(typeid(o)==typeid(QLabel)){
   // do something
 }
 else if(typeid(o)==typeid(MyLabel)){
   // do something
 }
 else{
 // what a fuck?!
 }
}

Q_DECLARE_METATYPE(MyType)
struct MyType
{
    int id;
    QString str;
};
qRegisterMetaType<MyType>("MyType");
QVariant var = index.data(Qt::UserRole);
if ( var.canConvert<MyType>() )
{
MyType mt = var.value<MyType>();
model->setData(index, QVariant(qVariantFromValue(mt)), Qt::UserRole);
}
else ...

static const char qt_meta_stringdata_frmNotation[] = {
  "frmNotation\0"
};

void *frmNotation::qt_metacast(const char *_clname)
{
  if (!_clname) return 0;
  if (!strcmp(_clname, qt_meta_stringdata_frmNotation))
    return static_cast<void*>(const_cast< frmNotation*>(this));
  if (!strcmp(_clname, "Ui::frmNotation"))
    return static_cast< Ui::frmNotation*>(const_cast< frmNotation*>(this));
  return QDialog::qt_metacast(_clname);
}

class MyBaseTypedObject : public QObject {
  ...
  virtual int GetTypeId( void  ) const = 0; 
};

switch (obj->GetTypeId()) {
  case OBJ_TYPE_1:
    ((MyObj1 *) obj)->DoSomething();
    break;
   ...
}