[Qt-interest] QMetaType::type succeeds or fails seemingly randomly

[Schimkowitsch Robert]

I generate a type name using two different ways, and come up with the
exact same string both times
(that is, I did a .toAscii for both, then compared each character in a
byte array, and they all come up equal).

Still, for one of the source strings, the resulting MetaType id is
valid, for the other string it is zero.

Here's my test code:

// First, write a user-defined enum to a QVariant
// The enum is defined in a Q_OBJECT-Class, and has Q_ENUMS and
Q_DECLARE_METATYPE applied to it
    CCmn_UIUpdateTimer::EUiActivityMode resultMode =
vActivityMode.value<CCmn_UIUpdateTimer::EUiActivityMode>();

// Assume we just get the QVariant, without knowing anything about the
enum
// Let's see how much we can find out using the MetaObject system
    QString enumTypeName = vActivityMode.typeName();
    QString enumParentTypeName = enumTypeName.section("::",0,0);
// Assume the enum's parent class is registered with "ClassName"*
    enumParentTypeName.append("*");
// Try to get the type id of the parent class, so I can get QMetaEnum
information
    int enumParentTypeId =
QMetaType::type(enumParentTypeName.toAscii());


// Comparison: Let's get the meta information directly from the enum's
parent object
    const QMetaObject& metaObject =
CCmn_UIUpdateTimer::staticMetaObject;
    int id = qMetaTypeId<CCmn_UIUpdateTimer*>();
    QString realClassType = QMetaType::typeName(id);
    int realId = QMetaType::type(realClassType.toAscii());

// Now output the results
    qDebug() << "Type name from qMetaTypeId" << realClassType
             << "Type id determined from realClassName"  << realId
             << "Type name determined from enum type name" <<
enumParentTypeName
             << "Type id determined from enumParentTypeName" <<
enumParentTypeId
             << "Type name comparison result"
             << realClassType.compare(enumParentTypeName);

The output looks like this:

Type name from qMetaTypeId "CCmn_UIUpdateTimer*"
Type id determined from realClassName 259 
Type name determined from enum type name "CCmn_UIUpdateTimer*" 
Type id determined from enumParentTypeName 0 
Type name comparison result 0

I have two identical strings. I use them both in QMetaType::type
Why does one return a type id, the other not?

Kind regards

Robert Schimkowitsch

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