Details
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Bug
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Resolution: Unresolved
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P2: Important
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None
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6.4.3
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None
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iOS/tvOS/watchOS
Description
We are tracking host addresses for which writing a datagram failed to skip them on the next broadcast attempt. For doing so, a QVector<QHostAddress> is used. When removing entries from this vector whenever a datagram was written successfully, we noticed some strange behaviour. The comparison operator QHostAddress::operator== returns true for addresses which seem to be different. A string comparion of QHostAddress::toString() returns false for these occurrences.
See the snippet below for which addresses/interface this happens:
operator== says true but toString() comparison says false for QHostAddress("ff02::1%utun3") QHostAddress("ff02::1%lo0") operator== says true but toString() comparison says false for QHostAddress("ff02::1%utun3") QHostAddress("ff02::1%anpi0") operator== says true but toString() comparison says false for QHostAddress("ff02::1%utun3") QHostAddress("ff02::1%en2") operator== says true but toString() comparison says false for QHostAddress("ff02::1%utun3") QHostAddress("ff02::1%utun0") operator== says true but toString() comparison says false for QHostAddress("ff02::1%utun3") QHostAddress("ff02::1%en0") operator== says true but toString() comparison says false for QHostAddress("ff02::1%utun3") QHostAddress("ff02::1%awdl0") operator== says true but toString() comparison says false for QHostAddress("ff02::1%utun3") QHostAddress("ff02::1%llw0") operator== says true but toString() comparison says false for QHostAddress("ff02::1%utun3") QHostAddress("ff02::1%utun1") operator== says true but toString() comparison says false for QHostAddress("ff02::1%utun3") QHostAddress("ff02::1%utun2")
Is this behaviour to be expected?
Minimal example:
const QHostAddress left("ff02::1%utun3"); const QHostAddress right("ff02::1%lo0f"); qDebug() << "operator==" << (left == right); qDebug() << "toString() comparison" << (left.toString() == right.toString());
The addresses are retrieved via QNetworkInterface::allInterfaces() and QNetworkInterface::allAddresses().