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  1. Qt
  2. QTBUG-84495

QByteArray/QMap behaves differently with Qt 5.15 from with older versions

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    • Icon: Bug Bug
    • Resolution: Invalid
    • Icon: Not Evaluated Not Evaluated
    • None
    • 5.15.0
    • Core: QString and Unicode
    • None
    • All Platforms. Qt 5.15
    • All

      I'm not sure this is a bug or intended in Qt 5.15. But this has caused problem with my code unless I apply fix in my code.

      In Qt 5.14.2, the following code:

      QVariantMap map; 
 map["Test"] = "Good"; 
 QVariantMap map2; 
 map2["json"] = QJsonDocument::fromVariant(map).toJson(QJsonDocument::Compact);
 qDebug() << QJsonDocument::fromVariant(map).toJson(QJsonDocument::Compact);
 qDebug() << QJsonDocument::fromVariant(map2).toJson(QJsonDocument::Compact);

       

      Will print out this:

      "\{\"Test\":\"Good\"}"
 "{\"json\":\"{\\\"Test\\\":\\\"Good\\\"}\"}"

      But in Qt 5.15, it will print out this:

      "\{\"Test\":\"Good\"}"
 "\{\"json\":\"eyJUZXN0IjoiR29vZCJ9\"}"

       

      The fix for me is pretty simple: 

      map2["json"] = QString(QJsonDocument::fromVariant(map).toJson(QJsonDocument::Compact));

      But still, would be nice if it works the way it worked before without having to fix the code. I want to confirm that this is not a bug but intended.

      Thanks!

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            thiago Thiago Macieira
            wtbuck Robert Wong
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              Created:
              Updated:
              Resolved:

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