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  1. Qt
  2. QTBUG-97112

QDrag / QDropEvent combase error : Class not registered

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Details

    • Bug
    • Resolution: Duplicate
    • P2: Important
    • None
    • 5.12, 5.14.2, 5.15.2
    • Active Qt, GUI: Drag and Drop
    • None
    • Windows 10 64-bit
    • Windows

    Description

      Standard QT drag / drop event code to transfer data between widgets produces a combase error and causes GUI thread to stall. Reproducable in QT examples in both debug and release builds with MINGW and MSVC.

      onecore\com\combase\dcomrem\resolver.cxx(2491)\combase.dll!00007FFD1A377992: (caller: 00007FFD1A2C2075) ReturnHr(1) tid(399c) 80040154 Class not registered

      Reproducible when a drag event is in progress but it is not catageorized as one of the following:

      • dragMoveEvent
      • dragEnterEvent
      • dragLeaveEvent
      • dropEvent

      In other words, if an item is dragged and mouse stops on the receiving widget.

      Related QT forum post:

      https://forum.qt.io/topic/123927/qdrag-qdropevent-combase-error-class-not-registered/14

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          duplicates

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-96234 QDrag::exec() produces thousands of error message "combase.dll: Class not registered"

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
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              owolff Oliver Wolff
              rtavakko Roham Tavakkoli
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              Dates

                Created:
                Updated:
                Resolved:

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