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Editorial Team
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Asked: 2026-06-13T23:33:03+00:00

I am writing a little file/archives explorer and got an issue with interaction between

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I am writing a little file/archives explorer and got an issue with interaction between qt-based app and Skype chat window on Windows platform only.

When I try to drag-drop file (provided by QDrag with file-urls mime data) from my app to skype chat window, file is sent twice. The same I’ve got when tried to modify one of Qt drag-drop examples.

Skype version is 5.10.0.116. Bug is reproducible on Qt versions 4.7.3, 4.8.1, 4.8.3.

EDIT:

Have tried drag-drop interactions between several apps

  • My app -> Explorer = ok
  • My app -> Notepad++ = ok (displays content of file only in one tab)
  • My app -> WinRar = ok (creates archive with
    only one file)
  • My app -> TotalCommander = ok
  • My app -> ICQ = ok (only one file is sent)
  • My app -> Clementine (Qt based music player) = ok (only one file
    is added to playlist)
  • Explorer -> Skype = ok

But

  • My app -> Skype – file is sent twice
  • Clementine -> Skype – file is sent twice

EDIT2:

Also, qt-created mime data differs from created by explorer.

Qt:

  • 0 “text/uri-list” “file:///C:/Users/user/Pictures/myfile.ext”
  • 1 “application/x-qt-windows-mime;value=”UniformResourceLocatorW””
    “…” (I’ve replaced QByteArray contents with ellipsis)

Explorer:

  • 0 “application/x-qt-windows-mime;value=”Shell IDList Array”” “…”
  • 1 “application/x-qt-windows-mime;value=”UsingDefaultDragImage””
    “…”
  • 2 “application/x-qt-windows-mime;value=”DragImageBits”” “…”
  • 3 “application/x-qt-windows-mime;value=”DragContext”” “…”
  • 4 “application/x-qt-windows-mime;value=”DragSourceHelperFlags””
    “…”
  • 5 “application/x-qt-windows-mime;value=”InShellDragLoop”” “…”
  • 6 “text/uri-list” “file:///C:/Users/user/Pictures/myfile.ext”
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1 Answer

  1. Editorial Team

    I see, it’s not a problem if Qt, it’s wrong mime data processing on Skype side. Along with “text/uri-list”, Qt provides “UniformResourceLocatorW” value with the same data (i cant deny it, it is added a much deeper, than Qt user can get). And Skype processes both values – “text/uri-list” and “UniformResourceLocatorW”, causing sending the same file twice.

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