Bug 88804 - LibreOffice blocks other applications from opening the MS Windows clipboard
Summary: LibreOffice blocks other applications from opening the MS Windows clipboard
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: LibreOffice (show other bugs)
(earliest affected) release
Hardware: x86-64 (AMD64) Windows (All)
: medium normal
Assignee: Not Assigned
Depends on:
Reported: 2015-01-26 12:07 UTC by A. S.
Modified: 2021-01-06 18:20 UTC (History)
3 users (show)

See Also:
Crash report or crash signature:


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Description A. S. 2015-01-26 12:07:18 UTC
LibreOffice (calc + writer, other not tested) blocks other applications from opening the clipboard (calls to OpenClipboard fail, because LibreOffice has opened it and not closed it). 

Steps to reproduce:

Create a program that calls
// Set/get some clipboard data

OpenClipboard fails sometimes (e.g. if calc or writer is open).
If you check who has opened it with GetOpenClipboardWindow you get a window handle from the LibreOffice application.

Kind regards,
Comment 1 V Stuart Foote 2015-01-26 17:03:00 UTC

Entirely possible this is the case, but it *IS* transient. If it were occurring always, no application other than LibreOffice would be able to access the Windows clipboard--i.e. EmptyClipboard and issue the WM_DESTROYCLIPBOARD message. That clearly is not the case.

You are probably aware that the behavior of the clipboard can be altered considerably by a "clipboard manager" holding the clipboard the clipboard and intercepting calls from other programs.  Do you have a clipboard manager installed?

Feel free to review the LibreOffice source, the Windows build clipboard resides in /dtrans/source/win32 with calls to SystemClipbaord.idl and XSystemClipboard.idl


The MS API and documentation is here:


I do believe LO implements just a subset of MS Clipboard API, and there certainly room to improve our interaction--up to and including a LibreOffice clipboard manager bundled extension (to service Linux/Windows/OS X).

Similar OS specific clipboard issues on Linux, bug 48783 and on OSX bug 49853 or even related Windows clipboard issue(s) of bug 62196
Comment 2 V Stuart Foote 2015-01-26 17:07:20 UTC
this is not a blocker in any sense
Comment 3 QA Administrators 2017-05-22 13:39:27 UTC
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