Bug 221429

Summary:	KUniqueApplication doesn't work in windows
Product:	kde-windows	Reporter:	Joris Guisson <joris.guisson>
Component:	general	Assignee:	KDE-Windows <kde-windows>
Status:	RESOLVED FIXED
Severity:	normal	CC:	brandon.ml, krissn
Priority:	NOR
Version:	4.3
Target Milestone:	---
Platform:	Microsoft Windows
OS:	Microsoft Windows
Latest Commit:		Version Fixed In:
Attachments:	dbus-win32-kuniqueapplication.patch

Description Joris Guisson 2010-01-05 18:31:44 UTC

Version:            (using KDE 4.3.1)
OS:                MS Windows
Installed from:    MS Windows

Simply put you can open multiple instances of ktorrent on windows, in linux this is not possible and KUniqueApplication works as expected.

Comment 1 Christoph Feck 2010-01-05 20:05:21 UTC

Does DBus run?

Comment 2 Joris Guisson 2010-01-05 20:16:36 UTC

Yes dbus-daemon is running

Comment 3 Carlo Segato 2010-01-07 13:56:38 UTC

it works here with trunk

Comment 4 Krzysztof Nowicki 2010-04-19 11:04:06 UTC

Created attachment 42890 [details]
dbus-win32-kuniqueapplication.patch

Comment 5 Krzysztof Nowicki 2010-04-19 11:04:49 UTC

Hi,

I've been hunting down this bug and it seems that it's related to user privileges. I'm working on Windows XP without administrator rights and I hit this bug too.

I did some debugging and I tracked the problem down to DBus.

In bus/services.c, in function _dbus_process_exists() there is a call to OpenProcess(). The call requests PROCESS_ALL_ACCESS:

proc_handle = OpenProcess (PROCESS_ALL_ACCESS, FALSE, pid);

On my system this call fails with ERROR_ACCESS_DENIED.

If I change PROCESS_ALL_ACCESS to PROCESS_QUERY_INFORMATION it works.

The patch above contains the relevant code change.

Comment 6 Patrick Spendrin 2012-03-02 09:33:56 UTC

This works for a normal user in kontact (which is a KUniqueApplication) using mingw-w64 64bit on Windows 7 with the 4.8.0 release.
If that doesn't work, please reopen the bug report.