2016-11-10 17:08 GMT+01:00 Joerg Bornemann <joerg.bornem...@qt.io>: > On 09/11/2016 14:24, Rainer Wiesenfarth wrote: > > Environment 1: Windows 10. >> - Dad starts first instance of Son => error message from Qt "QProcess: >> CreateNamedPipe failed. (access denied)" (3 times) >> > > This indicates that the pipes for stdin/stdout/stderr could not be created > for whatever reason. Would it be possible to provide an example that > exhibits the issue? >
I attach the four files I also added to the issue created with Qt support. Unfortunately, they could not reproduce the observed behavior on Windows 10. Here the text of the support issue: I create multiple QProcess instances from a worker thread, tying their > output > to the GUI. With Windows 7 this works as expected. > With Windows 10 the first (and only the first!) attempt fails, issueing > three > warnings "QProcess: CreateNamedPipe failed. (access denied)" and > showing no output of this first child process. However, any subsequent try > on > Windows 10 then also succeeds. > I attached two example programs (parent and child) and screenshots of both > Windows 7 and Windows 10. > Please build the child and parent program and place them in the same > folder, > then start the parent. Clicking the "Create Child" button stimulates > the desired action. I ran the test on multiple machines with both Windows 7 and Windows 10, but ran into that issue only on one of them. I would be happy if you could run the test on other machines (preferably Windows 10) to help locating the reason for this behavior. -- Software Engineer | Trimble Imaging Division Rotebühlstraße 81 | 70178 Stuttgart | Germany Office +49 711 22881 0 | Fax +49 711 22881 11 http://www.trimble.com/imaging/ | http://www.inpho.de/ Trimble Germany GmbH, Am Prime Parc 11, 65479 Raunheim Eingetragen beim Amtsgericht Darmstadt unter HRB 83893, Geschäftsführer: Dr. Frank Heimberg, Jürgen Kesper
CreateNamedPipeProblemChild.7z
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CreateNamedPipeProblemParent.7z
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