[Interest] script invoked with QProcess cannot open files with spaces in path

[Larry Martell]

On Wed, Aug 31, 2016 at 4:34 AM, Viktor Engelmann
<viktor.engelmann at qt.io> wrote:
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> Am 31.08.2016 um 10:28 schrieb Viktor Engelmann:
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> Am 31.08.2016 um 02:02 schrieb Kyle Altendorf:
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> On August 30, 2016 7:44:14 PM EDT, Kyle Altendorf <sda at fstab.net> wrote:
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> On August 30, 2016 4:28:25 PM EDT, Larry Martell
> <larry.martell at gmail.com> wrote:
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> I am invoking a python script with QProcess. I have found that if the
> script tries to open a file that has spaces in the path, no error is
> thrown, but the file always appears to have 0 length. The same script
> with the same file with spaces in the path invoked from the command
> line works fine. Note that this has nothing to do with argument
> passing from the C++ code to the script via QProcess - the file path
> name is hardcoded in the script. If the file has no spaces in its path
> it is opened fine. I have tied escaping the spaces with \ but no joy.
> Anyone know why this would be happening and know a way around this?
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> Try printing sys.executable and os.getcwd() and see if they show any
> differences that might shed some light.  I'm on my phone so hopefully I
> am remembering those correctly.
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> Or, is the file being accessed or created by the calling C++ application?  Depending on how each opens it there could be a conflict of sorts there.
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> Interesting idea - if the C++ code creates the file and starts python without closing the file, that might explain the behavior... although the python script SHOULD throw an exception or something instead of "loading" an "empty file" - but such "improvements" wouldn't surprise me in python...
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> Viktor
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> Although... then it should also not work with filenames without spaces...

This indeed was the issue. The filename with spaces was being created
by the C++ code and the buffer had not been flushed. Adding a flush
fixed it. When I was testing with a filename without spaces I was not
using a file created by the C++ program. Much thanks to everyone who
replied and offered advice and suggestions.