Read Aloud not working on Windows

[Koen De Groote]

I just ran into this on Windows10. On the 64 bit install and on the portable install, I'm trying to use the "Read Aloud" option and I'm getting this:

calibre, version 6.12.0
ERROR: Unhandled exception: <b>TypeError</b>:'size' must be &gt; 0

calibre 6.12 embedded-python: True
Windows-10-10.0.19044-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.19044')
Python 3.10.1
Windows: ('10', '10.0.19044', 'SP0', 'Multiprocessor Free')
Interface language: None
Traceback (most recent call last):
  File "calibre\gui2\viewer\tts.py", line 95, in action
  File "calibre\gui2\viewer\tts.py", line 101, in play
  File "calibre\gui2\tts\windows.py", line 117, in speak_marked_text
  File "calibre\gui2\tts\windows.py", line 76, in speak_current_chunk
  File "calibre\utils\windows\winspeech.py", line 415, in speak
  File "calibre\utils\shm.py", line 64, in __init__
TypeError: 'size' must be > 0

It seems to be coming from here: https://github.com/kovidgoyal/calibre/blob/master/src/calibre/utils/shm.py#L52-L64

Which seems to be about the ability to create shared memory.

[Kovid Goyal (kovid)]

Is this for a specific book? If so attach the book and I will try to
reproduce.

[Koen De Groote (koendg)]

It appears to be all epub and mobi files

[Koen De Groote (koendg)]

Example of each

[Kovid Goyal (kovid)]

Just scroll past the cover and it will work, there is a bug in this release that prevents it working on pages that have no text.

[Kovid Goyal (kovid)]

Fixed in branch master. The fix will be in the next release. calibre is usually released every alternate Friday.

 status fixreleased

[Koen De Groote (koendg)]

Thank you for your effort