crashes when you load image.

[simonmeaden]

the app crashes with a segmentation fault when I try to load the image. It pops up a message informing me that I need to set up Tesseract (done). The error message is:

!strcmp(locale, "C"):Error:Assert failed:in file baseapi.cpp, line 209 Segmentation fault (core dumped)

which seems to be the command

ASSERT_HOST(!strcmp(locale, "C"));

The locale is not "C" so this should pass.

Running on : Fedora Linux 30, but also happened on 29 QT 5.12.1 g++ (GCC) 9.0.1 20190312 (Red Hat 9.0.1-0.10)

[simonmeaden]

Just a further note I am using the latest tesseract version 5.0.0-alpha according to the VERSION file. the value of locale is "LC_CTYPE=en_GB.UTF-8;LC_NUMERIC=C;LC_TIME=en_GB.UTF-8;LC_COLLATE=en_GB.UTF-8;LC_MONETARY=en_GB.UTF-8" and tesseract from the installed build seems to work fine.

[simonmeaden]

OK I've done some investigation and looking at the TessBaseAPI code you get

const char *locale; locale = std::setlocale(LC_ALL, nullptr); ASSERT_HOST(!strcmp(locale, "C")); the value of setlocale with nullptr should return a minimal locale according to the docs but it doesn't seem to return "C" but "LC_CTYPE=en_GB.UTF-8;LC_NUMERIC=C;LC_TIME=en_GB.UTF-8;LC_COLLATE=en_GB.UTF-8;LC_MONETARY=en_GB.UTF-8" at least on my linux, strcmp returns a non-zero value which is what I would expect and ASSERT_HOST basically just builds the error message. I am not usually a C user as I use CPP almost exclusively unless working with a C library but to me it looks like the problem may be in the tesseract library which seems to expect "C".

[simonmeaden]

OK i take that back. I just noticed that you set the locale in TessTools line 78 with setlocale(LC_NUMERIC, "C"); if you use LC_ALL instead you do get "C" which the api expects and it works.

[zdenop]

this project was targeting for tesseract 3.05 ad it worked with it. I did not test it for tesseract 4.0 and about, because it use different approach for box file creations...

[simonmeaden]

OK I was writing an app to scan multiple page documents and found your app and wondered if I could use it. I'll go my own way as its well along anyway.

Regards Simon Meaden

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On 7 May 2019, 10:27, at 10:27, zdenop notifications@github.com wrote:

this project was targeting for tesseract 3.05 ad it worked with it. I did not test it for tesseract 4.0 and about, because it use different approach for box file creations...

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[zdenop]

thanks anyway: I fixed it in 75a68b466868ba41ba2886caa796057403fe1901.