How do I use Tesseract instances globally

[qwe1177]

first:

pub(crate) static ref tess: Mutex<tesseract::Tesseract> = {
let datapath ="/tesspath";
let language ="/tesslang";
let mut _tess = tesseract::Tesseract::new(Some(datapath ), Some(language )).unwrap();
Mutex::new(_tess)
};

after:

let tess = crate::tess.lock().unwrap().set_image_from_mem(&[255]);

error:

201 | let tess = crate::tess.lock().unwrap().set_image_from_mem(&[255]);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^--------------------------
| | |
| | value moved due to this method call
| move occurs because value has type Tesseract, which does not implement the Copy trait

reason:

I looked at the set_image_from_mem method:
pub fn set_image_from_mem(
mut self,
img: &[u8],
) -> Result<Self, plumbing::leptonica_plumbing::PixReadMemError> {
let pix = plumbing::leptonica_plumbing::Pix::read_mem(img)?;
self.0.set_image_2(&pix);
Ok(self)
}

Can you change ownership to variable borrowing？
I want to use tesseracet instances globally, without having to use a new instance each time

[ccouzens]

Hey,

It is this way to support a builder pattern.

But it should have been done better so we don't block this use-case of sharing across threads.

Is it possible for you to add a PR that supports both use-cases? Otherwise I'll get to it when I can, which might not be for a while.

Thanks,
Chris

[qwe1177]

OK,I‘ll try.

[qwe1177]

hi,I've implemented the multi-threading effect, and I've changed two things temporarily, so here's the code I changed：

1、
pub fn set_frame(
&mut self,
frame_data: &[u8],
width: i32,
height: i32,
bytes_per_pixel: i32,
bytes_per_line: i32,
) -> Result<&mut Self, plumbing::TessBaseApiSetImageSafetyError> {
self.0
.set_image(frame_data, width, height, bytes_per_pixel, bytes_per_line)?;
Ok(self)
}

2、
pub fn recognize(&mut self) -> Result<&mut Self, plumbing::TessBaseApiRecogniseError> {
self.0.recognize()?;
Ok(self)
}

Keep the package locally for now, and I'll use your new version when you've implemented multithreading：）