全部问题

这是代码本身

import cv2
import numpy as np
import imutils
import easyocr
from matplotlib import pyplot as pl

img = cv2.imread('images/lixiang.jpg')
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)

img_filter = cv2.bilateralFilter(gray, 11, 90, 15)
edges = cv2.Canny(img_filter, 50, 200)

cont = cv2.findContours(edges.copy(), cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)    
cont = imutils.grab_contours(cont)
cont = sorted(cont, key=cv2.contourArea, reverse=True)[:8]

pos = None
for c in cont:
    approx = cv2.approxPolyDP(c, 10, True)

    if len(approx) == 4:
        pos = approx
        break

mask = np.zeros(gray.shape, dtype='uint8')
new_img = cv2.drawContours(mask, [pos], 0, 255, -1)
bitwise_img = cv2.bitwise_and(img, img, mask = mask)

(y, x) = np.where(mask==255 )
(x1, y1) = (np.min(x), np.min(y))
(x2, y2) = (np.max(x), np.max(y))
crop = gray[x1:x2, y1:y2]

text = easyocr.Reader(['en'])
text = text.readtext(crop)

pl.imshow(cv2.cvtColor(crop, cv2.COLOR_BGR2RGB))
pl.show()

错误：

 CompleteTraceback (most recent call last):
  File "c:\Users\������������\OneDrive\������� ����\a\OpenCV\numbers_plates.py", line 34, in <module>
    text = easyocr.Reader(['en'])
           ^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\������������\AppData\Local\Programs\Python\Python311\Lib\site-packages\easyocr\easyocr.py", line 92, in __init__
    detector_path = self.getDetectorPath(detect_network)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\������������\AppData\Local\Programs\Python\Python311\Lib\site-packages\easyocr\easyocr.py", line 253, in getDetectorPath
    download_and_unzip(self.detection_models[self.detect_network]['url'], self.detection_models[self.detect_network]['filename'], self.model_storage_directory, self.verbose)
  File "C:\Users\������������\AppData\Local\Programs\Python\Python311\Lib\site-packages\easyocr\utils.py", line 628, in download_and_unzip
    urlretrieve(url, zip_path, reporthook=reporthook)
  File "C:\Users\������������\AppData\Local\Programs\Python\Python311\Lib\urllib\request.py", line 277, in urlretrieve
    reporthook(blocknum, bs, size)
  File "C:\Users\������������\AppData\Local\Programs\Python\Python311\Lib\site-packages\easyocr\utils.py", line 728, in progress_hook
    print(f'\r{prefix} |{bar}| {percent}% {suffix}', end='')
  File "C:\Users\������������\AppData\Local\Programs\Python\Python311\Lib\encodings\cp1251.py", line 19, in encode
    return codecs.charmap_encode(input,self.errors,encoding_table)[0]
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
UnicodeEncodeError: 'charmap' codec can't encode character '\u2588' in position 12: character maps to <undefined>

有两个表，第一个表垂直显示在 A 列 - 姓氏中，第 1 行显示日期，在姓氏和日期的交叉处我们输入 1 - 8 之间的数字（我们可以将单元格留空）。

需要填写表2的数据，条件是显示全名以及从和到期间的小时数（B栏）。

这些表是在不同的文档中创建的，我尝试通过 importrage 来完成，但没有成功。

在此代码中：

class _MenuWidget extends StatelessWidget {
    const _MenuWidget({Key? key}) : super(key: key);

    @override
    Widget build(BuildContext context) {
        return Container(
            color: Colors.white,
            width: double.infinity,
            child: const Column(children: [
                _MenuWidgetRow(icon: Icons.computer),
                _MenuWidgetRow(icon: Icons.computer),
                _MenuWidgetRow(icon: Icons.computer),
                _MenuWidgetRow(icon: Icons.computer),
            ],)
        );
    }
}

class _MenuWidgetRow extends StatelessWidget {
    final IconData icon;

    const _MenuWidgetRow({super.key, required this.icon});
    
    @override
    Widget build(BuildContext context) {
        return const Padding(
            padding: EdgeInsets.symmetric(horizontal: 16, vertical: 10),
            child: Row(
                children: [
                    Icon(icon), // Ошибка тут
                    SizedBox(width: 15),
                    Expanded(child: Text('test')),
                    Icon(Icons.chevron_right),
                ],
            ),
        );
    }
}

出现错误：

Arguments of a constant creation must be constant expressions.
Try making the argument a valid constant, or use 'new' to call the 
constructor.dartconst_with_non_constant_argument

这和什么有关系呢？将绿色的推向解决方案:)

我正在使用 MVVM 学习 WPF。

模型通常是 UI 所需的数据以及处理这些数据的一些方法。将创建一个单独的项目来访问数据。理论上，该级别不应该了解有关模型实体的任何信息。

有一个班级Teacher和TeacherGroup（老师担任的职位，例如物理学家和数学家）。

老师.cs：

public class Teacher
{
    public int Id { get; set; }
    public string FullName { get; set; }
    public List<TeacherGroup > Groups { get; set; }
}

TeacherGroup.cs：

public class TeacherGroup
{
    public int Id { get; set; }
    public string Name { get; set; }
}

这些是视图需要的模型实体。

如何正确地从数据库中获取这些数据并在架构上准确地将其传输到模型（填充实体）？创建一些 DTO 类或其他类。某种ObjectModel所有级别都可以访问的图书馆？

在 DAL 中，我计划创建一个类似于 的方法GetCurrentTeacher，该方法将从数据库接收有关当前教师及其所属组的数据。

如果可能的话，我想要一个带有例子的解释。

import { useState } from "react"
import "./HiddenText.css"

const TextList = [
    {textStart: "Twenty-five hours had passed since the incident. It seemed to be a lot longer than that.", 
    textEnd: " That twenty-five hours seemed more like a week in her mind. The fact that she still was having trouble comprehending exactly what took place wasn't helping the matter. She thought if she could just get a little rest the entire incident might make a little more sense.",
    threeDots: "...",  
    key: 1},

    {textStart: "Another productive way to use this tool to begin a daily writing routine.", 
    textEnd: " One way is to generate a random paragraph with the intention to try to rewrite it while still keeping the original meaning. The purpose here is to just get the writing started so that when the writer goes onto their day's writing projects, words are already flowing from their fingers.",
    threeDots: "...",   
    key: 2},

    {textStart: "Another productive way to use this tool to begin a daily writing routine.", 
    textEnd: " One way is to generate a random paragraph with the intention to try to rewrite it while still keeping the original meaning. The purpose here is to just get the writing started so that when the writer goes onto their day's writing projects, words are already flowing from their fingers.",
    threeDots: "...",   
    key: 3},

    {textStart: "Another productive way to use this tool to begin a daily writing routine.", 
    textEnd: " One way is to generate a random paragraph with the intention to try to rewrite it while still keeping the original meaning. The purpose here is to just get the writing started so that when the writer goes onto their day's writing projects, words are already flowing from their fingers.",
    threeDots: "...",   
    key: 4},


]

export default function HiddenText() {
    const [toggleText, setToggleText] = useState(false)
    const [toggleThreeDots, setThreeDots] = useState(true)
    const [textBtn, setTextBtn] = useState("показать дополнительно")

    function openText() {
        setToggleText(toggleText => !toggleText)
        setThreeDots(toggleThreeDots => !toggleThreeDots)
        
        if (textBtn === "показать дополнительно") {
            setTextBtn("скрыть")
        } else {
            setTextBtn("показать дополнительно")
        }
    }
    
    return(
        <div className="HiddenTextContainer">
            {
                TextList.map(item => {
                    return(
                        <div className="elemCartText" key={item.key}>
                            <p>

                                {item.textStart}
 
                                {toggleThreeDots && <span>
                                    {item.threeDots}
                                </span>}

                                {toggleText && <span>
                                    {item.textEnd}
                                </span>}

                            </p>

                            <button onClick={openText}>
                                 {textBtn}
                            </button>
                        </div>

                    )
                })
            }
        </div>
    )
}