小编eyl*_*esc的帖子

我用conditional_variable::notify_all()唤醒一个等待的线程（只有一个线程在等待unique_lock 确实）。

这个代码片段在大多数情况下都运行良好，但日志文件（详细信息见下文）表明unique_lock在新创建的线程已经返回后，父线程无法获取。

我将不胜感激能在这个问题上得到一些帮助。

这是相关的代码片段：

void MainWindow::deployAction(void)
{
    std::condition_variable cvRunOver;
    std::mutex mtxRunOver;
    std::unique_lock <std::mutex> ulkRunOver(mtxRunOver);
    QString workerThreadRes;
    std::thread workThread([&]()
    {
        workThread.detach();

        do_some_process_for_seconds();
        
        cvRunOver.notify_all();
        LOG(INFO)<<"to leave the subthread";
        google::FlushLogFiles(google::GLOG_INFO);
        return;
    });

    while (cvRunOver.wait_for(ulkRunOver, std::chrono::milliseconds(100)) == std::cv_status::timeout)
    {
        qApp->processEvents();
        auto curTim = std::chrono::steady_clock::now();
        std::chrono::duration<float> escapedTim= curTim-lastTim;
        if(std::chrono::duration_cast<std::chrono::seconds>(escapedTim).count()>=5)
        {
            LOG(INFO) << "processEvents()";
            google::FlushLogFiles(google::GLOG_INFO);
            lastTim = curTim;
        }
    }
    
    LOG(INFO) << "get lock and continue to run";
    google::FlushLogFiles(google::GLOG_INFO);
}

以下是程序无法正常工作时的相关日志：

Log line format: [IWEF]hh:mm:ss.uuuuuu threadid file:line] …

我正在尝试构建一个简单的示例，在 PyQt 窗口中显示 HTML（包括 JavaScript 代码）：

python
import sys
from PyQt5.QtWidgets import QWidget, QApplication, QVBoxLayout
from PyQt5.QtWidgets import QApplication
from PyQt5.QtCore import QUrl,QDir
from PyQt5.QtWebEngineWidgets import QWebEngineView

class Example(QWidget):

    def __init__(self):
        super().__init__()
        vbox = QVBoxLayout(self)
        self.webEngineView = QWebEngineView()

        self.webEngineView.setHtml("""
            <!DOCTYPE html>
            <html lang="en">
              <head>
                <meta charset="utf-8">
                <script src="file:///home/path/to/jquery-3.6.0.min.js"></script>
              </head>
              <body>
                <!-- page content -->
                <span id="aaa">toto</span>
                <script>
                    $("#aaa").hide()
                </script>
              </body>
            </html>""")

        vbox.addWidget(self.webEngineView)
        self.setLayout(vbox)
        self.show()

sys.argv.append("--disable-web-security")
app = QApplication(sys.argv)
ex = Example()
sys.exit(app.exec_())

但显然，位于我的 Python 脚本旁边的 jQuery JavaScript …

MWE 演示这个问题是这样的：

#include <QMainWindow>
#include <QApplication>
#include <QWidget>
#include <QWebEngineView>
#include <QGridLayout>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QMainWindow w;

    auto w1 = new QWidget();
    w1->setLayout(new GridLayout());

    auto view = new QWebEngineView();
    view->load(QUrl("file://C:\\Users\\FruitfulApproach\\Desktop\\AbstractSpacecraft\\MathEnglishApp\\KaTeX_template.html"));
    view->show();
    w1->layout()->addWidget(view);
    w.setCentralWidget(w1);
    w.show();
    return a.exec();
}

KaTeX_template.html：

<!DOCTYPE html>
<html>
<head>
<title>MathJax TeX Test Page</title>
<script type="text/x-mathjax-config">
  MathJax.Hub.Config({tex2jax: {inlineMath: [['$','$'], ['\\(','\\)']]}});
</script>
<script type="text/javascript" async
  src="https://example.com/mathjax/MathJax.js?config=TeX-AMS_CHTML">
</script>
</head>
<body>
When $a \ne 0$, there are two solutions to \(ax^2 + bx + c …

谁能告诉我如何将命令的输出设置为变量？

基本上，我正在寻找与此bash示例等效的Python：

blah="ajsdlk akajl <ajksd@ajksldf.com>"
blah=$(echo "$blah" | cut -d '<' -f 2 | cut -d '>' -f 1)
echo "$blah"
ajksd@ajksldf.com

class Strength(State):
    def run(self, gamedata):
        print("You have 100 points to assign to your character.\n Start now to assign those Points to your characters strength, agility, speed and defense.")
        strenghtwert = int(input("STRENGTH: >>"))
        return AGILITY, gamedata, strenghtwert

    def next(self, next_state):
        if next_state == AGILITY:
            return CreatePlayer.agility

class Agility(State):
    def run(self, gamedata,strenghtwert):
        agilitywert = int(input("AGILITY: >>"))
        return SPEED, gamedata, strenghtwert, agilitywert

    def next(self, next_state):
        if next_state == SPEED:
            return CreatePlayer.speed

执行此操作时，出现错误：ValueError: too many values to unpack (expected 2)。我认为错误是return AGILITY, …

我有超过 10 个复选框。

我需要按用户创建一个选中的复选框列表，因为每个复选框都有自己的功能，该功能取决于选中的复选框的数量！

LRESULT CALLBACK MouseProc(int nCode, WPARAM wParam, LPARAM lParam)
{
    if (nCode == HC_ACTION)
    {
        if (wParam == WM_MOUSEMOVE)
        {
            cout << "X : " << GET_X_LPARAM(lParam) << " Y: " << GET_Y_LPARAM(lParam) << "\n";
        }
    }
    return CallNextHookEx(hMSHook, nCode, wParam, lParam);
}

    int _tmain() {
        HMODULE hInstance = GetModuleHandle(NULL);
        hMSHook = SetWindowsHookEx(WH_MOUSE_LL, MouseProc, hInstance, NULL);

        MSG Msg;

        while (GetMessage(&Msg, NULL, 0, 0)) { DispatchMessage(&Msg); }
        ::ReleaseDC(0, dc);

        return 0;
    }

结果 = 总是返回错误的坐标，

示例 = X = -1844，Y = 79， …

我试图一步一步地了解这个程序是如何工作的

for n in range(2, 10):
    for x in range(2, n):
        if n % x == 0:
            print(n, 'equals', x, '*', n//x)
            break
    else:
        # loop fell through without finding a factor
        print(n, 'is a prime number')

for i in range(2,2):
    print(i)

这段代码不打印任何内容，那么我包含的实际值是什么，它是否包含垃圾值。

Split() function uses whitespace string as separator and removes the empty strings, so I think there is no use using strip() or rstrip() function to remove extra whitespace in head or tail. And here is my example:

a = ' \n   1 2 3 4     \n\n 5 \n\n \t'
b = a.rstrip().split()
c = a.split()
print('b =',b)
print('c =',c)

The result turns out to be:

b = ['1', '2', '3', '4', '5']
c = ['1', '2', '3', '4', '5']

It …

实际上我可以使用Go语言中的两个循环来完成它,例如,如果我有数组:

["aa", "aab", "bcd", "a", "cdf", "bb"]

我需要使用maxLength返回字符串.所以输出将是:

["aab", "bcd", "cdf"]

这就是我在做什么.

package main

import "fmt"

func allLongestStrings(inputArray []string) []string {
    maxLength := len(inputArray[0])
    outputArray := []string{}
    for _, value := range inputArray {
        if len(value) > maxLength {
            maxLength = len(value)
        }
    }
    for _, val := range inputArray {
        if len(val) == maxLength {
            outputArray = append(outputArray, val)
        }
    }
    return outputArray
}

func main() {
    xs := []string{"aa", "aab", "bcd", "a", "cdf", "bb"}
    fmt.Println(allLongestStrings(xs))
}

是否可以在一个循环中执行此操作,因为我运行相同的循环两次以查找长度并在outputArray中追加字符串.

提前致谢.