Qprocess wait for finished. SGaist Lifetime Qt Champion.

Qprocess wait for finished View Profile View Forum Posts View Articles Novice Join Date Nov 2009 Posts 59 The system is OpenSUSE x64. That syntax is a c++ lambda. started() This is a signal that is emitted by the QProcess object. 6 days ago · However, if the waitForFinished() method was called earlier on the QProcess object, close() The QProcess destructor automatically calls close() when the object goes out of scope. 6. OpenModeFlag. Running a Process. 2 调用的方式和形式 Jan 15, 2022 · Same as QProcess is a subclass of QIODevice, QCoroProcess subclasses QCoroIODevice, so it also provides the awaitable interface for selected QIODevice functions. 0. 这个waitForFinished(2000)是让程序程等待process完成. I am using Qt 5. std::atomic<bool> recording; QProcess proc; std::unique_ptr<std::thread> recordingThread; The class: Jun 30, 2011 · The system is OpenSUSE x64. 并在process完成后发射finished() Apr 28, 2024 · process->waitForFinished(); QProcess还支持读取和写入进程的输入、输出和错误管道。通过write()函数向进程发送数据，readAllStandardOutput()和readAllStandardError()可以获取进程的输出和错误信息 Mar 29, 2021 · QProcess有一个signal叫做finished，具体定义如下： void QProcess::finished(int exitCode, QProcess::ExitStatus exitStatus) 当进程结束的时候，该signal会被发射出去。exitCode就是进程的退出码，而exitStatus就是退出状态。 若在一个系统服务中，想保持另一个进程始终处于运行状态（比如某server），那么就可以connect这个 Oct 8, 2019 · 一般我们使用QProcess执行命令时都会执行waitForFinished等待程序执行完成。细看接口可以看到它有默认的超时时间(30s)，如果超过30s就会中断执行。如果我们执行某些耗时操作又没有设置超时时间则会导致一直中断执行从而得不到想要的结果。 Jan 8, 2025 · See also started(), waitForReadyRead(), waitForBytesWritten(), and waitForFinished(). 6k次。文章详细描述了如何在Qt中使用QProcess进行进程管理和遇到的问题，如启动后不关闭、阻塞问题。作者指出使用waitForFinished和waitForStarted的方法以及它们的超时选项，并强调在子线程处理以保持UI响应。 Jun 3, 2020 · @Kyeiv No idea, should work. I found what was causing the missbehavoir I had a Qprocess in a constructer of a other class. Hi, It's because you are calling startDetached (which by the way is a static function). Returns bool indicating whether the process has started successfuly or timed Dec 5, 2022 · Your QProcess instance needs to exist longer than the process it is managing. I think I'll do that . Feb 12, 2025 · While QProcess is a powerful tool for interacting with external processes in Qt, there are alternative approaches that might be suitable for specific use cases:. 6k次，点赞21次，收藏33次。在理解Qt QProcess之前，让我们先了解什么是进程。进程是操作系统的一个核心概念。当程序在执行时，它将产生多个进程，每个进程都有自己独立的数据空间，这样就可以同时有多个用户执行同一程序，而 Sep 25, 2020 · Hello, I have been struggling for a few days trying to make my Qt application to execute another application by using a QProcess and waiting for its completion by connecting to the finish signal. 04. start Feb 25, 2018 · 1. ; No guarantee of immediate termination The process may still take some time to respond to the termination signal and complete its Nov 25, 2015 · 文章浏览阅读2. The QProcess API offers methods to manipulate the environment variables that the child process will see. Thanks for any reply. **VLC 参数设置不当** 如果传递给 VLC 的命令行参数错误或不符合其支持的语法，可能会导致 VLC 立即 Sep 18, 2021 · As mentioned on microsoft forum post, most likely when building 32-bit app (which I was doing), it makes mstsc call of 32-bit version mstsc, which calls the correct 64-bit version and closes original process that was called from QT app. I have tried two different ways: QProcess *proc = new QProcess(this); Sep 24, 2015 · I don't believe you can do what you want by inspecting only the return value from QProcess::waitForFinished. QProcess. S Offline. I have tried to launch "Task Manager" with CTRL+ALT+DELETE however there was no response on Windows also. QString QProcess:: workingDirectory const. I used startDeatched(), because I thought I could get live output somehow. Feb 12, 2025 · Terminating Processes in Qt . readLine(); // Process the line} ; Purpose Provides a Jan 9, 2023 · 文章讨论了QProcess在Qt程序中的使用，特别是在阻塞模式下对主线程的影响。当使用waitForFinished()等方法时，主线程会被阻塞，导致界面卡顿。为了解决这个问题，提出了使用QApplication::processEvents来非阻塞地处理进程，但需注意可能引发的 Oct 19, 2022 · QProcess, and Qt IO in general, does not run unless the program returns to the Qt event loop. You can use waitForFinished for your process to finish. It aims to fit in with these APIs as much as possible. 进入容器假设您已经有一个名为 my-project1 的容器正在运行，并且您想要进入该容器并运行一些命令，您可以使用以下命令：docker exec -it my-project1 bash命令解释docker exec: 是 Docker CLI 的一个命令，用于在已经运行的容器中执行命令。 Feb 12, 2025 · Here are the possible return values of QProcess::state(): QProcess::Exited The process has exited. QProcess This is a class in Qt that represents a process running outside the Qt application. QProcess的waitForFinished() 方法：阻塞当前线程，直到被监控的进程结束或给定的超时时间到达 QProcess 的 waitForFinished() 方法在 Qt 中用于阻塞当前线程，直到被监控的进程结束或给定的超时时间到达。此方法有几种不同的调用方式，可以接受不同 This is an experiment, which I mostly wrote for fun - use it at your own risk. I did however get waitForFinished to return false when I called start() in one slot (attached to QPushButton I press) and waitForFinished in another slot (from a different QPushButton I press). waitForBytesWritten() blocks until one payload of data has been Mar 5, 2025 · Issue Calling QProcess::kill() on a process that has already terminated might result in undefined behavior. SGaist Lifetime Qt Champion. I changed it to this: above still the same fd. Mar 4, 2025 · bool QProcess::waitForFinished(int msecs = 30000) 阻塞直到进程完成并且 finished 信号被发出，或者直到 msecs 几毫秒过去了。 如果过程完成，则返回 true ；否则返回 false （如果操作超时、发生错误或此 QProcess 已完成）。 此函数无需事件循环即可 Feb 24, 2019 · I am using Qt 5. Troubleshooting. Python QProcess. 09 16:47 浏览量：9 简介：本文将详细解析 QT 框架中 QProcess 类的 waitForFinished 方法在使用过程中可能遇到的陷阱，包括阻塞问题、信号槽机制的影响等，并提供相应的解决方案和最佳实践建议。 Feb 24, 2019 · I am using Qt 5. 1 Reply Last reply . 就是在process完成前不做任何事,阻塞在那里. I am starting this console application C1 from another console application C2. sudo or passwd) are implemented, prevents intercepting the password input. The process is started, I'm sure because it has a GUI itself (and it opens) and waitForFinished() seems to wait for something because when it starts it will wait like 30secs into the program till it thinks about just leaving me in the rain - in contrast to this, if I leave out waitForFinished() it just continues with the routine in my QtApp right away. 1 QProcess是什么？： 概念： QProcess类是用来启动一个外部程序并与之通信。简单来讲就是使用QProcess类可以调用其他的可以执行的程序，产生你想要结果的工具。1. setStandardOutputFile (fileName [, mode=QIODeviceBase. But if I include the waitforfinished() signal, I don't get the finished signal*. Dec 13, 2024 · 在下文中一共展示了QProcess. Feb 24, 2019 · I am using Qt 5. dll I found it was crashed at QProcess. Here is my code, I use Qprocess to execute a command and wait it finished. So it does call a function but unlike @Shahina sample where the slot is a stand alone function, the lambda is in same place as the connect. QJson与Qt容器 1. Arguments are supplied as individual strings in a QStringList. Disadvantages Can be more complex to use and might not be portable across platforms. waitForFinished - 55 examples found. Switched my QT project to build 64 bit application and it fixed my problem - now finished() signal is being emitted exactly after RDP Jun 19, 2021 · QProcess类提供了三个函数 1、QProcess::execute() 以堵塞方式的执行shell命令，当命令执行完成后，调用进程才会继续执行。 命令输出的任何数据都将转发给调用进程输出(因此无法捕获)。2、QProcess::start() 以异步方式的执行shell命令，命令输出的数据存储于缓冲区，可以通过readAllStandardOutput()捕获 3、QProcess Jun 24, 2022 · Hi @JonB, I wrote it wrong. QProcess::Starting The process is in the process of starting. Feb 16, 2023 · QProcess使用waitForFinished 一般我们使用QProcess 执行命令时都会执行waitForFinished等待程序执行完成。细看接口可以看到它有默认的超时时间(30s)，如果超过30s就会中断执行。如果我们执行某些耗时操作又没有设置超时时间则会导致一直中断执行从而得 waitForFinished() Waits for the process to finish or until it times out. Also test with a different Oct 27, 2023 · QProcess中waitForFinished的问题，当我们执行一个超过30s的动作的时候，int msecs = 30000，那么就会直接finish，像遇到解压文件这种情况并且要等finish时候用解压的文 Mar 12, 2024 · 同时，也可以使用 QProcess::finished() 信号来接收进程完成的信号，然后在槽函数中进行处理，而不需要阻塞主线程。 具体实现可以参考以下代码示例： QByteArray data = Jun 12, 2020 · 若调用的外部程序执行完成后不会自动退出，需要用户按任意键才会退出，这时不管是使用静态调用方式还是调用QProcess::waitForFinished(int msecs = 30000)都会浪费大量的时间，waitForFinished默认等待三十秒，超时会自动杀死进程，当参数为-1时一直 Dec 22, 2014 · void MainWindow::processFinished(int exitCode, QProcess::ExitStatus exitStatus) {qDebug() << "Hii";} @ Thank you. 4w次，点赞9次，收藏33次。当QThread线程的run（）函数return之后，该线程就会发出finished（）信号。但是，有时候，在finished（）信号的槽中，发现该线程依然正在运行，即没有真正的finished，通过调研running（）方法，或者 May 31, 2023 · A：waitforfinished是Qt框架中的一个函数，用于让当前线程等待另一个线程执行完毕。可以通过QProcess类中的waitforfinished函数来实现等待某个进程执行完毕后再进行后续操作。" ### 回答2： Qt提供了QProcess类来帮助我们在程序内启动外部进程并与之 Feb 12, 2025 · While QProcess is a powerful tool for interacting with external processes in Qt, there are alternative approaches that might be suitable for specific use cases. waitForReadyRead() blocks until new data is available for reading on the current read channel. This means that any modifications performed using qputenv() prior to that call will be Oct 4, 2011 · use QProcess::waitForFinished with a 3 sec timeout and check the condition of QProcess weather it has finished or not. This here: QProcess * canup; canup = new QProcess(this); QStringList args; args << "can0" << "up"; Oct 19, 2011 · Unfortunately, I ran into the issue that the GUI keeps freezing when after I start the process and waitForFinished(-1). startDetached("/bin/sh", May 11, 2016 · Call waitForStarted () to make sure the process has started (or has failed to start) and those signals have been emitted. start("tasklist"); process Feb 24, 2019 · I am using Qt 5. Here are some of them: System Calls. This doesn't integrate with asyncio (see qasync for that) or trio (see qtrio), or any other Python async libraries. Apr 18, 2015 · I’m trying to start a QProcess from a thread. waitForStarted() Waits for the process to be started or until it times out. readAllStandardOutput()); while (!stream. Oct 8, 2019 · 一般我们使用 QProcess 执行命令时都会执行 waitForFinished 等待程序执行完成。 细看接口可以看到它有默认的超时时间 (30s)，如果超过30s就会中断执行。 如果我们执行某 Feb 12, 2025 · If you need to perform other tasks while waiting for the process to finish, you can use QProcess::waitForStarted() to wait for the process to start and then use Apr 9, 2024 · waitForFinished 方法是 QProcess 类中的一个重要方法，用于等待外部进程执行完毕。 然而，在实际使用中，waitForFinished 方法可能会带来一些陷阱，本文将对这些陷阱进行 Jan 31, 2025 · When the process exits, QProcess reenters the NotRunning state (the initial state), and emits finished (). QtCore. start("powershell", command); while(fd. ; Sep 19, 2011 · I haven't verified this but I assume that QProcess emits various signals which aren't processed because QProcess::waitForFinished() blocks your event loop and thus no event handling (signal processing) occours. QProcess Object Destruction Before Process Termination. mode – OpenMode. 强大的QProcess +隐式共享2. Mar 14, 2020 · 一般我们使用QProcess执行命令时都会执行waitForFinished等待程序执行完成。细看接口可以看到它有默认的超时时间(30s)，如果超过30s就会中断执行。如果我们执行某些耗时操作又没有设置超时时间则会导致一直中断执行从而得不到想要的结果。 Nov 10, 2023 · 文章浏览阅读1. Code for C1 is as follows: May 12, 2024 · 在默认情况下，`QProcess::start()`是不会阻塞当前线程的，它会启动一个新的进程并立即返回。这意味着，如果您在主线程中调用`start()`，它将立即返回并继续执行后续代码，而不会等待进程执行完成。 Aug 24, 2023 · 进程就是一个程序的执行实例，也就是正在运行的程序。对操作系统来说，进程就是一个担当分配系统资源CPU时间、内存的实体。在Qt 中，我们使用QProcess来表示一个进程。这个类可以允许我们的应用程序启动一个新的外部程序，并且与这个程序进行通讯。 1 day ago · While QProcess::readyReadStandardOutput() is a common approach for handling process output in Qt, there are alternative methods that might be suitable for specific use cases:. roseicollis. Re: How to wait for process to finish Mar 19, 2024 · 文章浏览阅读8. Try running python/python3 as the command instead of relying on file association. g. waitForFinished方法的15个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。 Jan 2, 2017 · Hi Just as note. Dec 23, 2024 · 四、总结 在 Qt 中，处理进程间通信（IPC）非常方便。通过 QProcess 类，我们能够轻松启动和管理外部进程，并通过管道和重定向进行输入输出的交互。 此外，Qt 还提供了 QSemaphore 和 `QShared Memory` 类，帮助我们管理线程同步和进程间共享 Dec 22, 2024 · 在上一篇文章中，我们介绍了taskBus的原理。最近这段时间，主框架仍旧在密集的迭代中。通过在Linux及win32下，实现内存监视，我们已经能够实时监视各个模块的资源使用。文章目录1. Dec 4, 2024 · 前言 需求是判断win系统中，Qt 拉起某个程序，如果程序不存在则拉起，存在则实现程序进程切换，如果要进行这样的逻辑操作，就必须要判断程序的进程是在存在，是否已经启动成功！下面是实现代码。 实现代码 bool IsProcessExist(const QString &processName) { QProcess process; process. When you finally call waitForFinished() the program is allowed to run to end and exit, at which point it flushes and closes the stdout buffer, and all the output probably arrives at the same time in your calling program. Last week, I have watched infinite freeze on my application on Windows 10 once. By default, the child process will have a copy of the current process environment variables that exist at the time the start() function is called. waitForStarted() blocks until the process has started. OTOH, if you rsync into a remote machine, you can pretty Dec 21, 2021 · 本文内容由阿里云实名注册用户自发贡献，版权归原作者所有，阿里云开发者社区不拥有其著作权，亦不承担相应法律责任。具体规则请查看《 阿里云开发者社区用户服务协议》和 《阿里云开发者社区知识产权保护指引》。如果您发现本社区中有涉嫌抄袭的内容，填写 侵权投诉表单进行举报，一经 Jun 30, 2011 · The system is OpenSUSE x64. QProcess::execute() This static method provides a simpler interface for executing commands directly, but it doesn't offer the same level of control as creating a QProcess object. ; Advantages Can provide fine-grained control over process execution. Here is my example: My class variables are. Mar 24, 2011 · Everytime I try to use a QProcess object I get the message: QProcess: Destroyed while process is still running. I have tried this way: connect(&proc, QOverload<int, QProcess::ExitStatus>::of(&QProcess::finished), [=](int exitCode, QProcess::ExitStatus Apr 9, 2024 · QProcess在Linux下不产生finished信号或waitForFinished阻塞超时的问题可能由多种原因引起，包括外部程序的问题、信号与槽连接问题以及子进程阻塞等。 通过检查外部程序、检查信号与槽连接、设置超时时间、监听错误信号以及使用调试和日志记录功能，可以有效地解决这些 Sep 21, 2020 · After I dump the exe and Qt5Core. You can use QProcess::waitForFinished() to wait for the process to May 15, 2017 · bool QProcess:: waitForFinished ( int msecs = 30000) 阻塞直到进程已完成且 finished () 信号已发射，或直到 msecs 毫秒已过去。 返回 true 若进程已完成；否则返回 false (若操作超时，若发生错误，或者若此 QProcess 已完成)。 Oct 26, 2024 · 在进行编程过程中，经常用到在程序当中调用其它的程序，这就需要用到进程调用，在QT中就用到了QProcess的进行进程调用，其有QT自身的特点，用起来非常方便，与C++本身的接口不一样，其流程特点如下： 特点1：需要waitForStarted，判断程序启动是成功，还是失败 特点2：需要waitForFinished，判断程序 Jul 17, 2017 · QProcess使用waitForFinished 一般我们使用QProcess执行命令时都会执行waitForFinished等待程序执行完成。细看接口可以看到它有默认的超时时间(30s)，如果超过30s就会中断执行。如果我们执行某些耗时操作又没有设置超时时间则会导致一直中断执行从而得 Aug 2, 2024 · 上述代码使用start()函数启动记事本应用程序，并打开名为"file. QProcess::Running The process is currently running. It doesn't crash every time, the crash possibility may lower than 0. state() == QProcess::Running) { qDebug() << fd. IMHO, if you're going to use the QProcess::waitForFinished method, you should probably make sure your process has started by Oct 28, 2023 · 在下文中一共展示了QProcess. 可以想像，它对其它进程的操作方式，就像读写一个文件一样方便。下面浏览它的公共函数：QProcess(QObject * parent = 0)virtual~QProcess()voidsetProgram(const QString & program)//设置需 Dec 16, 2023 · @BwvB The way rsync (and most of the cmd tools dealing with passwords, e. Frameless Window Helper. cpp #include <QtCore/QCoreApplication> #include "process. Key points about QProcess::terminate() Returns immediately The terminate() function returns immediately after sending the termination signal, without waiting for the process to actually stop. QTextStream: Usage QTextStream stream (&process. This means that any modifications performed using qputenv() prior to that call will be May 1, 2024 · 好的，您的第一个问题是关于使用 QProcess 的 waitForFinished 方法阻塞程序并在超时时退出的问题。那么，这个问题的解决方案是使用 QProcess 的 waitForFinished 方法，并结合 QTimer 实现超时判断。代码示例如下： ``` QProcess process; process. but you made me think about a different way of approaching the problem . txt"的文本文件,需要注意的是，start()函数只是启动外部进程，并不会等待外部进程完成。如果需要等待外部进程完成，可以使用QProcess::waitForFinished()函数，或者使用QProcess的其他函数来进行进一步的进程 Jan 19, 2025 · QProcess是Qt库中用于处理外部进程的工具类。如果你想要监听一个外部进程是否结束，你可以使用它的`waitForFinished()` 函数。这个函数会阻塞直到指定的进程完成 首页 qprocess监听进程是否结束 qprocess监听进程是否结束 时间: 2025-01-19 12:09:21 2 days ago · Qt QProcess Started Signal . waitForBytesWritten方法的5个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。 Nov 7, 2023 · QProcess中waitForFinished的问题，当我们执行一个超过30s的动作的时候，int msecs = 30000，那么就会直接finish，像遇到解压文件这种情况并且要等finish时候用解压的文件的时候，就会出现问题。方法1：waitForFinished(-1);表示一直等待，直到进程结束。结束。 I am running console application C1 in QProcess. For example, the Nov 6, 2016 · QProcess *myProcess = new QProcess(parent); myProcess->start(program);//third This one is creating the object and starting it, but your application does not wait and continues with processing. If you flip it around and assume that it would actually possible to react in QProcess, this would be the ideal way to find out someone's password. If QProcess has been assigned a working directory, this function returns the working directory that the QProcess will enter before the program has started. fileName – str. 3 with vs2013 x64 and am using QProcess::waitForFinished function in a slot function on GUI application. Truncate]) ¶ Parameters. Sep 1, 2024 · QProcess是一个为进程间通信创建的类。在linux相关系统中，可以很方便地用它调用执行命令。它继承自QIODevice. See QCoroIODevice documentation for details. It assumes you're doing things the Qt way - QProcess for subprocesses, QThread for threads, QNetworkRequest for HTTP, and so on. QProcess： 内容：学习QProcess的相关概念及作用 1. In turn, I chose the route of creating a QThread, with the QProcess in it, so when it runs, I can waitForFinished(-1) without freezing the GUI. nthung. See documentation for [QProcess::waitForFinished()][qtdoc-qprocess-waitForFinished] for details. **异步处理**：设置QProcess的waitForFinished()方法为非阻塞，然后通过connect信号槽机制，当进程完成后，再处理结果。 QProcess::waitForFinished() always returned true (my process was "/bin/echo test"). Mar 8, 2024 · 在具体实现Qt调用CMD启动外部程序时，QProcess类提供了一系列方法，如start()用于启动子进程，state()用于查询子进程的状态，readAll()用于读取子进程的标准输出，以及waitForFinished()等用于等待子进程完成。 Apr 9, 2024 · QT 随笔：深入解析 QProcess 中 waitForFinished 的陷阱与解决方案 作者：有好多问题 2024. I've seen a couple of other examples as well, without really understanding how to do it, and how QProcess works. As soon as QProcess::waitForFinished() returns the events pending in the event loop are processed and the pending signals are emitted, even though Nov 11, 2024 · 文章浏览阅读644次，点赞4次，收藏10次。QProcess是Qt框架提供的一个类，它用于在应用程序中执行外部进程。QProcess waitForFinished() ：阻塞当前线程，直到外部进程执行完成。readAllStandardOutput()：读取外部进程的标准输出数据 Aug 9, 2017 · The QProcess class is used to start external programs and to communicate with them. To start a process, pass the name and command line arguments of the program you want to run as arguments to start(). Problem is: *If I comment the waitforfinished() code, I don't get the finished signal. 1%. The finished () signal provides the exit code and exit status of the Dec 22, 2014 · { connect(&process, SIGNAL(finished(int, QProcess::ExitStatus)),this, SLOT(processFinished(int, QProcess::ExitStatus))); process. In Method 1 QProcess:start() runs start, which returns ('finishes') quickly, and then the QProcess is destroyed while the command shell(s) involved are still running. Proper Destruction Ensure that the QProcess object is destroyed after the process has terminated. Returns bool indicating whether the process has finished successfuly (true) or timed out (false). QProcess::waitForFinished() can be dodgy, especially if under Windows (and if you are under Windows how do you expect executing a . Cheers, _ 22nd December 2014, 13:06 #3. Apr 9, 2024 · QProcess在Linux下不产生finished信号或waitForFinished阻塞超时的问题可能由多种原因引起，包括外部程序的问题、信号与槽连接问题以及子进程阻塞等。 通过检查外部程序、检查信号与槽连接、设置超时时间、监听错误信号以及使用调试和日志记录功能，可以有效地解决这些 Jan 9, 2023 · 作者使用QProcess的start()方法异步执行命令，同时展示了一个加载动画的等待界面，并通过waitForFinished (-1)确保命令执行完成。遇到的问题是界面卡死，解决方案是将QProcess调用放到单独的线程中，通过QtConcurrent::run解决。 QtUI界面被QProcess Apr 18, 2024 · QProcess::waitForFinished() 是一个同步函数，用于等待外部程序执行完成。当使用 QProcess 启动一个外部程序时，start() 方法会立即返回，不会等待被启动程序的结束。这允许主程序继续执行其他任务，而外部程序在后台运行。然而，如果需要在程序执行 Sep 8, 2022 · QProcess::waitfinished函数用于等待进程执行完毕，确保所有结果可用。 Mar 12, 2024 · 好的，您的第一个问题是关于使用 QProcess 的 waitForFinished 方法阻塞程序并在超时时退出的问题。那么，这个问题的解决方案是使用 QProcess 的 waitForFinished 方法，并结合 QTimer 实现超时判断。代码示例如下： Jun 30, 2011 · The system is OpenSUSE x64. What is happening is when the process has a problem like being unable to open the input file, the QProcess does not actually finish or exit. I meant get live output out of that QProcess. By default, Windows start does not wait for its child process to complete. QProcess是异步的,所以程序的star () Jun 3, 2020 · Consider whether QProcess::execute() might be an improvement on waitForFinished() anyway, or test it with proper signals & slots. Starting the process works and the process runs correctly but my problem is that the finished() signal is never emitted. I would be very much questioning my sanity if Oct 24, 2024 · QProcess 的finished，文章目录项目场景：问题描述以及分析过程：defunct（僵尸进程）: 主要关注其创建的原来、以及waitforfinished函数、finished 信号等产生的原理： QT的通信可分为QT内部通信和外部通信两大类；QProcess进程的三个接口实现 1 day ago · QProcess 调用 VLC 时发生闪退，并卡死在 `waitForFinished()` 的问题是比较常见的场景。以下是可能的原因及解决办法： ### 可能原因分析： 1. h" Feb 24, 2019 · I am using Qt 5. Oct 24, 2018 · QT提供了一个QProcess类用于启动一个外部程序并与之通信。QProcess::start()与QProcess::execute()都能完成启动外部程序的任务，二者有什么区别呢？区别在于start()是非阻塞的，而execute()是阻塞的。专业点讲，execute()=start()+waitforFinished()。 Apr 27, 2016 · 1. In fact it will also flush Feb 6, 2013 · Hello I have a small example: main. You can rate examples to help us improve the quality of examples. waitForFinished方法的12个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。 Apr 9, 2024 · 此外，QProcess还提供了exitCode()函数来获取外部程序的退出码，以及waitForFinished()函数来等待程序执行完毕。 四、进程同步与异步 QProcess支持同步和异步两种进程管理方式。在同步模式下，你可以使用waitForStarted()、waitForFinished()等函数来阻塞 Jan 24, 2025 · Environment variables¶. then you can emit the appropriate signal. QProcess::Exiting The process is in the process of exiting. . waitForFinished(); //not sure where to put this Apr 21, 2016 · I'm not shure if is my preferred solution . View Profile View Forum Posts View Articles Intermediate user Join Date Dec 2014 Posts 82 Thanks 10 Qt products Platforms. A in place function. 强大的QProcess +隐式共享 taskBus 能够顺利吞吐数据的关键因素是强大的 QProcess 。 Jul 4, 2014 · Seen that I could use QProcess, but reading the documentation, I really didnt feel any smarter. This generates the overt warning. py file to work?), and Oct 21, 2024 · QProcess使用waitForFinished 一般我们使用QProcess执行命令时都会执行waitForFinished等待程序执行完成。细看接口可以看到它有默认的超时时间(30s)，如果超过30s就会中断执行。如果我们执行某些耗时操作又没有设置超时时间则会导致一直中断 Feb 13, 2017 · @LogiSch17 said in QProcess doesn´t emit finished() when done: So for everyone who is interrested. atEnd()) { QString line = stream. Mar 30, 2024 · `waitForFinished(-1)` 是 `QProcess` 类的一个成员函数，它的作用是等待进程执行结束。 函数的参数是一个毫秒数，如果传入 `-1`，表示等待进程一直执行直到结束。 Feb 17, 2025 · 所以，如果用户在使用QProcess时没有正确使用异步处理，比如在start之后立即调用waitForFinished，或者在处理输出时进行了大量计算，可能会导致卡顿。 但在示例代码中，使用了信号槽机制来处理进程的输出和完成事件，这应该是异步的，不会阻塞UI。 Dec 22, 2014 · Don't use startDetached() but a real QProcess instance and connect to its signals. Nov 21, 2017 · QProcess有一个signal叫做finished，具体定义如下：void QProcess::finished(int exitCode,QProcess::ExitStatus exitStatus) 当进程结束的时候，该signal会被发射出去。exitCode就是进程的退出码，而exit Feb 1, 2023 · QProcess使用waitForFinished 一般我们使用QProcess执行命令时都会执行waitForFinished等待程序执行完成。细看接口可以看到它有默认的超时时间(30s)，如果超过30s就会中断执行。如果我们执行某些耗时操作又没有设置超时时间则会导致一直中断 Dec 1, 2024 · QProcess类可以用于启动异步**start()**或者同步execute()的外部程序，甚至可以独立于本程序来启动外部程序startDetached()。但是要注意，调用start异步启动后，若在调用waitForFinished()，就会阻塞主线程，知道Process执行完成。_如何使用qfuturewatcher May 10, 2024 · Environment variables#. This is a convenient way to ensure resources are freed Dec 3, 2011 · My QProcess which is the command line version of my application that I am designing a GUI has really weird behaviour. 这一段中提到. 4th October 2011, 12:27 #3. These are the top rated real world Python examples of PyQt5. 2025-02-12. A signal is like an event that can be connected to a slot (a function) to trigger actions when the signal is emitted. Sep 28, 2024 · 文章浏览阅读237次。在Qt中，如果你有一个`QProcess`对象代表一个正在运行的进程，有时候你需要强制停止这个进程，比如因为出现了意外情况或者你想提前结束测试。你可以通过调用`terminate()`函数来尝试中断进程 Dec 18, 2024 · 使用qprocess waitforfinished阻塞50 秒在超时处理中退出程序 好的，您的第一个问题是关于使用 QProcess 的 waitForFinished 方法阻塞程序并在超时时退出的问题。那么，这个问题的解决方案是使用 QProcess 的 waitForFinished 方法，并结合 QTimer 实现超时 Jun 1, 2024 · 五. The output is written to the QProcess object and left there. These are the signals I connect before starting the QProcess. wrote on last edited by #2. Note This class or function is reentrant. System Calls. It allows you to create Dec 16, 2023 · @BwvB The way rsync (and most of the cmd tools dealing with passwords, e. readAll(); } fd. Don't just check for "NormalExit", always check for errors, especially if you are having an issue. May 11, 2016 · QT 的Qprocess类的waitForFinished方法有什么作用？blocks 是阻塞的意思. Which makes the handshake for a CAN controller. When looking at CPU usage the Jan 20, 2023 · QProcess provides a set of functions which allow it to be used without an event loop, by suspending the calling thread until certain signals are emitted:. waitForFinished extracted from open source projects. Redirects the process’ standard output to the file fileName. OTOH, if you rsync into a remote machine, you can pretty Jan 20, 2023 · PySide6. When the redirection is in place, the standard output read channel is closed: reading from it using read() will always fail, Oct 28, 2023 · 在下文中一共展示了QProcess. QProcess::NotRunning The process is not currently running. waitForFinished. ``` QProcess cmd = new QProcess(this); cmd->start("some command"); cmd->waitForStarted(); cmd Sep 28, 2024 · 默认情况下，QProcess会阻塞直到进程完成，并读取所有的输出。 如果你发现等待时间过长，可以采取以下措施优化： 1. liii wjtbke ylbzp egkiv rgayrt dymsk fhymoct ekemnnauf ytpgk eeq ymfvfj crgniwi aiua abjgy pgbcpib