在Windows错误上使用QProcess启动进程:“计时器只能与以QThread开头的线程一起使用" [英] Start process with QProcess on windows error: "Timers can only be used with threads started with QThread"

问题描述

我有一个最小的例子，我正在努力工作.最终目标是能够将一些信息传达给正在等待"cin"调用的程序.我想这与标准输入有关.

I have a minimal example i am trying to get working. The end goal is to be able to communicate some information to a program that is waiting on a "cin" call. I guess that means something to do with Standard Input.

在此阶段，我正在尝试使用一些Qt对象来帮助我.尽管我没有使用任何其他Qt东西.

I am trying to use some Qt objects to help me at this stage. Although I am not using any other Qt stuff.

我正在尝试给我带来错误的示例是:

The example I am trying that gives me errors is:

#include <iostream>

#include <QtCore/QString>
#include <QtCore/QProcess>
#include <QtCore/QStringList>

int main() {

    QProcess process;
    QString prog = "test.exe";

    // Starting "test.exe":
    process.start(prog);
    bool started = process.waitForStarted();
    std::cout << started << std::endl;

    // test.exe is waiting for cin, so give "2":
    bool response = process.write("2\n");
    std::cout << response << std::endl;
}

以下是错误消息:

1
QObject::startTimer: Timers can only be used with threads started with QThread
1
QProcess: Destroyed while process ("test.exe") is still running.

推荐答案

在极少数情况下，您将拥有一个没有QApplication或QCoreApplication的Qt应用程序.它们启动事件循环，这是计时器，事件，信号/插槽所必需的.

In rare cases you will have a Qt-app without QApplication or QCoreApplication. They start event loop, required for timers, events, signals/slots.

控制台XML解析器可能是这种无事件的应用程序.

A console XML-parser could be such kind of event-less application.

例如这里是最小的QtCoreApplication应用程序:如何进行在C ++中创建一个简单的Qt控制台应用程序?

Take a look e.g. here for a minimal QtCoreApplication app: How do I create a simple Qt console application in C++?

在子类化的QWidget或QObject中启动您的过程.

Start your process within a subclassed QWidget or QObject.

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