Qt Process Demo

本文深入讲解了Qt中进程管理的实现方式,包括如何通过QProcess类启动、控制和监听进程,以及如何处理进程的输出和错误。文章提供了关键的API说明和示例代码,帮助读者理解Qt进程操作的核心概念。

Qt上进程的使用.


Header:#include
qmake:QT += core

重要的接口:.


开启一个进程.

void start(const QString &program, const QStringList &arguments, QIODevice::OpenMode mode = ReadWrite)
void start(const QString &command, QIODevice::OpenMode mode = ReadWrite)
void start(QIODevice::OpenMode mode = ReadWrite)


等待进程结束并回收进程资源.

bool waitForFinished(int msecs = 30000)


结束进程.

void kill()


信号 Signals.

  
void errorOccurred(QProcess::ProcessError error)
void finished(int exitCode, QProcess::ExitStatus exitStatus)    //进程结束后会发送该信号
void readyReadStandardError()
void readyReadStandardOutput()
void started()
void stateChanged(QProcess::ProcessState newState)

用例

//新建一个QT进程
QProcess *myPro = new QProcess(this);

//用该进程去执行任务
myPro->start("对应的任务");


我的GITHUB


As an AI language model, I do not have the capability to provide a demo. However, I can explain how to create a simple Qt HTTP Web API demo. First, you need to include the necessary headers: ``` #include <QtNetwork/QNetworkAccessManager> #include <QtNetwork/QNetworkRequest> #include <QtNetwork/QNetworkReply> ``` Then, you can create a `QNetworkAccessManager` object to send HTTP requests: ``` QNetworkAccessManager *manager = new QNetworkAccessManager(this); ``` You can then use the `get()` method to send a GET request to a Web API: ``` QNetworkReply *reply = manager->get(QNetworkRequest(QUrl("https://jsonplaceholder.typicode.com/posts"))); connect(reply, &QNetworkReply::finished, [=]() { if (reply->error() == QNetworkReply::NoError) { QByteArray data = reply->readAll(); // process the data received from the Web API } else { // handle the error } reply->deleteLater(); }); ``` In the above example, the `QByteArray` `data` contains the response data received from the Web API. You can then process this data as needed. You can also use the `post()` method to send a POST request with data: ``` QNetworkRequest request(QUrl("https://jsonplaceholder.typicode.com/posts")); request.setHeader(QNetworkRequest::ContentTypeHeader, "application/json"); QJsonObject postData; postData["title"] = "foo"; postData["body"] = "bar"; postData["userId"] = 1; QJsonDocument doc(postData); QByteArray postDataBytes = doc.toJson(); QNetworkReply *reply = manager->post(request, postDataBytes); connect(reply, &QNetworkReply::finished, [=]() { if (reply->error() == QNetworkReply::NoError) { QByteArray data = reply->readAll(); // process the data received from the Web API } else { // handle the error } reply->deleteLater(); }); ``` In the above example, a JSON object is created and serialized to a `QByteArray`. This data is then sent in the body of the POST request. This is just a basic example of how to use Qt to interact with a Web API. There are many other features and options available in Qt that can be used to customize and optimize the communication with the Web API.
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