Qt中使用QNetworkAccessManager类来实现Http相关请求,本文介绍Http Get请求的简单实用方法。
下面是Qt中进行Http请求的简单步骤:
- 定义QNetworkAccessManager指针及槽函数
- 创建QNetworkAccessManager对象并关联槽函数
- 在类的析构函数中删除QNetworkAccessManager对象
- 实现槽函数
- 调用Http请求
1、在头文件中定义QNetworkAccessManager指针及槽函数
private slots: void onNetworkReplyFinished(QNetworkReply *reply); private: QNetworkAccessManager *m_netAccessManager;
2、在构造函数中创建QNetworkAccessManager对象并关联信号槽
MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) , ui(new Ui::MainWindow) { ui->setupUi(this); m_netAccessManager = new QNetworkAccessManager(this); //关联信号槽 connect(m_netAccessManager, &QNetworkAccessManager::finished, this, &MainWindow::onNetworkReplyFinished); }
3、在析构函数中删除QNetworkAccessManager对象
MainWindow::~MainWindow() { delete ui; delete m_netAccessManager; }
4、实现槽函数
void MainWindow::onNetworkReplyFinished(QNetworkReply *reply) { //状态码:200表示请求成功 int statusCode = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt(); qDebug() << "operation: " << reply->operation(); //请求方式 qDebug() << "status code: " << statusCode; //状态码 qDebug() << "url: " << reply->url(); //url qDebug() << "raw header: " << reply->rawHeaderList(); //header if (statusCode != 200 || reply->error() != QNetworkReply::NoError) { qDebug() << "请求数据失败:" << reply->errorString().toLocal8Bit().data(); //error return; } //获取响应信息 QByteArray replyData = reply->readAll(); auto byteArray = QString(replyData).toLocal8Bit(); qDebug() << "read all: " << byteArray.data(); //释放内存 reply->deleteLater(); }
5、调用Get方法
QUrl url("the url"); m_netAccessManager->get(QNetworkRequest(url));标签:netAccessManager,Http,QNetworkAccessManager,url,reply,请求,MainWindow,Qt From: https://www.cnblogs.com/xhubobo/p/18534186