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feat: QNetworkAccessmanager and QNetworkReply and QNetworkRequest

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提供网络协议的7层模型中的 中高层的网络协议：Http/FTP/SNMP等  ==>

QNetworkAccessmanager  协调网络操作类（处理网络的请求和回应）：负责发送网络请求，创建网络响应
QNetworkRequest        网络请求
QNetworkReply          网络请求的响应（提供finished()/readyRead()/downloadProgress()信号），监测网络响应的执行情况，执行相应的操作
This commit is contained in:
touwoyimuli 2019-12-09 00:09:36 +08:00
parent f087fffde3
commit f4cda11752
2 changed files with 2 additions and 110 deletions
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3
QtHttpEx/ExHttp.cpp
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@ -12,6 +12,8 @@ ExHttp::ExHttp(QWidget *parent) :
setWindowTitle("QNetworkAccessManager 网络管理使用 Http 协议下载"); setWindowTitle("QNetworkAccessManager 网络管理使用 Http 协议下载");
m_networkManager = new QNetworkAccessManager(this); m_networkManager = new QNetworkAccessManager(this);
m_reply = nullptr;
m_file = nullptr;
} }
ExHttp::~ExHttp() ExHttp::~ExHttp()
@ -65,7 +67,6 @@ void ExHttp::on_btnFile_clicked()
QDir dir(currPath); QDir dir(currPath);
dir.mkdir("temp"); dir.mkdir("temp");
ui->lineEditFile->setText(currPath + "/temp/"); ui->lineEditFile->setText(currPath + "/temp/");
} }

109
QtHttpEx/ExHttp.cpp.autosave
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@ -1,109 +0,0 @@
#include "ExHttp.h"
#include "ui_ExHttp.h"
#include <QMessageBox>
#include <QDir>
#include <QDesktopServices>
ExHttp::ExHttp(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::ExHttp)
{
ui->setupUi(this);
setWindowTitle("QNetworkAccessManager 网络管理使用 Http 协议下载");
m_networkManager = new QNetworkAccessManager(this);
m_reply = nullptr;
m_file = nullptr;
}
ExHttp::~ExHttp()
{
delete ui;
}
//下载文件
void ExHttp::on_btnDown_clicked()
{
QString urlSpec = ui->lineEditUrl->text().trimmed(); //去掉字符串的首尾的空格
if (urlSpec.isEmpty()) {
QMessageBox::information(this, "提示", "下载地址URL为NULL");
return;
}
QUrl url = QUrl::fromUserInput(urlSpec);
if (!url.isValid()) {
QMessageBox::information(this, "提示", QString("无效URL: %1 \n 错误信息: %2").arg(urlSpec, url.errorString()));
return;
}
QString dir = ui->lineEditFile->text().trimmed();
if (dir.isEmpty()) {
QMessageBox::information(this, "提示", "保存地址为空");
return;
}
QString fileFileName = dir + url.fileName(); //文件保存地址 + 文件名
if (QFile::exists(fileFileName))
QFile::remove(fileFileName);
m_file = new QFile(fileFileName); //创建临时文件
if (!m_file->open(QIODevice::WriteOnly)) {
QMessageBox::information(this, "提示", "打开临时文件错误");
return;
}
ui->btnDown->setEnabled(false);
m_reply = m_networkManager->get(QNetworkRequest(url)); //发送get网络请求，创建网络响应
connect(m_reply, SIGNAL(finished()), this, SLOT(onFinished()));
connect(m_reply, SIGNAL(readyRead()), this, SLOT(onReadyRead()));
connect(m_reply, SIGNAL(downloadProgress(qint64,qint64)), this, SLOT(onDownloadProgress(qint64,qint64)));
}
//默认的保存路径
void ExHttp::on_btnFile_clicked()
{
QString currPath = QDir::currentPath();
QDir dir(currPath);
dir.mkdir("temp");
ui->lineEditFile->setText(currPath + "/temp/");
}
//网络响应结束
void ExHttp::onFinished()
{
QFileInfo fileInfo;
fileInfo.setFile(m_file->fileName());
m_file->close();
delete m_file;
m_file = nullptr;
m_reply->deleteLater();
m_reply = nullptr;
if (ui->checkBox->isChecked()) //勾选了，下载完成之后，打开下载的文件 //absoluteFilePath() 返回包含文件名的绝对路径。
QDesktopServices::openUrl(QUrl::fromLocalFile(fileInfo.absoluteFilePath())); //使用默认软件的打开下载的文件
ui->btnDown->setEnabled(true);
}
//读取下载的数据
void ExHttp::onReadyRead()
{
m_file->write(m_reply->readAll()); //将返回的数据进行读取，写入到临时文件中
}
//下载进程
void ExHttp::onDownloadProgress(qint64 bytesRea, qint64 totalBytes)
{
ui->progressBar->setMaximum(totalBytes);
ui->progressBar->setValue(bytesRea);
}
void ExHttp::on_lineEditUrl_textChanged(const QString &arg1)
{
ui->progressBar->setMaximum(100);
ui->progressBar->setValue(0);
}