//downloadObject.h
#ifndef HTTPGET_H
#define HTTPGET_H
#include
#include
class QUrl;
class downloadObject : public QObject
{
Q_OBJECT
public:
QHttp * http;
downloadObject(QObject *parent = 0);
bool getFile(const QUrl &url,const qint64 totalSize);
void abort();
signals:
//void explains();
void downloadDone();
void updateProgressbar(int current, int all);
private slots:
void httpDone(bool error);
void updateProgress(int current,int all);
private:
QFile file;
QHttpResponseHeader *resp;
QString localFileName;
qint64 beforeSize;
qint64 totalSize;
};
#endif
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//downloadObject.cpp
#include
#include
#include
#include "stdio.h"
#include "stdlib.h"
#include "time.h"
#include "downloadObject.h"
downloadObject::downloadObject(QObject *parent)
: QObject(parent)
{
http = new QHttp(this);
connect(http, SIGNAL(done(bool)), this, SLOT(httpDone(bool)));
connect(http, SIGNAL(dataReadProgress(int,int)),this, SLOT(updateProgress(int,int)));
}
bool downloadObject::getFile(const QUrl &url,const qint64 totalSizet)
{
if (!url.isValid()) {
std::cerr << "Error: Invalid URL" << std::endl;
return false;
}
if (url.scheme() != "http") {
std::cerr << "Error: URL must start with 'http:'" << std::endl;
return false;
}
if (url.path().isEmpty()) {
std::cerr << "Error: URL has no path" << std::endl;
return false;
}
localFileName = QFileInfo(url.path()).fileName();
if (localFileName.isEmpty())
localFileName = "httpget.out";
file.setFileName(localFileName);
qint64 dwSize = 0;
totalSize = totalSizet;
if(file.exists())
{
dwSize = file.size();
beforeSize = dwSize;
}
if (!file.open(QIODevice::Append)) {
std::cerr << "Error: Cannot write file "
<< qPrintable(file.fileName()) << ": "
<< qPrintable(file.errorString()) << std::endl;
return false;
}
QHttp::ConnectionMode mode = url.scheme().toLower() == "https" ? QHttp::ConnectionModeHttps : QHttp::ConnectionModeHttp;
http->setHost(url.host(), mode, url.port() == -1 ? 0 : url.port());
QHttpRequestHeader *header = new QHttpRequestHeader("GET", url.path());
header->setValue("Connection", "Keep-Alive");
QString str = "bytes=";
QString strTemp = QString("%1").arg(dwSize);
str+=strTemp;
if (dwSize>totalSize)
{
dwSize = totalSize;
}
str+="-";
strTemp = QString("%1").arg(totalSize);
str += strTemp;
header->setValue("Range", str);
strTemp = url.host()+":80";
header->setValue("Host", strTemp);
//
http->request(*header, 0, &file);
http->close();
return true;
}
void downloadObject::abort()
{
http->abort();
file.close();
}
void downloadObject::httpDone(bool error)
{
if (error) {
QString sre = http->errorString();
std::cerr << "Error: " << qPrintable(http->errorString())
<< std::endl;
} else {
std::cerr << "File downloaded as "
<< qPrintable(file.fileName()) << std::endl;
}
file.close();
emit downloadDone();
}
void downloadObject::updateProgress(int current, int all)
{
if(current<0)
{
current = 0;
}
if(beforeSize<0)
{
beforeSize = 0;
}
current = beforeSize+current;
emit updateProgressbar(current, totalSize);
}
////////////////////////////////////////////////////////////////////////////////////////////////////////
//qtdownloaddemo.h
#ifndef QTDOWNLOADDEMO_H
#define QTDOWNLOADDEMO_H
#include
#include "ui_qtdownloaddemo.h"
#include "downloadObject.h"
class QtDownloadDemo : public QDialog
{
Q_OBJECT
public:
QtDownloadDemo(QWidget *parent = 0, Qt::WFlags flags = 0);
~QtDownloadDemo();
private slots:
void Download();
void Done();
void Stop();
void updateDataReadProgress(int bytesRead,int totalbytes);
private:
Ui::QtDownloadDemoClass ui;
downloadObject *downloadobject;
qint64 totalSize;
};
#endif // QTDOWNLOADDEMO_H
////////////////////////////////////////////////////////////////////////////////////////////////////
//qtdownloaddemo.cpp
#include "qtdownloaddemo.h"
#include
#include
QtDownloadDemo::QtDownloadDemo(QWidget *parent, Qt::WFlags flags)
: QDialog(parent, flags)
{
ui.setupUi(this);
downloadobject = new downloadObject(this);
connect(downloadobject, SIGNAL(downloadDone()), this, SLOT(Done()));
connect(downloadobject, SIGNAL(updateProgressbar(int,int)), this, SLOT(updateDataReadProgress(int,int)));
}
QtDownloadDemo::~QtDownloadDemo()
{
}
void QtDownloadDemo::Stop()
{
downloadobject->abort();
}
void QtDownloadDemo::Download()
{
bool ok;
QString strUrl = ui.lineEdit->text();
totalSize = ui.lineEdit_2->text().toLongLong(&ok, 10);
QUrl url(strUrl);
downloadobject->getFile(url,totalSize);
}
void QtDownloadDemo::Done()
{
QString str = "download complete";
QMessageBox::warning(this,"Message",str);
}
void QtDownloadDemo::updateDataReadProgress(int bytesRead,int totalbytes)
{
ui.progressBar->setMaximum(totalSize);
ui.progressBar->setValue(bytesRead);
}