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#!/usr/bin/env python
"""PyQt4 port of the network/http example from Qt v4.x"""
import sys
from PyQt4 import QtCore, QtGui, QtNetwork
class HttpWindow(QtGui.QDialog):
def __init__(self, parent=None):
QtGui.QDialog.__init__(self, parent)
self.urlLineEdit = QtGui.QLineEdit("http://www.ietf.org/iesg/1rfc_index.txt")
self.urlLabel = QtGui.QLabel(self.tr("&URL:"))
self.urlLabel.setBuddy(self.urlLineEdit)
self.statusLabel = QtGui.QLabel(self.tr("Please enter the URL of a file "
"you want to download."))
self.quitButton = QtGui.QPushButton(self.tr("Quit"))
self.downloadButton = QtGui.QPushButton(self.tr("Download"))
self.downloadButton.setDefault(True)
self.progressDialog = QtGui.QProgressDialog(self)
self.http = QtNetwork.QHttp(self)
self.outFile = None
self.httpGetId = 0
self.httpRequestAborted = False
self.connect(self.urlLineEdit, QtCore.SIGNAL("textChanged(QString &)"),
self.enableDownloadButton)
self.connect(self.http, QtCore.SIGNAL("requestFinished(int, bool)"),
self.httpRequestFinished)
self.connect(self.http, QtCore.SIGNAL("dataReadProgress(int, int)"),
self.updateDataReadProgress)
self.connect(self.http, QtCore.SIGNAL("responseHeaderReceived(QHttpResponseHeader &)"),
self.readResponseHeader)
self.connect(self.progressDialog, QtCore.SIGNAL("canceled()"),
self.cancelDownload)
self.connect(self.downloadButton, QtCore.SIGNAL("clicked()"),
self.downloadFile)
self.connect(self.quitButton, QtCore.SIGNAL("clicked()"),
self, QtCore.SLOT("close()"))
topLayout = QtGui.QHBoxLayout()
topLayout.addWidget(self.urlLabel)
topLayout.addWidget(self.urlLineEdit)
buttonLayout = QtGui.QHBoxLayout()
buttonLayout.addStretch(1)
buttonLayout.addWidget(self.downloadButton)
buttonLayout.addWidget(self.quitButton)
mainLayout = QtGui.QVBoxLayout()
mainLayout.addLayout(topLayout)
mainLayout.addWidget(self.statusLabel)
mainLayout.addLayout(buttonLayout)
self.setLayout(mainLayout)
self.setWindowTitle(self.tr("HTTP"))
self.urlLineEdit.setFocus()
def downloadFile(self):
url = QtCore.QUrl(self.urlLineEdit.text())
fileInfo = QtCore.QFileInfo(url.path())
fileName = QtCore.QString(fileInfo.fileName())
if QtCore.QFile.exists(fileName):
QtGui.QMessageBox.information(self, self.tr("HTTP"), self.tr(
"There already exists a file called %1 "
"in the current directory.").arg(fileName))
return
self.outFile = QtCore.QFile(fileName)
if not self.outFile.open(QtCore.QIODevice.WriteOnly):
QtGui.QMessageBox.information(self, self.tr("HTTP"),
self.tr("Unable to save the file %1: %2.")
.arg(fileName).arg(self.outFile.errorString()))
self.outFile = None
return
if url.port() != -1:
self.http.setHost(url.host(), url.port())
else:
self.http.setHost(url.host(), 80)
if not url.userName().isEmpty():
self.http.setUser(url.userName(), url.password())
self.httpRequestAborted = False
self.httpGetId = self.http.get(url.path(), self.outFile)
self.progressDialog.setWindowTitle(self.tr("HTTP"))
self.progressDialog.setLabelText(self.tr("Downloading %1.").arg(fileName))
self.downloadButton.setEnabled(False)
def cancelDownload(self):
self.statusLabel.setText(self.tr("Download canceled."))
self.httpRequestAborted = True
self.http.abort()
self.downloadButton.setEnabled(True)
def httpRequestFinished(self, requestId, error):
if self.httpRequestAborted:
if self.outFile is not None:
self.outFile.close()
self.outFile.remove()
self.outFile = None
self.progressDialog.hide()
return
if requestId != self.httpGetId:
return
self.progressDialog.hide()
self.outFile.close()
if error:
self.outFile.remove()
QtGui.QMessageBox.information(self, self.tr("HTTP"),
self.tr("Download failed: %1.")
.arg(self.http.errorString()))
else:
fileName = QtCore.QFileInfo(QtCore.QUrl(self.urlLineEdit.text()).path()).fileName()
self.statusLabel.setText(self.tr("Downloaded %1 to current directory.").arg(fileName))
self.downloadButton.setEnabled(True)
self.outFile = None
def readResponseHeader(self, responseHeader):
if responseHeader.statusCode() != 200:
QtGui.QMessageBox.information(self, self.tr("HTTP"),
self.tr("Download failed: %1.")
.arg(responseHeader.reasonPhrase()))
self.httpRequestAborted = True
self.progressDialog.hide()
self.http.abort()
return
def updateDataReadProgress(self, bytesRead, totalBytes):
if self.httpRequestAborted:
return
self.progressDialog.setMaximum(totalBytes)
self.progressDialog.setValue(bytesRead)
def enableDownloadButton(self):
self.downloadButton.setEnabled(not self.urlLineEdit.text().isEmpty())
if __name__ == '__main__':
app = QtGui.QApplication(sys.argv)
httpWin = HttpWindow()
sys.exit(httpWin.exec_())
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