Develop Reference

how can i show PDF file as Bytes using QWebEngineView in PyQt5? [duplicate]

So, using PyQt5's QWebEngineView and the .setHTML and .setContent methods have a 2 MB size limitation. When googling for solutions around this, I found two methods:
Use SimpleHTTPServer to serve the file. This however gets nuked by a firewall employed in the company.
Use File Urls and point to local files. This however is a rather bad solution, as the HTML contains confidential data and I can't leave it on the harddrive, under any circumstance.
The best solution I currently see is to use file urls, and get rid of the file on program exit/when loadCompleted reports it is done, whichever comes first.
This is however not a great solution and I wanted to ask if there is a solution I'm overlooking that would be better?

Why don't you load/link most of the content through a custom url scheme handler?
webEngineView->page()->profile()->installUrlSchemeHandler("app", new UrlSchemeHandler(e));
class UrlSchemeHandler : public QWebEngineUrlSchemeHandler
{ Q_OBJECT
public:
void requestStarted(QWebEngineUrlRequestJob *request) {
QUrl url = request->requestUrl();
QString filePath = url.path().mid(1);
// get the data for this url
QByteArray data = ..
//
if (!data.isEmpty())
{
QMimeDatabase db;
QString contentType = db.mimeTypeForFileNameAndData(filePath,data).name();
QBuffer *buffer = new QBuffer();
buffer->open(QIODevice::WriteOnly);
buffer->write(data);
buffer->close();
connect(request, SIGNAL(destroyed()), buffer, SLOT(deleteLater()));
request->reply(contentType.toUtf8(), buffer);
} else {
request->fail(QWebEngineUrlRequestJob::UrlNotFound);
}
}
};
you can then load a website by webEngineView->load(new QUrl("app://start.html"));
All relative pathes from inside will also be forwarded to your UrlSchemeHandler..
And rember to add the respective includes
#include <QWebEngineUrlRequestJob>
#include <QWebEngineUrlSchemeHandler>
#include <QBuffer>

One way you can go around this is to use requests and QWebEnginePage's method runJavaScript:
web_engine = QWebEngineView()
web_page = web_engine.page()
web_page.setHtml('')
url = 'https://youtube.com'
page_content = requests.get(url).text
# document.write writes a string of text to a document stream
# https://developer.mozilla.org/en-US/docs/Web/API/Document/write
# And backtick symbol(``) is for multiline strings
web_page.runJavaScript('document.write(`{}`);'.format(page_content))

using selenium with python to handle confirmation alerts when they appear

I am using selenium with python for the website automation,and that includes navigation and file downloads.If the page is idle for around 15 mins(roughly,not exact),confirmation pop up appears warning the session timeout and it asks to click "OK" to continue.
I know I can use the following code to deal with the confirmation pop up
driver.switch_to.alert.accept()
But how can I click "OK"in the confirmation popup whenever it appears?Do I have hto keep checking every 30 seconds if the confirmation popup exists?

It looks like someone here had a similar question as you: How to check if an alert exists using WebDriver?
If you run driver.switch_to.alert when there is no alert actually present, you will receive a NoAlertPresentException. So, the basic idea is to write a method with a try / catch block that attempts driver.switch_to.alert, and returns true or false based on the presence of an exception.
Here's an example:
public boolean doesAlertExist()
{
try
{
driver.switch_to.alert();
return true;
}
catch (NoAlertPresentException e)
{
return false;
}
}
As far as your timing issue goes (alert pops up every 15ish minutes or so) -- you can try to write a wrapper method for driver.findElement() and element.click() that checks for the presence of the alert implicitly. Specific details about the method will depend on the project, but here's an example of something simple:
public IWebElement findElementWrapped(By by)
{
if (doesAlertExist())
{
driver.switch_to.alert().accept(); // accept the alert
return driver.findElement(by); // use selenium's standard findElement
}
else
{
// no alert exists, just find the element
return driver.findElement(by);
}
}
With this code, you can check for the alert every time you try to find an element on the page, but you only have to write the line of code once. You can use this method in action like this:
// check for alert, accept alert if it exists, get the desired web element
IWebElement myElement = driver.findElementWrapped(by);

Using PyperClip on web app

I am using pyperclip.py to grab a list of E-Mail Addresses in my web app using a form so a user can paste it locally via clipboard. It works perfect locally. However, while running it on a server (Linux 14.04 with Apache2) and accessed from a client system through the browser it doesn't copy. How can I get it to copy to the clipboard of the client's system?
Right now I'm just trying to get it to work and as such I'm only using a single line. I'm using pyperclip 1.5.15 with xclip and Python 3.4. The server is running Linux 14.04 and the client has noticed issues on Windows 8 and Windows 10 using Google Chrome and IE. No other os has currently been tested.
pyperclip.copy("HELLO")

Since I couldn't find many details on this subject I thought I'd answer my question. Unfortunately, it doesn't appear that browsers will support pyperclip so an HTML + Javascript work around is required (meaning on pyperclip). First, add your Django Template var as an HTML attribute from there you can use Javascript to handle the copy functionality. Below is an example of how to do this, sorry in advance because stackoverflow was giving some weird formatting to the example. It also assumes you have a form below with the id of email_list_clipboard. I hope this helps anyone else who may of run into a similar issue!
Example:
<html email-list="{{request.session.email_list}}">
<script>
$(document).ready(function () {
function copyTextToClipboard(text) {
var textArea = document.createElement("textarea");
// Place in top-left corner of screen regardless of scroll position.
textArea.style.position = 'fixed';
textArea.style.top = 0;
textArea.style.left = 0;
textArea.style.width = '2em';
textArea.style.height = '2em';
// We don't need padding, reducing the size if it does flash render.
textArea.style.padding = 0;
textArea.style.border = 'none';
textArea.style.outline = 'none';
textArea.style.boxShadow = 'none';
textArea.style.background = 'transparent';
textArea.value = text;
document.body.appendChild(textArea);
textArea.select();
try {
var successful = document.execCommand('copy');
var msg = successful ? 'successful' : 'unsuccessful';
console.log('Copying text command was ' + msg);
} catch (err) {
console.log('Oops, unable to copy');
}
document.body.removeChild(textArea);
}
// set things up so my function will be called when field_three changes
$('#email_list_clipboard').click(function (click) {
event.preventDefault();
copyTextToClipboard(document.documentElement.getAttribute("email-list"));
});
</script>

Mask Password in Input Box in Jython

I'm using Jython and trying to get the user to input a password. However, I would like it to show an asterisk rather than the characters that the user is inputting. I managed to do something similar using getpass, but it required you to type into the cmd line, and it would just not show anything rather than an asterisk.
I'm looking to have the user type into a dialog box; the "input()" command brings up a box that would be perfect. For example, this:
import sys
password = input("Please enter your password: ")
if password == None: #if the user hits cancel
sys.exit(0)
However, it does not mask the text. I am able to do this using the java aspect of jython like so:
import javax.swing.JOptionPane as JOP
import javax.swing.JPasswordField as JPF
import sys
pwdF = JPF()
choice = JOP.showConfirmDialog(None, pwdF,
"Please enter your password:",
JOP.OK_CANCEL_OPTION)
if choice == JOP.CANCEL_OPTION:
sys.exit(0)
password = pwdF.getText()
A problem I have with this is that I can't get the cursor to default to the text field (instead it starts on the ok button). Primarily, though, I'd like a more pythonic way of doing this.
I messed around quite a bit with java.swing, using layout and add components; however, I didn't understand it enough to tweak it in a way that would work.
Does anyone know a method of creating an input box with masked text different from the java version I posted?
Thanks.

You can use javax.swing.JPasswordField class.
An example is this :
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
public class PwdForm extends JFrame {
public JFrame frame;
public PwdForm() {
//Create main Panel
JPanel mainPanel = new JPanel();
//Password field
JLabel lblPwd = new JLabel("Password :");
mainPanel.add(lblPwd);
final JPasswordField txtPwd = new JPasswordField(20);
lblPwd.setLabelFor(txtPwd);
mainPanel.add(txtPwd);
//Confirm Button
final JButton btnOk = new JButton("Confirm");
mainPanel.add(btnOk);
//Create and set up the window.
frame = new JFrame("Password Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Set up the content pane.
mainPanel.setOpaque(true); //content panes must be opaque
frame.setContentPane(mainPanel);
//Display the window.
frame.pack();
frame.setResizable(false);
frame.setVisible(true);
}
public static void main(String[] args) {
PwdForm lf = new PwdForm();
}
}

how can i pass xml format data from flex to python

i want to pass xml format data into python from flex.i know how to pass from flex but my question is how can i get the passed data in python and then the data should be inserted into mysql.and aslo i want to retrieve the mysql data to the python(cgi),the python should convert all the data into xml format,and pass all the data to the flex..
Thank's in advance.....

See http://www.artima.com/weblogs/viewpost.jsp?thread=208528 for more details, here is a breif overview of what I think you are looking for.
The SimpleXMLRPCServer library allows you to easily create a server. Here's about the simplest server you can create, which provides two services to manipulate strings:
import sys
from random import shuffle
from SimpleXMLRPCServer import SimpleXMLRPCServer
class MyFuncs:
def reverse(self, str) :
x = list(str);
x.reverse();
return ''.join(x);
def scramble(self, str):
x = list(str);
shuffle(x);
return ''.join(x);
server = SimpleXMLRPCServer(("localhost", 8000))
server.register_instance(MyFuncs())
server.serve_forever()
Once you make a connection to the server, that server acts like a local object. You call the server's methods just like they're ordinary methods of that object.
This is about as clean an RPC implementation as you can hope for (and other Python RPC libraries exist; for example, CORBA clients). But it's all text based; not very satisfying when trying to create polished applications with nice GUIs. What we'd like is the best of all worlds -- Python (or your favorite language) doing the heavy lifting under the covers, and Flex creating the user experience.
To use the library, download it and unpack it somewhere. The package includes all the source code and the compiled as3-rpclib.swc library -- the .swc extension indicates an archive file, and pieces of this library can be pulled out and incorporated into your final .swf. To include the library in your project, you must tell Flexbuilder (you can get a free trial or just use the free command-line tools, and add on the Apollo portion) where the library is located by going to Project|Properties and selecting "Apollo Build Path," then choosing the "Library path" tab and pressing the "Add SWC..." button. Next, you add the namespace ak33m to your project as seen in the code below, and you're ready to create an XMLRPCObject.
Note: the only reason I used Apollo here was that I was thinking in terms of desktop applications with nice UIs. You can just as easily make it a Flex app.
Here's the entire Apollo application as a single MXML file, which I'll explain in detail:
<?xml version="1.0" encoding="utf-8"?>
<mx:ApolloApplication xmlns:mx="http://www.adobe.com/2006/mxml"
xmlns:ak33m="http://ak33m.com/mxml" layout="absolute">
<mx:Form>
<mx:FormHeading label="String Modifier"/>
<mx:FormItem label="Input String">
<mx:TextInput id="instring" change="manipulate()"/>
</mx:FormItem>
<mx:FormItem label="Reversed">
<mx:Text id="reversed"/>
</mx:FormItem>
<mx:FormItem label="Scrambled">
<mx:Text id="scrambled"/>
</mx:FormItem>
</mx:Form>
<ak33m:XMLRPCObject id="server" endpoint="http://localhost:8000"/>
<mx:Script>
<![CDATA[
import mx.rpc.events.ResultEvent;
import mx.rpc.events.FaultEvent;
import mx.rpc.AsyncToken;
import mx.controls.Alert;
import mx.collections.ItemResponder;
private function manipulate() : void {
server.reverse(instring.text).addResponder(new ItemResponder(reverseResult, onFault));
server.scramble(instring.text).addResponder(new ItemResponder(scrambleResult, onFault));
}
private function reverseResult(event : ResultEvent, token : AsyncToken = null) : void {
reversed.text = event.result.toString();
}
private function scrambleResult(event : ResultEvent, token : AsyncToken = null) : void {
scrambled.text = event.result.toString();
}
private function onFault (event : FaultEvent, token : AsyncToken = null) : void {
Alert.show(event.fault.faultString, event.fault.faultCode);
}
]]>
</mx:Script>
</mx:ApolloApplication>