Question

How would you display a local html file using the Qt resource system? The obvious QtCore.QUrl.fromLocalFile(":/local_file.html") doesn’t seem to be the correct syntax.

File mainwindow.qrc (before compilation)

<qresource prefix="/">
    <file alias="html_home">webbrowser_html/program_index.html</file>

File ui_mainwindow:

class Ui_MainWindow(object):    
    def setupUi(self, MainWindow):
        #...
        self.WebBrowser = QtWebKit.QWebView(self.Frame3)

File webbrower.py

from ui_mainwindow import Ui_MainWindow
import mainwindow_rc

class MainWindow(QtGui.QMainWindow, Ui_MainWindow):
    def __init__(self):
        QtGui.QMainWindow.__init__(self)

        self.setupUi(self)
        #...
        stream = QtCore.QFile(':/webbrowser_html/program_index.html')
        if stream.open(QtCore.QFile.ReadOnly):
            home_html = QtCore.QString.fromUtf8(stream.readAll())
            self.WebBrowser.setHtml()
            stream.close()

Answer 1

QUrl requires a scheme, and for resources it is qrc://. Relevant part from the docs:

By default, resources are accessible in the application under the same
file name as they have in the source tree, with a :/ prefix, or by a
URL with a qrc scheme.

For example, the file path :/images/cut.png or the URL
qrc:///images/cut.png would give access to the cut.png file, whose
location in the application’s source tree is images/cut.png.

So, use this instead:

QtCore.QUrl("qrc:///local_file.html")

Edit

You are giving the file an alias (alias="html_home"):

<qresource prefix="/">
    <file alias="html_home">webbrowser_html/program_index.html</file>

Path is now :/html_home, not :/webbrowser_html/program_index.html

You should use:

QtCore.QUrl("qrc:///html_home")

Which would be in your case:

class MainWindow(QtGui.QMainWindow, Ui_MainWindow):
    def __init__(self):
        QtGui.QMainWindow.__init__(self)

        self.setupUi(self)
        #...
        self.WebBrowser.load(QtCore.QUrl('qrc:///html_home'))

(You should adjust the ekhumoro’s solution too, if you intend to use that. Also note that you are not setting the HTML of the page in your paste.)