QDesktopServices.openUrl fails to open local file on Ubuntu
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@JonB said in QDesktopServices.openUrl fails to open local file on Ubuntu:
Do you mean because of the "relative" start to the path in file:doc/..."?
No, it's simply no valid url since the schema must be
<name>://. -
@Christian-Ehrlicher
Oh, I didn't realize the//is a compulsory part of any schema!@JonB see e.g. here: https://doc.qt.io/qt-5/qurl.html#setAuthority -
://must be between the schema and the 'rest' :)Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
Visit the Qt Academy at https://academy.qt.io/catalog -
@JonB see e.g. here: https://doc.qt.io/qt-5/qurl.html#setAuthority -
://must be between the schema and the 'rest' :)@Christian-Ehrlicher
Yes, thank you. I am not sure I had ever particularly been struck by that, but I see now!So the obvious question might be: why did they need
//? there must be a reason. Why not just/? Why didn't the first people who defined this settle on<name>:/? -
@Christian-Ehrlicher
Yes, thank you. I am not sure I had ever particularly been struck by that, but I see now!So the obvious question might be: why did they need
//? there must be a reason. Why not just/? Why didn't the first people who defined this settle on<name>:/? -
@JoeCFD
My question is why didn't they go for, say,http:/andfile:/, instead of//, in the first place? Purely because I'm interested/wonder. -
@JonB sorry I misundestood your previous post. / is reserved for path.
check here https://en.wikipedia.org/wiki/URL out.@JoeCFD said in QDesktopServices.openUrl fails to open local file on Ubuntu:
/ is reserved for path.
Again, I know that, my question was why adopt double-slashes. Interestingly (to me) I have come across a BBC interview from 2009 with Tim Berners-Lee where it states:
The forward slashes at the beginning of internet addresses have long annoyed net users and now the man behind them has apologised for using them.
Sir Tim Berners-Lee, the creator of the World Wide Web, has confessed that the // in a web address were actually "unnecessary".
He told the Times newspaper that he could easily have designed URLs not to have the forward slashes.
So there you are --- the choice of
//was "annoying" and "unnecessary"! :) -
@efremdan1 use the fullpath:
import os.path CURRENT_DIRECTORY = os.path.dirname(os.path.realpath(__file__)) filename = os.path.join(CURRENT_DIRECTORY, "doc/_build/latex/xslide-user-manual.pdf") print(filename) url = QUrl.fromLocalFile(filename) if not QDesktopServices.openUrl(url): print("failed")@eyllanesc said in QDesktopServices.openUrl fails to open local file on Ubuntu:
@efremdan1 use the fullpath:
import os.pathCURRENT_DIRECTORY = os.path.dirname(os.path.realpath(file))
filename = os.path.join(CURRENT_DIRECTORY, "doc/_build/latex/xslide-user-manual.pdf")
print(filename)
url = QUrl.fromLocalFile(filename)
if not QDesktopServices.openUrl(url):
print("failed")This answer works too, but I marked @JoeCFD's as the correct answer since it doesn't look necessary to use the absolute directly. Just using
QDesktopServices.openUrl(QUrl.fromLocalFile("doc/_build/latex/xslide-user-manual.pdf"))works absolutely fine for me. And since it's a lot shorter and more readable, I don't see why not to use it. -
@eyllanesc said in QDesktopServices.openUrl fails to open local file on Ubuntu:
@efremdan1 use the fullpath:
import os.pathCURRENT_DIRECTORY = os.path.dirname(os.path.realpath(file))
filename = os.path.join(CURRENT_DIRECTORY, "doc/_build/latex/xslide-user-manual.pdf")
print(filename)
url = QUrl.fromLocalFile(filename)
if not QDesktopServices.openUrl(url):
print("failed")This answer works too, but I marked @JoeCFD's as the correct answer since it doesn't look necessary to use the absolute directly. Just using
QDesktopServices.openUrl(QUrl.fromLocalFile("doc/_build/latex/xslide-user-manual.pdf"))works absolutely fine for me. And since it's a lot shorter and more readable, I don't see why not to use it.@efremdan1 I don't recommend using relative paths as they will depend on where the "current location" is. In your case it seems that you are executing the script of the form:
python script.pybut if at another time you execute it aspython foo/script.pyit may fail. Relative paths are one of the most common causes of silent errors that are the worst at debugging. -
@eyllanesc said in QDesktopServices.openUrl fails to open local file on Ubuntu:
@efremdan1 use the fullpath:
import os.pathCURRENT_DIRECTORY = os.path.dirname(os.path.realpath(file))
filename = os.path.join(CURRENT_DIRECTORY, "doc/_build/latex/xslide-user-manual.pdf")
print(filename)
url = QUrl.fromLocalFile(filename)
if not QDesktopServices.openUrl(url):
print("failed")This answer works too, but I marked @JoeCFD's as the correct answer since it doesn't look necessary to use the absolute directly. Just using
QDesktopServices.openUrl(QUrl.fromLocalFile("doc/_build/latex/xslide-user-manual.pdf"))works absolutely fine for me. And since it's a lot shorter and more readable, I don't see why not to use it.@efremdan1 said in QDesktopServices.openUrl fails to open local file on Ubuntu:
QUrl.fromLocalFileUsing
QUrl.fromLocalFile(), instead of trying to type in the rightfile://stuff, is fine and good.However, passing a relative path to it, or specifying
file:://relative-path, is dangerous precisely as @eyllanesc has said. -
@eyllanesc said in QDesktopServices.openUrl fails to open local file on Ubuntu:
@efremdan1 use the fullpath:
import os.pathCURRENT_DIRECTORY = os.path.dirname(os.path.realpath(file))
filename = os.path.join(CURRENT_DIRECTORY, "doc/_build/latex/xslide-user-manual.pdf")
print(filename)
url = QUrl.fromLocalFile(filename)
if not QDesktopServices.openUrl(url):
print("failed")This answer works too, but I marked @JoeCFD's as the correct answer since it doesn't look necessary to use the absolute directly. Just using
QDesktopServices.openUrl(QUrl.fromLocalFile("doc/_build/latex/xslide-user-manual.pdf"))works absolutely fine for me. And since it's a lot shorter and more readable, I don't see why not to use it.@efremdan1 The other guys are right. I thought you might know this and therefore did not mention that in my post. Try to use absolute path as much as possible.
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@eyllanesc said in QDesktopServices.openUrl fails to open local file on Ubuntu:
@efremdan1 I don't recommend using relative paths as they will depend on where the "current location" is. In your case it seems that you are executing the script of the form: python script.py but if at another time you execute it as python foo/script.py it may fail. Relative paths are one of the most common causes of silent errors that are the worst at debugging.
You're indeed correct. Thank you.
