After following tutorials on how to correctly install firebase into unity for an authentication system, I encountered an error that was:
Unable to find command line tool C:\The E-Learning System\Assets\Firebase\Editor\generate_xml_from_google_services_json.py required for Firebase Android resource generation.
From understnading it can not find either the google services file I imported into the assets folder or it could not find the generate_xml_from_google_services_json.py file. I looked online for people with similar problems could not find a clear answer to fix this.
This is a tool that ships with the SDK to support debugging your game in the Unity Editor. One minor caveat is that an exe actually ships on Windows (I assume that this is your operating system from the C:/). You should make sure that generate_xml_from_google_services_json.exe exists in that same directory (.exe's are typically ignored in many standard .gitignore as a catchall for build files). If it's missing, you can simply re-add the Firebase SDK and double check that this file gets included in your source repository.
If both generate_xml_from_google_services_json.py and generate_xml_from_google_services_json.exe exist under Assets/Firebase/Editor, you may also want to install Python for Windows (especially if you're still running Windows 7 or 8). This is due to a recent patch (as of 6.10.0) that fixes some incompatibilities with generate_xml_from_google_services_json.exe and older Windows variants. If that doesn't help, it would be awesome if you could file an issue or reach out to support directly. If there's a bug in that fallback, it would be helpful to surface that ASAP.
Let me know if that helps!
--Patrick
I am currently tasked with porting an code library over to .NetCore. Fundamentally, this is going fairly smoothly but there is one thing that is causing me concern and that is retaining platform independence.
Core is designed to run on Mac and Linux so I want to ensure that the library will also run on Mac and Linux when I'm done. However, in order to get things working I find myself including a lot of non Microsoft.AspNetCore.* nuget packages. (e.g. System.Diagnostics.Process, System.Net.Http, System.Threading.Thread, etc)
Clearly this won't be a problem on Windows but I do wonder if it would cause problems if say, someone targeting Linux was to include a reference to my library?
If it's not a problem then great but if it is then how do I know which nuget packages will be okay in a multi-platform library? (e.g. Is it only the AspNetCore ones that will work cross-platform?)
The System.* packages are (usually) from https://github.com/dotnet/corefx, and the 99.5% use cases are going to work on macOS and (supported) Linux (distributions) the same as they do on Windows.
There are cases where the System.* packages don't work the way you'd expect them to. Mainly this comes from times that .NET was adding convenience APIs to wrap Windows behavior. So reading a registry key, for example, won't work (and even in a future where the registry API works, it certainly won't be backed by a legitimate hive, so reading obscure values will report key not found). Mostly when an API isn't going to work on Linux/macOS it'll throw a PlatformNotSupportedException, instead of producing some sort of unexpected/wrong result.
So, as long as what you're doing doesn't feel specifically "Windows-y", everything from a netstandard* or netcoreapp* RID should Just Work. And if it doesn't, you can always file an issue at the corefx github project.
I don't trust the native Sqlite3 in MonoTouch anymore. I keep getting random crashes and although I cannot prove it, I claim that it is not my fault.
To verify this I would like to use a managed replacement of Sqlite3.
Is there a project that is syntax compatible with the native version? And more important: does somebody have experience with it?
Look at the Xamarin cross-platform MWC sample.
While it use the native libsqlite on iOS and Android versions it does use a fully managed port of SQLite for the Windows phone version (where SQLite is not available and where it's not possible to add native code).
However that won't tell you what's wrong with your application. If you're using other native libraries in your project I suggest you to remove them (one by one) and try to duplicate the sqlite crash again.
When I use Subversion in Cygwin to update some repository, some directories update with success, while some other one gets a failure with the error message:
svn: E200030: sqlite: disk I/O error
When doing svn update again for the same repository, a different directory can get the same error. Sometimes, there is a SVN instruction after the above error message.
This happened due to a change someone wanted in Cygwin's SQLite package. I was the maintainer of that package when this question was asked, and I made the change that caused this symptom.
The change was released as Cygwin SQLite version 3.7.12.1-1, and it fixed that one person's problem, but it had this bad side effect of preventing Cygwin's Subversion package from cooperating with native Windows Subversion implementations.
What Happened?
The core issue here is that Subversion 1.7 changed the working copy on-disk format. Part of that change involves a new SQLite database file, .svn/wc.db. Now, in order to implement SQLite's concurrency guarantees, SQLite locks the database file while it is accessing it.
That's all fine and sensible, but you run into a problem when you try to mix Windows native and POSIX file locking semantics. On Windows, file locking almost always means mandatory locking, but on Linux systems — which Cygwin is trying to emulate — locking usually means advisory locking instead.
That helps understand where the "disk I/O error" comes from.
The Cygwin SQLite 3.7.12.1-1 change was to build the library in "Unix mode" instead of "Cygwin mode." In Cygwin mode, the library uses Windows native file locking, which goes against the philosophy of Cygwin: where possible, Cygwin packages call POSIX functions instead of direct to the Windows API, so that cygwin1.dll can provide the proper POSIX semantics.
POSIX advisory file locking is exactly what you want with SQLite when all the programs accessing the SQLite DBs in question are built with Cygwin, which is the default assumption within Cygwin. But, when you run a Windows native Subversion program like TortoiseSVN alongside a pure POSIX Cygwin svn, you get a conflict. When the TortoiseSVN Windows Explorer shell extension has the .svn/wc.db file locked with a mandatory lock and Cygwin svn comes along and tries an advisory lock on it, it fails immediately. Cygwin svn assumes a lock attempt will either succeed immediately or block until it can succeed, so it incorrectly interprets the lock failure as a disk I/O error.
How Did We Solve This Dilemma?
Within Cygwin, we always try to play nice with Windows native programs where possible. The trick was to find a way to do that, while still playing nice with Cygwin programs, too.
Not everyone agreed that we should attempt this. "Cygwin SQLite is part of Cygwin, so it only needs to work well with other Cygwin programs," one group would say. The counterpartisans would reply, "Cygwin runs on Windows, so it has to perform well with other Windows programs."
Fortunately, we came up with a way to make both groups happy.
As part of the Cygwin SQLite 3.7.17-x packaging effort, I tested a new feature that Corinna Vinschen added to cygwin1.dll version 1.7.19. It allowed a program to request mandatory file locking through the BSD file locking APIs. My part of the change was to make Cygwin SQLite turn this feature on and off at the user's direction, allowing the same package to meet the needs of both the Cygwin-centric and Windows-native camps.
This Cygwin DLL feature was further improved in 1.7.20, and I released Cygwin SQLite 3.7.13-3 using the finalized locking semantics. This version allowed a choice of three locking strategies: POSIX advisory locking, BSD advisory locking, and BSD/Cygwin mandatory locking. So far, the latter strategy has proven to be completely compatible with native Windows locking.
Later, when Jan Nijtmans took over maintenance of Cygwin SQLite, he further enhanced this mechanism by fully integrating it with the SQLite VFS layer. This allowed a fourth option: the native Windows locking that Cygwin SQLite used to use before we started on this journey. This is mostly a hedge against the possibility that the BSD/Windows locking strategy doesn't cooperate cleanly with a native Windows SQLite program. So far as I know, no one has ever needed to use this option, but it's nice to know it's there.
Alternate Remedy
If the conflict you're having is between Cygwin's command line svn and the TortoiseSVN Windows Explorer shell extension, there's another option to fix it. TortoiseSVN ships with native Windows Subversion command-line programs as well. If you put these in your PATH ahead of Cygwin's bin directory, you shouldn't run into this problem at all.
Having encountered the same problem, it appears (in my case at least) to be an interaction with TortoiseSVN. Disabling TortoiseSVN's status icon cache (Settings > Icon Overlays > Status cache "None" > Apply) has everything working just fine for me.
(That obviously doesn't resolve the underlying problem, which appears to be due to the SQL package that Cygwin's Subversion package relies on changing its mode of access. As I write, there's active [if slow] discussion on the Cygwin mailing list about how to resolve this.)
ldd /usr/bin/svn shows that SVN depends on /usr/bin/cygsqlite3-0.dll.
After I change libsqlite3 from 3.7.12 back to 3.7.3, the problem seems to go away. So this may be a SQLite library problem.
Using TortoiseSVN, ticking off Refresh shell overlays at clean up solved the problem for me.
For others reference, I just had this same error (svn: E200030: sqlite: disk I/O error) and found that one of my log files was taking up all my space (and could not write to the HDD because there was no free space).
Run (to make sure you have enough disk space)
df -h
(If you don't delete some large files (I just removed some backup and log files)
Then I just needed to run:
svn cleanup
This resolved the error for me.
I love applications that are able to update themselves without any effort from the user (think: Sparkle framework for Mac). Is there any code/library I can leverage to do this in a Qt application, without having to worry about the OS details?
At least for Windows, Mac and user-owned Linux binaries.
I could integrate Sparkle on the Mac version, code something for the Linux case (only for a standalone, user-owned binary; I won't mess with distribution packaging, if my program is ever packaged), and find someone to help me on the Windows side, but that's horribly painful.
It is not a complete solution, but a cross-platform (Windows, Mac, Linux) tool for creating packages for auto-updates and installing them is available at https://github.com/mendeley/Update-Installer. This tool does not deal with publishing updates or downloading them.
This was written for use with a Qt-based application but to make the update installer small, standalone and easy to build, the installer uses only standard system libraries (C++ runtime, pthreads/libz/libbz2 on Linux/Mac, Win32 API on Windows, Cocoa on Mac, GTK with fallback on Linux). This simplifies delivering updates which include new versions of Qt and other non-system libraries that your application may depend on.
Before considering this though, I would suggest:
If you are only building for two platforms, consider using standard and well-tested auto-update frameworks for those platforms - eg. Sparkle on Mac, Google's Omaha on Windows or auto-update systems built into popular install frameworks (eg. InstallShield). I haven't tried BitRock.
On Mac, the Mac App Store may be a good option. See https://bugreports.qt.io/browse/QTBUG-16549 though.
On Linux, consider creating a .deb package and a simple repository to host it. Once users have a repository set up, the system-wide software update tools will take care of checking for and installing new releases. The steps for setting up a new repository however are too complex for many new Ubuntu/Debian users. What we did, and also what Dropbox and Google have done, is to create a .deb package which sets up the repository as part of the package installation.
A few other notes on creating an updater:
On Windows Vista/7, if the application is installed system-wide (eg. in C:\Program Files\$APPNAME) your users will see a scary UAC prompt when the updater tries to obtain permissions to write to the install directory. This can be avoided either by installing to a user-writable directory (I gather that this is what Google Chrome does) or by obtaining an Authenticode certificate and using it to sign the updater binary.
On Windows Vista/7, an application .exe or DLL cannot be deleted if in use, but the updater can move the existing .exe/DLL out of the way into a temporary directory and schedule it for deletion on the next reboot.
On Ubuntu, 3rd-party repositories are disabled after distribution updates. Google works around this by creating a cron-job to re-add the repository if necessary.
Shameless plug: Fervor, a simple multiplatform (Qt-based) application autoupdater inspired by Sparkle.
Shameless plug: this a relatively old question, but I thought that it may be useful to mention a library that I created recently, which I named "QSimpleUpdater". Aside from notifying you if there's a newer version, it allows you to download the change log in any format (such as HTML or RTF) and download the updates directly from your application using a dialog.
As you may expect from a Qt project, it works on any platform supported by Qt (tested on Windows, Mac & Linux).
Links:
Website
GitHub repository
Screenshot:
Though it works a bit differently than Sparkle, BitRock InstallBuilder contains an autoupdater written in Qt that can be used independently (disclaimer, I am the original BitRock developer). It is a commercial app, but we have free licenses for open source projects.
I've developed an auto-updater library which works beautifully on Mac OS X, Linux and pretty much every Unix that allows you to unlink a file while the file is still open. The reason being that I simply extracted the downloaded package on top of the existing application. Unfortunately, because I relied on this functionality, I ran into problems on Windows as Windows does not let you unlink an open file.
The only alternative I could find is to use MoveFileEx with the replace on reboot flag, but that is awful.
However, renaming the working directory of the application works on Windows 7 and Windows XP. I haven't tried Windows Vista yet.
I have found WebUpdate to be quite useful, though it's written with the wxWidgets. But don't worry, it's a separate app which handles your updates. The steps to integrate it are pretty simple - just write two XML files and run the updater. And yes, it's cross-platform.
The advantage of it is it will automatically download and unzip/install all you required and not just provide a popup with a notification about a new version and a link to download it. Another thing you can do with it is customizable actions.
Project's main page is here, you can read the docs or take a look at the official tutorial.
The blog post Mixing Cocoa and Qt may solve the problem for the Mac platform.
You can use UpdateNode which gives you all the possibilities to update your software. It's using a cross platform Qt client and is free for Open Source!
UPDATE
Just did some further analysis on that and really like this solution:
Pros:
Free for Open Source!!! Even the client is Open Source: https://github.com/updatenode/unclient
The client is already localized in several languages
Very flexible in terms of updates. You can even update single non-binaries.
Provides additionally a way to display messages though the client.
Ready to use binaries & installer for all common Linux distributions, single Windows binary, as well as installer and a solution for Mac (which I have not tried, as I don't have a Mac)
Easy to use web service, nice statistics and update check is integrated within few minutes
Cons:
I am missing a multi-user management in the online service. Maybe they will do it in future - I will definitely suggest that in their feedback portal
The client is a GUI client only - so, you will need to shrink it down to run without a GUI frontend (maybe only necessary for people like me ;-) )
So, bottom line, as this solution is quite new, I think there is lot of potential here. I will definitely use it in my project and I am looking forward for more from them! Thumbs up!
This is an old question but there is not Squirrel in answers which is BEST SOLUTION , here is what I'm doing in qt 5.12.4 with qt quick "my qml app" you can do this in any other language
I'm doing this in windows there is mac version of squirrel too, I don't know about Linux
download nuget package explorer release
https://github.com/NuGetPackageExplorer/NuGetPackageExplorer/releases
open nuget package explorer and add this directory 'lib/net45' it doesn't matter you have a .net app or not, I did this for my qt application otherwise it won't work.
add all files into this folder specify your version in the metadata
save nupkg file
download squirrel release https://github.com/Squirrel/Squirrel.Windows/releases
add squirrel to windows environment path
open cmd and cd to directory of nupkg file
squirrel --releasify file_name.nupkg -> now inide releases folder, there should be setup.exe file which will install app and other files.
to create new version do 2,3,4,7,8 again if its an update it will create delta file which is only needed file to update, put this files into your service directory for example in updates folder of your website which you need to disable directory browsing in IIS , and to auto-update application you need to call Update.exe which is in parent folder of application root directory appdir/../update.exe --update http://yourserver.com/upates/ after application restart app should start with new version
you can find documentation for squirrel in https://github.com/Squirrel/Squirrel.Windows/blob/develop/docs/getting-started/0-overview.md and nuget package explorer here https://github.com/NuGetPackageExplorer/NuGetPackageExplorer and you can use only nuget.exe too if you don't want to use nuget package explorer which can be used for dynamic generation of versions, which can be download from https://www.nuget.org/downloads
That easy. Now you have auto-update app which will download updates from the server and auto-update app. For more info you can read documentations.
note: for iis uses https://github.com/Squirrel/OldSquirrelForWindows/issues/205
I suggest you read on plugin and how to create and use them. If your application architecture is modular and be split into different plugins. Take a look at Google Auto Update utility http://code.google.com/p/omaha/. We use this.
Thibault Cuvelier is writing a tutorial (in French) to develop an updater. I know the explanations are in French (and everyone is not understanding French), but I think this can be readable with a web translator like Google Translate. With this you will have a cross-platform updater, but you need to write it by yourself.
For what I know, the only part of the updater that is explained in the tutorial, is the file downloading part. In the case this can help you, refer to the tutorial, Un updater avec Qt.
I hope that helps.
OK, so I guess I take it as a "no (cross-platform) way". It's too bad!
I have found a solution that can be automated with built-in self-extracting patches and updates. for windows. I have started using their sdk. take a look at the massive documentation here, https://agersoftware.com/docs/ the sdk is called securesdk and comes with their app, SecureDelta sdk. does a great job on any kind of files, better results than lzma-included delta updaters