Recently I've ran into a big problem with pugiXml (used within cocos2d-x engine).
Shortly, I've made a quiz game (in mentioned Cocos2d-x). I keep my questions (and some other data) in an Xml file. On new game they get parsed and inserted into dictionaries. If a question is answered, a short string indicating the answer (whether it was good or not - Y/N) is inserted into that Xml file (below that particular question). Later, I use this data to show statistics (I count the percentage of questions with good answers - which is counting the amount of Y's divided by the amount of questions, multiplied by 100).
I use:
CCFileUtils::sharedFileUtils()->fullPathForFilename(o_QA);
to get the file and later
pBuffer = CCFileUtils::sharedFileUtils()->getFileData(fullPath.c_str(), "rb", &bufferSize);
to put file into buffer and
pugi::xml_parse_result result = doc.load_buffer(pBuffer,bufferSize);
to parse data and start working on it.
Finally, I save the file with:
doc.save_file(fullPath.c_str());
Android:
It's working very well, although I had to copy the file with questions to /data/data/app/Files/ . Still, It's keeping the changes on many devices.
iOS:
Unfortunately, on iOS it's not working. Data get loaded and parsed (which means, that I can actually play the game), but they are not saved. I've tried moving the files to other folders (started from Resources/Documents, then main Resources folder, Resources/Library/Application Support). It's still not saving the data and I don't know what to do. The result is my statistics not being counted well (it doesn't matter how you answer the questions - all of them are false, because the Xml file is not being updated).
Did anyone run into similar problem?
Can you, please, help me?
I am doing something similar in my own app, using both pugixml and cocos2d-x. So I can confirm this combination works well.
Rather, because on iOS you cannot both read and write the data from and to the app bundle (which is read only), you will need to implement a simple check in the writable document directory - If you a saved file there, load it, if not, load from the app bundle.
So in essence for loading, if your saved filename is "my_save.xml", here is an example flow:
1) Construct a path for your save file in the writable folder by concatenating the writable folder path + your filename. CCFileUtils should have something like getWritablePath() for that.
2) if the file exists in the folder, load it. Otherwise, go to 3).
3) Construct a path to your original data file from the app bundle, using CCFileUtils::sharedFileUtils()->fullPathForFilename(). Load the file from there.
For saving, simply do step 1 and save the file there.
Related
I have an app that lets the user pick local files and send them to the backend to add to their vault. To pick the file, I use FilePicker.platform.pickFiles. It seems to work fine, the file is picked and when it's an image we show a preview to the user (and it always works).
Once the user has picked all their files, we create a list of Future to try and send the files to the backend, then we await the list to resolve. If we deem a picture is too big, we reduce the size using FlutterImageCompress.compressAndGetFile.
This usually works, but on iPhone, there is a seemingly random behavior where the file isn't found and an error is thrown : Cannot retrieve length of file, path = '/private/var/mobile/Containers/Data/Application/3600F812-FD42-4441-A654-766991E45E04/tmp/com.feykro.myApp.int-Inbox/myFile.pdf' (OS Error: No such file or directory, errno = 2)
The file in the example works just fine in other instances, the problem seems random and not directly tied to the file I chose. The problem is not exclusive to pdf files either, as it also occurs on images even though they're picked correctly and displayed in the app.
Any idea what could be causing this ?
Thanks in advance !
I write editor and game and it requires a save game option.
I Just want use a Save folder in game folder. not inside.love
How to get a bug.
Start game
Enter menu by Escape key
Press save game - this create savegame
Press Load game - you get an error "File not exist" but you write this file seconds ago.
I successful save a game in savesm2k folder but it folder outside .love file and i don't know how correct load saved game.
Used engine: Love2d 0.10.2
OS: Linux Mint 18.1 x64bit
I read many manuals and I'm stuck.
For loading save game i use this commands
lsg=love.filesystem.getSaveDirectory().."/M2k-Saves/m2ksave"
lsg=love.filesystem.getSourceBaseDirectory().."/M2k-Saves/m2ksave";
data, size = love.filesystem.read (lsg);
leveldatacopy=freadbin (data);
Why does the program not try read existing file? and report no exist? I try using another command but using GetSaveDirectory broke function WriteMAP (requires for binary map and data writing) etc. but it write files which cannot be loaded in load section.
Maybe I should use LUA for reading files direct from folder but I don't know how to correct DO it.
example with bug.
https://github.com/dj--alex/m2ktest
file m2ktest-load-savegame-test.love
At this moment on every saving i manually replace saved game inside love archive (!) . This is not normal.
Anybody can tell me how i get and correct open saved file? Not from inside .love file . from outside of course. If levels and configs can be readed from love file inside save files must be outside. I can only can create files outside love file . i know love file is a zip archive.
If required i can post a .love file but is game completely done and have 150kb of clean code.
You should not prefix paths with love.filesystem.getSaveDirectory() or love.filesystem.getSourceBaseDirectory(). This is done automatically, internally to the love.filesystem functions. Saying
lsg = "/M2k-Saves/m2ksave"
data, size = love.filesystem.read (lsg)
leveldatacopy = freadbin (data)
should work, and will place the file in the save directory / outside of the .love file or game directory. (Love forbids writing anywhere except in the save directory.)
Love's filesystem model is like a "stack" of filesystems. For file reading, it first looks in love.filesystem.getSaveDirectory() with whatever path you pass in. If it finds a file, it uses that; otherwise it looks inside the love.filesystem.getSourceBaseDirectory() (or – if packed – inside the .zip / .love file). Writing files always goes to love.filesystem.getSaveDirectory(), you cannot write to love.filesystem.getSourceBaseDirectory() (because it may not be an actual directory but a zip file).
I am trying to use the latest official version of the DropBox iOS Core SDK, in particular the DBRestClient, to efficiently keep a document tree up to date on my local computer. However, several features of the SDK don't seem to be implemented as you'd expect, and I was wondering whether I am doing something wrong, failing to understand something, or on the other hand just looking for features that aren't there.
Dropbox has (at least?) two kinds of entities it stores: files and folders. If I make a change to a file in Dropbox, I can detect it by a change in the file's "rev" string.
However, for folders, the rev string doesn't change when the contents changes. For example, it doesn't change in response to any of the following:
Adding a file
Deleting a file
Editing a file
Question 1:
Is this the expected behavior ? If so, does that mean that when I want to know if any of my Dropbox files have changed I must walk through the entire folder tree every time ?
Deltas:
There is a command to get a "delta" of the current contents (of something, the command takes no path parameters) related a "cursor" string. The command looks like it is supposed to return a record of edited files/folders along with a new "cursor" string specifying the current state. However, when I get the delta, the contents are always empty. If I make a change in dropbox, and then send back the previous returned "cursor", I still get an empty delta.
Question 2:
Are deltas currently working in the SDK, and if so can anyone tell me what I am doing wrong ?
Question 1: Yes, that's the expected behavior. Typically you would use delta to watch for changes.
Question 2: Yes, I would assume that delta is working. You haven't shown any code, so it's impossible to guess what's going wrong.
I got an app I'm working on that uses static data from a sqlite database to do various things, While I only need read only access to the database, depending on the episode they pick from the first screen I want it to use a different database file and I want the list of available episodes to be updateable on the fly. and I got help to get the list of available episodes updated, and the proper content downloaded and stored in separate folders, So I know I could when the episode is selected delete the sql file in the documents folder and copy in the new one each time and that would work well enough for what I'm trying to do. but it seems like a bit much extra work to have to check for file, delete file, copy in new one. then open it from there each time the user wants to pick a different episode. and I don't want to put all the sql files together as that will be a bigger hassle then the first route especially if this app stays around long enough to have a long list of episodes.
so my question here is: can I get at least read-only access to an sql file that I've downloaded (or one in the bundle for testing) with out having to first copy it to the documents? and if so how would i open the file?
Can I get at least read-only access to an SQL file that I've downloaded (or one in the bundle for testing) without having to first copy it to the documents directory?
Yes. Files in the app bundle are readable (if they weren't, there would be no point in storing files in the bundle).
And if so, how would I open the file?
It's not clear what you're asking here - if you want to perform SQL queries on the file, you should use the sqlite3 library which is available on iOS.
I am doing something with core data. Since the original sqlite file contains the data in the application. I decide to do the following:
Separate the reading and writing action. Make all the reading from one data source of one sqlite file and make all the writing in another file.
Since there are some rules in the directory in iOS application, I plan to copy all the reading data from bundle to the cache directory and put the writing data in the document directory.
The question is that, is it possible to use the reading file in the bundle resource directly. Which means I don't have to copy it into the cache file and that will save some space for the device.
Or you guys have any other better idea, please tell me.
I put the write data into the document because the file in it can be backuped by icloud, which could act as a feature in my program.
You ask if what you want to do is a good idea, but first you need to think through some possible pitfalls.
I suppose the file in your bundle was also created with Core Data, and it has a MOM. The new file you write - it probably uses the same MOM. What will you do if you ever need to update the MOM? The file on iCloud will be say version 1, and maybe the users iPhone uses Version 1, but your new version 2 is loaded onto the users iPad. Now what? The ipad should not update the repository as that would make the iPhone fail when it tries to use the data - the ipad has no way of knowing if all other devices have updated or not.