I have a website on which I have published several of my applications.
Right now I have to update it each time one of the applications is updated.
The applications themselves check for updates so the user only visits the website if they don't have a previous version installed.
I would like to make it easier for me by creating a single executable that when downloaded and executed, will check with the database which version is the most recent and then download that one and run that setup.
Now I can make a downloader for each application, but I rather make something more universal with a parameter or argument as the difference.
For the download the 'know' which database to check for the most recent version, I need to pass on the data to the downloader.
My first thought was putting that in a XML file, so I only have to generate different xml files for each application, but then it wouldn't be a single executable anymore.
My second thought was using commandline arguments like: downloader.exe databasename
But how would I do that when the file is downloaded?
Would a link like: "https://my.website.com/downloader.exe databasename" work?
How could I best do this?
rg.
Eric
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I'm developing an application that uses SQLite for its data files. I'm just linking in the SQLite amalgamation source, using it directly.
If the user chooses to create a new file, I check to see if the file already exists, ask the user if they want to overwrite the file, and delete it if they say yes. Then I call sqlite3_open_v2() with flags set to SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE to create and open the new data file.
Which is fine, except, what happens if a malicious user recreates the file I'm trying to open in between the file being deleted and SQLite opening it? As far as I'm aware, SQLite will just open the existing file.
My program doesn't involve passwords or any kind of security function whatsoever. It's a pretty simple app, all things considered. However, I've read plenty of stories where someone uses a simple app with an obscure bug in it to bypass the security of some system.
So, bottom line, is there a way to make sqlite3_open() fail if the file already exists?
You might be able to patch in support for the O_EXCL option flag of open(2). If you are using SQLite on a platform that supports that.
(Forgive me since I am not use to posting here. Will do my best)
I am working on an iOS application that will be using a pre-populated database. In my workspace, I have a project for the iOS app and a separate command line tool project to populate the database. I have dragged the database file from the "/Library/Application Support" folder into my iOS project (without using the "Copy Items If Needed"). So when there is a change in the data or additional data is required, I can just run the command line tool to pre-populate the data. From there I will remove the app from the simulator and do a clean. When I run the app, I would think everything would be ok.
It was driving me crazy for the longest but sometimes, I don't see the changes reflected after I remove the app, clean the project and then run. It seems the only way I can get this to work is, after I run the command line tool to pre-populate the database, I have to open the database file using Base, SQLiteStudio or Firefox's sqlite add-on. Once I do that, it seems to work.
When I look in finder, I do see the files .sqlite, sqlite-shm and sqlite-wal. Before opening the database file, I see that the wal file is the biggest (for now it's 2mb). Once I open the file using Base for example, and then close it, the sqlite file is now 2mb.
When the command line is about to finish, I have tried running PRAGMA statements on the file (vacuum, wal-checkpoint) but those did not work. What am I missing here. I also tried using NSManagedObjectContext.MR_defaultContext.saveToPersistentStoreAndWait
I am using the following code to setup and save.
MagicalRecord.setupCoreDataStackWithAutoMigratingSqliteStoreNamed("callithome.sqlite")
MagicalRecord.saveUsingCurrentThreadContextWithBlockAndWait({(context)->Void in
println("Data saved, I hope")})
MagicalRecord.cleanUp()
Any help would be appreciated
You need to enable the DELETE pragma mode for your sqlite store. This will not create the -wal and -shm files. This will make it easier for you to have a single file for use at your pre-populated data store. You will need to use MagicalRecord 3.0 with some of the extra abilities to add custom options to your stores if you'd like o go that route. However, you can still add a store to a coordinator and have that store configured with the proper pragma option as well. That is, MagicalRecord is not necessary if you use normal Core Data.
We have a Qt app that when it starts tries to connect to a servlet to get config parameters that it needs to keep running.
The URL may change frequently because we have to test the application in several environments. Right now (as a temporary solution) the URL is a constant in source code, but it is a little bit ugly.
Where is the best place to mainting this URL, so that we do not need to change the source code every time I want to change the environment target?
In a database table maybe (my application uses a SQLite DB), in a settings file, or in some other way?
Thank you for you replies.
You have a number of options:
Hard coded (like you have already)
Run-time user input
Command line arguments
QSettings
Read from a bespoke file as text.
I would think option 3 would be the most simple to implement without being intrusive, but it does depend on what kind of application you have.
I would keep the list of url in a document, e.g. a XML, stored in a central, well known place, e.g. a known web server, and hardcode the url of the known place in the app.
The list could then be edited externally without recompiling your app;
The app would at startup download and parse the list, pointing to the right servlet based upon an environment specified as a command line parameter.
Before I attempt to program the following function myself, I wonder if something already exists.
What I would like to do is click an edit link on my website for a given document, and have that document launch in the native editor on my local machine (via a temporary file mechanism).
When I save the document in the native editor, the document is HTTP PUT back to the website. This can be accomplished by watching the file for writes, or watching the editor process for exit.
This way I can more easily edit documents on the web (instead of going through the download / edit / upload cycle).
My design would work as follows:
Register .webedit files on the local machine.
When a .webedit file is downloaded, launch webedit.exe with the file.
The file contains a URL (http://server/document) which is checked against a security database to ensure we're only opening allowed URLs.
The URL is downloaded to a temporary location.
The temporary file is launched in the native editor.
The file is watched for changes, and uploaded (HTTP PUT) on change detection (or when the editor is closed, if it's not a single-instance multiple-document editor).
Lots of FTP / SCP GUIs have this type of functionality, but I have not been able to find it for the web in general, or a shared library that allows you to plug in to this function.
Has anyone seen a program that does this?
SharePoint works like this.
It's great for managing shared documents in corporate environments.
Users can even checkout/checkin documents & the features are very extensible..you can customize pretty much anything if you know how.
Edit:
Since you're on Linux..i've heard that Alfreco is a great alternative.
I've never used it, but I know a couple organizations using it instead of SharePoint.
It integrates with Microsoft Office as well.
Also, it will definitely be cheaper.
I need to iterate through infopath templates (xsn files) and change the URL of data connections, and then save the changes to the templates.
The data connections I want to change, points to lists in a sharepoint environment.
So, how could I accomplish this task?
I was thinking doing this with a console application.
Infopath definitely doesn't make it easy to deploy to different servers. I have used a powershell script but you can use any console app or scripting language.
Steps to follow:
1. Extract the files from the XSN (either use extrac32 util from MS or rename to zip and use any zip library)
2. Change the data connection (string replace) in manifest.xsf, template.xml, and sampledata.xml
3. Repackage the files into the XSN (either use cabarc util from MS or zip and rename)
It is a pain to have to do all that but the entire script is less than a page long and runs pretty fast. One caveat I ran into was I needed a delay between steps 1 and 2 - the files weren't actually finished extracting and my script was trying to change them.