rt4 posted:

One question is how do you set up a game server manually? Do you have an image for each type of server? Are these cloud servers? Does your preferred host have an API for setting up new servers?

OtspIII posted:

I've been working on a sort of living rulebook for an RPG in React/Express/MongoDB for a bit now, and the a proof of concept of the core functionality is pretty much done, and my next stem requires me to figure out how user accounts are going to work. I've realized that there's a pretty big question I don't know the answer to in how apps like this are structured.

Given that I'm modeling this after a client/server/db pattern that uses three different ports, how hard would it be to package this as a stand-alone program that could be downloaded and used without needing an internet connection? Is there some framework or bundler that could take the three different processes running and put them behind a single clean access point? An ideal version of this would probably boot up in its own window, but something that just loads as a Chrome tab could probably work as well.

The norm with RPG products like this is that they tend to just be a pdf file, but I wanted to make an equivalent that was a bit more interactive. I could just make this a website that you log in to, but I'm worried that requiring an internet connection excludes too many use-cases for this type of thing.

The Fool posted:

It gets some hate, but check out Electron.

You’ll need to figure out a way to package your dB component separately though.

OtspIII posted:

Is that an issue with all styles of DB or specifically MongoDB? I've been intentionally keeping the ways the app interacts with the database pretty bottlenecked to make it easy to swap out data storage systems if needed.

fankey posted:

I'm trying to come up with a scheme to encrypt a stream 24bit pcm audio without adding any additional data to the stream. Assuming that both sides agree on the AES key through some other mechanism is there a way to accomplish this? A few possible gotchas

OtspIII posted:

Okay, I've got some follow-up misc questions I've built up over the weeks of working on this that I haven't been able to google my way out of. Here's my first:

In React, is there any way to force a URL change in response to a promise being resolved? I mostly navigate between pages via ReactRouter Links, but sometimes I need to wait for a DB call to go through before I trigger the page change. As an example: I hit a button that creates a new page, and would like to be taken right to the page to start setting it up. The issue is, I can't navigate to the page until its data has first been inserted into the DB.

I've been able to make handmade Links with useHistory(), but since that needs to be in a function-component I can't really trigger it from the promise either. I feel like this should be easy to do, but I can't get it to work and any googling I do just takes me to the basic useHistory() usage.

fankey posted:

fankey posted:

It's 48k uncompressed audio with no silence suppression. Using ECB mode could leak silence but I think CTR or other modes defeats that.

Volmarias posted:

My point is less what the content of your packets are, and more of when they are sent.

quote:

combines four different techniques for audio encryption in the same scheme which makes it more secure: self-adaptive scrambling, multi chaotic maps, dynamic DNA encoding and cipher feedback encryption. Also, it introduces two new designed multi chaotic maps as pseudo random generators that combine five different chaotic maps with eight control parameters. The scheme consists of three phases with three secret keys. The first phase is a self-adaptive bit scrambling where SHA512 of the input audio is computed to be used as a first secret key for cyclic shifting the input audio binary stream which efficiently reduces the strong correlation between neighboring audio samples. The second phase is a dynamic DNA encoding of the scrambled audio...

fankey posted:

I'm trying to come up with a scheme to encrypt a stream 24bit pcm audio without adding any additional data to the stream. Assuming that both sides agree on the AES key through some other mechanism is there a way to accomplish this? A few possible gotchas

• no additional bandwidth or data can be transmitted
  
• no handshake is available to know when the data started. It just shows up in a buffer
  
• the transport is unreliable and audio may be missing for multiple samples ( most likely multiples of 48 ) in a row. In this case they will be 0s
  
• no outside mechanism is available to synchronize the aes block
  
• playing back bad audio is not acceptable. If the audio is missing 0's should be played back
  

fritz posted:

Put 5 24-bit samples in a single 128-bit buffer, fill the other 8 bits with 0, encrypt, send, then the receiver just drops those 8 bits.

infinite99 posted:

I'm trying to deal with some OCR output from images of tables and I'd like to be able to extract certain things out of these tables. I'm using the Azure service to do the OCR which gives me it's predicted text and bounding boxes for anything it scrapes out. So far the output is actually pretty good and I'm pretty impressed with it.

My issue now is actually getting the relevant parts of the output and throwing those into a structured database. It looks like the OCR reads things row by row and the JSON that it returns seems to reflect that so that's kind of helpful but without knowing what cells the information is sitting in, I can't reliably scrape out the information. The tables aren't always consistent either so that's another issue. I've done some image manipulation using OpenCV to figure out the cells of the table which gets me a bounding box and I can check where each portion of the OCR output falls within a box but it's not very consistent. Even trying to figure out the table headings is kind of an issue since they can exist at the top of the table or the bottom of the table. Any skewing in the image also messes up my calculations for the table as well but that might be something I can fix.

Here's some examples of what I'm working with:





The information I want to grab out is the Rev number, Date, and Description.

I feel like I'm way over-complicating this problem but I've been stuck for days trying to figure out a good solution to this so any help to point me in the right direction would be super appreciated!

CarForumPoster posted:

Is there a database/big data thread somewhere?

CarForumPoster posted:

hahaha I've done this exact task before with a mix of AutoCAD files, mylars, scanned drawings, etc. in the days before useful OCR. It loving sucked. Best of luck.

Here's how I'd go about it:
Scenario 1) If I had to do ~2000 drawings and they were in a security environment that this would be acceptable, I might have OpenCV auto crop the revision block so youre not sending IP to who knows where. Save the cropped file with a relevant file name, then I'd just get someone on Amazon Mturk/fiverr/upwork to do it manually for like $50-$100. As an engineer I'm getting paid to deliver results, not write code. Save the results in a google sheet if its an upworker or if its mturk just parse the resulting CSV. 2000 drawings would get done in prob 1 day using mturk because you have a large numebr of people doing them in parallel HOWEVER you would want to ALSO have people audit the results. Maybe some highly rated mturk people, maybe you, maybe an upworker. For quick and dirty projects in the past, I've just made a little HTML page with radio buttons where I glance at the work side by side to approve or disapprove it. I then have any disapproved ones automatically go back to mturk for reprocessing.

Mturk quality aint great but for a task like this is VERY easy to set up and parallelize. If you do the mturk route, a good rule of thumb is >1000 completed HITs, english speaking country required (Make a list. If you want to cheap, include Bangladesh, Philippines, etc.) , >98% approval on HITs. You should time yourself doing 10ish of the HITs yourself and try to budget about ~$6-7/hr.

If I had >>2,000 drawings to do or a security environment where they'd say gently caress you to the above idea, I'd try to use Open CV to find where to crop, I might try to manipulate the image to make any detected lines straight since on scan they might've gotten skewed, feed the cropped and corrected image to an OCR service like Azure or Amazon textract. Give textract a try too, they advertise table extraction but I've not had steller luck with it.

If, for some reason, I can't make Open CV can't reliably find the rev block to bound and crop it, I might try to do an image recognition based approach where I use a NN to find the rev block then I crop the image based ont he outputs of the NN.

Last option is to hire a few people overseas to do it with no cropping and make them sign NDAs.

infinite99 posted:

I guess I just need to work on the process of figuring out the cells of the table through image manipulation to be able to build the table in memory and insert the text based on coordinates.

Thanks for the suggestions though!

CarForumPoster posted:

If you need real scale of largely templated drawings then may I suggest: https://scale.com/document

This is a real problem thats worth a lot of money, so I wouldn't count on being able to roll your own to >>90% accuracy. That said I have never had great luck with OpenCV unless I have a fairly consistent image dataset.

Dominoes posted:

Don't learn JQuery. You need to learn to program for web servers, which is most easily done with a backend framework. PHP and node are popular examples, but they're both a mess. I recommend starting with a batteries-included framework like Python/Django, or Ruby/Rails. Another approach is using a minimal framework, like FastApi or Flask for Python, or one of the ones for Go or Rust. You'll have to write more manual code for solved problems this way, or use addons. Eg for the email notifications, login you mention.

You can complete your objective without using SQL, since the frameworks include high-level tools (called ORMs) that execute the SQL for you. That said, I recommend learning it, as it's universal, and will protect you from getting stuck in a particular framework, and its provincial DB dialect.


TLDR: Follow this tutorial to completion.

fuckwolf posted:

Thank you both. After reading a bit more about Python and Django, it sounds like the right direction. I’ve started working through the Google Python course as well as dipping my toes in the DjangoGirls material. So cool that there are so many free resources for learning this stuff. Exciting!

fuckwolf posted:

a website ... registered users ... easily add, edit, sort, and export data sets. ... replace Excel sheets ... features: create an e-mail notification when data falls outside of a certain range, display charts based on the selected data, and generate custom reports such as "Here's the trend for the last 30 days of brand X."

fuckwolf posted:

refreshing my understanding of HTML and CSS. [...] Javascript and JQuery [...] Ruby [...] PHP and SQL

quote:

1- handle adding to and retrieving from the database?
2- What do I need to know to generate e-mail notifications?
3- What about username and login stuff?
4- Does this all sound possible for someone who doesn't know what they're doing? Any general tips?

Xeom posted:

Is it really worth hashing integers for a hash table if the size of all your tables are prime?
You can't distribute the set of numbers any more evenly. They already distribute perfectly when n % p.

I guess you could get some bad behavior if all your keys have the same divisor, but its not clear to me that hashing the keys wont stop you from making issues in another part of that set of numbers.

Is there any good information on why you should hash integral types?