On linux, is it considered good practice to use filesystem APIs to access device info, or would it be better to look for more specific APIs? Ask Programming |
- On linux, is it considered good practice to use filesystem APIs to access device info, or would it be better to look for more specific APIs?
- Just started trying to learn C++, can’t even get a simple program to run
- I'm thinking about learning server-side subjects.
- Ternary operator
- What advantage does a constant have over a variable you just don't change?
- How does moodle work?
- Run fail issues (C++)
- What's your opinion on the Haxe programming language?
- I couldn't fix the infinite loop despite 40 hours paid. How to discuss?
- My code turns spaghetti when I optimize it. Am I the only one? How can I prevent this (aside from using comments)?
- Detect s-pen input on samsung tablet in order to make straight lines?
- (c++) What does the i mean?
- Flutter/Reactnative/Native for map app.
- We have no video player to watch any lectures or anything. Replacement for Google's youtube that does this ? ?
- Copy links of youtube videos and paste them into a text file
- Help with NAS/Cloud/Git combo
- Understanding system calls in x86_64 Linux
- How should I go about protecting an entire express+react app with a password
- Intercepting service worker push messages
- Pseudocode works great until I hit double loops
- Pandas and dataframes, lambda help?
- Hey, could someone help me out with creating a flowchart if I pmd them?!
- How do I use D3DKMTGetDeviceState or D3DKMTGetScanLine?
- what was the most important recourses that you used through your programming journey
- Super secured pc
| Posted: 04 Oct 2020 07:51 AM PDT I'm working on a program on Linux that needs to work with usb devices. I could get all the information I want about device trees, serial ports, etc.. by porgrammatically opening files in /dev/* and /sys/bus/usb/*, but for someone coming from Windows, it seems a bit odd to me to open files to get information about usb devices. Having worked a lot with similar windows APIs, it would feel more natural to look for a built in system library and use its functions to query usb device information. I want to make sure that my software works properly on as many different linux distros as possible. I don't know if these 'virtual file paths' are standard across all of linux, or if it's even recommended to use them in programming. [link] [comments]  |
| Just started trying to learn C++, can’t even get a simple program to run Posted: 04 Oct 2020 06:31 PM PDT So, I Just began learning C++ and am watching a tutorial series by Caleb Curry, it's a 10 hour long tutorial on the basics, so I just started, we wrote a small program and we were going to test it in the terminal by saying "g+ Starter.cpp" (Starter.cpp is the name of my folder) and it just keeps saying "the term 'g++' is not recognized as the name of a cmdlet, function l, scriptfile, or operable program" I created the exact same code as Caleb but his works and mine doesn't, help? [link] [comments]  |
| I'm thinking about learning server-side subjects. Posted: 04 Oct 2020 08:28 PM PDT Recently, I'm interested in SQL and server-side subjects. So, I'm thinking of turning my old HP laptop which has N3060(very weak CPU) in it, into a toy server laptop with Ubuntu-server or any other Linux. It has only 4GB ram, but surprisingly it works with no problem. Just extremely slow for web browsing. The question is 'is that weak laptop also good for a newbie for studying server-side?' [link] [comments]  |
| Posted: 04 Oct 2020 03:37 PM PDT i'm learning Lua and i leaned that using logic operators you can mimic the ternary operator, but i don't understand why if you compare a bool to a int it returns a int Why [link] [comments]  |
| What advantage does a constant have over a variable you just don't change? Posted: 04 Oct 2020 11:13 AM PDT My understanding is that constants are values that are fixed, and variables change, which is simple enough. I want to know what advantage a constant has over a variable that won't ever be changed, with the following pseudo code as an example. And let's say My question is, why can't I just have them as variables? They won't ever be changed, so what does setting something like that as a constant actually do? [link] [comments]  |
| Posted: 04 Oct 2020 09:21 PM PDT Is it hard to use/modify? Would it be too expensive to get someone to help me set it up as I want it to be? [link] [comments]  |
| Posted: 04 Oct 2020 07:10 PM PDT Hello, Getting a run fail issue when choosing "transaction type" program auto says "not transaction type". Here is assignment description. "Write a C++ program that prompts the user for an Account Number(a whole number). It will then prompt the user for the initial account balance (a double). The user will then enter either w, d, or z to indicate the desire to withdraw an amount from the bank, deposit an amount or end the transactions for that account((accept either uppercase or lowercase). You must use a switch construct to determine the account transaction and a do…while loop to continue processing." Planning to add loop once I get program to run once without loop. Thanks for any help [link] [comments]  |
| What's your opinion on the Haxe programming language? Posted: 04 Oct 2020 04:08 AM PDT It's a language that came out 15 years ago and it basically transpiles to other languages or compiles to source for several platforms, as I've understood. But nobody is talking about it and there's not so many stuff out there about it. Why? Did it just happen that it's not popular or there are actual reasons to hate it/not prefer it among other alternatives? It also looks a lot like TypeScript, and it can also transpile to JS, but still Typescript is the one that's popular despite not being "original" [link] [comments]  |
| I couldn't fix the infinite loop despite 40 hours paid. How to discuss? Posted: 04 Oct 2020 05:57 PM PDT Last week the lead programmer was out on vacation and I couldn't complete any of the tasks given. My primary issue to solve involved a program that had an infinite loop. I believe this due to how it iterated through data to check for conditions, the parameter in recursion grew faster than it could reduce itself. I'm closer, but tomorrow I'll provide my best solution is a dumb "break" after 2000 recursions. It works technically, but I obviously don't like it. Anyway, I'm not sure how to explain this to the lead programmer. I didn't change my open issue I was working on all week despite not making visible progress. [link] [comments]  |
| Posted: 03 Oct 2020 11:37 PM PDT |
| Detect s-pen input on samsung tablet in order to make straight lines? Posted: 04 Oct 2020 05:54 PM PDT So I hate the fact that Onenote on android is really limited. I have this Samsung tablet on which I take notes in class with the s-pen. I would like to programm an app that at the end will be a circle over the interface like others apps already do. Simply you press the circle and till is pressed you can draw straight line. So I was thinking that I need to detect the input of the pen and write some code where I define x and y that is the position of the start, etc.(I didn't think about this yet but it's okay It will be the funny part anyway, right?lol). I have experience in coding and I would like to put this project on the cv.. Thank you [link] [comments]  |
| Posted: 04 Oct 2020 10:04 AM PDT I'm learning c ++ and although this has been explained to me, I can't understand what i is in an operation, here is an example for(int i = 1; i <= n; i ++). I know it is supposed to be the loop of the operation that is performed but still I'm having a hard time trying to understand it. Thank you so much if someone can explain it to me!! [link] [comments]  |
| Flutter/Reactnative/Native for map app. Posted: 04 Oct 2020 12:02 PM PDT Hi! To develop a map app about trails, POI and other map related stuff, what would you choose?
It's tempting to use Flutter or React Native, but I'm worried about flexibility of the frameworks. [link] [comments]  |
| Posted: 04 Oct 2020 11:40 AM PDT Looking for something like https://iina.io/ but it's only for mac Need something like this ^ but doesnt seem like it exist, and progress in desktop video player is super lacking and seems pretty much dead since everyone just uses youtube video player Seems like there's nothing like youtube video player for desktop Very few needs:
Need desktop video player Things that don't do the above vlc confirmed by a user that knows about vlc Media Player Classic and r/MPCHC is dead with no users freetube has no desktop version ?? [link] [comments]  |
| Copy links of youtube videos and paste them into a text file Posted: 04 Oct 2020 11:26 AM PDT I want to make a program that copies links of all of the youtube videos from a channel and pastes it into a text file. Are there any tutorials or something that could help me? Thanks [link] [comments]  |
| Posted: 04 Oct 2020 07:14 AM PDT Hello, I have a question. I want to follow the following guide: https://opensource.com/article/18/9/host-cloud-nas-raspberry-pi with the addition of adding a Gitlab server. Do i need make any precautions to make this works? Some brainfarts: - I want to make two folders: Cloud & Gitlab. Any help is welcome! [link] [comments]  |
| Understanding system calls in x86_64 Linux Posted: 04 Oct 2020 10:07 AM PDT Hey all, quick question about system calls in x86_64 Linux. So, if I have a simple C program named program.c, and I disassemble it into an .asm file by running "gcc -S -o program.asm program.c", which lines of my assembly code correspond to a system call? I've read a little bit of documentation and it looks like the return value of a system call is stored in the %rax register. So if I have the following instruction in my .asm file: movq %rax, -32(%rbp) Does this mean a system call is occuring? If so, how do I know which system call it is? I looked at this table (https://filippo.io/linux-syscall-table/) and I don't see any system calls for negative numbers (-32). [link] [comments]  |
| How should I go about protecting an entire express+react app with a password Posted: 04 Oct 2020 04:00 AM PDT I am creating a express + react app. I want to have the option to protect the entire app with a single global password. I want this to prevent access to any static resources on the server until the user has entered the global password. Theoretically I could accomplish something like this by creating a middleware that blocks all static files unless a user has set a cookie to the password. However that just doesn't seem like the right way to do this and maybe there is a different server side technology I can use to protect the app? [link] [comments]  |
| Intercepting service worker push messages Posted: 04 Oct 2020 05:17 AM PDT I was trying to make an extension that would catch push messages on the chrome browser and run a code on the payload. However, despite searching everywhere online, I was unable to find anyone who shows how to this is done. This had me wondering if it is actually possible. So far, I know that each website has its own service worker which are registered on the browser, then once you subscribe to the push notification of the website the service worker listens to push events sent by the push service. I have tried overriding the service worker js file using chrome devtools override section, nevertheless it didn't work. I also noticed that the devtools are able to record push messages at the application -> background services -> push messaging compartment, I am curious how is it capable of recording these push messages, is there some sort of chrome library that it is utilizing? I am currently new to javascript and programming in general so I'd appreciate if you would advice me on how I should approach this problem. Thanks for reading. [link] [comments]  |
| Pseudocode works great until I hit double loops Posted: 04 Oct 2020 08:23 AM PDT i'm getting ready to do algo practice ahead of interviews and double loops (or more) have always been my bane. Sometimes I can do them no problem, other times I lose the plot and the task goes sideways. Under the watch of an interviewer that's not okay. Do you guys have any tips on reducing complexity and / or clarifying intent and understanding in conditions that call for double or triple loops? One thing I have thought about is taking the nested loop behavior out of the main flow, like so: As a side question I'm also curious if this level of pseudo takes too long during an interview? It takes a while to write and think through. [link] [comments]  |
| Pandas and dataframes, lambda help? Posted: 04 Oct 2020 07:43 AM PDT See: https://imgur.com/rerRe1c The top represents what my dataframe looks like now, the bottom represents what I'd like it to look like. The logic is that for an ID/Date, a person either wins or doesn't win the value. 2DayWinPct is the given UserID's winning percentage over the 2 days prior to the date listed (e.g. ID 1 date 2019-09-04 the value is 0.5, because they won on 2019-09-02 but did not win on 2019-09-03). 2DayAvgWin is similarly calculated -- the sum of their wins divided by the number of times they won for the prior two days. I am able to produce the bottom table using SQL but the DB size makes it better to get simple data and do the processing with Python so I'd like to try doing it that way. I'm still picking this stuff up as I go, and I'm fairly sure lambdas are involved, but I could definitely use some assistance. Thanks! EDIT: It's also important to note that if a certain ID doesn't show up for a day, that doesn't affect percentage. For example, if ID X shows up on 2020-01-01 (winning) and 2020-01-03, but not on 2020-01-02, then their 2DayWinAvg for the 2020-01-03 date will be 1, not 0.5. EDIT 2: This is a simplified version of what I'm doing, in reality the period is not two days but set as a constant earlier in the code -- I figure if I can just get a loop/lambda for the two day period I can use the same/similar logic if it were an X day period. [link] [comments]  |
| Hey, could someone help me out with creating a flowchart if I pmd them?! Posted: 04 Oct 2020 12:58 PM PDT My flowchart requires there to be like four different outputs and I'm just so confused to like how to make it all work out ?! Thank u🙂 [link] [comments]  |
| How do I use D3DKMTGetDeviceState or D3DKMTGetScanLine? Posted: 04 Oct 2020 06:44 AM PDT C++ (Visual Studio), Windows. For timing reasons, I would really like to find out some information about when the last Vsync was. After a lot of fruitless searching, I finally found two DirectX functions, either of which may give me the information I need. But I'm completely clueless as to how to use them. I can't seem to work backwards from the functions to find a good explanation, nor have I made much progress starting from the beginning with DirectX. So, really, and I know this is a bit lazy, but I'm hoping will be able to give me some hints or a brief guide on how to get the info I need. My program doesn't have anything to do with DirectX otherwise. Option 1: D3DKMTGetDeviceState This function needs a D3DKMT_GETDEVICESTATE struct as input, and it looks like I need to fill at a minimum:
I have no idea how to get hDevice, and I'm only guessing it refers to a graphis card. Option 2: D3DKMTGetScanLine As input this requires: with the first two variables completed. I'm assuming hAdapter refers to a graphics card (despite not being called hDevice as above), but I've got nowhere trying to work out what a VidPnSourceId is. Does anyone have any hints on how to properly use either of these? Thanks! [link] [comments]  |
| what was the most important recourses that you used through your programming journey Posted: 04 Oct 2020 06:26 AM PDT i mean by that (a book , website ,a way of thinking :D ,advice from prof etc.....) that helped u to learn coding faster and understand programming more ( i hope i made my point clear :D) [link] [comments]  |
| Posted: 04 Oct 2020 03:46 AM PDT I'm trying to use multi factor authentication to encrypt one of my boot drives. I've found a software that allows for an encryption solved by a USB key on top of a passcode, I want to take it further though and require some form of wireless approval, I'm thinking either via another device on the network or a Bluetooth device. Anybody know how I can do this? It's Ubuntu btw. P.S. I don't have any practical reasons for this, It's way overkill and would fail instantly if someone threatened to hit me. [link] [comments]  |
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