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A website for observing Taiwan stock market.
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QUESTION
I have to make an app that scans an NFC card, then takes a picture at the same time and send this information to a server, but my problem is that devices on android 11 doesn't detect my NFC Tag unlike devices on android 6 to android 9. I enable the foreground dispatch when i press a button (to take a picture (in, in2b and out2b) and then disable it only in onPause method. Also, when my app is running, the other apps (like NFC Tools) can't detect any NFC tag unless I stop my app. if anyone has any idea of the source of the problem, its welcome help, thanks Here is my code :
...ANSWER
Answered 2021-Apr-14 at 13:36There have been a number of questions on this recently and it seems to be very device specific and the documentation for the old Camera API says that some devices might block the main event loop of your App and as the old NFC API you are using requires your App to be Paused and Resumed for the main event loop to receive the data from the NFC.
If you are targeting API 19 and above for your App I would always use the newer and better NFC API called enableReaderMode
, instead of enableForegroundDispatch
.
This newer API gives you more control and it does not require your App to be paused and resumed and the data is handled in it's own thread and won't be blocked by a blockage to the main event loop by the camera.
Note I've not tried using enableReaderMode
with camera operations, I just always use it for NFC operations because it is a better method of working with NFC.
QUESTION
I'm writing this.
...ANSWER
Answered 2021-Feb-11 at 06:07Two problems:
- You need to invoke a method/package within that module. You're calling the module at the moment.
QUESTION
I'm learning assembly and starting with linux x86. I'm now trying to create a reverse shell but I'm facing a segfault and i don't know where it is. Here's my assembly code :
...ANSWER
Answered 2020-Nov-11 at 21:17Your strace
output makes the problem clear: connect
returns an error code (between -4095
to -1
), so the high bytes of EAX are 0xffffff..
. Later mov al, imm8
1 leaves them unmodified, resulting in EAX= invalid system call number2.
If you want to make it exit cleanly even if an earlier system call returned negative, xor eax,eax
/ inc eax
/ int 0x80
at the end to do a SYS_exit. (With BL=1 or some non-zero value to exit with a non-zero status).
Or use push 0xb
/ pop eax
to set EAX=SYS_execve for that final system call, so the shell definitely runs. (But with stdin not redirected, so that's not very good).
Or just get used to using strace
as error checking, now that you understand what happens when a system call return value leaves the high bytes of EAX non-zero. You could put a ud2
at the end so it will exit with an illegal instruction instead of segfault (when execution falls into 00 00 add [eax], al
bytes.)
Or if you really want, write actual error checking for the connect
system call, checking for a negative EAX and using write
to output an error message before exiting. That would obviously be useless in real shellcode which would run with its stdout connected to something on the victim computer, not yours. connect
is the one most likely to fail, so you can still leave the other syscalls unchecked other than by strace
.
Footnote 1: Remember you're using mov al, 0xb
instead of mov eax, 0xb
to avoid zeros in your machine code, although push 0x0100007F
doesn't do that. >.< Not a problem when building as an executable, but would be a problem for injection via a strcpy or other C-string buffer overflow vulnerability.
Footnote 2: Apparently strace or the kernel is sign-extending that to 64 bits, despite the fact that the full RAX isn't accessible in 32-bit mode.
QUESTION
Please be nice, i am a baby futur developer.
I am creating a (fake) website to book bikes in Toulouse (France). I want to save in the session storage the name of the bike-station the user choose, because i need to show it after the bike booking.
Problem: The bike station name return by the devaux API is OK. I display it #station-name. I save it in the session storage. But when i try to collect it after -> undefined
Everything is OK for the name and forename (save in the localstorage).
Can you help me please ?
https://github.com/ldoba/project-03
HTML
...ANSWER
Answered 2020-Sep-23 at 13:56you are setting item to session storage whereas you are trying to get it from localStorage. that's why either use localStorage or sessionStorage
let stationNom = localStorage.getItem('station-name');
change it to
let stationNom = sessionStorage.getItem('station-name');
QUESTION
I'm brand new to machine learning and tensorflow, so I'm working on a personal project right now to try to learn a bit. I'm getting this error right now, and all of my research online hasn't helped me narrow the problem down exactly. My best guess is that there's something going on under the hood that I can't recognize that's making my loss function non-differentiable, which I know is a problem for RNNs. I appreciate any help!
...ANSWER
Answered 2020-Jun-12 at 07:42You get this error when you pass only the training data and missed to pass the labels in model.fit()
. I was able to recreate your error using below code. You can download the dataset I am using in the program from here. I am using Tensorflow version 2.2.0
.
Code to recreate the issue -
QUESTION
i've wrote a function with a simple for loop in R after a while someone propose to me an other way to do the same thing bu with dplyr and after i tryed i saw a strong difference in the time used to run my script (- 1s !). I'm wondering where come this huge difference of time used. is dplyr just way more optimized ? is dplyr compiled in a sort of way that speed up the process ? i dont't know
my original function
...ANSWER
Answered 2020-Apr-11 at 12:27For sure you should never write a loop yourself through a data.frame. There are a lot of packages and functions you can use to manipulate data in R.
I see that you are only at the beginning of your R journey. It is a wonderly advanture my friend.
QUESTION
I need some advice concerning this coding exercise:
Write a function that splits a string into words. Separators will all be non-alphanumeric characters. The function returns an array in which each cell contains the address of a string (representing a word). The last cell must be NULL to terminate the array.
Two things I need help are : How does my function make a proper return of the array to my main function and does the malloc array is used properly ?
I think I've missed up the pointer parts because there are errors showing up during compilation. If you have any idea, please let me know, thanks !
...ANSWER
Answered 2020-Mar-19 at 17:12It seems to work. Note that the code assume str
is not NULL
.
QUESTION
I would like to check if a directory exists (and create it if not), without having to declare the directory.
...ANSWER
Answered 2020-Mar-10 at 16:18I'm sure this question has been asked before on stackoverflow, but here you go.
Borrowed from comment by MrBean
QUESTION
I am trying to implement a basic example of Flamingo, a Windows-like ribbon emulator for Java apps, but I am stuck. The first band is correctly displayed, but in the second one the text "Edition" is displayed - not its components - and when I click on it it is displayed again under the first "Edition" band, and again, etc. It seems it has a reference on itself, although the code is the same as for the first band.
Here is my code:
...ANSWER
Answered 2017-Dec-16 at 15:08You're calling setResizePolicies on all three bands and pass only IconRibbonBandResizePolicy - which is the one that forces the ribbon band into iconified state.
Then you reconfigure bnd_store with two resize policies - none and iconified, which makes its content visible. But the other two remain iconified.
There's a bug there in Flamingo that allows calling setResizePolicies with only iconified policy. This is tracked by https://github.com/kirill-grouchnikov/flamingo/issues/17
QUESTION
I'm studying Node.js and i can'y find any solution.. my consol send me many messages an one is more particulary strange : GET/signup - - ms - - has someone any idea about that ? Thanks in advance !
...ANSWER
Answered 2019-Mar-04 at 17:27It appears you are trying to access MongoDB's admin database and insert something which is not allowed. I am assuming you are using a connection string like:
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