Split Java String in chunks of 1024 bytes

浪子不回头ぞ 提交于 2020-01-29 05:10:23
问题 What's an efficient way of splitting a String into chunks of 1024 bytes in java? If there is more than one chunk then the header(fixed size string) needs to be repeated in all subsequent chunks. 回答1: Strings and bytes are two completely different things, so wanting to split a String into bytes is as meaningless as wanting to split a painting into verses. What is it that you actually want to do? To convert between strings and bytes, you need to specify an encoding that can encode all the

String Hex to byte,

半腔热情 提交于 2020-01-26 04:04:07
问题 I'm struggling with an easy task. At least it looks like it should be, at first sight. I have a TextBox that contains HEX strings. They are always two hex digits in length (e.g. AA ). I want to convert textbox3.Text to a Byte . Here's what I have so far: Dim checking As String = textbox3.Text Dim a = Convert.ToByte(checking) RichTextBox1.Text = a.ToString But it throws a SystemFormatException . 回答1: The Convert.ToByte method provides an overload which takes a string argument followed by a

My webrequest is not working get 400 error message?

杀马特。学长 韩版系。学妹 提交于 2020-01-25 07:54:06
问题 My webrequest is not working? I got an error. The website where I'm doing this request is: can anyone help me perform this request? I'm stuck with getting error message HTTP 400 Bad Request. This is my method: using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Net; using System.Text; using System.Threading.Tasks; namespace MPRequest { class HttpMethods { public static string Get(string url, string

WebAuthn - byte length of the “credential public key”

↘锁芯ラ 提交于 2020-01-25 02:49:07
问题 In WebAuthn, the authenticator data contains the variable length attested credential data followed by the extensions , if any: The attested credential data is made variable because of the credential public key field which is a CBOR map. In case there are extensions, how to know in advance the byte length of this field, so that I can pass this field truncated without the extensions to a CBOR library? The CBOR library I am using doesn't seem to handle extra bytes, and I don't know CBOR enough

Python - Convert bytes / unicode tab delimited data to csv file

一个人想着一个人 提交于 2020-01-24 18:59:06
问题 I'm pulling the following line of data from an API. The data starts with a b prefix which would indicate according to the Python 3.3 documentation that we are dealing with "a bytes literal" with the escape sequences \t and \n representing the ASCII Horizontal Tab (TAB) and ASCII Linefeed (LF) respectively. b'settlement-id\tsettlement-start-date\tsettlement-end-date\tdeposit-date\ttotal-amount\tcurrency\ttransaction-type\torder-id\tmerchant-order-id\tadjustment-id\tshipment-id\tmarketplace

Node.js, protobuffer, buffer.lentgh.. how to send structured buffer/message trough tcp?

℡╲_俬逩灬. 提交于 2020-01-24 12:00:46
问题 I had wrote a node/ssjs program that makes: Tcp connection to data server(Apache MIMA), using TLS module. (OK) Encode/decode(serialize/deserialize) messages through protobuffer module.. (OK) Send serialized message to server and get response. (Not OK). The server´s manual types: Structure of message: [ Length | Header length | Header (| Body length |Body) ] Length – message length = fixed size (4 bytes). Note that this is only the size of following message (not the prefix itself); Header

Why is a string's byte size longer than the length? [closed]

∥☆過路亽.° 提交于 2020-01-24 02:19:26
问题 This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. Closed 6 years ago . Why is it that sizeof("Bill") is 5 but sizeof(char) is 1 ? Shouldn't that make sizeof("Bill") be 4 since the length of the string is 4 chars ( 4 x 1 )? I

C: Building a byte

时光总嘲笑我的痴心妄想 提交于 2020-01-23 19:44:21
问题 I have an array with 16 elements. I would like to evaluate these to a boolean 0 or 1 and then store this in 2 bytes so i can write to a binary file. How do I do this? 回答1: Something like this you mean? unsigned short binary = 0, i; for ( i = 0; i < 16; ++i ) if ( array[i] ) binary |= 1 << i; // the i-th bit of binary is 1 if array[i] is true and 0 otherwise. 回答2: You have to use bitwise operators. Here's an example: int firstBit = 0x1; int secondBit = 0x2; int thirdBit = 0x4; int fourthBit =

Converting 24 bit integer (2s complement) to 32 bit integer in C++

孤者浪人 提交于 2020-01-23 17:08:06
问题 The dataFile.bin is a binary file with 6-byte records. The first 3 bytes of each record contain the latitude and the last 3 bytes contain the longitude. Each 24 bit value represents radians multiplied by 0X1FFFFF This is a task I've been working on. I havent done C++ in years so its taking me way longer than I thought it would -_-. After googling around I saw this algorthim which made sense to me. int interpret24bitAsInt32(byte[] byteArray) { int newInt = ( ((0xFF & byteArray[0]) << 16) | (

How to get size of array in bytes in perl?

对着背影说爱祢 提交于 2020-01-21 20:24:25
问题 I need get size of array in perl, but size must to be in bytes. I can not find any function for this. Thanks in advance 回答1: You can do this using the Devel::Size module -> #!/usr/bin/perl use strict; use warnings; use Devel::Size qw(total_size); my @arr = (1, 2, 3, "Foo", "Bar", "Baz", [4, 5, 6], {xyz => 2048}); print "Size: ", total_size(\@arr), " bytes.\n"; On my system this prints: bria@hel:~$ ./ Size: 765 bytes. bria@hel:~$ 来源: https:/