reader

Stream reader.Read number of character

由 让人想犯罪 __ 提交于 2021-02-11 07:26:32
问题 Is there any Stream reader Class to read only number of char from string Or byte from byte[] ? forexample reading string: string chunk = streamReader.ReadChars(5); // Read next 5 chars or reading bytes byte[] bytes = streamReader.ReadBytes(5); // Read next 5 bytes Note that the return type of this method or name of the class does not matter. I just want to know if there is some thing similar to this then i can use it. I have byte[] from midi File. I want to Read this midi file in C#. But i

How to get plain text from NFC Tag?

由 白昼怎懂夜的黑 提交于 2021-02-08 11:24:44
问题 I have tried to implement the code from Google documentation but it is still not clear for me. What am I missing here? This is method in MainActivity.java: @Override protected void onNewIntent(Intent intent) { super.onNewIntent(intent); if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(intent.getAction())) { Parcelable[] rawMessages = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES); if (rawMessages != null) { NdefMessage[] messages = new NdefMessage[rawMessages.length]; for (int i =

How to copy from slice to array with seeking onto slice

由 拟墨画扇 提交于 2021-02-08 03:44:25
问题 I'm writing a library to deal with a binary format. I have a struct with array vars, that I would like to keep for documentation purposes. I need also to seek and tell from the input slice of bytes. Some pseudocode: type foo struct { boo [5]byte coo [3]byte } func main() { // input is a []byte full of datas, read from a file var bar foo // Here i need something that writes 5 bytes to bar.foo from input bar.foo = somefunc(input, numberOfFoo) // ??? // I need also tell() and seek() input.seek(n

Java: Why is \n considered 2 characters in a read text file situation?

由 大城市里の小女人 提交于 2021-01-28 19:19:19
问题 import java.io.*; public class xxx { public static void main(String[] args) throws IOException { FileReader fs = new FileReader("xxx.txt"); int t = fs.read(); int count = 0; while (t!=-1) { count++; t = fs.read(); } System.out.println(count); } } Considering that xxx.txt contains: a b b cccd I'm just confused at why "next line" is considered 2 characters? I manually counted 10 characters (including white space) but the result is a 12. Thank you. 回答1: It is because windows uses 2 characters \r

Android camera2: java.lang.IllegalStateException: maxImages (1) has already been acquired, call #close before acquiring more

由 依然范特西╮ 提交于 2020-07-04 10:48:30
问题 Hello having trouble to fix this issue. I already have a imageReader.close called inside the ImageAvailable callback but still having the error: java.lang.IllegalStateException: maxImages (1) has already been acquired, call #close before acquiring more. Code I have is here: private ImageReader.OnImageAvailableListener imageAvailableListener = new ImageReader.OnImageAvailableListener() { @Override public void onImageAvailable(ImageReader reader) { Image img = mReader.acquireLatestImage();

How to use csv reader object multiple times

由 放肆的年华 提交于 2020-05-14 02:47:31
问题 I am doing a python project.I opened a new csv files and its contents are A | B ------------- 1. 200 | 201 2. 200 | 202 3. 200 | 201 4. 200 | 203 5. 201 | 201 6. 201 | 202 ........... And what I am doing is... def csvvalidation(readers): for row in readers: print row def checkduplicationcsv(reader): datalist = [] for row in reader: print row content = list(row[i] for i in range(0,3)) datalist.append(content) with open("new.csv", "rb") as infile: reader = csv.reader(infile) first_row = next

How to use csv reader object multiple times

由 喜夏-厌秋 提交于 2020-05-14 02:47:13
问题 I am doing a python project.I opened a new csv files and its contents are A | B ------------- 1. 200 | 201 2. 200 | 202 3. 200 | 201 4. 200 | 203 5. 201 | 201 6. 201 | 202 ........... And what I am doing is... def csvvalidation(readers): for row in readers: print row def checkduplicationcsv(reader): datalist = [] for row in reader: print row content = list(row[i] for i in range(0,3)) datalist.append(content) with open("new.csv", "rb") as infile: reader = csv.reader(infile) first_row = next

How to use csv reader object multiple times

由 我们两清 提交于 2020-05-14 02:47:05
问题 I am doing a python project.I opened a new csv files and its contents are A | B ------------- 1. 200 | 201 2. 200 | 202 3. 200 | 201 4. 200 | 203 5. 201 | 201 6. 201 | 202 ........... And what I am doing is... def csvvalidation(readers): for row in readers: print row def checkduplicationcsv(reader): datalist = [] for row in reader: print row content = list(row[i] for i in range(0,3)) datalist.append(content) with open("new.csv", "rb") as infile: reader = csv.reader(infile) first_row = next

字符输入输出流---抽象的字符输入流Reader类、抽象的字符输出流Writer类的使用总结

由 混江龙づ霸主 提交于 2020-02-08 20:24:37
前一篇总结了字节输入输出流的使用，这一篇是对字符输入输出流的总结。 利用字符流java.io.Reader、java.io.Writer类可以直接实现字符数组、字符串的输入、输出。这两个类都是抽象类，不能直接使用，需要使用其子类向上转型完成实例化后，才可以使用。 (1)、字符输入流Reader的常用方法： （在对中文数据进行读取时，可以直接使用字符输入流Reader类进行操作） 作用：将字符数据读入到数组中； public int read() throws IOException; //读取一个字符，返回范围是0-65535之间的int值，如果读到文件流的末尾返回-1； public int read(char[ ] cbuf) throws IOException; //读入多个字符到字符数组cbuf中，如果读到文件流的末尾返回-1； public int read(char[ ] cbuf,int off,int len) throws IOException;//读取len个字符存放到字符数组从off开始的位置中； public void mark(int readAheadLimit); //标记输入流的当前位置； public boolean markSupported(); //测试输入流是否支持mark()方法； public void reset(); /

datax小记

由 断了今生、忘了曾经 提交于 2020-02-04 13:42:05
datax是一个搬数据的框架，是阿里巴巴公司的开源的框架，主要就是用来搬数据，多数据源之间的数据的处理。 datax的使用： datax主要通过json文件来配置job，json的格式如下： { "job": { "content": [ { "reader": { "name": "streamreader", "parameter": { "column": [], "sliceRecordCount": "" } }, "writer": { "name": "streamwriter", "parameter": { "encoding": "", "print": true } } } ], "setting": { "speed": { "channel": "" } } } } 上面就是一个简单的job文件，可以看出一个job包含reader和writer两个部分，初次接触datax的json文件时，感觉跟spring-batch很相似，都是分为一个一个的job，而且都包含reader和writer。但是datax与batch是不一样的，datax只是一个搬数据的数据同步工具，而batch是批量处理工具，batch可以对读到的数据进行处理，而datax没有这个功能，只能转移数据，读到的数据是什么，写出来就是什么。 datax是一个支持拓展插件的框架
订阅 reader