lrc校验java代码 java入参校验

Message time out,该怎么解决

Modbus两种协议的编程方法:

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1、LRC校验

LRC域是一个包含一个8位二进制值的字节。LRC值由传输设备来计算并放到消息帧中,接收设备在接收消息的过程中计算LRC,并将它和接收到消息中LRC域中的值比较,如果两值不等,说明有错误。

LRC校验比较简单,它在ASCII协议中使用,检测了消息域中除开始的冒号及结束的回车换行号外的内容。它仅仅是把每一个需要传输的数据按字节叠加后取反加1即可。下面是它对应的代码:

BYTE GetCheckCode(const char * pSendBuf, int nEnd)//获得校验码

{

BYTE byLrc = 0;

char pBuf[4];

int nData = 0;

for(i=1; iend; i+=2) //i初始为1,避开“开始标记”冒号

{

//每两个需要发送的ASCII码转化为一个十六进制数

pBuf [0] = pSendBuf [i];

pBuf [1] = pSendBuf [i+1];

pBuf [2] = '\0';

sscanf(pBuf,"%x", nData);

byLrc += nData;

}

byLrc = ~ byLrc;

byLrc ++;

return byLrc;

}

2、CRC校验

CRC域是两个字节,包含一16位的二进制值。它由传输设备计算后加入到消息中。接收设备重新计算收到消息的CRC,并与接收到的CRC域中的值比较,如果两值不同,则有误。

CRC是先调入一值是全“1”的16位寄存器,然后调用一过程将消息中连续的8位字节各当前寄存器中的值进行处理。仅每个字符中的8Bit数据对CRC有效,起始位和停止位以及奇偶校验位均无效。

CRC产生过程中,每个8位字符都单独和寄存器内容相或(OR),结果向最低有效位方向移动,最高有效位以0填充。LSB被提取出来检测,如果LSB为1,寄存器单独和预置的值或一下,如果LSB为0,则不进行。整个过程要重复8次。在最后

java解析lrc文件代码

lrc可以通过如下util工具类进行转换,如果想知道结果是否读取的有问题,可以直接用记事本打开lrc文件的,之后和输出结果比对一下就行。

package com.routon.utils;

import java.io.BufferedReader;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.InputStreamReader;

import java.util.ArrayList;

import java.util.List;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import android.util.Log;

/**

* parse lrc file tool

* eg:

* utilLrc lrc = new utilLrc("/sdcard/test.lrc");

* get song name : String title = lrc.getTitle();

* get performer name : String artist = lrc.getArtist();

* get album name: String album = lrc.getAlbum();

* get lrcmaker name: String lrcMaker = lrc.getLrcMaker();

* get song list: ListStatement list = lrc.getLrcList();

*

* @author xuweilin

*

*/

public class utilLrc {

private static String TAG = "utilLrc";

public class Statement {

private double time = 0.0; //time, 0.01s

private String lyric = ""; //song word

/*

* get time

*/

public double getTime() {

return time;

}

/*

* set time

*/

public void setTime(double time) {

this.time = time;

}

/*

* set time.format:mm:ss.ms

*/

public void setTime(String time) {

String str[] = time.split(":|\\.");

this.time = Integer.parseInt(str[0])*60+Integer.parseInt(str[1])+Integer.parseInt(str[2])*0.01;

}

/*

* get lrc word

*/

public String getLyric() {

return lyric;

}

/*

* set lrc word

*/

public void setLyric(String lyric) {

this.lyric = lyric;

}

}

private BufferedReader bufferReader = null;

private String title = "";

private String artist = "";

private String album = "";

private String lrcMaker = "";

private ListStatement statements = new ArrayListStatement();

/*

*

* fileName

*/

public utilLrc(String fileName) throws IOException{

FileInputStream file = new FileInputStream(fileName);

bufferReader = new BufferedReader(new InputStreamReader(file, "utf-8"));

readData();

}

/*

* read the file

*/

private void readData() throws IOException{

statements.clear();

String strLine;

while(null != (strLine = bufferReader.readLine()))

{

if("".equals(strLine.trim()))

{

continue;

}

if(null == title || "".equals(title.trim()))

{

Pattern pattern = Pattern.compile("\\[ti:(.+?)\\]");

Matcher matcher = pattern.matcher(strLine);

if(matcher.find())

{

title=matcher.group(1);

continue;

}

}

if(null == artist || "".equals(artist.trim()))

{

Pattern pattern = Pattern.compile("\\[ar:(.+?)\\]");

Matcher matcher = pattern.matcher(strLine);

if(matcher.find())

{

artist=matcher.group(1);

continue;

}

}

if(null == album || "".equals(album.trim()))

{

Pattern pattern = Pattern.compile("\\[al:(.+?)\\]");

Matcher matcher = pattern.matcher(strLine);

if(matcher.find())

{

album=matcher.group(1);

continue;

}

}

if(null == lrcMaker || "".equals(lrcMaker.trim()))

{

Pattern pattern = Pattern.compile("\\[by:(.+?)\\]");

Matcher matcher = pattern.matcher(strLine);

if(matcher.find())

{

lrcMaker=matcher.group(1);

continue;

}

}

int timeNum=0;

String str[] = strLine.split("\\]");

for(int i=0; istr.length; ++i)

{

String str2[] = str[i].split("\\[");

str[i] = str2[str2.length-1];

if(isTime(str[i])){

++timeNum;

}

}

for(int i=0; itimeNum;++i)

{

Statement sm = new Statement();

sm.setTime(str[i]);

if(timeNumstr.length)

{

sm.setLyric(str[str.length-1]);

}

statements.add(sm);

}

}

sortLyric();

}

/*

* judge the string is or not date format.

*/

private boolean isTime(String string)

{

String str[] = string.split(":|\\.");

if(3!=str.length)

{

return false;

}

try{

for(int i=0;istr.length;++i)

{

Integer.parseInt(str[i]);

}

}

catch(NumberFormatException e)

{

Log.e(TAG, "isTime exception:"+e.getMessage());

return false;

}

return true;

}

/*

* sort the word by time.

*/

private void sortLyric()

{

for(int i=0;istatements.size()-1;++i)

{

int index=i;

double delta=Double.MAX_VALUE;

boolean moveFlag = false;

for(int j=i+1;jstatements.size();++j)

{

double sub;

if(0=(sub=statements.get(i).getTime()-statements.get(j).getTime()))

{

continue;

}

moveFlag=true;

if(subdelta)

{

delta=sub;

index=j+1;

}

}

if(moveFlag)

{

statements.add(index, statements.get(i));

statements.remove(i);

--i;

}

}

}

/**

* get title

* @return

*/

public String getTitle(){

return title;

}

/**

* get artist

* @return

*/

public String getArtist(){

return artist;

}

/**

* get album

* @return

*/

public String getAlbum(){

return album;

}

/**

* get lrc maker

* @return

*/

public String getLrcMaker(){

return lrcMaker;

}

/**

* get song list

* @return

*/

public ListStatement getLrcList(){

return statements;

}

}

请用java编程:

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

public class Lyric2Text {

public void doWork(String lyric) throws IOException{

BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(lyric), "utf8"));

BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(lyric.substring(0, lyric.lastIndexOf('.')) + ".txt"), "utf8"));

String line;

while((line = reader.readLine()) != null){

line = line.replaceAll("\\[[0-9:\\.]+\\]", "");

writer.write(line + "\n");

}

reader.close();

writer.close();

}

public static void main(String[] args) throws IOException {

Lyric2Text tmp = new Lyric2Text();

tmp.doWork("C:\\Users\\admin\\Desktop\\一帘幽梦.lrc");

}

}

c# 实现LRC校验码函数

byte[] code = { 0, 1, 0, 2, 0, 0, 0, 0, 0, 0, 0, 1 };

int sum = 0;

foreach (byte b in code)

{

sum += b;

}

sum =sum % 255;//模FF

sum = ~sum + 1;//取反+1

string lrc = Convert.ToString(sum, 16);

sum最后的结果是-5,转成16进制的字符串是fffffffc,因为sum是用int表示的,是32位的。


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