I have a very simple .csv file with ID's and serial numbers
the actual application will not know how many rows but will always have two columns
1,16600687
2,16600939
3,16604031
4,16607302
I have everything else setup but i am only loading the data into a 1D array and the comma is remaining in the data
The result i get is string value for 3rd position is 3,16604031
How do i separate this so it is a 2D array with get value [2,0] is 3 and get value [2,1] is 16604031 ?
private void button1_Click(object sender, EventArgs e)
{
string stFileNamenPath = "(put location of file here)";
DialogResult result = openFileDialog1.ShowDialog();
StreamReader sr = new StreamReader(stFileNamenPath);
string[] sortArray = null;
while (!sr.EndOfStream)
{
string strResult = sr.ReadToEnd();
sortArray = strResult.Split(new string[] { Environment.NewLine }, StringSplitOptions.None);
}
string stTest = (string)sortArray.GetValue(2);
MessageBox.Show("string value for 3rd position is " + stTest);
}
CSV file
1,16600687
2,16600939
3,16604031
4,16607302
The answer that comes to my mind is just a LINQ Where statement followed by a Select statement. The former for filtering and the second for actually remaping the data you have. You code would be something like this
string stFileNamenPath = "(put location of file here)";
//DialogResult result = openFileDialog1.ShowDialog();
StreamReader sr = new StreamReader(stFileNamenPath);
string[] sortArray = null;
while (!sr.EndOfStream)
{
string strResult = sr.ReadToEnd();
sortArray = strResult.Split(new string[] { Environment.NewLine }, StringSplitOptions.None);
}
char separator = ',';
var mappedArray = sortArray
.Where(x => !string.IsNullOrEmpty(x) && !string.IsNullOrWhiteSpace(x))
.Select(x => new string[] { x.Split(separator)[0], x.Split(separator)[1] }).ToArray();
var stTest = mappedArray[2][1];
MessageBox.Show("string value for 3rd position is " + stTest);
Related
I want to access a JSON of this structure in firebase
The structure
{
"questions":{
"English":{
"English_2002":[
{
"correct_ans":"A",
"OptionA":"a coder",
"OptionB":"a hacker",
"OptionC":"a writer",
"OptionD":"a programmer",
"Question":"Who build software"
},
{},
{}
],
"English_2003":[],
}
}
}
I want this structure. In the subject structure, other subjects will come after I exhaust 9 years of English.
My confusion is how to logically get each subject since firebase will only accept the root name questions.
Please I may sound dumb, but I have a very long questions thread almost 55000 lines. Because firebase accept one JSON tree.
Sorry i wasn't very clear i was asking from the stack phone app:
I have a question json tag of the structure above; my question is how will i be able to access the object subject like "english":{
// then accessing the first english array "english":[]
//since am now using firebase.
}
initially each array was individual json file, i have to recreate them into one for firebase sake. this is how i was parsing it then.
public class QuestionParser {
Context context;
public QuestionParser(Context c) {
this.context = c;
}
public ArrayList<Question> getJsonFromUrl(String url, String arrayName)
{
ArrayList<Question> arrayofQuestion = new ArrayList<>();
return arrayofQuestion;
}
// Processing question from JSon file in res > raw folder
public ArrayList<Question> parseQuestionJson(int rawJsonFileId, String arrayName) {
ArrayList<Question> questionList = new ArrayList<>();
String jsonstr = null;
try {
InputStream in = context.getResources().openRawResource(rawJsonFileId);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = br.readLine()) != null) {
sb.append(line + "\n");
}
jsonstr = sb.toString();
Log.d("REEEEADDD" + this.toString(), jsonstr);
//System.out.println(jsonstr);
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// If the JSON string is empty or null, then return early.
if (TextUtils.isEmpty(jsonstr)) {
return null;
}
try {
JSONObject jsonObject = new JSONObject(jsonstr);
JSONArray jsonArray = jsonObject.getJSONArray(arrayName);
JSONObject jobject;
for (int i = 0; i < jsonArray.length(); i++) {
// TEST
jobject = jsonArray.getJSONObject(i);
String ans = jobject.getString("correct_answer");
String graphic_name = jobject.getString("question_image");
String optionA = jobject.getString("optiona");
String optionB = jobject.getString("optionb");
String optionC = jobject.getString("optionc");
String optionD = jobject.getString("optiond");
String questionNo = jobject.getString("question_number");
String question = jobject.getString("question");
questionList.add(new Question(questionNo, graphic_name, question, optionA, optionB, optionC, optionD, ans));
Log.d("DDD" + this.toString(), String.valueOf(questionList.get(i)));
}
Log.i("ONE QUESTION", questionList.get(50).getQuestion());
} catch (Exception e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
return questionList;
}
}
So how can i parse it from firebase because initially, if a student chooses question and year i passes those value as parameter and use them for parsing. but in firebase now i have access to only root firebase name in the get reference e method
To access for example "correct_ans":"A" you would query your firebase like so:
your.firebase.domain/questions/English/English_2002/0/correct_ans
Notice that each level in the json object is represented by a / and the key you want to access whereas in case of an array you simple add the array index. JSON's simple structure also allows simple REST like access
I stored data from the database to ArrayList.and I get that data from ArrayList to write on excel file for users download purpose. when I write to excel file, it will write perfectly.but when I write more data the last line called "total" come inside the other lines.coding as below.
public String excel_missedcall(List<datefilter> result1){
Date date = new Date(System.currentTimeMillis());
String download_file="";
Properties prop = new Properties();
InputStream input = null;
String link="";
String linkfilepath="";
//read file name from properties file
try {
String filename = "config.properties";
input = MainController.class.getClassLoader().getResourceAsStream(
filename);
if (input == null) {
System.out.println("Sorry, unable to find " + filename);
}
// load a properties file from class path, inside static method
prop.load(input);
String filepath=prop.getProperty("missedcall_filePath");
download_file=filepath+"missedcall_"+date.getTime()+".xlsx";
link=prop.getProperty("missedcall_downloadfilePath");
linkfilepath=link+"missedcall_"+date.getTime()+".xlsx";
int total=0;
//create excel sheet
//Blank workbook
XSSFWorkbook workbook = new XSSFWorkbook();
//Create a blank sheet
XSSFSheet sheet= workbook.createSheet("Missedcall");
//This data needs to be written (Object[])
Map<String, Object[]> data = new TreeMap<String, Object[]>();
data.put("1", new Object[] {"Date", "TotalCalls"});
for(int i=0;i<result1.size();i++){
data.put(""+(i+2),new Object[] {result1.get(i).getMisscall_date(),Integer.parseInt(result1.get(i).getSum_misscall())});
total+=Integer.parseInt( result1.get(i).getSum_misscall());
//System.out.println("**********1*********"+(i+2));
}
data.put(""+(result1.size()+2), new Object[] {"Total", total});
//Iterate over data and write to sheet
Set<String> keyset = data.keySet();
int rownum = 0;
for (String key : keyset)
{
System.out.println("*********1**********"+key);
Row row = sheet.createRow(rownum++);
System.out.println("*********2**********"+rownum);
Object [] objArr = data.get(key);
int cellnum = 0;
for (Object obj : objArr)
{
Cell cell = row.createCell(cellnum++);
if(obj instanceof String)
cell.setCellValue((String)obj);
else if(obj instanceof Integer)
cell.setCellValue((Integer)obj);
}
}
try
{
//Write the workbook in file system
FileOutputStream out1 = new FileOutputStream(new File(download_file));
workbook.write(out1);
out1.close();
System.out.println("xlsx written successfully on disk.");
}
catch (Exception e)
{
e.printStackTrace();
}
} catch (Exception ex) {
ex.printStackTrace();
}
return linkfilepath;
}
Output of excel file is:
Date TotalCalls
2015-08-28 1895
2015-08-29 599
2015-08-30 354
2015-08-31 2028
Total 6712
2015-08-20 0
2015-08-21 0
2015-08-22 2
2015-08-23 12
2015-08-24 22
2015-08-25 324
2015-08-26 878
2015-08-27 598
Please help me.
You are using String as key , replace following line
Map<String, Object[]> data = new TreeMap<String, Object[]>();
with
Map<Integer, Object[]> data = new TreeMap<Integer, Object[]>();
I am working with csv file having very large dataset. while reading file i had extracted 4th place(BALANCE) ';' separated numeric value from each rows through while loop iteration. and make a list of Double after some mathematical calculation(here incremented).
now I want to store this list of Double in reverse order(from end to beginning).as its original position(here 4th place).example
public static void main(String[] args) throws IOException {
String filename = "abc.csv";
List<Double> list = new ArrayList<Double>();
File file = new File(filename);
Scanner inputStream = new Scanner(file);
inputStream.next();
while (inputStream.hasNext()) {
String data = inputStream.next();
String[] values = data.split(";");
double BALANCE = Double.parseDouble(values[1]);
BALANCE = BALANCE + 1;
ListIterator li = list.listIterator(list.size());
while (li.hasPrevious()) {
values[1] = String.valueOf(li.previous()); }
inputStream.close();
}
} }
You can use Collections.reverse. Example Collections.reverse(list);
I am using this piece of code to convert List into byte array but again I want to convert to this data into List how it is possible.
List<String> stringlist = new List<String>();
stringlist.Add("Oye Oye");
stringlist.Add("Hello hello");
byte[] byteArr = stringlist.SelectMany(s => System.Text.Encoding.UTF8.GetBytes(s)).ToArray();
In your example it isn't possible, because you have no way to tell where a string ends and where the next one starts. It would be possible by using a separator (the character \0 is often used to indicate the end of a string):
List<String> stringlist = new List<String>();
stringlist.Add("Oye Oye");
stringlist.Add("Hello hello");
byte[] byteArr = stringlist.SelectMany(s => System.Text.Encoding.UTF8.GetBytes(s + '\0').ToArray();
You can then retrieve your list by using the Split method:
var stringList = System.Text.Encoding.UTF8.GetString(byteArr, 0, byteArr.Length).Split('\0');
But overall I don't think it's a good idea. Depending on what you need, I'd rather recommend to use the DataContractSerializer to convert your array to bytes:
var serializer = new System.Runtime.Serialization.DataContractSerializer(typeof(List<string>));
byte[] byteArr;
using (var ms = new System.IO.MemoryStream())
{
serializer.WriteObject(ms, stringlist);
byteArr = ms.ToArray();
}
And to convert it back:
using (var ms = new System.IO.MemoryStream(byteArr))
{
stringlist = (Sserializer.ReadObject(ms);
}
I would like to parse this page
That page has json data like this :
{"List":[{"num":"1","name":"hello","ox_score":"30","between_score":"30","order_score":"30","total_score":"90"}]}
I tried below code.(I used JSON.NET) but I was concerend about "List" and I also tried JArray and... o["Lists"]["name"] but I couldn't get a right results. The below code also return null messages.
Please help me out.
code
public void connection()
{
string uriString = "http://kah601.cafe24.com/jp_mango_loadboard.php";
WebClient wc = new WebClient();
wc.Headers["Accept"] = "application/json";
wc.DownloadStringCompleted += new DownloadStringCompletedEventHandler(wc_DownloadStringCompleted);
wc.DownloadStringAsync(new Uri(uriString));
}
void wc_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
JObject o = JObject.Parse(e.Result);
String name = (string) o["name"];
String ox_score = (string) o["ox_score"];
String between_score = (string) o["between_score"];
String order_score = (string) o["order_score"];
String total_score = (string) o["total_score"];
String rank_result = name + ox_score + between_score + order_score + total_score;
MessageBox.Show(rank_result);
}
Given it is a list, you should index the elements of the JArray. Here is a sample code to help you out (Notice the [0] => referencing the 1st element of the JArray):
void wc_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
JObject o = JObject.Parse(e.Result);
JArray a = (JArray)o["List"];
Debug.WriteLine("{0}", (String)a[0]["name"]);
}