First Off I have a File That Looks Like This:
//Manager Ids
ManagerName: FirstName_LastName
ManagerLoginId: 12345
And a Text Box That has a five digit code(ex. 12345) That gets entered. When the Enter Key Is pressed it is assigned to a String called: "EnteredEmployeeId", Then What I need is to search the Entire file above for "EnteredEmployeeId" and if it matches then it will open another page, if it doesn't find that number then display a message(That tells you no employee Id found).
So essentially Im trying to open a file search the entire document for the Id then return true or false to allow it too either display an error or open a new page, and reset the EnteredEmployeeId to nothing.
My Code So Far:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace Rent_a_Car
{
public partial class Employee_Login_Page : Form
{
public Employee_Login_Page()
{
InitializeComponent();
}
string ManagersPath = #"C:\Users\Name\Visual Studios Project Custom Files\Rent A Car Employee Id's\Managers\Manager_Ids.txt"; //Path To Manager Logins
string EnteredEmployeeId;
private void textBox1_TextChanged(object sender, EventArgs e)
{
}
private void Employee_Id_TextBox_KeyPress(object sender, KeyPressEventArgs e)
{
if (!char.IsControl(e.KeyChar) && !char.IsDigit(e.KeyChar) && //Checks Characters entered are Numbers Only and allows them
(e.KeyChar != '0'))
{
e.Handled = true;
}
else if (e.KeyChar == (char)13) //Checks if The "Enter" Key is pressed
{
EnteredEmployeeId = Employee_Id_TextBox.Text; //Assigns EnteredEmployeeId To the Entered Numbes In Text Box
bool result = ***IsNumberInFile***(EnteredEmployeeId, "ManagerLoginId:", ManagersPath);
if (result)
{
//open new window
}
else
{
MessageBox.Show("User Not Found");
}
}
}
}
}
This function will read through whole file and find if there is inserted code. It will work with strings (as it is output of your text box) and will return only true or false (employee is or is not in file) not his name, surname etc.
static bool IsNumberInFile(string numberAsString, string LineName, string FileName)
{
var lines = File.ReadAllLines(FileName);
foreach(var line in lines)
{
var trimmedLine = line.Replace(" ", ""); //To remove all spaces in file. Not expecting any spaces in the middle of number
if (!string.IsNullOrEmpty(trimmedLine) && trimmedLine.Split(':')[0].Equals(LineName) && trimmedLine.Split(':')[1].Equals(numberAsString))
return true;
}
return false;
}
//Example of use
String ManagersPath = #"C:\Users\Name\Visual Studios Project Custom Files\Employee Id's\Managers\Manager_Ids.txt"; //Path To Manager Logins
String EnteredEmployeeId;
private void textBox1_TextChanged(object sender, EventArgs e)
{
}
private void Employee_Id_TextBox_KeyPress(object sender, KeyPressEventArgs e)
{
if (!char.IsControl(e.KeyChar) && !char.IsDigit(e.KeyChar) && //Checks Characters entered are Numbers Only and allows them
(e.KeyChar != '0'))
{
e.Handled = true;
}
else if (e.KeyChar == (char)13) //Checks if The "Enter" Key is pressed
{
EnteredEmployeeId = Employee_Id_TextBox.Text; //Assigns EnteredEmployeeId To the Entered Numbes In Text Box
bool result = IsNumberInFile(EnteredEmployeeId, "ManagerLoginId" , ManagersPath)
if(result)
//User is in file
else
//User is not in file
}
}
}
Short answer
Is your question about how to read your file?
private bool ManagerExists(int managerId)
{
return this.ReadManagers().Where(manager => manager.Id == managerId).Any();
}
private IEnumerable<Manager> ReadManagers()
{
using (var reader = System.IO.File.OpenText(managersFileName))
{
while (!reader.EndOfStream)
{
string lineManagerName = reader.ReadLine();
string lineMangerId = reader.ReadLine();
string managerName = ExtractValue(lineManagerName);
int managerId = Int32.Parse(ExtractValue(lineManagerId));
yield return new Manager
{
Id = managerId,
Name = managerName,
}
}
}
private string ExtractValue(string text)
{
// the value of the read text starts after the space:
const char separator = ' ';
int indexSeparator = text.IndexOf(separator);
return text.SubString(indexSeparator + 1);
}
Long Answer
I see several problems in your design.
The most important thing is that you intertwine your manager handling with your form.
You should separate your concerns.
Apparently you have the notion of a sequence of Managers, each Manager has a Name (first name, last name) and a ManagerId, and in future maybe other properties.
This sequence is persistable: it is saved somewhere, and if you load it again, you have the same sequence of Managers.
In this version you want to be able to see if a Manager with a given ManagerId exists. Maybe in future you might want more functionality, like fetching information of a Manager with a certain Id, or Fetch All managers, or let's go crazy: Add / Remove / Change managers!
You see in this description I didn't mention your Forms at all. Because I separated it from your Forms, you can use it in other forms, or even in a class that has nothing to do with a Form, for instance you can use it in a unit test.
I described what I needed in such a general from, that in future I might even change it. Users of my persistable manager collection wouldn't even notice it: I can put it in a JSON file, or XML; I can save the data in a Dictionary, a database, or maybe even fetch it from the internet.
All that users need to know, is that they have to create an instance of the class, using some parameters, and bingo, you can fetch Managers.
You also give users the freedom to decide how the data is to be saved: if they want to save it in a JSON file, changes in your form class will be minimal.
An object that stores sequences of objects is quite often called a Repository.
Let's create some classes:
interface IManager
{
public int Id {get;}
public string Name {get; set;}
}
interface IManagerRepository
{
bool ManagerExists(int managerId);
// possible future extensions: Add / Retrieve / Update / Delete (CRUD)
IManager Add(IManager manager);
IManager Find(int managerId);
void Update(IManager manager);
void Delete(int ManagerId);
}
class Manager : IManager
{
public Id {get; set;}
public string Name {get; set;}
}
class ManagerFileRepository : IManagerRepository,
{
public ManagerFileRepository(string fileName)
{
// TODO implement
}
// TODO: implement.
}
The ManagerFileRepository saves the managers in a file. It hides for the outside world how the file is internally structured. It could be your file format, it could be a CSV-file, or JSON / XML.
I also separated an interface, so if you later decide to save the data somewhere else, for instance in a Dictionary (for unit tests), or in a database, users of your Repository class won't see the difference.
Let's first see if you can use this class.
class MyForm : Form
{
const string managerFileName = ...
private IManagerRepository ManagerRepository {get;}
public MyForm()
{
InitializeComponent();
this.ManagerRepository = new ManagerFileRepository(managerFileName);
}
public bool ManagerExists(int managerId)
{
return this.ManagerRepository.ManagerExists(managerId);
}
Now let's handle your keyPress:
private void Employee_Id_TextBox_KeyPress(object sender, KeyPressEventArgs e)
{
TextBox textBox = (TextBox)sender;
... // code about numbers and enter key
int enteredManagerId = Int32.Parse(textBox.Text);
bool managerExists = this.ManagerExists(enteredManagerId);
if (managerExists) { ... }
}
This code seems to do what you want in an easy way. It looks transparent. The managerRepository is testable, reusable, simple to extend or change, because users won't notice this. So the class looks good. Let's implement
Implement ManagerFileRepository
There are several ways to implement reading the file:
(1) Read everything at construction time
and keep the read data in memory. If you add Managers they are not saved until you say so. Advantages: after initial startup it is fast. You can make changes and later decide not to save them anyway, so it is just like editing any other file. Disadvantage: if your program crashes, you have lost your changes.
(2) Read the file every time you need information
Advantage: data is always up-to-date, even if others edited the file while your program runs. If you change the manager collection it is immediately saved, so other can use it.
Which solution you choose depends on the size of the file and the importance of never losing data. If you file contains millions of records, then maybe it wasn't very wise to save the data in a file. Consider SQLite to save it in a small fairly fast database.
class ManagerFileRepository : IManagerRepository, IEnumerable<IManager>
{
private readonly IDictionary<int, IManager> managers;
public ManagerFileRepository(string FileName)
{
this.managers = ReadManagers(fileName);
}
public bool ManagerExists(int managerId)
{
return this.Managers.HasKey(managerId);
}
private static IEnumerable<IManager> ReadManagers(string fileName)
{
// See the short answer above
}
}
Room for improvement
If you will be using your manager repository for more things, consider to let the repository implement ICollection<IManager> and IReadOnlyCollection<IManager>. This is quite simple:
public IEnumerable<IManager> GetEnumerator()
{
return this.managers.Values.GetEnumerator();
}
public void Add(IManager manager)
{
this.managers.Add(manager.Id, manager);
}
// etc.
If you add functions to change the manager collection you'll also need a Save method:
public void Save()
{
using (var writer = File.CreateText(FullFileName))
{
const string namePrefix = "ManagerName: ";
const string idPrefix = "ManagerLoginId: ";
foreach (var manager in managers.Values)
{
string managerLine = namePrefix + manager.Name;
writer.WriteLine(managerLine);
string idLine = idPrefix + manager.Id.ToString();
writer.WriteLine(idLine);
}
}
}
Another method of improvement: your file structure. Consider using a more standard file structure: CSV, JSON, XML. There are numerous NUGET packages (CSVHelper, NewtonSoft.Json) that makes reading and writing Managers much more robust.
Summary
Because you separated the concerns of persisting your managers from your form, you can reuse the manager repository, especially if you need functionality to Add / Retrieve / Update / Delete managers.
Because of the separation it is much easier to unit test your functions. And future changes won't hinder users of the repository, because they won't notice that the data has changed.
If your Manager_Ids.txt is in the following format, you can use File.ReadLine() method to traverse the text and query it.
ManagerName: FirstName_LastName1
ManagerLoginId: 12345
ManagerName: FirstName_LastName2
ManagerLoginId: 23456
...
Here is the demo that traverse the .txt.
string ManagersPath = #"D:\Manager_Ids.txt";
string EnteredEmployeeId;
private void textBox_id_KeyDown(object sender, KeyEventArgs e)
{
int counter = 0;
bool exist = false;
string line;
string str = "";
if (e.KeyCode == Keys.Enter)
{
EnteredEmployeeId = textBox_id.Text;
System.IO.StreamReader file =
new System.IO.StreamReader(ManagersPath);
while ((line = file.ReadLine()) != null)
{
str += line + "|";
if (counter % 2 != 0)
{
if (str.Split('|')[1].Split(':')[1].Trim() == EnteredEmployeeId)
{
str = str.Replace("|", "\n");
MessageBox.Show(str);
exist = true;
break;
}
str = "";
}
counter++;
}
if (!exist)
{
MessageBox.Show("No such id");
}
file.Close();
}
}
Besides, I recommend to use "xml", "json" or other formats to serialize the data. About storing the data in "xml", you can refer to the following simple demo.
<?xml version="1.0"?>
<Managers>
<Manager>
<ManagerName>FirstName_LastName1</ManagerName>
<ManagerLoginId>12345</ManagerLoginId>
</Manager>
<Manager>
<ManagerName>FirstName_LastName2</ManagerName>
<ManagerLoginId>23456</ManagerLoginId>
</Manager>
</Managers>
And then use LINQ to XML to query the id.
string ManagersPath = #"D:\Manager_Ids.xml";
string EnteredEmployeeId;
private void textBox_id_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Enter)
{
EnteredEmployeeId = textBox_id.Text;
XElement root = XElement.Load(ManagersPath);
IEnumerable<XElement> manager =
from el in root.Elements("Manager")
where (string)el.Element("ManagerLoginId") == EnteredEmployeeId
select el;
if(manager.Count() == 0)
{
MessageBox.Show("No such id");
}
foreach (XElement el in manager)
MessageBox.Show("ManagerName: " + (string)el.Element("ManagerName") + "\n"
+ "ManagerLoginId: " + (string)el.Element("ManagerLoginId"));
}
}
Related
I am working on an application which is going to show updated dollar and euro rates for Turkey. I want to print green and red arrows depending on if rates went up or down since the last time user opened the app. So my question is how can I get previous data and how can I compare them with the current data?
CODE-BEHIND;
namespace Subasi.A.M.D
{
public partial class MainPage : ContentPage
{
float banknoteSellingUSD = 0;
float banknoteBuyingUSD = 0;
public MainPage()
{
InitializeComponent();
if (Device.OS == TargetPlatform.iOS)
Padding = new Thickness(10, 50, 0, 0);
else if (Device.OS == TargetPlatform.Android)
Padding = new Thickness(10, 20, 0, 0);
else if (Device.OS == TargetPlatform.WinPhone)
Padding = new Thickness(30, 20, 0, 0);
}
private void Button_Clicked(object sender, EventArgs e)
{
XmlDocument doc1 = new XmlDocument();
doc1.Load("http://www.tcmb.gov.tr/kurlar/today.xml");
XmlElement root = doc1.DocumentElement;
XmlNodeList nodes = root.SelectNodes("Currency");
foreach (XmlNode node in nodes)
{
var attributeKod = node.Attributes["Kod"].Value;
if (attributeKod.Equals("USD"))
{
var GETbanknoteSellingUSD = node.SelectNodes("BanknoteSelling")[0].InnerText;
var GETbanknoteBuyingUSD = node.SelectNodes("BanknoteBuying")[0].InnerText;
//if (banknoteSellingUSD > float.Parse(GETbanknoteSellingUSD)) isusdup = false;
//else isusdup = true;
banknoteSellingUSD = float.Parse(GETbanknoteSellingUSD);
banknoteBuyingUSD = float.Parse(GETbanknoteBuyingUSD);
labelUSDBuying.Text = banknoteSellingUSD.ToString("0.00");
labelUSDSelling.Text = banknoteBuyingUSD.ToString("0.00");
}
var attributeKod1 = node.Attributes["Kod"].Value;
if (attributeKod1.Equals("EUR"))
{
var GETbanknoteSellingEU = node.SelectNodes("BanknoteSelling")[0].InnerText;
var GETbanknoteBuyingEU = node.SelectNodes("BanknoteBuying")[0].InnerText;
var banknoteSellingEU = float.Parse(GETbanknoteSellingEU);
var banknoteBuyingEU = float.Parse(GETbanknoteBuyingEU);
labelEUSelling.Text = banknoteSellingEU.ToString("0.00");
labelEUBuying.Text = banknoteBuyingEU.ToString("0.00");
}
}
}
}
}
print green and red arrows depending on if rates went up or down since the last time user opened the app
To achieve this, you will have to store the previous value. The easiest way may be to use the properties dictionary (see here). You can store simple properties within that.
You could capsule the behavior in a class
public class ExchangeCourseSource : IExchangeCourseSource
{
public ExchangeCourseSource(XmlDocument sourceDocument)
{
this.sourceDocument = sourceDocument;
}
public ExchangeCourse GetCourse(string currency)
{
// parse from XML (see your code)
}
}
class ExchangeCourse
{
public string Currency { get; set; }
public double ExchangeRate { get; set; }
public double Difference { get; set; }
}
and decorate this with a class that stores and retrieved the courses to and fro the properties dictionary
public class StoredExchangeCourseSourceDecorator : IExchangeCourseSource
{
public ExchangeCourseSource(IExchangeCourceSource source, Application application)
{
this.source = source;
this.application = application;
}
public ExchangeCourse GetCourse(string currency)
{
var exchangeCourse = source.GetCourse(currency);
if(HasStoredCourse())
{
var storedCourse = GetStoredCourse(currency);
exchangeCourse.Difference = exchangeCourse.ExchangeRate - storedCourse;
}
StoreCourse(exchangeCourse);
return exchangeCourse;
}
private bool HasStoredCourse(string currency)
{
return application.Properties.ContainsKey(currency);
}
private double GetStoredCourse(string currency)
{
return (double)application.Properties[currency];
}
private void StoreCourse(ExchangeCourse exchangeCourse)
{
application.Properties[exchangeCourse.Currency] = exchangeCourse.ExchangeRate;
application.SavePropertiesAsync().Wait();
}
}
OK, so to answer the question, You have to store data somewhere, the easiest method will be in ISharedPreferences to save and restore data.
From AndroidDeveloper :
If you don't need to store a lot of data and it doesn't require
structure, you should use SharedPreferences. The SharedPreferences
APIs allow you to read and write persistent key-value pairs of
primitive data types: booleans, floats, ints, longs, and strings.
The key-value pairs are written to XML files that persist across user
sessions, even if your app is killed. You can manually specify a name
for the file or use per-activity files to save your data.
So it's a good place to store some info and retrieve them.
All you have to do is to get an instance from ISharedPreferences and use ISharedPreferencesEditor to insert and retrieve data.
You find it in Android.Content Namespace
To save your data you can apply this code :
ISharedPreferences preference = PreferenceManager.GetDefaultSharedPreferences(this);
ISharedPreferencesEditor editor = preference.Edit();
editor.PutString("key", "Value");
editor.Apply();
In your case, you can PutFloat
So your data which is "Value" is saved with a key named "key" is now saved
then you can retrieve data by :
ISharedPreferences preference = PreferenceManager.GetDefaultSharedPreferences(this);
var a = preference .GetString("key", "null");//"null" is the default value if the value not found. and the key, it to retrieve a specific data as we stored the data with the key named "key"
In your case, use GetFloat
So you get your value stored in a variable a.
All you have to do is : Store your data in the Sharedpreference when a new data changed or OnSleep() method which will be called when the app closed, then in OnCreate() method in your app, call the data saved in the SharedPreference and compare it with the new data.
So, I read a text file. It looks like this:
TEACHER - TEACHER/STUDENT
adamsmith - ID
Adam Smith - Name
B1u2d3a4 - Password
STUDENT
marywilson
Mary Wilson
s1Zeged
TEACHER
sz12gee3
George Johnson
George1234
STUDENT
sophieb
Sophie Black
SophieB12
And so on, there are all the users.
The user class:
class User
{
private string myID;
private string myName;
private string myPW;
private bool isTeacher;
public string ID
{
get
{
return myID;
}
set
{
myID = value;
}
}
public string Name
{
get
{
return myName;
}
set
{
myName = value;
}
}
public string PW
{
get
{
return myPW;
}
set
{
PW = value;
}
}
public bool teacher
{
get
{
return teacher;
}
set
{
isTeacher = value;
}
}
public override string ToString()
{
return myName;
}
}
The Form1_Load method:
private void Form1_Load(object sender, EventArgs e)
{
List<User> users = new List<User>();
string line;
using (StreamReader sr = new StreamReader("danet.txt"))
{
while ((line=sr.ReadLine())!=null)
{
User user = new User();
user.ID=line;
user.Name=sr.ReadLine();
user.PW=sr.ReadLine();
if(sr.ReadLine=="TEACHER")
{
teacher=true;
}
else
{
teacher=false;
}
users.Add(user);
}
}
}
I want to read the text and store the informations. By this method I get 4 times more user than I should. I was thinking of using for and a couple of things, but I didn't get to a solution.
New answer
Your reader assumes the every fourth line is the user-id, it is not, the absolute first line is a STUDENT/TEACHER line. Either this is a typo, or you have to change your format.
Your PW property will cause a StackOverflowException,
public string PW
{
get
{
return myPW;
}
set
{
PW = value;
}
}
Change the setter to myPW = value;, or just convert them to auto-properties.
Your teacher property has the same error, but on the getter.
You have also missed the () on one of your ReadLine's, but let's just assume this is a typo.
Not using a text-file, but just a string so I'm using a StringReader instead, but it's the same concept.
string stuff =
#"adamsmith
Adam Smith
B1u2d3a4
STUDENT
marywilson
Mary Wilson
s1Zeged
TEACHER
sz12gee3
George Johnson
George1234
STUDENT
sophieb
Sophie Black
SophieB12
STUDENT";
public void Main(string[] args)
{
string line;
var users = new List<User>();
using (var sr = new StringReader(stuff))
{
while ((line = sr.ReadLine()) != null)
{
User user = new User();
user.ID = line;
user.Name = sr.ReadLine();
user.PW = sr.ReadLine();
user.teacher = sr.ReadLine() == "TEACHER";
users.Add(user);
}
}
}
Old answer
There is nothing inherently erroneous with you code. But since you have not provided an actual example of what your "danet.txt" looks like, one must assume the error lies within the data itself.
Your "parser" (if you want to call it that) is not forgiving, i.e. if there is an empty line in your source file or if you just mess up one line (say forget putting in a password or ID) then everything would get offset – but as far as your "parser" is concerned, nothing is wrong.
By default formats which depend on "line positions" or "line offset" are prone to break, especially if the file itself is created by hand versus being auto-generated.
Why not use a denoted format instead? Such as XML, JSON or even just INI. C# can handle either of these, either built in or by external libraries (see the links).
There will never be any way for your "line-by-line" parser to not break if the user makes a faulty input, that is unless you have very strict formats for IDs, names, passwords and "student/teachers". and then validate them, using regular expressions (or similar). But that would defeat the purpose of a simple "line-by-line" format. And by then, you might as well go with a more "complex" format.
while ((line=sr.ReadLine())!=null)
{
User user = new User();
for (int i = 0; i < 4; i++)
{
switch (i)
{
case 1:
user.ID = line;
break;
case 2:
user.Name=sr.ReadLine();
break;
....
}
}
}
How do I code the whole list into the text file with commas in between each bit of data? Currently it is creating the file newData, but it is not putting in the variables from the list. Here is what I have so far.
public partial class Form1 : Form {
List<string> newData = new List<string>();
}
Above is where I create my list. Below is where I am reading it from.
private void saveToolStripMenuItem_Click(object sender, EventArgs e) {
TextWriter tw = new StreamWriter("NewData.txt");
tw.WriteLine(newData);
buttonSave.Enabled = true;
textBoxLatitude.Enabled = false;
textBoxLongtitude.Enabled = false;
textBoxElevation.Enabled = false;
}
And below is where the variables are coming from.
private void buttonSave_Click(object sender, EventArgs e) {
newData.Add (textBoxLatitude.Text);
newData.Add (textBoxLongtitude.Text);
newData.Add (textBoxElevation.Text);
textBoxLatitude.Text = null;
textBoxLongtitude.Text = null;
textBoxElevation.Text = null;
}
While you can use String.Join as others have mentioned they're ignoring three important things:
The fact that what you're really trying to do is write a comma-separated values file
The input that you're receiving and whether or not it will have commas in it
If you sanitize your input, what the current culture on the thread is when you write it out to the file
You want to write a comma-delimited file. There's no standardized format for this, but you do have to be careful of string content, especially in your case, where you're getting user input. Consider the following input:
latitude = "39,41"
longitude = "41,20"
There are a number of countries where the comma is used as a decimal separator, so this kind of input is very possible, depending on how distributed your application is (I'd be even more concerned if this was a website, personally).
And when getting the elevation, it's absolutely possible in most other places that use a comma as the thousands separator:
elevation = 20,000
In all of the other answers, your output for the line in the file will be:
39,41,41,20,20,000
Which when parsed (assuming it will be parsed, you're creating a machine-readable format) will fail.
What you want to do is parse the content first into a decimal and then output that.
Assuming you sanitize your input like so:
decimal latitude = Decimal.Parse(textBoxLatitude.Text);
decimal longitude = Decimal.Parse(textBoxLongitude.Text);
decimal elevation = Decimal.Parse(textBoxElevation.Text);
You would then format the values so that there are no commas (if you want).
To that end, I really recommend that you want to use a dedicated CSV writer/parser (try ServiceStack's serializer on NuGet, or others, if you prefer), which accounts for commas within the content you want separated by commas.
private void saveToolStripMenuItem_Click(object sender, EventArgs e)
{
TextWriter tw = new StreamWriter("NewData.txt");
tw.WriteLine(String.Join(", ", newData));
// Add appropriate error detection
}
In response to the discussion in both main answer threads, here is an example from my older code of a more robust way to handle CSV output:
The above not checked for syntax, but the key concept is String.Join.
public const string Quote = "\"";
public static void EmitCsvLine(TextWriter report, IList<string> values)
{
List<string> csv = new List<string>(values.Count);
for (var z = 0; z < values.Count; z += 1)
{
csv.Add(Quote + values[z].Replace(Quote, Quote + Quote) + Quote);
}
string line = String.Join(",", csv);
report.WriteLine(line);
}
This could be made slightly more general with an IEnumerable<object> but in the code I took this form, I didn't have the need to.
You cannot output the list just by calling tw.WriteLine(newData);
But something like this will achieve that:
tw.WriteLine(string.Join(", ", newData));
you could:
StringBuilder b = new StringBuilder();
foreach (string s in yourList)
{
b.Append(s);
b.Append(", ");
}
string dir = "c:\mypath";
File.WriteAllText(dir, b.ToString());
You have to iterate the List (not tested) or use string.Join, as the other users suggested (you need to convert your list to an array then)
private void saveToolStripMenuItem_Click(object sender, EventArgs e)
{
TextWriter tw = new StreamWriter("NewData.txt");
for (int i = 0; i < newData.Count; i++)
{
tw.Write(newData[i]);
if(i < newData.Count-1)
{
tw.Write(",");
}
}
tw.close();
buttonSave.Enabled = true;
textBoxLatitude.Enabled = false;
textBoxLongtitude.Enabled = false;
textBoxElevation.Enabled = false;
}
I am using android SDK with Microsoft VS2010 C#. I want to use string values from my /resources/values/strings file in my C# code. Here is a piece of code that illustrates what I want to do. I am not getting the string value. I know that the resource id is an int, but what I need is the actual string value behind that id.
void vx2OkButton_Click(object sender, EventArgs e)
{
Log.Info(LOG_TAG, "Hello from OkButton|Enter()button"); // also used as Enter button
strVx20kButtonText = vx2OkButton.Text.ToString();
mDwnLdCodeEnteredByUser = vxxDwnldCodeEntered.Text.Trim();
string strDwnldCodeOut = mActCode.Bad.ToString();
if(strVx20kButtonText == Resource.String.Enter.ToString())
{
if (mDwnLdCodeEnteredByUser.Length < 1)
{
vxxSystemMsgBox.SetText(Resource.String.FieldRequried_);
m_txvEnterDwnLdCode.SetTextAppearance(this,Resource.Color.Red);
return;
}
// verify the dwnldcodeenter by the user matches the assigned to user when at the time the downloaded the app
mDwnLoadStatus = VerifyDwnLoadCode(mDwnLdCodeEnteredByUser);
if (mDwnLoadStatus == mDwnLdStatCode.BadDwnLdCode.ToString())
{
vxxSystemMsgBox.SetText(Resource.String.InvalidValueEntered);
m_txvEnterDwnLdCode.SetTextAppearance(this, Resource.Color.Red);
return;
}
mActionCD = mActCode.Ok.ToString();
vx2OkButton.SetText(Resource.String.OkButtonText);
vxxSystemMsgBox.SetText(Resource.String.ThanksPressOkButton);
m_txvEnterDwnLdCode.SetTextAppearance(this,Resource.Color.White);
return;
}
As you noticed, Resource.String.Enter is an integer generated for you that you can use to access the string resource. You can access it using the Android.Content.Res.Resources.GetString() method:
string enter = Resources.GetString(Resource.String.Enter);
I use iText5 for .NET to extract text from a PDF, by using below code.
private void button1_Click(object sender, EventArgs e)
{
PdfReader reader2 = new PdfReader("Scharfetter1969.pdf");
int pagen = reader2.NumberOfPages;
reader2.Close();
ITextExtractionStrategy its = new iTextSharp.text.pdf.parser.SimpleTextExtractionStrategy();
for (int i = 1; i < 2; i++)
{
textBox1.Text = "";
PdfReader reader = new PdfReader("Scharfetter1969.pdf");
String s = PdfTextExtractor.GetTextFromPage(reader, i, its);
s = Encoding.UTF8.GetString(ASCIIEncoding.Convert(Encoding.Default, Encoding.UTF8, Encoding.Default.GetBytes(s)));
textBox1.Text = s;
reader.Close();
}
}
But I want to get bibliographic data from research paper pdf.
Here is example of data which is extrected from this pdf (in endnote format), Here's a link!
%0 Journal Article
%T Repeated temperature modulation epitaxy for p-type doping and light-emitting diode based on ZnO
%A Tsukazaki, A.
%A Ohtomo, A.
%A Onuma, T.
%A Ohtani, M.
%A Makino, T.
%A Sumiya, M.
%A Ohtani, K.
%A Chichibu, S.F.
%A Fuke, S.
%A Segawa, Y.
%J Nature Materials
%V 4
%N 1
%P 42-46
%# 1476-1122
%D 2004
%I Nature Publishing Group
But remember that this is bibliographic information, it is not available in metadata of this pdf. I want to access Article Type (%O), Title (%T), Authors (%A), Date (%D) and (%I) and show it to different assigned textbox in window form.
I am using C# if any one have any code for this, or guide me how to do this.
PDF is a one-way format. You put data in so that it renders consistently on all devices (monitors, printers, etc) but the format was never intended to pull data back out. Any and all attempts to do that will be pure guess work. iText's PdfTextExtractor works but you are going to have to piece things together based on your own arbitrary set of rules, and these rules will probably change from PDF to PDF. The supplied PDF was created by InDesign which does such a great job of making text look good that it actually makes it even harder to parse the data back out.
That said, if your PDFs are all visually consistent, you could try to pull the data out while retaining formatting and use the formatting rules to guess what is what. That post will get you some HTML formatting that you could guess at. (If this actually works I'd recommend returning something more specific than HTML but I'll leave that up to you.)
Running it against your supplied PDF shows that the title is using the font HelveticaNeue-LightExt at about 17pts so you could write a rule to look for all lines that use that font at that size and combine them together. Authors are done in HelveticaNeue-Condensed at about 10pts so that's another rule.
The below code is a modified version of the one linked to above. Its a full working C# 2010 WinForms app targeting iTextSharp 5.1.1.0. It pulls out the title and authors for the supplied PDF but you'll need to tweak it for other PDFs and meta data. See the comments in the code for specific implementation details.
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using iTextSharp.text.pdf.parser;
using iTextSharp.text.pdf;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
PdfReader reader = new PdfReader(System.IO.Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "nmat4-42.pdf"));
TextWithFontExtractionStategy S = new TextWithFontExtractionStategy();
string F = iTextSharp.text.pdf.parser.PdfTextExtractor.GetTextFromPage(reader, 1, S);
//Buffers to hold various parts from the PDF
List<string> titles = new List<string>();
List<string> authors = new List<string>();
//Array of lines of text
string[] lines = F.Split(new string[] { Environment.NewLine }, StringSplitOptions.None);
//Temporary string
string t;
//Loop through each line in the array
foreach (string line in lines)
{
//See if the line looks like a "title"
if (line.Contains("HelveticaNeue-LightExt") && line.Contains("font-size:17.28003"))
{
//Remove the HTML tags
titles.Add(System.Text.RegularExpressions.Regex.Replace(line, "</?span.*?>", "").Trim());
}
//See if the line looks like an "author"
else if (line.Contains("HelveticaNeue-Condensed") && line.Contains("font-size:9.995972"))
{
//Remove the HTML tags and trim extra characters
t = System.Text.RegularExpressions.Regex.Replace(line, "</?span.*?>", "").Trim(new char[] { ' ', ',', '*' });
//Make sure we have a valid name, probably need some more exceptions here, too
if (!string.IsNullOrWhiteSpace(t) && t != "AND")
{
authors.Add(t);
}
}
}
//Write out the title to the console
Console.WriteLine("Title : {0}", string.Join(" ", titles.ToArray()));
//Write out each author
foreach (string author in authors)
{
Console.WriteLine("Author : {0}", author);
}
Console.WriteLine(F);
this.Close();
}
public class TextWithFontExtractionStategy : iTextSharp.text.pdf.parser.ITextExtractionStrategy
{
//HTML buffer
private StringBuilder result = new StringBuilder();
//Store last used properties
private Vector lastBaseLine;
private string lastFont;
private float lastFontSize;
//http://api.itextpdf.com/itext/com/itextpdf/text/pdf/parser/TextRenderInfo.html
private enum TextRenderMode
{
FillText = 0,
StrokeText = 1,
FillThenStrokeText = 2,
Invisible = 3,
FillTextAndAddToPathForClipping = 4,
StrokeTextAndAddToPathForClipping = 5,
FillThenStrokeTextAndAddToPathForClipping = 6,
AddTextToPaddForClipping = 7
}
public void RenderText(iTextSharp.text.pdf.parser.TextRenderInfo renderInfo)
{
string curFont = renderInfo.GetFont().PostscriptFontName;
//Check if faux bold is used
if ((renderInfo.GetTextRenderMode() == (int)TextRenderMode.FillThenStrokeText))
{
curFont += "-Bold";
}
//This code assumes that if the baseline changes then we're on a newline
Vector curBaseline = renderInfo.GetBaseline().GetStartPoint();
Vector topRight = renderInfo.GetAscentLine().GetEndPoint();
iTextSharp.text.Rectangle rect = new iTextSharp.text.Rectangle(curBaseline[Vector.I1], curBaseline[Vector.I2], topRight[Vector.I1], topRight[Vector.I2]);
Single curFontSize = rect.Height;
//See if something has changed, either the baseline, the font or the font size
if ((this.lastBaseLine == null) || (curBaseline[Vector.I2] != lastBaseLine[Vector.I2]) || (curFontSize != lastFontSize) || (curFont != lastFont))
{
//if we've put down at least one span tag close it
if ((this.lastBaseLine != null))
{
this.result.AppendLine("</span>");
}
//If the baseline has changed then insert a line break
if ((this.lastBaseLine != null) && curBaseline[Vector.I2] != lastBaseLine[Vector.I2])
{
this.result.AppendLine("<br />");
}
//Create an HTML tag with appropriate styles
this.result.AppendFormat("<span style=\"font-family:{0};font-size:{1}\">", curFont, curFontSize);
}
//Append the current text
this.result.Append(renderInfo.GetText());
//Set currently used properties
this.lastBaseLine = curBaseline;
this.lastFontSize = curFontSize;
this.lastFont = curFont;
}
public string GetResultantText()
{
//If we wrote anything then we'll always have a missing closing tag so close it here
if (result.Length > 0)
{
result.Append("</span>");
}
return result.ToString();
}
//Not needed
public void BeginTextBlock() { }
public void EndTextBlock() { }
public void RenderImage(ImageRenderInfo renderInfo) { }
}
}
}