i have created web application and using textbox and it can contains multiple line of data becoz i have set its textmode property is multiline.
my problem is that i want to check each line contain data or not so i using count variable which count how many line contain data.
string[] data;
int cntindex;
data = txt_invoicenumber.Text.ToString().Split("\n".ToCharArray());
cntindex = data.Length;
for (j = 0; j < cntindex; j++)
{
if (data[j]!="")
{
inv_count++;
}
}
Its not working.
Please help me.
I guess this is because new line is \r\n so there is a '\r' also on empty lines.
Change the if statement to:
if (data[j].Trim().Length != 0)
Firstly, You don't need to ToString() the .Text property as it is already a string.
try this
string[] lines = txt_invoicenumber.Text.Split(Environment.NewLine);
int lineCount = 0;
foreach(string line in lines)
{
if(!string.IsNullOrEmpty(line))
{
lineCount ++;
this.ProcessLine(line);
}
}
var lb = new String[] { "\r\n" };
var lines = txt_invoicenumber.Text.Split(lb, StringSplitOptions.None).Length;
This will count empty lines too. If you don't want to count empty lines, use the StringSplitOptions.RemoveEmptyEntries value.
Don't count 100% on "\r\n" if you have little control over your environment though.
This is the answer I came up with.
String[] lines = TextBox1.Text.Split(new Char[] { '\r', '\n' },
StringSplitOptions.RemoveEmptyEntries);
Int32 validLineCount = lines.Length;
Related
Lets Say this is My Text. Now I want to Extract All 4 Variable Separately from the text
"ScanCode=? scanMsg= ? ItemName=? ID= ?\n"
Please Help i need this is Dart, Flutter
The solution I developed first splits the data according to the space character. It then uses the GetValue() method to sequentially read the data from each piece. The next step will be to use the data by transforming it accordingly.
This example prints the following output to the console:
[ScanCode=1234, ScanMessage=Test, Itemname=First, ID=1]
[1234, Test, First, 1]
The solution I developed is available below:
void main()
{
String text = "ScanCode=1234 ScanMessage=Test ItemName=First ID=1";
List<String> original = text.split(' ');
List<String> result = [];
GetValue(original, result);
print(original);
print(result);
}
void GetValue(List<String> original, List<String> result)
{
for(int i = 0 ; i < original.length ; ++i)
{
result.insert(i, original[i].split('=')[1]);
}
}
using UnityEngine;
using System.Collections;
public class NewMonoBehaviour1 : MonoBehaviour
{
void ConcatExample(int[] intArray)
{
string line = intArray[0].ToString(); // the line is the var of the first in array
for(i =1;i <intArray.Length; i++) // the length is unknown ?
{
line += ", " + intArray[i].ToString(); //
}
return line;
//each time allocate new in original place
}
}
How can this function work ? the length of array is unknown , so how the for loop works ?Besides, this is void function but shouldn't return anythings right ,or is there any exceptional case ,finally,according to the unity manual, it is said that the function will keep producing a string but with new contents in the same place , resulting in consuming large memory space .Why ?thx
What makes you think that the Length should be unknown? It is a property that any array simply has
Gets the total number of elements in all the dimensions of the Array.
Of course it is not unknown the moment you call your method with an according parameter!
The return line; will not even compile since as you say the method is of type void so it can not return anything. It should probably be private string ConcatExample
Then what the unity manual (don't know where exactly you read this) means lies in
line += ", " + intArray[i].ToString();
under the hood every string in c# is an immutable char[]. So everytime you do a string concatenation via stringC = stringA + stringB what happens under the hood is basically something similar to
char[] stringC = new char[stringA.Length + stringB.Length];
for(var iA = 0; iA < stringA.Length; iA++)
{
stringC[i] = stringA[i];
}
for(var iB = 0; iB < stringB.Length; iB++)
{
stringC[iB + stringA.Length] = stringB[iB];
}
so whenever dealing with loops especially with large data it is strongly recommended to rather use a StringBuilder like
private string ConcatExample(int[] intArray)
{
var builder = new StringBuilder(intArray[0]);
for(i =1; i < intArray.Length; i++)
{
builder.Append(", ").Append(intArray[i].ToString());
}
return builder.ToString();
}
The length of the array will be the length of the array of ints you pass into the function as an argument.
say you pass it
Int[] ints = {1,2,3}
ConcatExample(ints); //the length of the array is now 3
add a debug.log() function to the ConcatExample method
void ConcatExample(int[] intArray)
{
string line = intArray[0].ToString();
for (int i = 1; i < intArray.Length; i++)
{
line += ", " + intArray[i].ToString(); //
Debug.Log(line);
}
}
debug.log would produce the following in the console
1, 2
1, 2, 3
and finally the return line; at the end would just result in an error because yes you are correct void returns nothing
This function CANNOT work, unless it gets the data it expects. A NULL passed to this function, for example, would generate a runtime null-reference exception. Passing a valid integer array, of length zero would generate an invalid index error on the first line.
You are correct, the function returns nothing, and appears pointless. In fact, I would have expected return line; to generate a complier error.
The string type appears "dynamic" meaning, it will indeed allocate more and more memory as needed. Technically, it is actually the string "+" operator, (a function that takes two strings as parameters) that is allocating this space. This function returns a new string, of the appropriate size. The garbage collector will DEallocate "old" strings when they are no longer referenced by any variables.
I'm having trouble getting the text from the page.
Object reference error not set to an instance of an object, in the bold line.
String extractText = PdfTextExtractor.GetTextFromPage(pdfReader, i);
Follow the code below
var pdfText = new StringBuilder();
using (var pdfReader = new PdfReader(cbPdf.SelectedValue + ""))
{
for (var i = 0; i <= pdfReader.NumberOfPages; i++)
{
String extractText = PdfTextExtractor.GetTextFromPage(pdfReader, i);
extractText = Encoding.UTF8.GetString(Encoding.Convert(Encoding.Default, Encoding.UTF8, Encoding.Default.GetBytes(extractText)));
pdfText.Append(extractText);
}
}
rtxtTexto.Text = pdfText.ToString();
iText numbers pages 1-based, i.e. the first page has number 1.
You already did take that into account at the end of your loop (by comparing using <=), merely not at the start (where you start at 0).
Thus,
for (var i = 1; i <= pdfReader.NumberOfPages; i++)
That being said, as far as I know your line
extractText = Encoding.UTF8.GetString(Encoding.Convert(Encoding.Default, Encoding.UTF8, Encoding.Default.GetBytes(extractText)));
is nonsense.
I am new in this superb place. I got help several times from this site. I have seen many answers regarding my question that was previously discussed but i am facing problem to count the number of characters using FileReader. It's working using Scanner. This is what i tried:
class CountCharacter
{
public static void main(String args[]) throws IOException
{
File f = new File("hello.txt");
int charCount=0;
String c;
//int lineCount=0;
if(!f.exists())
{
f.createNewFile();
}
BufferedReader br = new BufferedReader(new FileReader(f));
while ( (c=br.readLine()) != null) {
String s = br.readLine();
charCount = s.length()-1;
charCount++;
}
System.out.println("NO OF LINE IN THE FILE, NAMED " +f.getName()+ " IS " +charCount);
}
}`
It looks to me that each time you go through the loop, you assign the charCount to be the length of the line that iteration of the loop is concerned with. i.e. instead of
charCount = s.Length() -1;
try
charCount = charCount + s.Length();
EDIT:
If you have say the document with the contents "onlyOneLine"
Then when you first hit the while check the br.readLine() will make the BufferredReader read the first line, during the while's code block however br.readLine() is called again which advances the BufferredReader to the second line of the document, which will return null. As null is assigned to s, and you call length(), then NPE is thrown.
try this for the while block
while ( (c=br.readLine()) != null) {
charCount = charCount + c.Length(); }
I am trying to read a xml file from the web and parse it out using XDocument. It normally works fine but sometimes it gives me this error for day:
**' ', hexadecimal value 0x1F, is an invalid character. Line 1, position 1**
I have tried some solutions from Google but they aren't working for VS 2010 Express Windows Phone 7.
There is a solution which replace the 0x1F character to string.empty but my code return a stream which doesn't have replace method.
s = s.Replace(Convert.ToString((byte)0x1F), string.Empty);
Here is my code:
void webClient_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
using (var reader = new StreamReader(e.Result))
{
int[] counter = { 1 };
string s = reader.ReadToEnd();
Stream str = e.Result;
// s = s.Replace(Convert.ToString((byte)0x1F), string.Empty);
// byte[] str = Convert.FromBase64String(s);
// Stream memStream = new MemoryStream(str);
str.Position = 0;
XDocument xdoc = XDocument.Load(str);
var data = from query in xdoc.Descendants("user")
select new mobion
{
index = counter[0]++,
avlink = (string)query.Element("user_info").Element("avlink"),
nickname = (string)query.Element("user_info").Element("nickname"),
track = (string)query.Element("track"),
artist = (string)query.Element("artist"),
};
listBox.ItemsSource = data;
}
}
XML file:
http://music.mobion.vn/api/v1/music/userstop?devid=
0x1f is a Windows control character. It is not valid XML. Your best bet is to replace it.
Instead of using reader.ReadToEnd() (which by the way - for a large file - can use up a lot of memory.. though you can definitely use it) why not try something like:
string input;
while ((input = sr.ReadLine()) != null)
{
string = string + input.Replace((char)(0x1F), ' ');
}
you can re-convert into a stream if you'd like, to then use as you please.
byte[] byteArray = Encoding.ASCII.GetBytes( input );
MemoryStream stream = new MemoryStream( byteArray );
Or else you could keep doing readToEnd() and then clean that string of illegal characters, and convert back to a stream.
Here's a good resource for cleaning illegal characters in your xml - chances are, youll have others as well...
https://seattlesoftware.wordpress.com/tag/hexadecimal-value-0x-is-an-invalid-character/
What could be happening is that the content is compressed in which case you need to decompress it.
With HttpHandler you can do this the following way:
var client = new HttpClient(new HttpClientHandler
{
AutomaticDecompression = DecompressionMethods.GZip
| DecompressionMethods.Deflate
});
With the "old" WebClient you have to derive your own class to achieve the similar effect:
class MyWebClient : WebClient
{
protected override WebRequest GetWebRequest(Uri address)
{
HttpWebRequest request = base.GetWebRequest(address) as HttpWebRequest;
request.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip;
return request;
}
}
Above taken from here
To use the two you would do something like this:
HttpClient
using (var client = new HttpClient(new HttpClientHandler { AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate }))
{
using (var stream = client.GetStreamAsync(url))
{
using (var sr = new StreamReader(stream.Result))
{
using (var reader = XmlReader.Create(sr))
{
var feed = System.ServiceModel.Syndication.SyndicationFeed.Load(reader);
foreach (var item in feed.Items)
{
Console.WriteLine(item.Title.Text);
}
}
}
}
}
WebClient
using (var stream = new MyWebClient().OpenRead("http://myrss.url"))
{
using (var sr = new StreamReader(stream))
{
using (var reader = XmlReader.Create(sr))
{
var feed = System.ServiceModel.Syndication.SyndicationFeed.Load(reader);
foreach (var item in feed.Items)
{
Console.WriteLine(item.Title.Text);
}
}
}
}
This way you also recieve the benefit of not having to .ReadToEnd() since you are working with the stream instead.
Consider using System.Web.HttpUtility.HtmlDecode if you're decoding content read from the web.
If you are having issues replacing the character
For me there were some issues if you try to replace using the string instead of the char. I suggest trying some testing values using both to see what they turn up. Also how you reference it has some effect.
var a = x.IndexOf('\u001f'); // 513
var b = x.IndexOf(Convert.ToString((byte)0x1F)); // -1
x = x.Replace(Convert.ToChar((byte)0x1F), ' '); // Works
x = x.Replace(Convert.ToString((byte)0x1F), " "); // Fails
I blagged this
I had the same issue and found that the problem was a embedded in the xml.
The solution was:
s = s.Replace(" ", " ")
I'd guess it's probably an encoding issue but without seeing the XML I can't say for sure.
In terms of your plan to simply replace the character but not being able to, because you have a stream rather than a text, simply read the stream into a string and then remove the characters you don't want.
Works for me.........
string.Replace(Chr(31), "")
I used XmlSerializer to parse XML and faced the same exception.
The problem is that the XML string contains HTML codes of invalid characters
This method removes all invalid HTML codes from string (based on this thread - https://forums.asp.net/t/1483793.aspx?Need+a+method+that+removes+illegal+XML+characters+from+a+String):
public static string RemoveInvalidXmlSubstrs(string xmlStr)
{
string pattern = "&#((\\d+)|(x\\S+));";
Regex regex = new Regex(pattern, RegexOptions.IgnoreCase);
if (regex.IsMatch(xmlStr))
{
xmlStr = regex.Replace(xmlStr, new MatchEvaluator(m =>
{
string s = m.Value;
string unicodeNumStr = s.Substring(2, s.Length - 3);
int unicodeNum = unicodeNumStr.StartsWith("x") ?
Convert.ToInt32(unicodeNumStr.Substring(1), 16)
: Convert.ToInt32(unicodeNumStr);
//according to https://www.w3.org/TR/xml/#charsets
if ((unicodeNum == 0x9 || unicodeNum == 0xA || unicodeNum == 0xD) ||
((unicodeNum >= 0x20) && (unicodeNum <= 0xD7FF)) ||
((unicodeNum >= 0xE000) && (unicodeNum <= 0xFFFD)) ||
((unicodeNum >= 0x10000) && (unicodeNum <= 0x10FFFF)))
{
return s;
}
else
{
return String.Empty;
}
})
);
}
return xmlStr;
}
Nobody can answer if you don't show relevant info - I mean the Xml content.
As a general advice I would put a breakpoint after ReadToEnd() call. Now you can do a couple of things:
Reveal Xml content to this forum.
Test it using VS Xml visualizer.
Copy-paste the string into a txt file and investigate it offline.