XMLTextReader.Read()

[midhunmathe]

Hello,

I get an error
#', hexadecimal value 0x07, is an invalid character. Line 2, position 6358.
on the XMLTextReader.R ead() call on a particular node of my XML document.

I need this data to be parsed. This is a cyrillic character data and my comp has a latin code page 1252. Is XML parsing dependant on these values? If yes, is there any means by which I can parse the unicode characters getting into my system?

Any help is appriciated.

Thanks and warm regards,
- Midhun George

[vijaydiwakar]

Hello,

I get an error
#', hexadecimal value 0x07, is an invalid character. Line 2, position 6358.
on the XMLTextReader.R ead() call on a particular node of my XML document.

I need this data to be parsed. This is a cyrillic character data and my comp has a latin code page 1252. Is XML parsing dependant on these values? If yes, is there any means by which I can parse the unicode characters getting into my system?

Any help is appriciated.

Thanks and warm regards,
- Midhun George

this error occures when thy xml contains any unwanted char in the filed name tag check it

[midhunmathe]

this error occures when thy xml contains any unwanted char in the filed name tag check it

Hello Vijay,

I know that. the #x07 character cannot be parsed by the XMLText reader. I want to know the reason. I want to if there is any possibility to parse this. If we are not able to parse this, then I want to know about the characters that are not parsed.

This is because, my application cannot guarentee the characters coming in to be parsed as the data is sent to my application by another unicode application. There can be Chinese, Japanese, and all sorts of other characters coming in.The application which runs on a system with codepage 1252. I need to know whether it is possible to configure the system to accept all characters even if they are junk rather than throwing any error (i did not mean exception handling).

Thanks...

[kenobewan]

I believe that the problem is the ASCII "bell" byte code (#), and that when # is in the code XMLTextReader is expecting an ASCII char. Have you tried replacing it with its ASCII equivalent - & # 3 5 ;?

Here is a list of potential problems that I have found:
Hex Value Explanation
0x01 Start of Heading
0x02 Start of Text
0x03 End of Text
0x04 End of Transmission
0x05 Enquiry
0x06 Acknowledge
0x07 Bell
0x08 Backspace
0x0B Vertical Tabulation
0x0C Form Feed
0x0E Shift Out
0x0F Shift In
0x10 Data Link Escape
0x11 Device Control One
0x12 Device Control Two
0x13 Device Control Three
0x14 Device Control Four
0x15 Negative Acknowledge
0x16 Synchronous Idle
0x17 End of Transmission Block
0x18 Cancel
0x19 End of Medium

[midhunmathe]

Thanks a lot. Now I get the actual problem.

XMLTextReader.R ead() Throws an exception when an unwanted character like the ones mentioned above comes in the stream. How can I ignore this?

This is the pseudo code

try
{[INDENT]reader = new XmlTextReader(filename);[/INDENT][INDENT]reader.WhitespaceHandling = WhitespaceHandling.None;[/INDENT][INDENT]while (true) [/INDENT][INDENT]{[/INDENT][INDENT][INDENT]try[/INDENT][/INDENT][INDENT][INDENT]{[/INDENT][/INDENT][INDENT][INDENT][INDENT]if (!reader.Read())[/INDENT][/INDENT][/INDENT][INDENT][INDENT][INDENT][INDENT]break;[/INDENT][/INDENT][/INDENT][/INDENT][INDENT][INDENT][INDENT]// Some processing[/INDENT][/INDENT][/INDENT][INDENT][INDENT]}[/INDENT][/INDENT][INDENT][INDENT]catch (XMLException XML_exc)[/INDENT][/INDENT][INDENT][INDENT]{[/INDENT][/INDENT][INDENT][INDENT][INDENT]//*** NEED TO DO SOMETHING TO SKIP THIS NODE ***[/INDENT][/INDENT][/INDENT][INDENT][INDENT][INDENT]//*** ELSE THIS IS AN INFINITE LOOP[/INDENT][/INDENT][/INDENT][INDENT][INDENT][INDENT]continue;[/INDENT][/INDENT][/INDENT][INDENT][INDENT]}[/INDENT][/INDENT][INDENT]}[/INDENT]
}
catch (Exception e) //other exceptions
{[INDENT]//some processing[/INDENT]
}
finally
{[INDENT]if (reader != null)[/INDENT][INDENT][INDENT]reader.Close()[/INDENT][/INDENT]
}

[beanwa]

String Cleanup

Here's a handy string cleansing class to get rid of the invalid characters before sending them to your xml file. I got a little creative naming the Hashtable.

string cleanString = BytesSite.StringHelp.ValidString(possibleBadString);

-----------------------------------------------------------------------------------------------------------

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;

namespace BytesSite
{
    internal class StringHelp
    {
        static Hashtable Guitar = new Hashtable();

        static string convertAsciiToHex(String pAsciiText) 
        { 
            StringBuilder sBuffer = new StringBuilder();
            for (int i = 0; i < pAsciiText.Length; i++) 
            {
                sBuffer.Append(Convert.ToInt32(pAsciiText[i]).ToString("x")); 
            } 
            return sBuffer.ToString().ToUpper(); 
        }

        static bool invalidHex(string pHexValue)
        {
            populateGuitar();
            return Guitar.ContainsKey(pHexValue);
        }

        public static string ValidString(string pString)
        {
            string returnString = string.Empty;
            for (int i = 0; i < pString.Length; i++)
            {
                if (!invalidHex(convertAsciiToHex(pString[i].ToString())))
                    returnString += pString[i].ToString();
            }

            return returnString;
        }

        private static void populateGuitar()
        {
            if (Guitar.Count == 0)
            {
                Guitar.Add("1", "1");
                Guitar.Add("2", "2");
                Guitar.Add("3", "3");
                Guitar.Add("4", "4");
                Guitar.Add("5", "5");
                Guitar.Add("6", "6");
                Guitar.Add("7", "7");
                Guitar.Add("8", "8");
                Guitar.Add("10", "10");
                Guitar.Add("11", "11");
                Guitar.Add("12", "12");
                Guitar.Add("13", "13");
                Guitar.Add("14", "14");
                Guitar.Add("15", "15");
                Guitar.Add("16", "16");
                Guitar.Add("17", "17");
                Guitar.Add("18", "18");
                Guitar.Add("19", "19");
                Guitar.Add("B", "B");
                Guitar.Add("C", "C");
                Guitar.Add("E", "E");
                Guitar.Add("F", "F");
            }
        }
    }
}