Escape Sequences

While Coding we use many special characters, and we have seen some characters which start with a backslash ("\"). All the characters which starts from backslash ("\") is known as the escape sequence. There are several escape sequence are used in the c# here are the list of that. you can use them according to the use..

\a Bell (alert)

\b Backspace

\f Formfeed

\n New line

\r Carriage return

\t Horizontal tab

\v Vertical tab

\' Single quotation mark

\" Double quotation mark

\\ Backslash

\? Literal question mark

\ooo ASCII character in octal notation

\xhh ASCII character in hexadecimal notation

\xhhhh Unicode character in hexadecimal notation if this escape sequence is used in a wide-character constant or a Unicode string literal.

Hope the information was useful.. Happy coding!!!!

Thanks
Anil Kumar Pandey
System Architect, MVP
Mumbai, Maharshtra

Executing a batch file with parameter from C#

hello All,

Some time we need to run or execute a batch file inside our code behind using the c# code, for that reason here I am going to show that how can we run a batch file inside the code behind. We can also pass the required parameter to run the file. Please check the following code.

try
{
System.Diagnostics.Process() objProcess = new System.Diagnostics.Process(); // Create the process object
objProcess.StartInfo.FileName = "c:\\Anil\\testAnil; //batch File Name
objProcess.StartInfo.Arguments = "c:\\Anil\\testAnil" + strXmlFileName;//paramter file name
objProcess.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Normal;
objProcess.Start();
//Wait until the process passes back an exit code
objProcess.WaitForExit();
//Free resources associated with this process
objProcess.Close();
}
catch (Exception ex)
{
MessageBox.Show("Could not start process " + FileNameNew, "Error");
}

I hope this will solve your problem. Waiting for your comments..!! Happy Coding!!

Thanks
Anil Kumar Pandey
System Architect, MVP
Mumbai, Maharshtra

Reading a PDF file content using iTextSharp

hi there,

iTextSharp has made reading the DLL so easy, that using a simple function we can read the content of the PDF file. We just need to use this dll, this can be easily downloaded from the following sites.

SourceForge

WebScript

Using the following fuction we can read the PDF file by specifying the page no.. here is the code.

using iTextSharp.text.pdf;


string filename = "FileName";
PdfReader reader = new PdfReader(filename);
int intPageCount = reader.NumberOfPages;
string strContent = ParsePdfText(filename, 1, intPageCount);

public string ParsePdfText(string sourcePDF, int fromPageNum,int toPageNum)
{
System.Text.StringBuilder sb = new System.Text.StringBuilder();
try
{
PdfReader reader = new PdfReader(sourcePDF);
byte[] pageBytes = null;
PRTokeniser token = null;
int tknType = -1;
string tknValue = string.Empty;
for (int i = fromPageNum; i <= toPageNum; i += 1)
{
pageBytes = reader.GetPageContent(i);
if ((pageBytes != null))
{
token = new PRTokeniser(pageBytes);
while (token.NextToken())
{
tknType = token.TokenType;
tknValue = token.StringValue;
if (tknType == PRTokeniser.TK_STRING)
{
sb.Append(token.StringValue);
}

else if (tknType == 1 && tknValue == "-600")
{
sb.Append(" ");
}
else if (tknType == 10 && tknValue == "TJ")
{
sb.Append(" ");
}
}
}
}
}
catch (Exception ex)
{
MessageBox.Show("Exception occured. " + ex.Message);
return string.Empty;
}
return sb.ToString();
}

The varibale strContent will contain all the data present in the PDF file. using the starting page no and End page no we can spicy the limit from which page to which we want to read the content.

Isn't that so easy.. waiting for all your comment..

Thanks
Anil Kumar Pandey
System Architect, MVP
Mumbai, Maharshtra