| Newbie | | Join Date: Oct 2008 Location: Islamabad, Pakistan
Posts: 9
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| re: Read pdf file
use "iTextSharp" and use the following code to read contents of pdf in your code - using iTextSharp.text.pdf;
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using iTextSharp.text;
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private void openPDF()
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{
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string str = "";
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string newFile = "c:\\New Document.pdf";
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Document doc = new Document();
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PdfReader reader = new PdfReader("c:\\New Document.pdf");
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for (int i = 1; i <= reader.NumberOfPages; i++)
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{
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byte[] bt = reader.GetPageContent(i);
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str += ExtractTextFromPDFBytes(bt);
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}
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}
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private string ExtractTextFromPDFBytes(byte[] input)
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{
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if (input == null || input.Length == 0) return "";
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try
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{
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string resultString = "";
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// Flag showing if we are we currently inside a text object
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bool inTextObject = false;
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// Flag showing if the next character is literal
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// e.g. '\\' to get a '\' character or '\(' to get '('
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bool nextLiteral = false;
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// () Bracket nesting level. Text appears inside ()
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int bracketDepth = 0;
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// Keep previous chars to get extract numbers etc.:
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char[] previousCharacters = new char[_numberOfCharsToKeep];
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for (int j = 0; j < _numberOfCharsToKeep; j++) previousCharacters[j] = ' ';
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for (int i = 0; i < input.Length; i++)
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{
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char c = (char)input[i];
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if (inTextObject)
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{
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// Position the text
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if (bracketDepth == 0)
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{
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if (CheckToken(new string[] { "TD", "Td" }, previousCharacters))
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{
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resultString += "\n\r";
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}
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else
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{
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if (CheckToken(new string[] { "'", "T*", "\"" }, previousCharacters))
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{
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resultString += "\n";
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}
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else
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{
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if (CheckToken(new string[] { "Tj" }, previousCharacters))
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{
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resultString += " ";
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}
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}
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}
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}
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// End of a text object, also go to a new line.
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if (bracketDepth == 0 &&
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CheckToken(new string[] { "ET" }, previousCharacters))
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{
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inTextObject = false;
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resultString += " ";
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}
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else
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{
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// Start outputting text
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if ((c == '(') && (bracketDepth == 0) && (!nextLiteral))
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{
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bracketDepth = 1;
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}
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else
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{
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// Stop outputting text
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if ((c == ')') && (bracketDepth == 1) && (!nextLiteral))
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{
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bracketDepth = 0;
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}
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else
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{
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// Just a normal text character:
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if (bracketDepth == 1)
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{
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// Only print out next character no matter what.
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// Do not interpret.
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if (c == '\\' && !nextLiteral)
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{
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nextLiteral = true;
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}
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else
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{
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if (((c >= ' ') && (c <= '~')) ||
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((c >= 128) && (c < 255)))
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{
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resultString += c.ToString();
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}
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nextLiteral = false;
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}
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}
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}
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}
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}
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}
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// Store the recent characters for
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// when we have to go back for a checking
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for (int j = 0; j < _numberOfCharsToKeep - 1; j++)
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{
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previousCharacters[j] = previousCharacters[j + 1];
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}
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previousCharacters[_numberOfCharsToKeep - 1] = c;
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// Start of a text object
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if (!inTextObject && CheckToken(new string[] { "BT" }, previousCharacters))
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{
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inTextObject = true;
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}
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}
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return resultString;
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}
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catch
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{
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return "";
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}
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}
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private bool CheckToken(string[] tokens, char[] recent)
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{
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foreach (string token in tokens)
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{
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if ((recent[_numberOfCharsToKeep - 3] == token[0]) &&
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(recent[_numberOfCharsToKeep - 2] == token[1]) &&
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((recent[_numberOfCharsToKeep - 1] == ' ') ||
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(recent[_numberOfCharsToKeep - 1] == 0x0d) ||
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(recent[_numberOfCharsToKeep - 1] == 0x0a)) &&
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((recent[_numberOfCharsToKeep - 4] == ' ') ||
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(recent[_numberOfCharsToKeep - 4] == 0x0d) ||
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(recent[_numberOfCharsToKeep - 4] == 0x0a))
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)
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{
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return true;
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}
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}
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return false;
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}
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