/// <summary>
/// Reads a PDF file and extracts all text-searchable content from it.
/// </summary>
/// <param name="file">The file to extract text from.</param>
/// <returns>The text from the PDF file</returns>
public static string ReadFile(string file)
{
if (string.IsNullOrEmpty(file)) throw new ArgumentNullException("file", "file cannot be null or empty");
FileInfo info = new FileInfo(file);
if (!info.Exists) throw new FileNotFoundException("file must exist");
if (!info.Extension.Equals(".pdf", StringComparison.OrdinalIgnoreCase)) throw new ArgumentException("File must have a .pdf extension");
System.Text.StringBuilder builder = new System.Text.StringBuilder();
iTextSharp.text.pdf.PdfReader reader = null;
try {
reader = new iTextSharp.text.pdf.PdfReader(info.FullName);
for (int i = 1; i <= reader.NumberOfPages; i++) {
builder.Append(ExtractTextFromPDFBytes(reader.GetPageContent(i)));
builder.Append(' ');
}
}
catch (Exception) {
}
finally {
if (reader != null) reader.Close();
}
return builder.ToString();
}
/// <summary>
/// Reads a PDF file and extracts all text-searchable content from it.
/// </summary>
/// <param name="file">The file to extract text from.</param>
/// <returns>The text from the PDF file</returns>
public static string ReadFile(string file)
{
if (string.IsNullOrEmpty(file))
{
throw new ArgumentNullException("file", "file cannot be null or empty");
}
FileInfo info = new FileInfo(file);
if (!info.Exists)
{
throw new FileNotFoundException("file must exist");
}
if (!info.Extension.Equals(".pdf", StringComparison.OrdinalIgnoreCase))
{
throw new ArgumentException("File must have a .pdf extension");
}
System.Text.StringBuilder builder = new System.Text.StringBuilder();
iTextSharp.text.pdf.PdfReader reader = null;
try {
reader = new iTextSharp.text.pdf.PdfReader(info.FullName);
for (int i = 1; i <= reader.NumberOfPages; i++)
{
builder.Append(ExtractTextFromPDFBytes(reader.GetPageContent(i)));
builder.Append(' ');
}
}
catch (Exception) {
}
finally {
if (reader != null)
{
reader.Close();
}
}
return(builder.ToString());
}
/// <summary>
/// Uses the GetResponseCore and GetResponseCoreFinalize to 'inherit' the IFilter behaviour
/// but also extend it with iTextSharp
/// </summary>
/// <remarks>
/// Add iTextSharp to get better 'title'
/// [v7] fix by [email protected]
/// </remarks>
public override bool GetResponse(System.Net.HttpWebResponse webresponse)
{
string filename = System.IO.Path.Combine(Preferences.DownloadedTempFilePath, (System.IO.Path.GetFileName(this.Uri.LocalPath)));
base.GetResponseCore(webresponse, filename);
// [v7] fix by [email protected]
iTextSharp.text.pdf.PdfReader pdfReader = new iTextSharp.text.pdf.PdfReader(filename);
if (null != pdfReader.Info["Title"])
{ // overwrite the 'filename' with the embedded title
string pdfTitle = Convert.ToString(pdfReader.Info["Title"]).Trim();
if (!String.IsNullOrEmpty(pdfTitle))
{
this.Title = pdfTitle;
}
}
// Now, since we've loaded the iTextSharp library, and the EPocalipse IFilter sometimes
// fails (old Acrobat, installation problem, etc); let's try 'indexing' the PDF with iTextSharp
// [v7]
if (String.IsNullOrEmpty(this.All))
{
this.All = String.Empty;
System.Text.StringBuilder sb = new System.Text.StringBuilder();
// Following code from:
// http://www.vbforums.com/showthread.php?t=475759
for (int p = 1; p <= pdfReader.NumberOfPages; p++)
{
byte[] pageBytes = pdfReader.GetPageContent(p);
if (null != pageBytes)
{
iTextSharp.text.pdf.PRTokeniser token = new iTextSharp.text.pdf.PRTokeniser(new iTextSharp.text.pdf.RandomAccessFileOrArray(pageBytes));
while (token.NextToken())
{
iTextSharp.text.pdf.PRTokeniser.TokType tknType = token.TokenType;
string tknValue = token.StringValue;
if (tknType == iTextSharp.text.pdf.PRTokeniser.TokType.STRING)
{
sb.Append(token.StringValue);
}
else if (tknType == iTextSharp.text.pdf.PRTokeniser.TokType.NUMBER && tknValue == "-600")
{
sb.Append(" ");
}
else if (tknType == iTextSharp.text.pdf.PRTokeniser.TokType.OTHER && tknValue == "TJ")
{
sb.Append(" ");
}
}
}
}
this.All += sb.ToString().Replace('\0', ' ');
}
pdfReader.Close();
base.GetResponseCoreFinalize(filename);
if (!String.IsNullOrEmpty(this.All))
{
this.Description = base.GetDescriptionFromWordsOnly(WordsOnly);
return(true);
}
else
{
return(false);
}
}
/// <summary>
/// Uses the GetResponseCore and GetResponseCoreFinalize to 'inherit' the IFilter behaviour
/// but also extend it with iTextSharp
/// </summary>
/// <remarks>
/// Add iTextSharp to get better 'title'
/// [v7] fix by [email protected]
/// </remarks>
public override bool GetResponse(System.Net.HttpWebResponse webresponse)
{
string filename = System.IO.Path.Combine(Preferences.DownloadedTempFilePath, (System.IO.Path.GetFileName(this.Uri.LocalPath)));
base.GetResponseCore(webresponse, filename);
// [v7] fix by [email protected]
iTextSharp.text.pdf.PdfReader pdfReader = new iTextSharp.text.pdf.PdfReader(filename);
if (null != pdfReader.Info["Title"])
{ // overwrite the 'filename' with the embedded title
string pdfTitle = Convert.ToString(pdfReader.Info["Title"]).Trim();
if (!String.IsNullOrEmpty(pdfTitle))
{
this.Title = pdfTitle;
}
}
// Now, since we've loaded the iTextSharp library, and the EPocalipse IFilter sometimes
// fails (old Acrobat, installation problem, etc); let's try 'indexing' the PDF with iTextSharp
// [v7]
if (String.IsNullOrEmpty(this.All))
{
this.All = String.Empty;
System.Text.StringBuilder sb = new System.Text.StringBuilder();
// Following code from:
// http://www.vbforums.com/showthread.php?t=475759
for (int p = 1; p <= pdfReader.NumberOfPages; p++)
{
byte[] pageBytes = pdfReader.GetPageContent(p);
if (null != pageBytes)
{
iTextSharp.text.pdf.PRTokeniser token = new iTextSharp.text.pdf.PRTokeniser(new iTextSharp.text.pdf.RandomAccessFileOrArray(pageBytes));
while (token.NextToken())
{
iTextSharp.text.pdf.PRTokeniser.TokType tknType = token.TokenType;
string tknValue = token.StringValue;
if (tknType == iTextSharp.text.pdf.PRTokeniser.TokType.STRING)
{
sb.Append(token.StringValue);
}
else if (tknType == iTextSharp.text.pdf.PRTokeniser.TokType.NUMBER && tknValue == "-600")
{
sb.Append(" ");
}
else if (tknType == iTextSharp.text.pdf.PRTokeniser.TokType.OTHER && tknValue == "TJ")
{
sb.Append(" ");
}
}
}
}
this.All += sb.ToString().Replace('\0', ' ');
}
pdfReader.Close();
base.GetResponseCoreFinalize(filename);
if (!String.IsNullOrEmpty(this.All))
{
this.Description = base.GetDescriptionFromWordsOnly(WordsOnly);
return true;
}
else
{
return false;
}
}
