C# (CSharp) iFilter Examples

Programming Language: C# (CSharp)

Class/Type: iFilter

Examples at hotexamples.com: 2

The IFilter interface in C# provides a standard way for applications to extract text or metadata from various file formats. Some examples of file formats supported by IFilter include Microsoft Office documents, PDFs, and HTML files.

One package library that includes the IFilter interface is the Microsoft Windows Search API. This library allows developers to integrate the Windows Search functionality into their applications, which includes the ability to use IFilters.

Here is an example of how to use the IFilter interface to extract text from a Microsoft Word document:

using System.Runtime.InteropServices;
using Microsoft.Office.Interop.Word;

public string ExtractTextFromWordFile(string filePath)
{
    string text = "";
    var app = new Application();
    var doc = app.Documents.Open(filePath);
    var range = doc.Content;
    range.Select();
    var ifilters = AppDomain.CurrentDomain.GetAssemblies()
        .SelectMany(x => x.GetTypes())
        .Where(x => typeof(IFilter).IsAssignableFrom(x));
    var wordFilter = ifilters.FirstOrDefault(x => x.Name == "FilterReader");
    if (wordFilter != null)
    {
        using (var filter = (IFilter)Activator.CreateInstance(wordFilter))
        {
            filter.Load(IFilterInitFlags.NONE, filePath, null);
            while (filter.Read(out var chunk))
            {
                text += chunk.Value;
            }
            filter.Dispose();
        }
    }
    doc.Close();
    app.Quit();
    return text;
}

This code uses the Microsoft Office Interop library to open a Word document and then uses the IFilter interface to extract the text from the document. The code first retrieves a list of available IFilters and then selects the one for Microsoft Word documents (FilterReader). It then loads the filter with the document file path and reads the content in chunks until all text has been extracted.

Another example is using the IFilter interface to extract metadata from a PDF file using the Adobe PDF IFilter:

using System.Runtime.InteropServices;
using System.Runtime.InteropServices.ComTypes;

public void ExtractPdfMetadata(string filePath)
{
    var ifilters = AppDomain.CurrentDomain.GetAssemblies()
        .SelectMany(x => x.GetTypes())
        .Where(x => typeof(IFilter).IsAssignableFrom(x));
    var adobeFilter = ifilters.FirstOrDefault(x =>
        x.FullName.StartsWith("Adobe.PDF.IFilter")
        || x.FullName.StartsWith("AdobeXMP.IFilter"));
    if (adobeFilter != null)
    {
        using (var filter = (IFilter)Activator.CreateInstance(adobeFilter))
        {
            filter.Load(IFilterInitFlags.NONE, filePath, null);
            while (filter.GetChunk(out STAT_CHUNK stat) != 0)
            {
                System.Diagnostics.Debug.WriteLine(stat.attribute.psProperty.ulKind.ToString());
                System.Diagnostics.Debug.WriteLine(filter.GetValue().ToString());
            }
            filter.Dispose();
        }
    }
}

This code retrieves the Adobe PDF IFilter and loads it with a PDF file path. It then iterates through the metadata chunks in the file and retrieves each attribute and its value. The output is written to the debug console.

C# (CSharp) iFilter - 2 examples found. These are the top rated real world C# (CSharp) examples of iFilter extracted from open source projects. You can rate examples to help us improve the quality of examples.

Frequently Used Methods

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Example #1

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File: Ruler.cs Project: prgoodwin/HabilisX

 public void addFilter(iFilter filter)
 {
    this.filters.Add(filter);
 }

Example #2

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File: Filter_Command.cs Project: drondrop/tr_po

 public Filter_Command(iFilter filter)
 {
     // _value = value;
     _filter = filter;
 }