pdfImageReference.cs :  » PDF » SharpPDF » sharpPDF » Elements » C# / CSharp Open Source

using System;
using System.IO;
using System.Drawing;
using System.Text;

using sharpPDF.Exceptions;

namespace sharpPDF.Elements{
  /// <summary>
  /// Class that represents an image reference inside the document.
  /// </summary>
  public sealed class pdfImageReference : IWritable
  {

    private int _ObjectID;
    private int _height;
    private int _width;
    private byte[] _content;

    /// <summary>
    /// Object's ID
    /// </summary>
    internal int ObjectID
    {
      get
      {
        return _ObjectID;
      }
      set
      {
        _ObjectID = value;
      }
    }

    /// <summary>
    /// Image's Height
    /// </summary>
    public int height
    {
      get
      {
        return _height;
      }
    }

    /// <summary>
    /// Image's Width
    /// </summary>
    public int width
    {
      get
      {
        return _width;
      }
    }

    /// <summary>
    /// Image's bytes
    /// </summary>
    internal byte[] content
    {
      get
      {
        return _content;
      }
    }

    /// <summary>
    /// Class's constructor
    /// </summary>
    /// <param name="imageName">Name of the image file</param>
    internal pdfImageReference(string imageName)
    {
      try 
      {
        Image myImage = Image.FromFile(imageName);
        MemoryStream outStream = new MemoryStream();      
        myImage.Save(outStream,System.Drawing.Imaging.ImageFormat.Jpeg);
        _content = new byte[outStream.Length];
        _content = outStream.ToArray();
        myImage.Dispose();
        myImage = Image.FromStream(outStream);
        _height = myImage.Height;
        _width = myImage.Width;
        myImage.Dispose();
        outStream.Close();
        outStream = null;
        myImage = null;
      } 
      catch (System.IO.FileNotFoundException ex) 
      {
        throw new pdfImageNotFoundException("Image "+ imageName +" not found!", ex);
      } 
      catch (System.IO.IOException ex) 
      {
        throw new pdfImageIOException("Generic IO error on the image  "+ imageName, ex);
      }
    }

    /// <summary>
    /// Class's constructor
    /// </summary>
    /// <param name="myImage">System.Drawing.Image object</param>
    internal pdfImageReference(Image myImage)
    {
      try 
      {        
        MemoryStream outStream = new MemoryStream();      
        myImage.Save(outStream,System.Drawing.Imaging.ImageFormat.Jpeg);
        _content = new byte[outStream.Length];
        _content = outStream.ToArray();
        myImage.Dispose();
        myImage = Image.FromStream(outStream);
        _height = myImage.Height;
        _width = myImage.Width;      
        myImage.Dispose();
        outStream.Close();
        outStream = null;
        myImage = null;
      } 
      catch (System.IO.IOException ex) 
      {
        throw new pdfImageIOException("Generic IO error on the image!", ex);
      }
    }

    #region IWritable

    /// <summary>
    /// Method that returns the PDF codes to write the image reference in the document.
    /// </summary>
    /// <returns>String that contains PDF codes</returns>
    public string getText()
    {
      StringBuilder resultImage = new StringBuilder();
      resultImage.Append(_ObjectID.ToString() + " 0 obj" + Convert.ToChar(13) + Convert.ToChar(10));
      resultImage.Append("<<" + Convert.ToChar(13) + Convert.ToChar(10));
      resultImage.Append("/Type /XObject" + Convert.ToChar(13) + Convert.ToChar(10));
      resultImage.Append("/Subtype /Image" + Convert.ToChar(13) + Convert.ToChar(10));
      resultImage.Append("/Name /I" + _ObjectID.ToString() + Convert.ToChar(13) + Convert.ToChar(10));
      resultImage.Append("/Filter /DCTDecode" + Convert.ToChar(13) + Convert.ToChar(10));
      resultImage.Append("/Width " + _width.ToString() + Convert.ToChar(13) + Convert.ToChar(10));
      resultImage.Append("/Height " + _height.ToString() + Convert.ToChar(13) + Convert.ToChar(10));
      resultImage.Append("/BitsPerComponent 8" + Convert.ToChar(13) + Convert.ToChar(10));
      resultImage.Append("/ColorSpace /DeviceRGB" + Convert.ToChar(13) + Convert.ToChar(10));
      resultImage.Append("/Length " + _content.Length.ToString() + Convert.ToChar(13) + Convert.ToChar(10));
      resultImage.Append(">>" + Convert.ToChar(13) + Convert.ToChar(10));
      return resultImage.ToString();  
    }

    #endregion
  }
}