Good morning! it’s always fun when old code gets to get used again. And it gave me an opportunity to convert this snippet to C#. Basically what we are trying to do is write or get metadata to an image. As those folks who commented on the previous post noted, this code will not remove existing metadata. It is a problem I still have not found a solution for however. If any of you know the answer please let us know! Anyway here it is converted and still useable after all this time.
using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Drawing.Imaging;
using System.Reflection;
using System.IO;
public class clsReadMetaData
{
public ImageMetadata ReadEXIFMetadata(string filepath)
{
FileStream fs = new FileStream(filepath, FileMode.Open, FileAccess.Read);
Image image__1 = Image.FromStream(fs);
PropertyItem[] imagePropertyItems = image__1.PropertyItems;
ImageMetadata imageMetadata = new ImageMetadata();
foreach (PropertyItem pi in imagePropertyItems)
{
switch ((EXIFProperty)pi.Id)
{
case EXIFProperty.Title:
imageMetadata.Title = Encoding.Unicode.GetString(pi.Value);
//imageMetadata.Title = Encoding.UTF32.GetString(pi.Value)
break;
case EXIFProperty.Author:
imageMetadata.Author = Encoding.Unicode.GetString(pi.Value);
//imageMetadata.Author = Encoding.UTF8.GetString(pi.Value)
break;
case EXIFProperty.Keywords:
imageMetadata.Keywords = Encoding.Unicode.GetString(pi.Value);
//imageMetadata.Keywords = Encoding.UTF8.GetString(pi.Value)
break;
case EXIFProperty.Comments:
imageMetadata.Comments = Encoding.Unicode.GetString(pi.Value);
//imageMetadata.Comments = Encoding.UTF8.GetString(pi.Value)
break;
default:
break;
}
}
fs.Close();
return imageMetadata;
}
public void SaveEXIFMetadata(Image image, ImageMetadata metadata, string filepath)
{
SaveEXIFMetadataProperty(image, EXIFProperty.Title, metadata.Title, filepath);
SaveEXIFMetadataProperty(image, EXIFProperty.Author, metadata.Author, filepath);
SaveEXIFMetadataProperty(image, EXIFProperty.Keywords, metadata.Keywords, filepath);
SaveEXIFMetadataProperty(image, EXIFProperty.Comments, metadata.Comments, filepath);
}
private void SaveEXIFMetadataProperty(Image image, EXIFProperty property, string propertyValue, string filepath)
{
PropertyItem propertyItem = CreatePropertyItem();
propertyItem.Id = Convert.ToInt32(property);
// Type=1 means Array of Bytes.
propertyItem.Type = 2;
propertyItem.Len = propertyValue.Length;
//propertyItem.Value = Encoding.Unicode.GetBytes(propertyValue)
propertyItem.Value = Encoding.UTF8.GetBytes(propertyValue);
image.SetPropertyItem(propertyItem);
image.Save(filepath);
}
private PropertyItem CreatePropertyItem()
{
System.Reflection.ConstructorInfo ci = typeof(PropertyItem).GetConstructor(BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Public, null, new Type[0], null);
return (PropertyItem)ci.Invoke(null);
}
}
public enum EXIFProperty
{
Title = 40091,
Author = 40093,
Keywords = 40094,
Comments = 40092
}
public class ImageMetadata
{
private string _title = string.Empty;
private string _author = string.Empty;
private string _keywords = string.Empty;
private string _comments = string.Empty;
public ImageMetadata()
{
this._title = string.Empty;
this._author = string.Empty;
this._keywords = string.Empty;
this._comments = string.Empty;
}
public ImageMetadata(string title, string author, string keywords, string comments)
{
this._title = title;
this._author = author;
this._keywords = keywords;
this._comments = comments;
}
public string Title
{
get
{
return this._title;
}
set
{
this._title = value;
}
}
public string Author
{
get
{
return this._author;
}
set
{
this._author = value;
}
}
public string Keywords
{
get
{
return this._keywords;
}
set
{
this._keywords = value;
}
}
public string Comments
{
get
{
return this._comments;
}
set
{
this._comments = value;
}
}
}
