更改PropertyTagImageDescription的值

时间:2013-01-11 23:22:46

标签: c# image bitmap

我正在尝试解决为Bitmap对象更改值PropertyTagImageDescription(0x010E)的问题。添加文件的描述。搜索相关主题,并没有找到解决方案。我的用途:

Bitmap image = new Bitmap(Image.FromFile(fileName));
var data = System.Text.Encoding.UTF8.GetBytes("My comment");
PropertyItem propItem = image.GetPropertyItem(Convert.ToInt32(0x010E));
propItem.Len = data.Length;
propItem.Value = data;
image.SetPropertyItem(propItem);

但是有一个错误:“在GDI +错误中发生了通用。”

帮帮我理解!我做错了什么?

1 个答案:

答案 0 :(得分:1)

我无法找到您的错误我没有找到具有0x010E属性设置的图像。但我已经构建了一个有效的小控制台应用程序:

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

class Program
{
    static void Main(string[] args)
    {
        string imageLocation = @"C:\Users\Jens\Desktop\image.jpg";
        string newImageLocation = @"C:\Users\Jens\Desktop\newImage.jpg";

        // http://msdn.microsoft.com/en-us/library/ms534415(VS.85).aspx
        Int32 ImageDescription = 0x010E;

        // get file stream and create Image
        using (var fs = new FileStream(imageLocation, FileMode.Open, FileAccess.ReadWrite))
        using (var img = Image.FromStream(fs, false, false))
        {
            var data = Encoding.UTF8.GetBytes("My comment");

            // get a property from the image file and use it as container  
            var propItem = img.PropertyItems.FirstOrDefault();

            // set the values that u like to add
            // http://msdn.microsoft.com/en-us/library/system.drawing.imaging.propertyitem.aspx
            propItem.Type = 2;
            propItem.Id = ImageDescription;
            propItem.Len = data.Length;
            propItem.Value = data;

            // add property to Image and save it to the system
            img.SetPropertyItem(propItem);
            img.Save(newImageLocation);
        }
    }
}