用C#读取图片的EXIF信息的方法(二)

用C#读取图片的EXIF信息的方法(二)

http://www.21tx.com 2004年03月21日 Blog rexsp

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Collections;
using System.ComponentModel;

namespace Test.Com
{
 /// <summary>
 /// 功能：获得图片EXIF信息
 /// 作者：Rexsp
 /// 创建日期：2004-03-20
 /// </summary>
 public class EXIFMetaData
 {
  #region 构造函数
  /// <summary>
  /// 构造函数
  /// </summary>
  public EXIFMetaData()
  {
  }
  #endregion

  #region 数据转换结构
  /// <summary>
  /// 转换数据结构
  /// </summary>
  public struct MetadataDetail
  {
   public string Hex;//十六进制字符串
   public string RawValueAsString;//原始值串
   public string DisplayValue;//显示值串
  }
  #endregion

  #region EXIF元素结构
  /// <summary>
  /// 结构：存储EXIF元素信息
  /// </summary>
  public struct Metadata
  {
   public MetadataDetail EquipmentMake;
   public MetadataDetail CameraModel;
   public MetadataDetail ExposureTime;//曝光时间
   public MetadataDetail Fstop;
   public MetadataDetail DatePictureTaken;
   public MetadataDetail ShutterSpeed;// 快门速度
   public MetadataDetail MeteringMode;//曝光模式
   public MetadataDetail Flash;//闪光灯
   public MetadataDetail XResolution;
   public MetadataDetail YResolution;
   public MetadataDetail ImageWidth;//照片宽度
   public MetadataDetail ImageHeight;//照片高度

   public MetadataDetail FNumber;//  f值，光圈数
   public MetadataDetail ExposureProg;//  曝光程序
   public MetadataDetail SpectralSense;// 
   public MetadataDetail ISOSpeed;//  ISO感光度
   public MetadataDetail OECF;// 
   public MetadataDetail Ver;//  EXIF版本
   public MetadataDetail CompConfig;//  色彩设置
   public MetadataDetail ComPBPP;//  压缩比率
   public MetadataDetail Aperture;//  光圈值
   public MetadataDetail Brightness;//  亮度值Ev
   public MetadataDetail ExposureBias;//  曝光补偿
   public MetadataDetail MaxAperture;//  最大光圈值

   public MetadataDetail SubjectDist;// 主体距离
   public MetadataDetail LightSource;//  白平衡
   public MetadataDetail FocalLength;//  焦距
   public MetadataDetail FPXVer;//  FlashPix版本
   public MetadataDetail ColorSpace;//  色彩空间
   public MetadataDetail Interop;// 
   public MetadataDetail FlashEnergy;// 
   public MetadataDetail SpatialFR;// 
   public MetadataDetail FocalXRes;// 
   public MetadataDetail FocalYRes;// 
   public MetadataDetail FocalResUnit;// 
   public MetadataDetail ExposureIndex;//  曝光指数
   public MetadataDetail SensingMethod;//  感应方式
   public MetadataDetail SceneType;// 
   public MetadataDetail CfaPattern;// 
  }
  #endregion

  #region 查找EXIF元素值
  public string LookupEXIFValue(string Description, string Value)
  {
   string DescriptionValue = null;

   switch(Description)
   {
    case "MeteringMode":

     #region  MeteringMode
    {
     switch(Value)
     {
      case "0":
       DescriptionValue = "Unknown";break;
      case "1":
       DescriptionValue = "Average";break;
      case "2":
       DescriptionValue = "Center Weighted Average";break;
      case "3":
       DescriptionValue = "Spot";break;
      case "4":
       DescriptionValue = "Multi-spot";break;
      case "5":
       DescriptionValue = "Multi-segment";break;
      case "6":
       DescriptionValue = "Partial";break;
      case "255":
       DescriptionValue = "Other";break;
     }
    }
     #endregion
     
     break;
    case "ResolutionUnit":

     #region ResolutionUnit
    {
     switch(Value)
     {
      case "1":
       DescriptionValue = "No Units";break;
      case "2":
       DescriptionValue = "Inch";break;
      case "3":
       DescriptionValue = "Centimeter";break;
     }
    }

     #endregion

     break;
    //省略Ｎ行相似代码

   }
   return DescriptionValue;
  }
  #endregion

  #region 取得图片的EXIF信息
  public Metadata GetEXIFMetaData(string PhotoName)
  {
   // 创建一个图片的实例
   System.Drawing.Image MyImage = System.Drawing.Image.FromFile(PhotoName);
   // 创建一个整型数组来存储图像中属性数组的ID
   int[] MyPropertyIdList = MyImage.PropertyIdList;
   //创建一个封闭图像属性数组的实例
   PropertyItem[] MyPropertyItemList = new PropertyItem[MyPropertyIdList.Length];
   //创建一个图像EXIT信息的实例结构对象，并且赋初值

   #region 创建一个图像EXIT信息的实例结构对象，并且赋初值
   Metadata MyMetadata = new Metadata();
   MyMetadata.EquipmentMake.Hex = "10f";
   MyMetadata.CameraModel.Hex = "110";
   MyMetadata.DatePictureTaken.Hex = "9003";
   MyMetadata.ExposureTime.Hex = "829a";
   MyMetadata.Fstop.Hex = "829d";
   MyMetadata.ShutterSpeed.Hex = "9201";
   MyMetadata.MeteringMode.Hex = "9207";
   MyMetadata.Flash.Hex = "9209";
   MyMetadata.FNumber.Hex = "829d"; //
   MyMetadata.ExposureProg.Hex = ""; //
   MyMetadata.SpectralSense.Hex = "8824"; //
   MyMetadata.ISOSpeed.Hex = "8827"; //
   MyMetadata.OECF.Hex = "8828"; //
   MyMetadata.Ver.Hex = "9000"; //
   MyMetadata.CompConfig.Hex = "9101"; //
   MyMetadata.CompBPP.Hex = "9102"; //
   MyMetadata.Aperture.Hex = "9202"; //
   MyMetadata.Brightness.Hex = "9203"; //
   MyMetadata.ExposureBias.Hex = "9204"; //
   MyMetadata.MaxAperture.Hex = "9205"; //
   MyMetadata.SubjectDist.Hex = "9206"; //
   MyMetadata.LightSource.Hex = "9208"; //
   MyMetadata.FocalLength.Hex = "920a"; //
   MyMetadata.FPXVer.Hex = "a000"; //
   MyMetadata.ColorSpace.Hex = "a001"; //
   MyMetadata.FocalXRes.Hex = "a20e"; //
   MyMetadata.FocalYRes.Hex = "a20f"; //
   MyMetadata.FocalResUnit.Hex = "a210"; //
   MyMetadata.ExposureIndex.Hex = "a215"; //
   MyMetadata.SensingMethod.Hex = "a217"; //
   MyMetadata.SceneType.Hex = "a301";
   MyMetadata.CfaPattern.Hex = "a302";
   #endregion

   // ASCII编码
   System.Text.ASCIIEncoding Value = new System.Text.ASCIIEncoding();
           
   int index = 0;
   int MyPropertyIdListCount=MyPropertyIdList.Length;
   if(MyPropertyIdListCount!=0)
   {
    foreach (int MyPropertyId in MyPropertyIdList)
    {
     string hexVal = "";
     MyPropertyItemList[index] = MyImage.GetPropertyItem(MyPropertyId);

     #region 初始化各属性值
     string myPropertyIdString=MyImage.GetPropertyItem(MyPropertyId).Id.ToString("x");
     switch(myPropertyIdString)
     {
      case "10f":
      {
       MyMetadata.EquipmentMake.RawValueAsString =BitConverter.ToString(MyImage.GetPropertyItem (MyPropertyId).Value);
       MyMetadata.EquipmentMake.DisplayValue = Value.GetString(MyPropertyItemList[index].Value);
       break;
      }

      case "110":
      {
       MyMetadata.CameraModel.RawValueAsString =BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);
       MyMetadata.CameraModel.DisplayValue =Value.GetString(MyPropertyItemList[index].Value);
       break;

      }

      case "9003":
      {
       MyMetadata.DatePictureTaken.RawValueAsString =BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value);
       MyMetadata.DatePictureTaken.DisplayValue =Value.GetString(MyPropertyItemList[index].Value);
       break;
      }
    //省略Ｎ行相似代码
     }
     #endregion
     
     index++;
    }
   }

   MyMetadata.XResolution.DisplayValue = MyImage.HorizontalResolution.ToString();
   MyMetadata.YResolution.DisplayValue = MyImage.VerticalResolution.ToString();
   MyMetadata.ImageHeight.DisplayValue = MyImage.Height.ToString();
   MyMetadata.ImageWidth.DisplayValue = MyImage.Width.ToString();
   MyImage.Dispose();
   return MyMetadata;
  }
  #endregion
 }
}

然后就是个调用的问题，有了这个类，我如何读取图片的ＥＸＩＦ信息呢？代码如下：
   EXIFMetaData em = new EXIFMetaData();
   string filePath=Server.MapPath("Test.jpg");//这里可以动态传递图片路径的
   EXIFMetaData.Metadata m = em.GetEXIFMetaData(filePath);//这里就是调用，传图片绝对路径
   string exif = m.Ver.DisplayValue;
   string camera = m.CameraModel.DisplayValue;
   string model = m.CameraModel.DisplayValue;
   string aperture = m.Aperture.DisplayValue;
   string shutter = m.ShutterSpeed.DisplayValue;
   string sensitive = m.ExposureIndex.DisplayValue;

有什么不明白的，欢迎提出来，此代码经过测试，功能正常。