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。