用C#读取图片的EXIF信息的方法
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Drawing; using System.Drawing.Imaging; using System.Collections; namespace YEMLWEB.AppHelper { public class Picturexif { #region 构造函数 /// <summary> /// 构造函数 /// </summary> public Picturexif() { } #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;// added f值，光圈数 public MetadataDetail ExposureProg;// added 曝光程序 public MetadataDetail SpectralSense;// added public MetadataDetail ISOSpeed;// added ISO感光度 public MetadataDetail OECF;// added public MetadataDetail Ver;// added EXIF版本 public MetadataDetail CompConfig;// added 色彩设置 public MetadataDetail CompBPP;// added 压缩比率 public MetadataDetail Aperture;// added 光圈值 public MetadataDetail Brightness;// added 亮度值Ev public MetadataDetail ExposureBias;// added 曝光补偿 public MetadataDetail MaxAperture;// added 最大光圈值 public MetadataDetail SubjectDist;// added主体距离 public MetadataDetail LightSource;// added 白平衡 public MetadataDetail FocalLength;// added 焦距 public MetadataDetail FPXVer;// added FlashPix版本 public MetadataDetail ColorSpace;// added 色彩空间 public MetadataDetail Interop;// added public MetadataDetail FlashEnergy;// added public MetadataDetail SpatialFR;// added public MetadataDetail FocalXRes;// added public MetadataDetail FocalYRes;// added public MetadataDetail FocalResUnit;// added public MetadataDetail ExposureIndex;// added 曝光指数 public MetadataDetail SensingMethod;// added 感应方式 public MetadataDetail SceneType;// added public MetadataDetail CfaPattern;// added } #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; case "Flash": #region Flash { switch (Value) { case "0": DescriptionValue = "未使用"; break; case "1": DescriptionValue = "闪光"; break; case "5": DescriptionValue = "Flash fired but strobe return light not detected"; break; case "7": DescriptionValue = "Flash fired and strobe return light detected"; break; } } #endregion break; case "ExposureProg": #region ExposureProg { switch (Value) { case "0": DescriptionValue = "没有定义"; break; case "1": DescriptionValue = "手动控制"; break; case "2": DescriptionValue = "程序控制"; break; case "3": DescriptionValue = "光圈优先"; break; case "4": DescriptionValue = "快门优先"; break; case "5": DescriptionValue = "夜景模式"; break; case "6": DescriptionValue = "运动模式"; break; case "7": DescriptionValue = "肖像模式"; break; case "8": DescriptionValue = "风景模式"; break; case "9": DescriptionValue = "保留的"; break; } } #endregion break; case "CompConfig": #region CompConfig { switch (Value) { case "513": DescriptionValue = "YCbCr"; break; } } #endregion break; case "Aperture": #region Aperture DescriptionValue = Value; #endregion break; case "LightSource": #region LightSource { switch (Value) { case "0": DescriptionValue = "未知"; break; case "1": DescriptionValue = "日光"; break; case "2": DescriptionValue = "荧光灯"; break; case "3": DescriptionValue = "白炽灯"; break; case "10": DescriptionValue = "闪光灯"; break; case "17": DescriptionValue = "标准光A"; break; case "18": DescriptionValue = "标准光B"; break; case "19": DescriptionValue = "标准光C"; break; case "20": DescriptionValue = "标准光D55"; break; case "21": DescriptionValue = "标准光D65"; break; case "22": DescriptionValue = "标准光D75"; break; case "255": DescriptionValue = "其它"; break; } } #endregion break; } 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"; //added MyMetadata.ExposureProg.Hex = ""; //added MyMetadata.SpectralSense.Hex = "8824"; //added MyMetadata.ISOSpeed.Hex = "8827"; //added MyMetadata.OECF.Hex = "8828"; //added MyMetadata.Ver.Hex = "9000"; //added MyMetadata.CompConfig.Hex = "9101"; //added MyMetadata.CompBPP.Hex = "9102"; //added MyMetadata.Aperture.Hex = "9202"; //added MyMetadata.Brightness.Hex = "9203"; //added MyMetadata.ExposureBias.Hex = "9204"; //added MyMetadata.MaxAperture.Hex = "9205"; //added MyMetadata.SubjectDist.Hex = "9206"; //added MyMetadata.LightSource.Hex = "9208"; //added MyMetadata.FocalLength.Hex = "920a"; //added MyMetadata.FPXVer.Hex = "a000"; //added MyMetadata.ColorSpace.Hex = "a001"; //added MyMetadata.FocalXRes.Hex = "a20e"; //added MyMetadata.FocalYRes.Hex = "a20f"; //added MyMetadata.FocalResUnit.Hex = "a210"; //added MyMetadata.ExposureIndex.Hex = "a215"; //added MyMetadata.SensingMethod.Hex = "a217"; //added 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; } case "9207": { MyMetadata.MeteringMode.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value); MyMetadata.MeteringMode.DisplayValue = LookupEXIFValue("MeteringMode", BitConverter.ToInt16(MyImage.GetPropertyItem(MyPropertyId).Value, 0).ToString()); break; } case "9209": { MyMetadata.Flash.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value); MyMetadata.Flash.DisplayValue = LookupEXIFValue("Flash", BitConverter.ToInt16(MyImage.GetPropertyItem(MyPropertyId).Value, 0).ToString()); break; } case "829a": { MyMetadata.ExposureTime.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value); string StringValue = ""; for (int Offset = 0; Offset < MyImage.GetPropertyItem(MyPropertyId).Len; Offset = Offset + 4) { StringValue += BitConverter.ToInt32(MyImage.GetPropertyItem(MyPropertyId).Value, Offset).ToString() + "/"; } MyMetadata.ExposureTime.DisplayValue = StringValue.Substring(0, StringValue.Length - 1); break; } case "829d": { MyMetadata.Fstop.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value); int int1; int int2; int1 = BitConverter.ToInt32(MyImage.GetPropertyItem(MyPropertyId).Value, 0); int2 = BitConverter.ToInt32(MyImage.GetPropertyItem(MyPropertyId).Value, 4); MyMetadata.Fstop.DisplayValue = "F/" + (int1 / int2); MyMetadata.FNumber.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value); MyMetadata.FNumber.DisplayValue = BitConverter.ToInt16(MyImage.GetPropertyItem(MyPropertyId).Value, 0).ToString(); break; } case "9201": { MyMetadata.ShutterSpeed.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value); string StringValue = BitConverter.ToInt32(MyImage.GetPropertyItem(MyPropertyId).Value, 0).ToString(); MyMetadata.ShutterSpeed.DisplayValue = "1/" + StringValue; break; } case "8822": { MyMetadata.ExposureProg.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value); MyMetadata.ExposureProg.DisplayValue = LookupEXIFValue("ExposureProg", BitConverter.ToInt16(MyImage.GetPropertyItem(MyPropertyId).Value, 0).ToString()); break; } case "8824": { MyMetadata.SpectralSense.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value); MyMetadata.SpectralSense.DisplayValue = Value.GetString(MyPropertyItemList[index].Value); break; } case "8827": { hexVal = ""; MyMetadata.ISOSpeed.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value); hexVal = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value).Substring(0, 2); MyMetadata.ISOSpeed.DisplayValue = Convert.ToInt32(hexVal, 16).ToString();//Value.GetString(MyPropertyItemList[index].Value); break; } case "8828": { MyMetadata.OECF.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value); MyMetadata.OECF.DisplayValue = Value.GetString(MyPropertyItemList[index].Value); break; } case "9000": { MyMetadata.Ver.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value); MyMetadata.Ver.DisplayValue = Value.GetString(MyPropertyItemList[index].Value).Substring(1, 1) + "." + Value.GetString(MyPropertyItemList[index].Value).Substring(2, 2); break; } case "9101": { MyMetadata.CompConfig.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value); MyMetadata.CompConfig.DisplayValue = LookupEXIFValue("CompConfig", BitConverter.ToInt16(MyImage.GetPropertyItem(MyPropertyId).Value, 0).ToString()); break; } case "9102": { MyMetadata.CompBPP.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value); MyMetadata.CompBPP.DisplayValue = BitConverter.ToInt16(MyImage.GetPropertyItem(MyPropertyId).Value, 0).ToString(); break; } case "9202": { hexVal = ""; MyMetadata.Aperture.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value); hexVal = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value).Substring(0, 2); hexVal = Convert.ToInt32(hexVal, 16).ToString(); hexVal = hexVal + "00"; MyMetadata.Aperture.DisplayValue = hexVal.Substring(0, 1) + "." + hexVal.Substring(1, 2); break; } case "9203": { hexVal = ""; MyMetadata.Brightness.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value); hexVal = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value).Substring(0, 2); hexVal = Convert.ToInt32(hexVal, 16).ToString(); hexVal = hexVal + "00"; MyMetadata.Brightness.DisplayValue = hexVal.Substring(0, 1) + "." + hexVal.Substring(1, 2); break; } case "9204": { MyMetadata.ExposureBias.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value); MyMetadata.ExposureBias.DisplayValue = BitConverter.ToInt16(MyImage.GetPropertyItem(MyPropertyId).Value, 0).ToString(); break; } case "9205": { hexVal = ""; MyMetadata.MaxAperture.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value); hexVal = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value).Substring(0, 2); hexVal = Convert.ToInt32(hexVal, 16).ToString(); hexVal = hexVal + "00"; MyMetadata.MaxAperture.DisplayValue = hexVal.Substring(0, 1) + "." + hexVal.Substring(1, 2); break; } case "9206": { MyMetadata.SubjectDist.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value); MyMetadata.SubjectDist.DisplayValue = Value.GetString(MyPropertyItemList[index].Value); break; } case "9208": { MyMetadata.LightSource.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value); MyMetadata.LightSource.DisplayValue = LookupEXIFValue("LightSource", BitConverter.ToInt16(MyImage.GetPropertyItem(MyPropertyId).Value, 0).ToString()); break; } case "920a": { hexVal = ""; MyMetadata.FocalLength.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value); hexVal = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value).Substring(0, 2); hexVal = Convert.ToInt32(hexVal, 16).ToString(); hexVal = hexVal + "00"; MyMetadata.FocalLength.DisplayValue = hexVal.Substring(0, 1) + "." + hexVal.Substring(1, 2); break; } case "a000": { MyMetadata.FPXVer.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value); MyMetadata.FPXVer.DisplayValue = Value.GetString(MyPropertyItemList[index].Value).Substring(1, 1) + "." + Value.GetString(MyPropertyItemList[index].Value).Substring(2, 2); break; } case "a001": { MyMetadata.ColorSpace.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value); if (BitConverter.ToInt16(MyImage.GetPropertyItem(MyPropertyId).Value, 0).ToString() == "1") MyMetadata.ColorSpace.DisplayValue = "RGB"; if (BitConverter.ToInt16(MyImage.GetPropertyItem(MyPropertyId).Value, 0).ToString() == "65535") MyMetadata.ColorSpace.DisplayValue = "Uncalibrated"; break; } case "a20e": { MyMetadata.FocalXRes.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value); MyMetadata.FocalXRes.DisplayValue = BitConverter.ToInt16(MyImage.GetPropertyItem(MyPropertyId).Value, 0).ToString(); break; } case "a20f": { MyMetadata.FocalYRes.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value); MyMetadata.FocalYRes.DisplayValue = BitConverter.ToInt16(MyImage.GetPropertyItem(MyPropertyId).Value, 0).ToString(); break; } case "a210": { string aa; MyMetadata.FocalResUnit.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value); aa = BitConverter.ToInt16(MyImage.GetPropertyItem(MyPropertyId).Value, 0).ToString(); ; if (aa == "1") MyMetadata.FocalResUnit.DisplayValue = "没有单位"; if (aa == "2") MyMetadata.FocalResUnit.DisplayValue = "英尺"; if (aa == "3") MyMetadata.FocalResUnit.DisplayValue = "厘米"; break; } case "a215": { MyMetadata.ExposureIndex.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value); MyMetadata.ExposureIndex.DisplayValue = Value.GetString(MyPropertyItemList[index].Value); break; } case "a217": { string aa; aa = BitConverter.ToInt16(MyImage.GetPropertyItem(MyPropertyId).Value, 0).ToString(); MyMetadata.SensingMethod.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value); if (aa == "2") MyMetadata.SensingMethod.DisplayValue = "1 chip color area sensor"; break; } case "a301": { MyMetadata.SceneType.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value); MyMetadata.SceneType.DisplayValue = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value); break; } case "a302": { MyMetadata.CfaPattern.RawValueAsString = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value); MyMetadata.CfaPattern.DisplayValue = BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value); break; } } #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
Picturexif em = new Picturexif(); string filePath = Server.MapPath("Test.jpg");//这里可以动态传递图片路径的 Picturexif.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;
