Use C # To Read The EXIF information of a photo (jpg image,

Use C # To Read The EXIF information of a photo (jpg image,

Introduction: EXIF, which is an English Exchangeable Image File
{
}
# Endregion # region data conversion structure
/// Summary>
/// Convert the Data Structure
/// Summary>
Public struct MetadataDetail
{
Public string Hex; // a hexadecimal string
Public string RawValueAsString; // Original Value string
Public string DisplayValue; // display value string
}
# Endregion # region EXIF element structure
/// Summary>
/// Structure: stores EXIF Element Information
/// Summary>
Public struct Metadata
{
Public MetadataDetail EquipmentMake;
Public MetadataDetail CameraModel;
Public MetadataDetail ExposureTime; // specifies the exposure time.
Public MetadataDetail Fstop;
Public MetadataDetail DatePictureTaken;
Public MetadataDetail ShutterSpeed; // shutter speed
Public MetadataDetail MeteringMode; // exposure mode
Public MetadataDetail Flash; // flashlight
Public MetadataDetail XResolution;
Public MetadataDetail YResolution;
Public MetadataDetail ImageWidth; // photo width
Public MetadataDetail ImageHeight; // photo height public MetadataDetail FNumber; // F value, aperture count
Public MetadataDetail ExposureProg; // exposure Program
Public MetadataDetail SpectralSense ;//
Public MetadataDetail ISOSpeed; // ISO sensitivity
Public MetadataDetail OECF ;//
Public MetadataDetail Ver; // EXIF version
Public MetadataDetail CompConfig; // color settings
Public MetadataDetail CompBPP; // compression ratio
Public MetadataDetail Aperture; // Aperture Value
Public MetadataDetail Brightness; // Brightness Value Ev
Public MetadataDetail ExposureBias; // Exposure Compensation
Public MetadataDetail MaxAperture; // maximum aperture value public MetadataDetail SubjectDist; // subject distance
Public MetadataDetail LightSource; // White Balance
Public MetadataDetail FocalLength; // focal length
Public MetadataDetail FPXVer; // FlashPix version
Public MetadataDetail ColorSpace; // Color Space
Public MetadataDetail Interop ;//
Public MetadataDetail FlashEnergy ;//
Public MetadataDetail SpatialFR ;//
Public MetadataDetail FocalXRes ;//
Public MetadataDetail FocalYRes ;//
Public MetadataDetail FocalResUnit ;//
Public MetadataDetail ExposureIndex; // exposure index
Public MetadataDetail SensingMethod; // Sensing Method
Public MetadataDetail SceneType ;//
Public MetadataDetail CfaPattern ;//
}
# Endregion # region Query the EXIF element value
Public string LookupEXIFValue (string Description, string Value)
{
String DescriptionValue = null; switch (Description)
{
Case "MeteringMode": # regionMeteringMode
{
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;
}
}
# Endregionbreak;
Case "ResolutionUnit": # region ResolutionUnit
{
Switch (Value)
{
Case "1 ":
DescriptionValue = "No Units"; break;
Case "2 ":
DescriptionValue = "Inch"; break;
Case "3 ":
DescriptionValue = "Centimeter"; break;
}
} # Endregionbreak;
// Omitting N lines of similar code}
Return DescriptionValue;
}
# Endregion # region obtains the EXIF information of an image.
Public Metadata GetEXIFMetaData (string PhotoName)
{
// Create an image instance
System. Drawing. Image MyImage = System. Drawing. Image. FromFile (PhotoName );
// Create an integer array to store the ID of the attribute array in the image
Int [] MyPropertyIdList = MyImage. PropertyIdList;
// Create an instance of a closed image attribute array
PropertyItem [] MyPropertyItemList = new PropertyItem [MyPropertyIdList. Length];
// Create an instance structure object with image EXIT information, and assign the initial value # region to create an instance structure object with image EXIT information, and assign the Initial Value
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 code
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 initializes attribute values
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;
}
// Omitting N lines of similar code
}
# Endregionindex ++;
}
} 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
}
} Then there is a call question. With this class, how can I read The EXIF information of the image? The Code is as follows:
EXIFMetaData em = new EXIFMetaData ();
String filePath = Server. MapPath ("Test.jpg"); // You can dynamically transfer
EXIFMetaData. Metadata m = em. GetEXIFMetaData (filePath); // This is called. Upload the absolute path of the image.
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; do you have any questions? Please refer to it. This code has been tested and works properly.

Reprinted from: http://www.aspnetjia.com