Exif and IPTC Reading and Writing

[murratore]

Hi there

Does somebody know a class library which offers basic image manipulation and also gets and sets exif and iptc metadata? If possible for free...I found some components, but these were quite too expensive...(max 40$).

thx for any recommendation!

 

[chrissie1]

the image class has the possibility to read an write these attributes. Look at the propertyitems property.

Christiaan Baes
Belgium

I just like this --> [Wiggle] [Wiggle]

 

[jamsek19]

This is my class to get EXIF info from regular .jpg picture

using System;
using System.Text;
using System.Collections;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;

namespace CreateHTML {

/* This classs was rewrited from EXIF.py script from Gene Cash
Contains code from "exifdump.py" originally written by Thierry Bousch
<bousch@topo.math.u-psud.fr> and released into the public domain.

Updated and turned into general-purpose library by Gene Cash
<email gcash at cfl.rr.com>
Copyright 2002 All rights reserved

*/

public class GetExifInfo {

public const int EXIF_ORIGDATE = 36867;
public const int EXIF_USERCMNT = 37510;

private string mFile;
private PropertyItem[] mPropItems;

public string FileName {
set {
if (value != "" && value != mFile) {
mFile = value;
GetExifProperties();
}
}
}

public GetExifInfo(string aFile) {
mFile = aFile;
GetExifProperties();
}

/* public override string ToString() {
string line = "";
foreach (PropertyItem prop in mPropItems) {
line = line + prop.Id + " - " + prop.Type + " - " + ByteToString(prop.Value) + "\n";
}
return line;
} */



private string UniToCode(params byte[] aBytes) {
StringBuilder sb = new StringBuilder();

foreach (byte byt in aBytes) {
switch ((int) byt) {
case 154: {
sb.Append("š");
break;
}
case 240: {
sb.Append("ð");
break;
}
case 232: {
sb.Append("è");
break;
}
case 230: {
sb.Append("æ");
break;
}
case 158: {
sb.Append("ž");
break;
}
case 138: {
sb.Append("Š");
break;
}
case 208: {
sb.Append("Ð");
break;
}
case 200: {
sb.Append("È");
break;
}
case 198: {
sb.Append("Æ");
break;
}
case 142: {
sb.Append("Ž");
break;
}
default: {
sb.Append((char) byt);
break;
}
}
}
return sb.ToString();
}

public GetExifInfo() {
mFile = "";
}

public string Info(int aInfoType, Encoding aEncod) {
return aEncod.GetString(GetInfo(aInfoType));
}

public string Info(int aInfoType) {
RunMain.gLog.WriteLog("EXIF Info for file " + mFile + "\n" + HexInfo(aInfoType,10));
if (aInfoType == EXIF_USERCMNT) {
byte[] bytStr = GetInfo(aInfoType);
string retv = UniToCode(bytStr);
return retv.Substring(8, retv.Length - 8).Replace((char)0,' ').Trim();
}
else return Encoding.ASCII.GetString(GetInfo(aInfoType)).Replace((char) 0, ' ').Trim();
}

public string HexInfo(int aInfoType, int aCols) {
string retvHex = "";
int poz = 0;
int tcol = 0;
byte[] bts = GetInfo(aInfoType);
foreach (byte bt in bts) {
if (aInfoType == EXIF_USERCMNT) {
if (poz > 7) {
if (poz < bts.Length - 3) {
if (
(bts[poz] == (char) 0 &&
bts[poz + 1] == (char) 0 &&
bts[poz + 2] == (char) 0) ||
(bts[poz] == (char) 32 &&
bts[poz + 1] == (char) 32 &&
bts[poz + 2] == (char) 32) ||
(bts[poz] == (char) 46 &&
bts[poz + 1] == (char) 46 &&
bts[poz + 2] == (char) 46)
) {
return retvHex;
}
}
if (tcol == aCols) {
retvHex += "\n";
tcol = 0;
}
tcol++;
retvHex = retvHex + String.Format("{0:x2}", (int) bt) + " ";
}
poz++;
}
else {
if (tcol == aCols) {
retvHex += "\n";
tcol = 0;
}
tcol++;
retvHex = retvHex + String.Format("{0:x2}", (int) bt) + " ";
}
}
return retvHex;
}

private byte[] GetInfo(int aInfoType) {
foreach (PropertyItem prop in mPropItems) {
if (prop.Id == aInfoType) return prop.Value;
}
byte[] b = new byte[1];
return b;
}

private void GetExifProperties() {
RunMain.gLog.WriteLog("GetExifProperties for file " + mFile);
FileStream stream = new FileStream(mFile, FileMode.Open, FileAccess.Read);
Image image = Image.FromStream(stream, true, false);
mPropItems = image.PropertyItems;
stream.Close();
}
}
}