private decimal ReadGPSCoordinates(ExifTagName property)
{
if (IsPropertyDefined(property))
{
byte[] data = GetProperty(property, null);
byte[] intnum = new byte[4];
byte[] intdenom = new byte[4];
Array.ConstrainedCopy(data, 0, intnum, 0, 4);
Array.ConstrainedCopy(data, 4, intdenom, 0, 4);
ExifRational deg = new ExifRational(convertToInt32(intnum), convertToInt32(intdenom));
Array.ConstrainedCopy(data, 8, intnum, 0, 4);
Array.ConstrainedCopy(data, 12, intdenom, 0, 4);
ExifRational min = new ExifRational(convertToInt32(intnum), convertToInt32(intdenom));
Array.ConstrainedCopy(data, 16, intnum, 0, 4);
Array.ConstrainedCopy(data, 20, intdenom, 0, 4);
ExifRational sec = new ExifRational(convertToInt32(intnum), convertToInt32(intdenom));
decimal coord = (decimal)(deg.ToInt32() + (decimal)(min.ToFloat() / 60) + (decimal)(sec.ToFloat() / 3600));
return(coord);
}
else
{
return(decimal.Zero);
}
}
private ExifRational ParseRationalValue(byte[] data)
{
byte[] nom = new byte[4], den = new byte[4];
Array.Copy(data, 0, nom, 0, 4);
Array.Copy(data, 4, den, 0, 4);
ExifRational rat = new ExifRational();
rat.Denominator = this.ParseIntValue(den);
rat.Numerator = this.ParseIntValue(nom);
return(rat);
}
public string GetProperty(int propertyID)
{
if (this.disposed)
{
throw new ObjectDisposedException("ExifMetadata");
}
if (this.IsPropertyDefined(propertyID))
{
PropertyItem prop = this.image.Image.GetPropertyItem(propertyID);
if (prop.Type == 0x1)
{
//1 = BYTE An 8-bit unsigned integer.,
return(prop.Value[0].ToString());
}
else if (prop.Type == 0x2)
{
//2 = ASCII An 8-bit byte containing one 7-bit ASCII code. The final byte is terminated with NULL.,
return(GetPropertyStringASCII(propertyID, ""));
}
else if (prop.Type == 0x3)
{
//3 = SHORT A 16-bit (2 -byte) unsigned integer,
return(GetPropertyShort(propertyID, 0).ToString());
}
else if (prop.Type == 0x4)
{
//4 = LONG A 32-bit (4 -byte) unsigned integer,
return(GetPropertyInt(propertyID, 0).ToString());
}
else if (prop.Type == 0x5)
{
//5 = RATIONAL Two LONGs. The first LONG is the numerator and the second LONG expresses the//denominator.,
return(GetPropertyRational(propertyID).ToString("."));
}
else if (prop.Type == 0x7)
{
//7 = UNDEFINED An 8-bit byte that can take any value depending on the field definition,
return(prop.Value[0].ToString());
}
else if (prop.Type == 0x9)
{
//9 = SLONG A 32-bit (4 -byte) signed integer (2's complement notation),
return(convertToInt32(prop.Value).ToString());
}
else if (prop.Type == 0xA)
{
//10 = SRATIONAL Two SLONGs. The first SLONG is the numerator and the second SLONG is the
//denominator.
// rational
byte[] n = new byte[prop.Len / 2];
byte[] d = new byte[prop.Len / 2];
Array.Copy(prop.Value, 0, n, 0, prop.Len / 2);
Array.Copy(prop.Value, prop.Len / 2, d, 0, prop.Len / 2);
int a = convertToInt32(n);
int b = convertToInt32(d);
ExifRational r = new ExifRational(a, b);
r.ToString(".");
}
}
return(string.Empty);
}
