/// <summary>
/// Gets the GPS time offset from EXIF timestamp
/// assumes no camera date set 10years in future, but may be 10years behind if reset to default
/// </summary>
/// <param name="filename"></param>
/// <returns>
/// float to 0.05 hr +12 -> -12 valid, 99999 not an image, 99901 no GPS time
/// camera name
/// </returns>
public static CameraTimeOffset GetEXIFtime_diff(string filename)
{
Exif_Ext.EXIF_Data exif_Data = new Exif_Ext.EXIF_Data(filename);
switch (exif_Data.Status)
{
case "ok":
if (exif_Data.CameraName is null)
{
exif_Data.CameraName = "---";
}
if (exif_Data.GPSUTCDate == DateTime.MinValue)
{
return(new CameraTimeOffset(exif_Data.CameraName, 99901));
}
DateTime localGPStime = GPSMethods.GetLocalTimefromGPS(exif_Data.GPSLatitude, exif_Data.GPSLongitude, exif_Data.GPSUTCDate);
TimeSpan lastCameraOffset = exif_Data.CameraDate.Subtract(localGPStime);
//float timedif = (float)Math.Round(lastCameraOffset.TotalHours,1);
double roundto = 0.05;
float timedif = (float)(Math.Ceiling(lastCameraOffset.TotalHours / roundto) * roundto);
CameraTimeOffset thisOffset = new CameraTimeOffset(exif_Data.CameraName, -1 * timedif);
return(thisOffset);
case "Not Image":
return(new CameraTimeOffset("Not Image", 99999));
default:
//error occurred
return(new CameraTimeOffset("Exception", 99999));
}
}
private void Makelist(DirectoryInfo di)
{
RaiseProgress("Creating image list..", 10);
FileInfo[] availFiles = di.GetFiles();
int maxFiles = availFiles.Length;
int filenum = 0;
#region make the list
foreach (FileInfo thisPhotoFile in di.GetFiles())
{
filenum++;
int percentdone = Convert.ToInt32(filenum * 100.0 / maxFiles);
if (filenum % 5 == 0)
{
RaiseProgress(string.Format("processing image #{0}", filenum), Convert.ToInt32(10 + percentdone / 2));
}
PhotoDetail thisPhoto = new PhotoDetail
{
latitude = -99 //cant be plotted
};
//test if it is a valid image
switch (thisPhotoFile.Extension.ToUpper())
{
case ".JPG":
case ".JPEG":
case ".TIFF":
thisPhoto.Description = thisPhotoFile.Name;
Exif_Ext.EXIF_Data exif = new Exif_Ext.EXIF_Data(thisPhotoFile.FullName);
DateTime dateTaken = exif.CameraDate;
if (exif.GPSLatitude == 0)
{
break;
}
if (exif.GPSLatitude == -999)
{
break;
}
//if(exif.GPSUTCDate > DateTime.MinValue && UseGPSDate)
//{
// dateTaken = GPSMethods.GetLocalTimefromGPS(exif.GPSLatitude, exif.GPSLongitude, exif.GPSUTCDate);
//}
thisPhoto.latitude = exif.GPSLatitude;
thisPhoto.longitude = exif.GPSLongitude;
thisPhoto.DateTaken = dateTaken;
if (SortByDateTaken)
{
thisPhoto.keyid = thisPhoto.DateTaken.ToString("yyyyMMdd-HHmmss");
}
else
{
thisPhoto.keyid = thisPhoto.Description;
}
break;
default:
//ignore unsupperted files
break;
}
//now attempt to load to the list. may generate duplicate key.
int retry = 0;
string originalkeyid = thisPhoto.keyid;
if (thisPhoto.latitude > -99)
{
do
{
if (retry > 0)
{
thisPhoto.keyid = string.Format("{0}{1:00}", originalkeyid, retry);
}
thisPhoto.ThumbnailFilename = Path.Combine(thumbFolder, thisPhoto.keyid + thisPhotoFile.Extension);
thisPhoto.ImageFilename = Path.Combine(imageFolder, thisPhoto.keyid + thisPhotoFile.Extension);
try
{
//save the data to the Sorted list
inputPhotos.Add(thisPhoto.keyid, thisPhoto);
retry = 0;
}
catch (ArgumentException)
{
retry++;
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
throw;
}
} while (retry > 0);
//now have unique id, create the smaller images and thumbnails
ResizeImages(thisPhotoFile, thisPhoto);
}
}
#endregion
}