private void ReadMetadata(string filename, bool openForEditing)
{
// Save filename
this.sourceFilename = filename;
this.destinationfilename = filename;
this.openForEditing = openForEditing;
// If open for editing, do additional checks
if (openForEditing)
{
// Validate the threading model
WpfFileManager.ValidateThreadingModel();
// The file must be JPG because the TIFF padding queries are different
WpfFileManager.ValidateFileIsJpeg(filename);
// Create backup of the file so you can read and write to different files
string tempFile = filename + ".fotoflytemp";
File.Copy(filename, tempFile, true);
// Replace the filename with the temp filename
this.sourceFilename = tempFile;
}
this.ReadMetadata();
if (openForEditing)
{
// Ensure the metadata has the right padding in place for new data
this.AddMetadataPadding();
}
}
public static void WriteBitmapMetadata(string outputFile, BitmapMetadata bitmapMetadata, int retryCount)
{
// Check file exists and is a valid jpg\jpeg file
WpfFileManager.ValidateFileIsJpeg(outputFile);
// Validate Threading Model
WpfFileManager.ValidateThreadingModel();
// Source file is is used as source of the the image & thumbnail for the new file
string sourceFile = outputFile.ToLower().Replace(".jpg", ".fotoflytmp");
// Try saving the file as needed
bool fileSaved = false;
while (true)
{
if (fileSaved || retryCount == 0)
{
break;
}
// Copy file so we have a source file
try
{
if (File.Exists(sourceFile))
{
File.Delete(sourceFile);
}
File.Move(outputFile, sourceFile);
}
catch (Exception e)
{
throw new Exception("Unable to create the backup file.", e);
}
try
{
WpfFileManager.WriteBitmapMetadata(outputFile, bitmapMetadata, sourceFile);
File.Delete(sourceFile);
fileSaved = true;
}
catch (Exception e)
{
Debug.WriteLine(e.ToString());
fileSaved = false;
retryCount--;
}
// Save file failed so restore files to original location
if (!fileSaved)
{
try
{
File.Delete(outputFile);
File.Move(sourceFile, outputFile);
}
catch (Exception e)
{
throw new Exception("Unable to recover from failed save\n" + e);
}
}
}
if (!fileSaved)
{
throw new Exception("Unable to save the file:\n\n" + outputFile);
}
}