private void CreateAndShowMainWindow()
{
// Create the application's main window
mainWindow = new Window();
mainWindow.Title = "Image Metadata";
// <SnippetSetQuery>
Stream pngStream = new System.IO.FileStream("smiley.png", FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite);
PngBitmapDecoder pngDecoder = new PngBitmapDecoder(pngStream, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);
BitmapFrame pngFrame = pngDecoder.Frames[0];
InPlaceBitmapMetadataWriter pngInplace = pngFrame.CreateInPlaceBitmapMetadataWriter();
if (pngInplace.TrySave() == true)
{
pngInplace.SetQuery("/Text/Description", "Have a nice day.");
}
pngStream.Close();
// </SnippetSetQuery>
// Draw the Image
Image myImage = new Image();
myImage.Source = new BitmapImage(new Uri("smiley.png", UriKind.Relative));
myImage.Stretch = Stretch.None;
myImage.Margin = new Thickness(20);
// <SnippetGetQuery>
// Add the metadata of the bitmap image to the text block.
TextBlock myTextBlock = new TextBlock();
myTextBlock.Text = "The Description metadata of this image is: " + pngInplace.GetQuery("/Text/Description").ToString();
// </SnippetGetQuery>
// Define a StackPanel to host Controls
StackPanel myStackPanel = new StackPanel();
myStackPanel.Orientation = Orientation.Vertical;
myStackPanel.Height = 200;
myStackPanel.VerticalAlignment = VerticalAlignment.Top;
myStackPanel.HorizontalAlignment = HorizontalAlignment.Center;
// Add the Image and TextBlock to the parent Grid
myStackPanel.Children.Add(myImage);
myStackPanel.Children.Add(myTextBlock);
// Add the StackPanel as the Content of the Parent Window Object
mainWindow.Content = myStackPanel;
mainWindow.Show();
}
public static void SetImageMetadata(string imagesFolderPath)
{
string originalPath = @"C:\Users\test\Desktop\test.jpg";
string outputPath = Environment.CurrentDirectory + @"\output.jpg";
string finalPath = Environment.CurrentDirectory + @"\output_beforeInPlaceBitmapMetadataWriter.jpg";
BitmapCreateOptions createOptions = BitmapCreateOptions.PreservePixelFormat | BitmapCreateOptions.IgnoreColorProfile;
uint paddingAmount = 2048; // 2Kb padding for this example, but really this can be any value.
// Our recommendation is to keep this between 1Kb and 5Kb as most metadata updates are not large.
// High level overview:
// 1. Perform a lossles transcode on the JPEG
// 2. Add appropriate padding
// 3. Optionally add whatever metadata we need to add initially
// 4. Save the file
// 5. For sanity, we verify that we really did a lossless transcode
// 6. Open the new file and add metadata in-place
using (Stream originalFile = File.Open(originalPath, FileMode.Open, FileAccess.Read))
{
// Notice the BitmapCreateOptions and BitmapCacheOption. Using these options in the manner here
// will inform the JPEG decoder and encoder that we're doing a lossless transcode operation. If the
// encoder is anything but a JPEG encoder, then this no longer is a lossless operation.
// ( Details: Basically BitmapCreateOptions.PreservePixelFormat | BitmapCreateOptions.IgnoreColorProfile
// tell the decoder to use the original image bits and BitmapCacheOption.None tells the decoder to wait
// with decoding. So, at the time of encoding the JPEG encoder understands that the input was a JPEG
// and just copies over the image bits without decompressing and recompressing them. Hence, this is a
// lossless operation. )
BitmapDecoder original = BitmapDecoder.Create(originalFile, createOptions, BitmapCacheOption.None);
if (!original.CodecInfo.FileExtensions.Contains("jpg"))
{
Console.WriteLine("The file you passed in is not a JPEG.");
return;
}
JpegBitmapEncoder output = new JpegBitmapEncoder();
// If you're just interested in doing a lossless transcode without adding metadata, just do this:
//output.Frames = original.Frames;
// If you want to add metadata to the image using the InPlaceBitmapMetadataWriter, first add padding:
if (original.Frames[0] != null && original.Frames[0].Metadata != null)
{
// Your gut feel may want you to do something like:
// output.Frames = original.Frames;
// BitmapMetadata metadata = output.Frames[0].Metadata as BitmapMetadata;
// if (metadata != null)
// {
// metadata.SetQuery("/app1/ifd/PaddingSchema:Padding", paddingAmount);
// }
// However, the BitmapMetadata object is frozen. So, you need to clone the BitmapMetadata and then
// set the padding on it. Lastly, you need to create a "new" frame with the updated metadata.
BitmapMetadata metadata = original.Frames[0].Metadata.Clone() as BitmapMetadata;
// Of the metadata handlers that we ship in WIC, padding can only exist in IFD, EXIF, and XMP.
// Third parties implementing their own metadata handler may wish to support IWICFastMetadataEncoder
// and hence support padding as well.
metadata.SetQuery("/app1/ifd/PaddingSchema:Padding", paddingAmount);
metadata.SetQuery("/app1/ifd/exif/PaddingSchema:Padding", paddingAmount);
metadata.SetQuery("/xmp/PaddingSchema:Padding", paddingAmount);
// Since you're already adding metadata now, you can go ahead and add metadata up front.
metadata.SetQuery("/app1/ifd/{uint=897}", "hello there");
metadata.SetQuery("/app1/ifd/{uint=898}", "this is a test");
metadata.Title = "This is a title";
// Create a new frame identical to the one from the original image, except the metadata will have padding.
// Essentially we want to keep this as close as possible to:
// output.Frames = original.Frames;
output.Frames.Add(BitmapFrame.Create(original.Frames[0], original.Frames[0].Thumbnail, metadata, original.Frames[0].ColorContexts));
}
using (Stream outputFile = File.Open(outputPath, FileMode.Create, FileAccess.ReadWrite))
{
output.Save(outputFile);
}
}
// For sanity, let's verify that the original and the output contain image bits that are the same.
using (Stream originalFile = File.Open(originalPath, FileMode.Open, FileAccess.Read))
{
BitmapDecoder original = BitmapDecoder.Create(originalFile, createOptions, BitmapCacheOption.None);
using (Stream savedFile = File.Open(outputPath, FileMode.Open, FileAccess.Read))
{
BitmapDecoder output = BitmapDecoder.Create(savedFile, createOptions, BitmapCacheOption.None);
Compare(original.Frames[0], output.Frames[0], 0, "foo", Console.Out);
}
}
// Let's copy the file before we use the InPlaceBitmapMetadataWriter so that you can verify the metadata changes.
File.Copy(outputPath, finalPath, true);
Console.WriteLine();
// Now let's use the InPlaceBitmapMetadataWriter.
using (Stream savedFile = File.Open(outputPath, FileMode.Open, FileAccess.ReadWrite))
{
ConsoleColor originalColor = Console.ForegroundColor;
BitmapDecoder output = BitmapDecoder.Create(savedFile, BitmapCreateOptions.None, BitmapCacheOption.Default);
InPlaceBitmapMetadataWriter metadata = output.Frames[0].CreateInPlaceBitmapMetadataWriter();
// Within the InPlaceBitmapMetadataWriter, you can add, update, or remove metadata.
//metadata.SetQuery("/app1/ifd/{uint=899}", "this is a test of the InPlaceBitmapMetadataWriter");
//metadata.RemoveQuery("/app1/ifd/{uint=898}");
//metadata.SetQuery("/app1/ifd/{uint=897}", "Hello there!!");
Console.WriteLine("#####################");
Console.WriteLine(metadata.GetQuery(@"/app13/irb/8bimiptc/iptc/City"));
Console.WriteLine("#####################");
metadata.SetQuery(@"/app13/irb/8bimiptc/iptc/Headline", "TEst");
metadata.SetQuery(@"/app13/irb/8bimiptc/iptc/City", "TEst");
metadata.SetQuery(@"/app13/irb/8bimiptc/iptc/CountryPrimaryLocationName", "TEst");
metadata.SetQuery(@"/app13/irb/8bimiptc/iptc/ByLine", "TEst");
metadata.SetQuery(@"/app13/irb/8bimiptc/iptc/CaptionAbstract", "TEst");
Console.WriteLine("#####################");
Console.WriteLine(metadata.GetQuery(@"/app13/irb/8bimiptc/iptc/City"));
Console.WriteLine("#####################");
if (metadata.TrySave())
{
Console.ForegroundColor = ConsoleColor.Green;
Console.WriteLine("InPlaceMetadataWriter succeeded!");
}
else
{
Console.ForegroundColor = ConsoleColor.Red;
Console.WriteLine("InPlaceMetadataWriter failed!");
}
Console.ForegroundColor = originalColor;
}
FileInfo originalInfo = new FileInfo(originalPath);
FileInfo outputInfo = new FileInfo(outputPath);
FileInfo finalInfo = new FileInfo(finalPath);
Console.WriteLine(outputPath);
Console.WriteLine();
Console.WriteLine("Original File Size: \t\t\t{0}", originalInfo.Length);
Console.WriteLine("After Padding File Size: \t\t{0}", outputInfo.Length);
Console.WriteLine("After InPlaceBitmapWriter File Size: \t{0}", finalInfo.Length);
}