public static IWICBitmapDecoder CreateDecoderFromFilename(this IWICImagingFactory imagingFactory, string wzFilename, Guid?pguidVendor = null, WICDecodeOptions metadataOptions = WICDecodeOptions.WICDecodeMetadataCacheOnDemand)
{
using (var pguidVendorPtr = CoTaskMemPtr.From(pguidVendor))
{
return(imagingFactory.CreateDecoderFromFilename(wzFilename, pguidVendorPtr, StreamAccessMode.GENERIC_READ, metadataOptions));
}
}
public static IComObject <IWICBitmapDecoder> CreateDecoderFromFilename(this IWICImagingFactory factory, string fileName, Guid?guidVendor = null, FileAccess desiredAccess = FileAccess.Read, WICDecodeOptions metadataOptions = WICDecodeOptions.WICDecodeMetadataCacheOnDemand)
{
if (factory == null)
{
throw new ArgumentNullException(nameof(factory));
}
if (fileName == null)
{
throw new ArgumentNullException(nameof(factory));
}
const uint GENERIC_READ = 0x80000000;
const uint GENERIC_WRITE = 0x40000000;
using (var guid = new ComMemory(guidVendor))
{
uint acc = 0;
if (desiredAccess.HasFlag(FileAccess.Read))
{
acc |= GENERIC_READ;
}
if (desiredAccess.HasFlag(FileAccess.Read))
{
acc |= GENERIC_WRITE;
}
factory.CreateDecoderFromFilename(fileName, guid.Pointer, acc, metadataOptions, out var value).ThrowOnError();
return(new ComObject <IWICBitmapDecoder>(value));
}
}
static void Main(string[] args)
{
IWICImagingFactory factory = (IWICImagingFactory) new WICImagingFactory();
IWICBitmapDecoder decoder = null;
IWICBitmapFrameDecode frame = null;
IWICFormatConverter formatConverter = null;
try
{
const string filename = @"<filename>";
decoder = factory.CreateDecoderFromFilename(filename, null, NativeMethods.GenericAccessRights.GENERIC_READ,
WICDecodeOptions.WICDecodeMetadataCacheOnDemand);
uint count = decoder.GetFrameCount();
frame = decoder.GetFrame(0);
uint width = 0;
uint height = 0;
frame.GetSize(out width, out height);
Guid pixelFormat;
frame.GetPixelFormat(out pixelFormat);
// The frame can use many different pixel formats.
// You can copy the raw pixel values by calling "frame.CopyPixels( )".
// This method needs a buffer that can hold all bytes.
// The total number of bytes is: width x height x bytes per pixel
// The disadvantage of this solution is that you have to deal with all possible pixel formats.
// You can make your life easy by converting the frame to a pixel format of
// your choice. The code below shows how to convert the pixel format to 24-bit RGB.
formatConverter = factory.CreateFormatConverter();
formatConverter.Initialize(frame,
Consts.GUID_WICPixelFormat24bppRGB,
WICBitmapDitherType.WICBitmapDitherTypeNone,
null,
0.0,
WICBitmapPaletteType.WICBitmapPaletteTypeCustom);
uint bytesPerPixel = 3; // Because we have converted the frame to 24-bit RGB
uint stride = width * bytesPerPixel;
byte[] bytes = new byte[stride * height];
formatConverter.CopyPixels(null, stride, stride * height, bytes);
}
finally
{
frame.ReleaseComObject();
decoder.ReleaseComObject();
factory.ReleaseComObject();
}
}
public static IWICBitmapFrameDecode Load(this IWICImagingFactory factory, string fileName)
{
if (factory == null)
{
throw new ArgumentNullException("factory");
}
if (fileName == null)
{
throw new ArgumentNullException("fileName");
}
IWICBitmapDecoder iwicbitmapDecoder = factory.CreateDecoderFromFilename(fileName, null, GenericAccess.GENERIC_READ, WICDecodeOptions.WICDecodeMetadataCacheOnDemand);
IWICBitmapFrameDecode result;
iwicbitmapDecoder.GetFrame(0, out result);
GraphicsInteropNativeMethods.SafeReleaseComObject(iwicbitmapDecoder);
return(result);
}
private void filesListView_SelectedIndexChanged(object sender, EventArgs e)
{
if (filesListView.SelectedItems.Count > 0)
{
string file = filesListView.SelectedItems[0].Text;
if (decoder != null)
{
decoder.ReleaseComObject();
decoder = null;
}
if (frame != null)
{
frame.ReleaseComObject();
frame = null;
}
IWICImagingFactory factory = (IWICImagingFactory) new WICImagingFactory();
decoder = factory.CreateDecoderFromFilename(file, null, NativeMethods.GenericAccessRights.GENERIC_READ, WICDecodeOptions.WICDecodeMetadataCacheOnLoad);
if (decoder != null)
{
uint frameCount = decoder.GetFrameCount();
if (frameCount > 0)
{
frame = decoder.GetFrame(0);
}
if (frame != null)
{
setupMode = true;
SetupDevelopRaw();
setupMode = false;
DisplayImage();
}
}
factory.ReleaseComObject();
}
}