internal StreamWrapper(Stream stream)
{
_Stream = stream ?? throw new ArgumentNullException();
_Buffer = new byte[0];
Interop = new InteropStream
{
Read = Read,
Write = Write,
Seek = Seek
};
}
private void Unload()
{
if (this.currentHandler != null)
{
this.currentHandler.Unload();
Marshal.FinalReleaseComObject(this.currentHandler);
this.currentHandler = null;
}
if (this.stream != null)
{
this.stream.Dispose();
this.stream = null;
}
}
internal static extern int DecompressSlices(InteropStream inputStream, InteropSliceWriter outputStream, ushort index, ushort count);
internal static extern int DecompressVolume(InteropStream inputStream, InteropSliceWriter outputStream);
internal static extern int CompressVolume(InteropSliceReader inputStream, InteropStream outputStream, ushort width, ushort height, [MarshalAs(UnmanagedType.LPStr)] string encoderName, [MarshalAs(UnmanagedType.LPStr)] string pixelFormat, [MarshalAs(UnmanagedType.LPStr)] string options, int bitrate);
public void AttachPreview(IntPtr handler, Rect viewRect, string extension, string filePath,
Stream sourceStream)
{
this.Unload();
var classKey = GetPreviewHandlerKey(extension);
if (classKey == null)
{
return;
}
var guid = new Guid(classKey.GetValue(string.Empty).ToString());
var type = Type.GetTypeFromCLSID(guid, true);
var instance = Activator.CreateInstance(type);
var fileInit = instance as IInitializeWithFile;
var streamInit = instance as IInitializeWithStream;
if (streamInit != null && sourceStream != null)
{
this.stream = new InteropStream(sourceStream);
streamInit.Initialize(this.stream, 0);
}
else if (fileInit != null)
{
if (filePath != null)
{
fileInit.Initialize(filePath, 0);
}
else if (sourceStream != null)
{
using (var tempFile = new TempFile()) {
using (var fileStream = File.Create(tempFile.Path))
sourceStream.CopyTo(fileStream);
fileInit.Initialize(tempFile.Path, 0);
}
}
else
{
return;
}
}
else
{
return;
}
this.currentHandler = instance as IPreviewHandler;
if (this.currentHandler == null)
{
this.Unload();
return;
}
var rect = new ShellRect(viewRect);
this.currentHandler.SetWindow(handler, ref rect);
this.currentHandler.SetRect(ref rect);
try {
this.currentHandler.DoPreview();
} catch {
this.Unload();
throw;
}
}
