/// <summary>
/// Open a whole slide image.
/// This function can be expensive; avoid calling it unnecessarily. For example, a tile server should not call Open() on every tile request. Instead, it should maintain a cache of <see cref="OpenSlideImage"/> objects and reuse them when possible.
/// </summary>
/// <param name="filename">The filename to open.</param>
/// <returns>The <see cref="OpenSlideImage"/> object.</returns>
/// <exception cref="OpenSlideUnsupportedFormatException">The file format can not be recognized.</exception>
/// <exception cref="OpenSlideException">The file format is recognized, but an error occurred when opening the file.</exception>
public static OpenSlideImage Open(string filename)
{
// Open file using OpenSlide
var handle = OpenSlideInterop.Open(filename);
if (handle.IsInvalid)
{
throw new OpenSlideUnsupportedFormatException();
}
if (!ThrowHelper.TryCheckError(handle, out string errMsg))
{
handle.Dispose();
throw new OpenSlideException(errMsg);
}
return(new OpenSlideImage(handle));
}
public static OpenSlideImage Open(string filename)
{
FileInfo fileInfo = new FileInfo(filename);
// Open file using OpenSlide
IntPtr handle = Interop.Open(filename);
if (handle == IntPtr.Zero)
{
throw new OpenSlideUnsupportedFormatException();
}
if (!ThrowHelper.TryCheckError(handle, out string errMsg))
{
Interop.Close(handle);
throw new OpenSlideException(errMsg);
}
return(new OpenSlideImage(handle, fileInfo));
}