[Mac] Exception reading specific SVG

[msasso69]

Prerequisites

• I have written a descriptive issue title
• I have verified that I am using the latest version of Magick.NET
• I have searched open and closed issues to ensure it has not already been reported

Description

I'm getting the exception ImageMagick.MagickMissingDelegateErrorException with the following Message:

NoDecodeDelegateForThisImageFormat `' @ error/blob.c/BlobToImage/458

while reading the following SVG file:

https://dev.w3.org/SVG/tools/svgweb/samples/svg-files/faux-art.svg

Here is the full stack trace:

  at ImageMagick.NativeInstance.CheckException (System.IntPtr exception, System.IntPtr result) [0x00027] in <bdbee08fe08849448c412eacc5f05d9e>:0 
  at ImageMagick.MagickImage+NativeMagickImage.ReadBlob (ImageMagick.IMagickSettings`1[TQuantumType] settings, System.Byte[] data, System.Int32 offset, System.Int32 length) [0x00052] in <bdbee08fe08849448c412eacc5f05d9e>:0 
  at ImageMagick.MagickImage.Read (System.Byte[] data, System.Int32 offset, System.Int32 length, ImageMagick.IMagickReadSettings`1[TQuantumType] readSettings, System.Boolean ping) [0x00029] in <bdbee08fe08849448c412eacc5f05d9e>:0 
  at ImageMagick.MagickImage.Read (System.Byte[] data, ImageMagick.IMagickReadSettings`1[TQuantumType] readSettings) [0x0000b] in <bdbee08fe08849448c412eacc5f05d9e>:0 
  at ImageMagick.MagickImage.Read (System.Byte[] data) [0x00000] in <bdbee08fe08849448c412eacc5f05d9e>:0 
  at ImageMagick.MagickImage..ctor (System.Byte[] data) [0x00006] in <bdbee08fe08849448c412eacc5f05d9e>:0 
  at VisualSEO.EtoFormGui.Program.Main (System.String[] args) [0x00075] in /Users/massi/VSeo/VSSRepo/EtoFormGui.Mac/Program.cs:3103 

Steps to Reproduce

Run the following repro to reproduce the exception:

using System;
using System.IO;
using System.Net;
namespace VisualSEO.EtoFormGui
{
	public class Program
	{
		[STAThread]
		public static void Main(string[] args)
		{
			var url = "https://dev.w3.org/SVG/tools/svgweb/samples/svg-files/faux-art.svg";
			try
			{
				Uri reqUri = new Uri(url);
				HttpWebRequest req = WebRequest.Create(reqUri) as HttpWebRequest;
				using (HttpWebResponse webResp = req.GetResponse() as HttpWebResponse)
				{
					byte[] buffer = new byte[32768];
					using (Stream respStream = webResp.GetResponseStream())
					{
						using (MemoryStream ms1 = new MemoryStream())
						{
							int chunkLen = respStream.Read(buffer, 0, buffer.Length);
							ms1.Write(buffer, 0, chunkLen);
							ms1.Position = 0;
							byte[] bytes = ms1.ToArray();
							ImageMagick.MagickImage img = new ImageMagick.MagickImage(bytes);
						}
					}
				}
			}
			catch (Exception ex)
			{
				System.Diagnostics.Debug.WriteLine(ex.Message);
			}
		}
	}
}

System Configuration

• Magick.NET version: 7.22.2.1
• Environment (Operating system, version and so on): macOS 10.15.6
• Additional information:

[dlemstra]

ImageMagick cannot detect that the issue is an SVG file because the file starts with a comment. If you tell Magick.NET that the file is an SVG file when reading it you should be able to read the image.

[msasso69]

Thanks, it works :)