Local images are not shown

Hi,

Local images are not being shown inside the plugin

In the .md file I’m reading, two images are present in the code:

![01](01.png)
![02](02.png)

Both images are in the same directory of readme.md file, no need to absolute path or subdirectories Both images are PNG with 1192 x 836 resolution

When the .md is exported to html, the images appear correctly

<img src="01.png" alt="01" />
<img src="02.png" alt="02" />

[Tontyna]

The file:/// trick isn’t a good idea unless you wanna restrict yourself and your md files to MarkdownViewer++. Forget about “Export to HTML”.

[Wallby]

I think that the issue is because of…

InvalidOperationException This instance represents a relative URI, and this property is valid only for absolute URIs.

_https://docs.microsoft.com/en-us/dotnet/api/system.uri.scheme?view=net-6.0_

… and…

InvalidOperationException This instance represents a relative URI, and this property is valid only for absolute URIs.

_https://docs.microsoft.com/en-us/dotnet/api/system.uri.localpath?view=net-6.0#system-uri-localpath_

I haven’t tested the following diff, but it seems that it should address all issues I think…

In MarkdownViewerRenderer.cs…

//Get some file information
string src = imageLoadEvent.Src;
Uri uri = new Uri(src);
string extension = Path.GetExtension(src);

+ if(uri.IsAbsoluteUri)
+ {
-    //Check if local file or web resource
+    //Check if local file from absolute path or web resource
    switch (uri.Scheme.ToLowerInvariant())
    {
        case "file":
            //In case of a local file -> Try to load it directly
            imageLoadEvent.Handled = true; //Tell the event it was handled, so no error border is drawn
            ThreadPool.QueueUserWorkItem(state => LoadImageFromFile(src, imageLoadEvent));
            break;
        case "http":
        case "https":
            //For web resources check extension and parameter, to fetch from e.g. "badge" creating sources
            if ((extension != null && extension.Equals(".svg", StringComparison.OrdinalIgnoreCase))
                || uri.ToString().Contains("svg="))
            {
                //In case of a web resource file -> Load async
                using (WebClient webClient = new WebClient())
                {
                    imageLoadEvent.Handled = true; //Tell the event it was handled, so no error border is drawn
                    webClient.DownloadDataCompleted += (downloadSender, downloadEvent) => { OnDownloadDataCompleted(downloadEvent, imageLoadEvent); };
                    webClient.DownloadDataAsync(uri);
                }
            }
            break;
    }
+}
+else
+{
+    //Local file from relative path -> Try to load it directly
+    imageLoadEvent.Handled = true; //Tell the event it was handled, so no error border is drawn
+    ThreadPool.QueueUserWorkItem(state => LoadImageFromFile(@"file:///" + this.FileInfo.FileDirectory + "/" + src, imageLoadEvent));
+}

… and…

/// <summary>
/// 
/// </summary>
/// <param name="src"></param>
/// <param name="imageLoadEvent"></param>
protected void LoadImageFromFile(string src, HtmlImageLoadEventArgs imageLoadEvent)
{
    try
    {
        Uri uri = new Uri(src);
        //Try to load the file as Image from file
        //Remove the scheme first
        string srcWithoutScheme = src;
        int i = srcWithoutScheme.IndexOf(':');
        if (i > 0) srcWithoutScheme = srcWithoutScheme.Substring(i + 1).TrimStart('/');
-        //If not absolute, add the current file path
-        if (!Path.IsPathRooted(srcWithoutScheme))
-        {
-            uri = new Uri(@"file:///" + this.FileInfo.FileDirectory + "/" + srcWithoutScheme);
-        }

        //For SVG images: Convert to Bitmap
        string extension = Path.GetExtension(src);
        if (extension != null && extension.Equals(".svg", StringComparison.OrdinalIgnoreCase))
        {
            ConvertSvgToBitmap(SvgDocument.Open<SvgDocument>(uri.LocalPath), imageLoadEvent);
        }
        else
        {
            //Load uri, 8, 1
            imageLoadEvent.Callback((Bitmap)Image.FromFile(uri.LocalPath, true));
        }
    }
    catch { } //Not able to handle, refer back to orginal process
}