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webView.LoadHtml() is not loading image

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jkelly

Posted: Friday, December 1, 2017 8:25:39 AM

Rank: Advanced Member
Groups: Member

Joined: 2/26/2015
Posts: 53

I'm having an issue using LoadHtml, where text shows fine but showing an image just gives me a blank rectangle.

Below of my code snippet. The text "test" shows but my valid image path doesn't show the image.

When I viewsource and copy and paste the html generated and put into a file and view in a browser, it works fine.

Code: C#

Copy

webView1.LoadHtml("&lt;HTML&gt;" +
                                    "&lt;BODY&gt;test" +
                                    "&lt;img src=\"file://C:\\file_path\\Image.png\" height=\"100%\" width=\"100%\"&gt;" +
                                    "&lt;/BODY&gt;" +
                                    "&lt;/HTML&gt;");

eo_support

Posted: Saturday, December 2, 2017 9:55:38 PM

Rank: Administration
Groups: Administration

Joined: 5/27/2007
Posts: 24,221

Hi,

This has to do with Chromium browser engine's web security policy. The basic rules are:

1. Only a file scheme page can load a file scheme resource. So for example, if an Internet based page try to have an image with local file path. the request to that image will be denied;

2. Rule 1 does not apply if EnableWebSecurity is turned off:

https://www.essentialobjects.com/doc/eo.webengine.browseroptions.enablewebsecurity.aspx

To workaround rule 1, you would need to make sure the WebView's current scheme is a file scheme. So if you call WebView.LoadUrl to load a local file Url first, you will be able to call LoadHtml to load HTML that references local resources. Alternatively, you can apply rule 2 by setting EnableWebSecurity to false. See here for more details on how to use this option:

https://www.essentialobjects.com/doc/webbrowser/advanced/browser_options.aspx

Hope this helps. Please let us know if you still have any questions.

Thanks!

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