Sandbox, local pages and DesktopHTMLViewer

Targets macOS
1

Anyone have an updated code working with last version of XOJO and DesktopHTMLViewer.

I cannot display the content from a local website when an app is sandboxed

This code seems to fix it for old versions of Xojo
https://ohanaware.com/blog/202150/WKWebKit,-Xojo-HTMLViewer-and-App-Sandbox.html

2

Pretty much everything I want to say would get me kicked off this forum and branded as a Troll, so I’ll show myself out, before it’s too late.

4 Likes
3

What kind of local website are you talking about ?

I use html files in all my apps to display help, and that includes apps sandboxed to go to the MAS.

Could you post your code ?

I just verified with DesktopHTMLViewer that it works with html files on my hard disk. The app is sandboxed as for the MAS.

Here is my code in a button:

Var f As FolderItem

f = FolderItem.ShowOpenFileDialog("text/html")
If f <> Nil Then
  HTMLViewer1.LoadPage(f)
Else
  MessageBox("Open failed.")
End If
4

The code works when you load a page but if you save the file path and read it from a prefs, the content is not loaded. I’m tried all solutions like adding file:/// . Blank page.

5

If you always load from Resources, for instance, you can simply save the name of the file instead of the url.

If the path changes, perhaps you can do something like:

var f as folderitem
f = new folderitem(path, folderitem.native)
HTMLViewer1.LoadPage(f)
6

If the new release is not working, and they broke the workaround, see if you can aply for the 90-day money back guarantee. it is not fair to waste money in something that is not working. See if you can use the old HTMLViewer

7

This is the code I use for the DesktopHTMLViewer. Just tested in 2022r3.2 and it worked.

Private Sub GrantAccessToFolder(inFolder as FolderItem)
  #if (TargetMacOS) AND (XojoVersion >= 2020.01) then
    // copied from https://forum.xojo.com/t/new-problem-with-htmlviewer-loadpage-since-version-2020-r1/56514/7
    // --- Originally created in July 2020. <--- Leave this info here so it's easier to track which version of the code.
    //     Published Sep 1st 2020.
    //     written by Sam Rowlands of Ohanaware.com
    //     Apple documentation for this API: https://developer.apple.com/documentation/webkit/wkwebview/1414973-loadfileurl?language=objc
    
    Declare Function NSClassFromString Lib "Foundation" (inClassName As CFStringRef) As Integer
    Declare Function NSURLfileURLWithPathIsDirectory Lib "Foundation" Selector "fileURLWithPath:isDirectory:" (NSURLClass As Integer, path As CFStringRef, directory As Boolean) As Integer
    Declare Function WKWebViewloadFileURL Lib "WebKit" Selector "loadFileURL:allowingReadAccessToURL:" (HTMLViewer As Ptr, URL As Integer, readAccessURL As Integer) As Integer
    
    // --- Create a NSURL object from a Xojo Folderitem.
    DIM folderURL As Integer = NSURLfileURLWithPathIsDirectory(NSClassFromString("NSURL"), inFolder.NativePath, inFolder.IsFolder)
    
    // --- This bit is not technically correct. The first parameter after the instance should actually be the page that you're trying to load.
    //     But as we're not loading a page per say... For the purpose of just setting access rights, we ignore the return
    //     value as we don't need to display progress.
    Call WKWebViewloadFileURL(me.Handle, folderURL, folderURL)
  #EndIf
End Sub
1 Like
8

If you use MBS Xojo Plugins, you can go from a DesktopHTMLViewer to a WKWebViewMBS.

And this allows you to use LoadFileURL function:
LoadFileURL(File as FolderItem, readAccessItem as FolderItem)