WKWebView* pointer causes EXC_BAD_ACCESS in AU Component

macOS
1

Hello all,

Now before we start, I realise that the webview component is experimental, however this is a potential bug that I’ve found. Specifically the IWebView::EvaluateJavaScript void in IPlugWebView.mm

Line 180 ( WKWebView* webView = ( __bridge WKWebView*) mWKWebView;) causes an EXC_BAD_ACCESS code=1.

This happens when EvaluateJavaScript is called while the plugin UI is closed, or closing as the webview object it’s trying to reference is no longer in memory I would assume.
Only happens with AU. VST3 does not cause this exception it would appear (better internal memory access exception handling? shrug).

I’ve tried creating a flag in CloseWebView(), but it doesn’t work to prevent line 180 from being called after the window closes, even if I wrap the whole contents of the EvaluateJavaScript void in an if statement to see if the flag is active.

Would appreciate any input anyone else has! Thank you.

2

Thanks for the report. There is a bug here where AUv2 plug-ins using WebViewEditorDelegate don’t call CloweWebView()… working on a fix

1 Like
3

Thank you for the very quick response!

4

Should be fixed now: WebViewEditorDelegate: Fix crash when closing the UI in AUv2 plug-ins. · iPlug2/iPlug2@f3be31f · GitHub

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5

Thank you so much! This has certainly fixed the issue.

Note: For anyone else reading this and performing a git pull, you’ll need to edit your Build Phases for each target in XCode to remove the “-fobjc-arc” compiler flag from every file in the Compile Sources section, except on IPlugWebView.mm