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Re: knowing when WebView is done

Subject: Re: knowing when WebView is done
From: Timothy Ritchey <email@hidden>
Date: Sat, 07 Jun 2008 01:06:44 -0400
Delivered-to: email@hidden
Delivered-to: email@hidden

Out of curiosity, did you ever check the retain counts on your webview objects?

I create my webview with:

- (void)setUrl:(NSString *)value
{
    [self willChangeValueForKey:@"url"];
    [self setPrimitiveUrl:value];
    [self didChangeValueForKey:@"url"];

NSRect rect = NSMakeRect(0, 0, 900, 1164); webView = [[WebView alloc] initWithFrame:rect frameName:@"MyFrame" groupName:@"MyGroup"]; [webView setFrameLoadDelegate:self]; [webView setMainFrameURL:value]; }

and then do the following:

- (void)webView:(WebView *)sender didFinishLoadForFrame:(WebFrame *)frame { if(frame == [sender mainFrame]) {

        ... grab thumbnail image ...

        [webView stopLoading:nil];
        [webView setFrameLoadDelegate:nil];
        NSLog(@"retain count (before): %d", CFGetRetainCount(webView));
        [webView release];
        NSLog(@"retain count (after): %d", CFGetRetainCount(webView));
    }
}

and the log file shows a retain count of 2 before, and 1 after. Something else is holding onto my webView, or it has been so long since I've programmed cocoa in anger that I've lost all sense of alloc/ init behavior.

Cheers,
Tim R.

On Jun 6, 2008, at 7:06 PM, Adam R. Maxwell wrote:

On Jun 5, 2008, at 7:03 PM, Timothy Ritchey wrote:
even if I track frame commit/finish load as suggested in the thread, if I try to get rid of the webview, the world falls down around me when it can't push out that last delegate call of didReceiveTitle.
I generally send stopLoading: to a webview before disposing of it (and set any delegates to nil).

I tried even counting title/icon, etc. and that didn't even help (you can see there are two calls to the title delegate, both for the main frame. There just doesn't appear to be a deterministic way to figure out when WebView is actually done, and safe to release.
Have you tried using -isLoading in the didFinishLoadForFrame: delegate method? After seeing this thread, I switched my own webview thumbnailing code to use that, since previously I was just checking to see if the main frame finished loading. Seems to work.
--
adam


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Follow-Ups:
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References:
	>Re: knowing when WebView is done (From: Mark Bateman <email@hidden>)
	>Re: knowing when WebView is done (From: Rush Manbert <email@hidden>)
	>Re: knowing when WebView is done (From: Timothy Ritchey <email@hidden>)
	>Re: knowing when WebView is done (From: "Adam R. Maxwell" <email@hidden>)

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