I entered a URL that triggers my handler, but I get this from the Xcode debug
log:
> 2014-10-20 07:42:08.968 MyApp[94134:303] *** Assertion failure in -[NSWindow
> setTitle:], /SourceCache/AppKit/AppKit-1265.21/AppKit.subproj/NSWindow.m:2901
> 2014-10-20 07:42:08.972 MyApp[94134:303] *** WebKit discarded an uncaught
> exception in the webView:didFinishLoadForFrame: delegate:
> <NSInternalInconsistencyException> Invalid parameter not satisfying: aString
> != nil
Here’s my -startLoading method. I tried “about:”, which is the only URL I
handle directly in the method.
> - (void)startLoading {
> NSAssert([self.class canInitWithRequest:self.request], @"Inappropriate
> request.");
> NSAssert(!self.processing, @"Receiving new protocol request while
> processing another.");
>
> // Handle the blank "about:" URL.
> NSString * const path = self.request.URL.path;
> NSString * const query = self.request.URL.query;
>
> if (!path || [path isEqualToString:@""]) {
> if (query) goto error;
> NSStringEncoding const encoding = NSUTF8StringEncoding;
> NSData * const aboutData =
> [@"<html><head><title>about</title></head><body>about:</body></html>"
> dataUsingEncoding:encoding];
>
> [self.client URLProtocol:self didReceiveResponse:[[NSURLResponse
> alloc] initWithURL:self.request.URL MIMEType:@"text/html"
> expectedContentLength:aboutData.length
> textEncodingName:nil/*(__bridge_transfer NSString
> *)CFStringConvertEncodingToIANACharSetName(CFStringConvertNSStringEncodingToEncoding(encoding))*/]
> cacheStoragePolicy:NSURLCacheStorageNotAllowed];
> [self.client URLProtocol:self didLoadData:aboutData];
> [self.client URLProtocolDidFinishLoading:self];
> } else {
> NSString * const handler = AboutKeyToSelectorMap()[path];
>
> if (handler) {
> self.processing = [NSThread currentThread];
> self.cancelled = NO;
> [self performSelector:NSSelectorFromString(handler)
> withObject:query afterDelay:0.0 inModes:@[[NSRunLoop
> currentRunLoop].currentMode, NSDefaultRunLoopMode]];
> } else {
> goto error;
> }
> }
> return;
>
> error:
> // Bad response.
> [self.client URLProtocol:self didFailWithError:[NSError
> errorWithDomain:NSURLErrorDomain code:NSURLErrorResourceUnavailable
> userInfo:nil]];
> }
I thought using “nil” instead of the big expression calculating the encoding
string would make a difference. It didn’t.
—
Daryle Walker
Mac, Internet, and Video Game Junkie
darylew AT mac DOT com
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