ReadMe.txt
### SpecialPictureProtocol ### |
ABOUT: |
This sample includes a custom NSURLProtocol that creates jpeg images on the fly in memory |
so they can be displayed in a webView. In addition sample demonstrates how to render an |
NSString into an NSImage and then convert the resulting NSImage into jpeg format. Also |
this sample illustrates the recommended technique for sharing information between your |
webView's WebResourceLoadDelegate object and your custom NSURLProtocol object. |
We subclass the abstract class NSURLProtocol which provides the basic |
structure for performing protocol-specific loading of URL data. Our concrete subclass |
will add support for the 'special':// URL scheme. We override the following methods: |
+ (BOOL)canInitWithRequest:(NSURLRequest *)theRequest |
This method must be overridden by all subclasses of NSURLProtocol and is called to |
determine if a subclass can be used to load the requested URL. |
+(NSURLRequest *)canonicalRequestForRequest:(NSURLRequest *)request |
This method gives a subclass the opportunity to modify an NSURLRequest before it |
is asked to load it. Subclasses are required to provide an implementation. In |
our sample this method is overridden only as a formality and we simply return the |
argument. |
- (void)startLoading |
This is where we do most of our processing for our class. We take the |
requested string and render it into an image that we return as our response. |
- (void)stopLoading |
Called when the load needs to abort. We don't do anything special here. |
=========================================================================== |
BUILD REQUIREMENTS: |
Xcode 3.2, Mac OS X 10.6 Snow Leopard or later |
=========================================================================== |
RUNTIME REQUIREMENTS: |
Mac OS X 10.6 Snow Leopard or later |
=========================================================================== |
CHANGES FROM PREVIOUS VERSIONS: |
Version 1.1 |
- Added a ReadMe |
- Updated html file loading routine. |
- Project updated for Xcode 4. |
Version 1.0 |
- First release |
=========================================================================== |
Copyright (C) 2006-2011, Apple Inc. |
Copyright © 2011 Apple Inc. All Rights Reserved. Terms of Use | Privacy Policy | Updated: 2011-07-11