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<h2>/SpecialProtocol.m</h2>
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<p><strong><a href="SpecialPictureProtocol.zip">Download Sample</a></strong> (“SpecialPictureProtocol.zip”, 76.8K)<BR>
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<pre class="sourcecodebox">/*
File: SpecialProtocol.m
Abstract: implementation for our custom NSURLProtocol
Version: 1.0
© Copyright 2006 Apple Computer, Inc. All rights reserved.
IMPORTANT: This Apple software is supplied to
you by Apple Computer, Inc. ("Apple") in
consideration of your agreement to the following
terms, and your use, installation, modification
or redistribution of this Apple software
constitutes acceptance of these terms. If you do
not agree with these terms, please do not use,
install, modify or redistribute this Apple
software.
In consideration of your agreement to abide by
the following terms, and subject to these terms,
Apple grants you a personal, non-exclusive
license, under Apple's copyrights in this
original Apple software (the "Apple Software"),
to use, reproduce, modify and redistribute the
Apple Software, with or without modifications, in
source and/or binary forms; provided that if you
redistribute the Apple Software in its entirety
and without modifications, you must retain this
notice and the following text and disclaimers in
all such redistributions of the Apple Software.
Neither the name, trademarks, service marks or
logos of Apple Computer, Inc. may be used to
endorse or promote products derived from the
Apple Software without specific prior written
permission from Apple. Except as expressly
stated in this notice, no other rights or
licenses, express or implied, are granted by
Apple herein, including but not limited to any
patent rights that may be infringed by your
derivative works or by other works in which the
Apple Software may be incorporated.
The Apple Software is provided by Apple on an "AS
IS" basis. APPLE MAKES NO WARRANTIES, EXPRESS OR
IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE, REGARDING
THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE
OR IN COMBINATION WITH YOUR PRODUCTS.
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY
SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE,
REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION OF
THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER
UNDER THEORY OF CONTRACT, TORT (INCLUDING
NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN
IF APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
*/
#import <Foundation/NSError.h>
#import "SpecialMacros.h"
#import "SpecialProtocol.h"
#import "MyController.h"
/* NSImage -> jfif utility category. */
@implementation NSImage (JFIFConversionUtils)
/* returns jpeg file interchange format encoded data for an NSImage regardless of the
original NSImage encoding format. compressionValue is between 0 and 1.
values 0.6 thru 0.7 are fine for most purposes. */
- (NSData *)JFIFData:(float) compressionValue {
MLOG(@"%@ received %@", self, NSStringFromSelector(_cmd));
/* convert the NSImage into a raster representation. */
NSBitmapImageRep* myBitmapImageRep = [NSBitmapImageRep imageRepWithData: [self TIFFRepresentation]];
/* convert the bitmap raster representation into a jfif data stream */
NSDictionary* propertyDict =
[NSDictionary dictionaryWithObject:[NSNumber numberWithFloat:compressionValue]
forKey: NSImageCompressionFactor];
/* return the jfif encoded data */
return [myBitmapImageRep representationUsingType: NSJPEGFileType properties:propertyDict];
}
@end
/* data passing categories on NSURLRequest and NSMutableURLRequest. see the
header file for more info. */
@implementation NSURLRequest (SpecialProtocol)
- (NSDictionary *)specialVars {
MLOG(@"%@ received %@", self, NSStringFromSelector(_cmd));
return [NSURLProtocol propertyForKey:[SpecialProtocol specialProtocolVarsKey] inRequest:self];
}
@end
@implementation NSMutableURLRequest (SpecialProtocol)
- (void)setSpecialVars:(NSDictionary *)specialVars {
MLOG(@"%@ received %@", self, NSStringFromSelector(_cmd));
NSDictionary *specialVarsCopy = [specialVars copy];
[NSURLProtocol setProperty:specialVarsCopy
forKey:[SpecialProtocol specialProtocolVarsKey] inRequest:self];
[specialVarsCopy release];
}
@end
@implementation SpecialProtocol
/* our own class method. Here we return the NSString used to mark
urls handled by our special protocol. */
+ (NSString*) specialProtocolScheme {
return @"special";
}
/* our own class method. Here we return the NSString used to identify
the property we add to the NSURLRequest object for passing around data. */
+ (NSString*) specialProtocolVarsKey {
return @"specialVarsKey";
}
/* our own class method. We call this routine to handle registration
of our special protocol. You should call this routine BEFORE any urls
specifying your special protocol scheme are presented to webkit. */
+ (void) registerSpecialProtocol {
static BOOL inited = NO;
if ( ! inited ) {
[NSURLProtocol registerClass:[SpecialProtocol class]];
inited = YES;
}
}
/* class method for protocol called by webview to determine if this
protocol should be used to load the request. */
+ (BOOL)canInitWithRequest:(NSURLRequest *)theRequest {
MLOG(@"%@ received %@ with url='%@' and scheme='%@'",
self, NSStringFromSelector(_cmd),
[[theRequest URL] absoluteString], [[theRequest URL] scheme]);
/* get the scheme from the URL */
NSString *theScheme = [[theRequest URL] scheme];
/* return true if it matches the scheme we're using for our protocol. */
return ([theScheme caseInsensitiveCompare: [SpecialProtocol specialProtocolScheme]] == NSOrderedSame );
}
/* if canInitWithRequest returns true, then webKit will call your
canonicalRequestForRequest method so you have an opportunity to modify
the NSURLRequest before processing the request */
+(NSURLRequest *)canonicalRequestForRequest:(NSURLRequest *)request {
MLOG(@"%@ received %@", self, NSStringFromSelector(_cmd));
/* we don't do any special processing here, though we include this
method because all subclasses must implement this method. */
return request;
}
/* our main loading routine. This is where we do most of our processing
for our class. In this case, all we are doing is taking the path part
of the url and rendering it in 36 point system font as a jpeg file. The
interesting part is that we create the jpeg entirely in memory and return
it back for rendering in the webView. */
- (void)startLoading {
MLOG(@"%@ received %@ - start", self, NSStringFromSelector(_cmd));
/* retrieve the current request. */
NSURLRequest *request = [self request];
/* extract our special variables from the request. */
NSDictionary* specialVars = [request specialVars];
if (specialVars) {
/* extract a reference to our WebResourceLoadDelegate object. */
MyController* theCaller = (MyController*) [specialVars objectForKey:[MyController callerKey]];
if (theCaller) {
[theCaller callbackFromSpecialRequest: request];
}
}
/* Since the scheme is free to encode the url in any way it chooses, here
we are using the url text to identify files names in our resources folder
that we would like to display. */
/* get the path component from the url */
NSString* theString = [[[request URL] path] substringFromIndex:1];
/* set up some font attributes we'll use for rendering the path string to an NSImage */
NSDictionary* fontAttrs =
[NSDictionary dictionaryWithObjectsAndKeys:
[NSColor redColor], NSForegroundColorAttributeName,
[NSFont systemFontOfSize:36], NSFontAttributeName,
nil];
/* calculate the size of the rendered string */
NSSize tsz = [theString sizeWithAttributes:fontAttrs];
/* allocate an NSImage with large dimensions enough to draw the entire string. */
NSImage *myImage = [[[NSImage alloc] initWithSize: tsz] autorelease];
/* draw the string into the NSImage */
[myImage lockFocus];
[theString drawAtPoint:NSMakePoint(0,0) withAttributes:fontAttrs];
[myImage unlockFocus];
/* retrieve the jfif data for the image */
NSData *data = [myImage JFIFData: 0.75];
/* create the response record, set the mime type to jpeg */
NSURLResponse *response =
[[NSURLResponse alloc] initWithURL:[request URL]
MIMEType:@"image/jpeg"
expectedContentLength:-1
textEncodingName:nil];
/* get a reference to the client so we can hand off the data */
id<NSURLProtocolClient> client = [self client];
/* turn off caching for this response data */
[client URLProtocol:self didReceiveResponse:response
cacheStoragePolicy:NSURLCacheStorageNotAllowed];
/* set the data in the response to our jfif data */
[client URLProtocol:self didLoadData:data];
/* notify that we completed loading */
[client URLProtocolDidFinishLoading:self];
/* we can release our copy */
[response release];
/* if an error occured during our load, here is the code we would
execute to send that information back to webKit. We're not using it here,
but you will probably want to use this code for proper error handling. */
if (0) { /* in case of error */
int resultCode;
resultCode = NSURLErrorResourceUnavailable;
[client URLProtocol:self didFailWithError:[NSError errorWithDomain:NSURLErrorDomain
code:resultCode userInfo:nil]];
}
/* added the extra log statement here so you can see that stopLoading is called
by the underlying machinery before we leave this routine. */
MLOG(@"%@ received %@ - end", self, NSStringFromSelector(_cmd));
}
/* called to stop loading or to abort loading. We don't do anything special
here. */
- (void)stopLoading
{
MLOG(@"%@ received %@", self, NSStringFromSelector(_cmd));
}
@end
</pre>
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