WebView的自定义NSURLProtocol类在加载HTML5文档中的视频时不起作用 [英] Custom NSURLProtocol class for WebView doesn't work when loading video in HTML5 document
问题描述
我正在使用WebView加载其内容从某个位置像沙箱。所以我添加了NSURLProtocol的简单子类来处理这些文件。协议处理程序将管理URL方案像dummy:。当我尝试自定义url像dummy:///index.html,这应该从本地目录加载index.html。 Htmls和嵌入的图像等工作正常。
I'm working with WebView which loads its contents from certain location like sandbox. So I added simple child class of NSURLProtocol to handle those files. The protocol handler will manage URL scheme like "dummy:". When I tried custom url like dummy:///index.html, this should load index.html from a local directory. Htmls and embedded images etc. worked fine.
但是当我尝试html文件包括HTML5视频播放器使用标签,它不工作。 WebView甚至没有尝试方法canInitWithRequest:请求在我的自定义类的视频文件。
But when I tried an html file includes HTML5 video player using tag, it doesn't work. WebView even didn't tried the method canInitWithRequest:request in my custom class for the video file.
@interface DummyURLProtocol : NSURLProtocol {
}
+ (BOOL)canInitWithRequest:(NSURLRequest *)request;
+ (NSURLRequest *)canonicalRequestForRequest:(NSURLRequest *)request;
+ (BOOL)requestIsCacheEquivalent:(NSURLRequest *)a toRequest:(NSURLRequest *)b;
- (void)startLoading;
- (void)stopLoading;
@end
@implementation DummyURLProtocol
+(BOOL)canInitWithRequest:(NSURLRequest *)request {
return [[[request URL] scheme] isEqualToString:@"dummy"];
}
+(NSURLRequest *)canonicalRequestForRequest:(NSURLRequest *)request {
return request;
}
+(BOOL)requestIsCacheEquivalent:(NSURLRequest *)a toRequest:(NSURLRequest *)b {
return [[[a URL] resourceSpecifier] isEqualToString:[[b URL] resourceSpecifier]];
}
-(void)startLoading {
NSURL *url = [[self request] URL];
NSString *pathString = [url resourceSpecifier];
NSString *path = [NSString stringWithFormat:@"/Users/cronos/tmp/video_demo/%@", pathString];
NSString *fullFilename = [pathString lastPathComponent];
NSString *extention = [fullFilename pathExtension];
NSString *mimeType = [[SSGHTMLUtil sharedUtil] mimeTypeForExtension:extention];
NSLog(@"DummyURLProtocol:FILEPATH: %@ EXTENSION: %@ MIME-TYPE: %@", path, extention, mimeType);
NSURLResponse *response = [[NSURLResponse alloc] initWithURL:url MIMEType:mimeType expectedContentLength:-1 textEncodingName:nil];
FILE *fp = fopen([path UTF8String], "r");
if (fp) {
char buf[32768];
size_t len;
[[self client] URLProtocol:self
didReceiveResponse:response
cacheStoragePolicy:NSURLCacheStorageNotAllowed];
while ((len = fread(buf,1,sizeof(buf),fp))) {
[[self client] URLProtocol:self didLoadData:[NSData dataWithBytes:buf length:len]];
}
fclose(fp);
}
[[self client] URLProtocolDidFinishLoading:self];
}
-(void)stopLoading {
}
@end
我在applicationDidFinishLaunching中注册了协议处理程序:在AppDelegate.m
I registered the protocol handler in applicationDidFinishLaunching: in AppDelegate.m
if ([NSURLProtocol registerClass:[DummyURLProtocol class]]) {
NSLog(@"URLProtocol registration successful.");
} else {
NSLog(@"URLProtocol registration failed.");
}
然后我试过我的WebView与urldummy:/// HTML5_Video。 html。其他资源,如JavaScript文件,CSS文件,图像成功加载,但mp4文件没有传递到DummyURLProtocol。 HTML5_Video.html包括以下内容。
then I tried my WebView with the url "dummy:///HTML5_Video.html". Other resources like javascript files, css files, images are loaded successfully but mp4 file wasn't passed to the DummyURLProtocol. The HTML5_Video.html includes following.
<video preload="metadata"> <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=676422 -->
<source src="assets/dizzy.mp4" type="video/mp4" />
<source src="assets/dizzy.webm" type="video/webm" />
<source src="assets/dizzy.ogv" type="video/ogv" />
</video>
有任何想法或良好的出发点来解决这个问题吗?
Any ideas or good starting point to solve this problem?
谢谢。
推荐答案
Yup。
我在一年前与Apple提交了错误。
I've filed bugs with Apple over a year ago.
视频和其他多媒体类型(包括SVG)不会通过NSURL协议机制
Video and other multimedia types including SVG do not go through the NSURLProtocol mechanism
请参阅 http:// openradar.appspot.com/8446587
和 http:// openradar .appspot.com / 8692954
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