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내 응용 프로그램이 NSURLConnection을 사용하여 인터넷에서 파일을 다운로드하고 있습니다.NSURLConnection을 사용하여 다운로드하면 빈 데이터가 반환됩니까?
두 가지 문제가 발생됩니다
이1) 연결 didReceiveData]가 호출되지
[연결 didFinishDownloading이]라고2), 내 self.currentData 내가 뭘
비어 잘못된?
내 헤더는 다음과 같습니다
@interface DIFileDownloader : NSObject <NSURLConnectionDelegate> {
NSMutableData *currentData;
}
@property (nonatomic, assign) id <DIFileDownloaderDelegate> delegate;
@property (nonatomic, retain) NSMutableArray *supportedFormats;
@property (nonatomic, retain) NSMutableData *currentData;
@property (nonatomic, retain) NSURLConnection *downloadAgent;
@property (nonatomic) long long expectedContentSize;
@property (nonatomic) float currentDownloadProgress;
@property (nonatomic, getter = isRunning) BOOL running;
-(instancetype)initWithSupportedFormats:(NSArray *)extensions;
-(void)downloadFileAtURL:(NSURL *)url;
-(NSString *)documentsDirectoryPath;
@end
그리고 내 구현 파일 :
, 당신이 필요 코드에서 몇 가지 버그가 다른 사람과 내 댓글에서 언급 한 바와 같이-(instancetype)initWithSupportedFormats:(NSArray *)extensions {
self.supportedFormats = [[NSMutableArray alloc] initWithArray:extensions];
self.running = NO;
}
-(void)downloadFileAtURL:(NSURL *)url {
NSString *fileExtension = [url pathExtension];
if ([self.supportedFormats containsObject:fileExtension]) {
self.downloadAgent = [[NSURLConnection alloc] initWithRequest:[NSURLRequest requestWithURL:url] delegate:self];
[self.downloadAgent start];
NSLog(@"Beginning download at URL:%@", url.absoluteString);
}
else {
}
}
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
NSLog(@"Connection recieved response with size: %f", (float)[response expectedContentLength]);
self.expectedContentSize = (float)[response expectedContentLength];
self.running = YES;
NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse*)response;
NSLog(@"%i", [httpResponse statusCode]);
/*
if ([httpResponse statusCode] >= 200 && [httpResponse statusCode] <= 299) {
}
*/
}
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
NSLog(@"%f", (float)[data length]);
[currentData appendData:data];
self.currentDownloadProgress = ((float)[data length]/self.currentDownloadProgress);
NSLog(@"Connection recieved data. New progress is: %f", self.currentDownloadProgress);
if ([self.delegate respondsToSelector:@selector(downloader:progressChanged:)]) {
[self.delegate downloader:self progressChanged:self.currentDownloadProgress];
}
}
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
NSLog(@"Connection failed");
if ([self.delegate respondsToSelector:@selector(downloader:failedToDownloadFileAtURL:reason:)]) {
[self.delegate downloader:self failedToDownloadFileAtURL:connection.originalRequest.URL reason:error];
}
}
-(void)connectionDidFinishDownloading:(NSURLConnection *)connection destinationURL:(NSURL *)destinationURL {
NSLog(@"Connection finished downloading with size: %f", (float)[currentData length]);
self.running = NO;
NSString *filename = [destinationURL.absoluteString lastPathComponent];
NSString *docPath = [self documentsDirectoryPath];
NSString *pathToDownloadTo = [NSString stringWithFormat:@"%@/%@", docPath, filename];
NSError *error = nil;
[currentData writeToFile:pathToDownloadTo options:NSDataWritingAtomic error:&error];
if (error != nil) {
NSLog(@"DIFileDownloader: Failed to save the file because: %@", [error description]);
if ([self.delegate respondsToSelector:@selector(downloader:failedToDownloadFileAtURL:reason:)]) {
[self.delegate downloader:self failedToDownloadFileAtURL:connection.originalRequest.URL reason:error];
}
}
else {
if ([self.delegate respondsToSelector:@selector(downloader:finishedDownloadingFileNamed:atPath:)]) {
[self.delegate downloader:self finishedDownloadingFileNamed:filename atPath:pathToDownloadTo];
}
}
}
- (NSString *)documentsDirectoryPath {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectoryPath = [paths objectAtIndex:0];
return documentsDirectoryPath;
}
@end
글쎄, 당신은 결코 당신의 NSMutableData' 객체를 생성하지 않습니다. –
그리고 나서 [NSURLConnection connection : didReceiveData : is not called ios5]와 같은 문제가있는 것 같습니다 (http://stackoverflow.com/questions/13085007/nsurlconnection-connectiondidreceivedata-is-not-called-on-ios5) 또 다른 유용한 답변은 [NSURLConnection didReceiveData : did not got iOS] (http://stackoverflow.com/q/14553538) –
코드에 여러 가지 버그가 있습니다. init 메소드가 규칙에 맞지 않습니다. 객체를 반환하지 않습니다. 'currentDownloadProgress'를 계산하는 방법은 작동하지 않습니다. 코드에 어설 션 및 오류 검사를 많이 추가하고 디버깅 세션을 시작하는 것이 좋습니다. – CouchDeveloper