NSURLConnection的似乎并不奏效，

Question

我试图使用googletts转换并似乎遇到了麻烦。我认为我在结构上做了正确的课。但我不认为NSURLConnection正在返回任何有用的数据。有人可以帮助我检查它的工作，如果不是为什么？

在connectiondidfinishloading部分我检查下载长度 的NSLog（@“hmmmm％录”，（无符号长）downloadedData长度]） 它返回0。这就是为什么我认为它不工作。

的目标是让应用程序说什么下载

谢谢！

我只是在我的视图控制器一个按钮，启动一切

#import <UIKit/UIKit.h> 
#import <CoreLocation/CoreLocation.h> 
#import "RJGoogleTTS.h" 


@interface ViewController : UIViewController <CLLocationManagerDelegate> 

@property (weak, nonatomic) IBOutlet UILabel *userLabel; 
@property (strong, nonatomic) CLLocationManager *locationManager; 
@property (strong, nonatomic) CLGeocoder *geoCoder; 

@property (strong, nonatomic) RJGoogleTTS *googleTTS; 

- (IBAction)geoCodeLocation:(id)sender; 

- (IBAction)rjGoogleButton:(id)sender; 
@end 

这里是实现文件

- (IBAction)rjGoogleButton:(id)sender { 

    googleTTS = [[RJGoogleTTS alloc]init]; 

    [googleTTS convertTextToSpeech:@"How are you today user?"]; 

} 

RJGoogleTTS.h

#import <Foundation/Foundation.h> 

@protocol RJGoogleTTSDelegate <NSObject> 

@required 
- (void)receivedAudio:(NSMutableData *)data; 
- (void)sentAudioRequest; 

@end 

@interface RJGoogleTTS : NSObject { 
    id <RJGoogleTTSDelegate> delegate; 
    NSMutableData *downloadedData; 
} 

@property (nonatomic, retain) id <RJGoogleTTSDelegate> delegate; 
@property (nonatomic, retain) NSMutableData *downloadedData; 

- (void)convertTextToSpeech:(NSString *)searchString; 

@end 

.M

#import "RJGoogleTTS.h" 
#import <AVFoundation/AVFoundation.h> 

@implementation RJGoogleTTS 
@synthesize delegate, downloadedData; 

- (id)init 
{ 
    self = [super init]; 
    if (self) { 
     // Initialization code here. 
    } 

    return self; 
} 

- (void)convertTextToSpeech:(NSString *)searchString { 
    NSString *search = [NSString stringWithFormat:@"http://translate.google.com/translate_tts?q=%@", searchString]; 
    search = [search stringByReplacingOccurrencesOfString:@" " withString:@"%20"]; 
    NSLog(@"Search: %@", search); 
    self.downloadedData = [[NSMutableData alloc] initWithLength:0]; 
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:search]]; 
    [request setValue:@"Mozilla/5.0" forHTTPHeaderField:@"User-Agent"]; 
    NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:YES]; 
    [delegate sentAudioRequest]; 




} 

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { 
    NSLog(@"did you receive response user"); 
    [self.downloadedData setLength:0]; 

} 

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { 
    NSLog(@"did you receive data user"); 
    [self.downloadedData appendData:data]; 

// AVAudioPlayer *audioPlayer = [[AVAudioPlayer alloc]initWithData:downloadedData error:nil]; 
// [audioPlayer play]; 

} 

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { 
    NSLog(@"Failure"); 
} 

- (void)connectionDidFinishLoading:(NSURLConnection *)connection { 

    NSLog(@"it worked user!!!"); 
    [delegate receivedAudio:self.downloadedData]; 
    NSLog(@"hmmmm %d", [self.downloadedData length]); 



// NSString *txt = [[NSString alloc] initWithData:downloadedData encoding: NSASCIIStringEncoding]; 
// NSLog(@"%@hello",txt); 

} 

@end 

Answer 1

没有什么不对您NSURLConnection的方法。您的搜索字符串是错误的。它应该是：

NSString *search = [NSString stringWithFormat:@"http://translate.google.com/translate_tts?tl=en&q=%@",searchString]; 

Answer 2

请记住，这是异步发生的。在您致电NSURLConnection后，您将downloadedData的尺寸设置为0。

移动：

self.downloadedData = [[NSMutableData alloc] initWithLength:0];

您的来电NSURLConnection之前。

Answer 3

你没有启动的URLConnection。更改[[NSURLConnection alloc] initWithRequest:request delegate:self];这样[[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:YES];