UIwebview 文件的下载与保存,以及mp3文件的播放
- 这里只是说说异步 单线程下载与文件的保存
- 以下载一个mp3文件并保存为例:
- -(void)loading
- {
- //设置文件下载地址
- NSString *urlString = [NSString stringWithFormat:@"http://zhangmenshiting2.baidu.com/data2/music/14893666/14893666.mp3?xcode=f7e142418de081ff52f81344843b869a&mid=0.73830637514858"];//这里设置的是一个mp3的下载地址
- NSString * encodedString = (NSString *)CFURLCreateStringByAddingPercentEscapes( kCFAllocatorDefault, (CFStringRef)urlString, NULL, NULL, kCFStringEncodingUTF8 );
- NSURL *url =[NSURL URLWithString:encodedString];
- //创建NSURLRequest和NSURLConnection,并立即启动连接
- NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData timeoutInterval:5.0f];
- NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:YES];
- if (connection)
- {
- self.receivedData = [NSMutableData data];//初始化接收数据的缓存
- }
- else
- {
- NSLog(@"Bad Connection!");
- }
- [request release];
- [connection release];
- }
- - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
- {
- [receivedData setLength:0];//置空数据
- long long mp3Size = [response expectedContentLength];//获取要下载的文件的长度
- NSLog(@"%lld",mp3Size);
- }
- //接收NSMutableData数据
- - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
- {
- [receivedData appendData:data];
- }
- //接收完毕
- - (void)connectionDidFinishLoading:(NSURLConnection *)connection
- {
- [connection cancel];
- //在保存文件和播放文件之前可以做一些判断,保证程序的健壮行:例如:文件是否存在,接收的数据是否完整等处理,此处没加,使用时注意
- NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
- NSString *documentsDirectory = [paths objectAtIndex:0];
- NSLog(@"mp3 path=%@",documentsDirectory);
- NSString *filePath = [documentsDirectory stringByAppendingPathComponent: mp3Name];//mp3Name:你要保存的文件名称,包括文件类型。如果你知道文件类型的话,可以指定文件类型;如果事先不知道文件类型,可以在- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response中获取要下载的文件类型
- //在document下创建文件
- NSFileManager *fileManager = [NSFileManager defaultManager];
- [fileManager createFileAtPath:filePath contents:nil attributes:nil];
- NSLog(@"mp3 path=%@",filePath);
- //将下载的数据,写入文件中
- [receivedData writeToFile:filePath atomically:YES];
- //播放下载下来的mp3文件
- [self playVoice:filePath];
- //如果下载的是图片则可以用下面的方法生成图片并显示 create image from data and set it to ImageView
- /*
- UIImage *image = [[UIImage alloc] initWithData:recvData];
- [imgView setImage:image];
- */
- }
- 简单的播放mp3文件的方法:
- 使用前要添加库:AudioToolbox.framework和AVFoundation.framework,
- //添加头文件
- #import <AVFoundation/AVFoundation.h>
- #import <AudioToolbox/AudioToolbox.h>
- -(void)playVoice:(NSString *)filePath
- {
- //播放文件的路径
- NSURL * musicURL= [[NSURL alloc] initFileURLWithPath:filePath];
- //创建音频 播放器
- AVAudioPlayer * voicePlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:musicURL error:nil];
- self.thePlayer = voicePlayer;
- [voicePlayer release];
- [musicURL release];
- [thePlayer setVolume:1]; //设置音量大小
- thePlayer.numberOfLoops = -1;//设置音乐播放次数 -1为一直循环
- //播放mp3,如果想要实现一些别的功能,可以看看AVAudioPlayer这个类,这里只是实现播放功能
- [thePlayer play];
- }
郑重声明:本站内容如果来自互联网及其他传播媒体,其版权均属原媒体及文章作者所有。转载目的在于传递更多信息及用于网络分享,并不代表本站赞同其观点和对其真实性负责,也不构成任何其他建议。