如何使用 NSFileHandle 和 NSURLConnection 将 wav 文件从网络下载到 iPhone 上的某个位置？
我想从网络服务下载 wav 文件，将其缓存在 iPhone 上并使用 AVAudioPlayer 播放它。在处理相对较大的文件时，使用 NSFileHandle 和 NSURLConnection 似乎是一个可行的解决方案。但是，在模拟器中运行应用程序后，我在定义的目录（NSHomeDirectory/tmp）下看不到任何保存的文件。下面是我的基本代码。我哪里做错了？任何想法表示赞赏！
#define TEMP_FOLDER [NSHomeDirectory() stringByAppendingPathComponent:@"tmp"]
- (void)downloadToFile:(NSString*)name
{
NSString* filePath = [[NSString stringWithFormat:@"%@/%@.wav", TEMP_FOLDER, name] retain];
self.localFilePath = filePath;
// set up FileHandle
self.audioFile = [[NSFileHandle fileHandleForWritingAtPath:localFilePath] retain];
[filePath release];
// Open the connection
NSURLRequest* request = [NSURLRequest
requestWithURL:self.webURL
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:60.0];
NSURLConnection* connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
}
#pragma mark -
#pragma mark NSURLConnection methods
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData*)data
{
[self.audioFile writeData:data];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError*)error
{
NSLog(@"Connection failed to downloading sound: %@", [error description]);
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
[connection release];
[audioFile closeFile];
}
I want to download a wav file from a web service, cache it on the iphone and playback it using AVAudioPlayer. Using NSFileHandle and NSURLConnection seems a viable solution when dealing with relatively large files. However, after running the app in the simulator I don't see any saved file under the defined directory (NSHomeDirectory/tmp). Below is my basic code. Where am I doing wrong? Any thoughts are appreciated!
#define TEMP_FOLDER [NSHomeDirectory() stringByAppendingPathComponent:@"tmp"]
- (void)downloadToFile:(NSString*)name
{
NSString* filePath = [[NSString stringWithFormat:@"%@/%@.wav", TEMP_FOLDER, name] retain];
self.localFilePath = filePath;
// set up FileHandle
self.audioFile = [[NSFileHandle fileHandleForWritingAtPath:localFilePath] retain];
[filePath release];
// Open the connection
NSURLRequest* request = [NSURLRequest
requestWithURL:self.webURL
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:60.0];
NSURLConnection* connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
}
#pragma mark -
#pragma mark NSURLConnection methods
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData*)data
{
[self.audioFile writeData:data];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError*)error
{
NSLog(@"Connection failed to downloading sound: %@", [error description]);
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
[connection release];
[audioFile closeFile];
}
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（2）
NSFileHandle fileHandleForWritingAtPath:要求文件已存在。您如何创建该文件？NSFileHandle fileHandleForWritingAtPath:requires the file to already exist. How are you creating the file?在哪里
你的代表
？这是您应该写入/保存文件的位置。
这是您附加收到的数据的位置。
Where is your
delegate?
this is where you should write/save the file.
this is where you append the data you receive.