这是我的代码upload an audio file。I tried lot of questions and answers in stackoverflow. 但我仍然没有得到任何改善。我必须上传一个带有php link. 如果我这样做，我already exists总是得到像“”这样的回应。我试图更改文件名并上传它。仍然得到相同的响应。实际上，我必须从服务器接收响应作为我上传的文件的链接。我对此一无所知php。任何人都可以帮我解决这个问题。任何帮助将不胜感激，以解决我的问题。
NSData *fileData=[NSData dataWithContentsOfURL:soundFileURL];
NSMutableURLRequest *request=[NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"https://somesite.com/upload.php"]];
[request setHTTPMethod:@"POST"];
NSString *boundary = [NSString stringWithString:@"---------------------------14737809831466499882746641449"];
NSMutableData *body = [[NSMutableData alloc]init];
[body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"userfile\"; filename=\"fvgv4r346r4r4h3ur543ty5u54y5u4574545g4g5.samr\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
//[soundFileURL lastPathComponent]
[body appendData:[[NSString stringWithString:@"Content-Type: music/samr\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:fileData];
[body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[request setHTTPBody:body];
NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
[request addValue:contentType forHTTPHeaderField: @"Content-Type"];
// NSLog(@"%@",[NSString stringWithUTF8String:[body bytes]]);
NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];
NSLog(@"%@",returnString);