objective-c – 使用http POST上传多个文件

我正在向我的webservice发送一个带有所有必要参数的HTTP POST请求.我发送两个文件,一个是图像,第二个是音频.图像正在上传,但音频不上传.
当我跟踪我的Web服务时,它只显示图像字段作为上传文件.它没有表明音频也存在.

我的代码是：

NSString *urlString = [NSString stringWithFormat:ADD_LEAD_API_URL];

NSMutableURLRequest *postRequest =  [NSMutableURLRequest requestWithURL:[NSURL URLWithString:urlString]];



// change type to POST (default is GET)
[postRequest setHTTPMethod:@"POST"];


// just some random text that will never occur in the body
NSString *stringBoundary = @"0xKhTmLbOuNdArY---This_Is_ThE_BoUnDaRyy---pqo";

// header value
NSString *headerBoundary = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",stringBoundary];

// set header
[postRequest addValue:headerBoundary forHTTPHeaderField:@"Content-Type"];

// create data
NSMutableData *postBody = [NSMutableData data];



[postBody appendData:[[NSString stringWithFormat:@"--%@rn",stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
[postBody appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name="userId"rnrn"] dataUsingEncoding:NSUTF8StringEncoding]];
[postBody appendData:[appDelegate.objCurrentUser.userId dataUsingEncoding:NSUTF8StringEncoding]];
[postBody appendData:[@"rn" dataUsingEncoding:NSUTF8StringEncoding]];     


// message part
[postBody appendData:[[NSString stringWithFormat:@"--%@rn",stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
[postBody appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name="firstName"rnrn"] dataUsingEncoding:NSUTF8StringEncoding]];
[postBody appendData:[firstName dataUsingEncoding:NSUTF8StringEncoding]];
[postBody appendData:[@"rn" dataUsingEncoding:NSUTF8StringEncoding]];

/*** My rest of string parameters are successfully added to request ***/


// media part
[postBody appendData:[[NSString stringWithFormat:@"--%@rn",stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
[postBody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name="imageUrl"; filename="dummy.jpg"rn"] dataUsingEncoding:NSUTF8StringEncoding]];
[postBody appendData:[@"Content-Type: image/jpegrn" dataUsingEncoding:NSUTF8StringEncoding]];
[postBody appendData:[@"Content-Transfer-Encoding: binaryrnrn" dataUsingEncoding:NSUTF8StringEncoding]];
    // get the image data from main bundle directly into NSData object

UIImage *img= leadImage;
NSData *imageData= UIImageJPEGRepresentation(img,90);

[postBody appendData:imageData];

// Image is being uploaded

[postBody appendData:[[NSString stringWithFormat:@"--%@rn",stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
[postBody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name="recordSoundUrl"; filename="%@"rn",self.recordingPath] dataUsingEncoding:NSUTF8StringEncoding]];
[postBody appendData:[@"Content-Type: application/octet-streamrn" dataUsingEncoding:NSUTF8StringEncoding]];
[postBody appendData:[@"Content-Transfer-Encoding: binaryrnrn" dataUsingEncoding:NSUTF8StringEncoding]];


NSData *soundData = [NSData dataWithContentsOfFile:[appDelegate.documentDir stringByAppendingPathComponent:self.recordingPath]];
[postBody appendData:soundData];
[postBody appendData:[@"rn" dataUsingEncoding:NSUTF8StringEncoding]];

// final boundary
[postBody appendData:[[NSString stringWithFormat:@"--%@rn",stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];

// add body to post
[postRequest setHTTPBody:postBody];

// Asynch request
NSURLConnection *conn = [NSURLConnection connectionWithRequest:postRequest delegate:self];

如果我不上传图像,则需要音频.所以我只能发送一个带有请求的文件.
请帮帮我,告诉我在任何地方我都错了.

提前致谢.