ios http post a file

使用NSMutableURLRequest以及NSURLConnection：
-(void) uploadBinary:(NSData * ) binary withURL:(NSString * ) urlAddress withAttName:(NSString *) attname andFilename:(NSString *) filename{
    
    NSURL *theURL = [NSURL URLWithString:urlAddress];
    NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:theURL 
                                                              cachePolicy:NSURLRequestReloadIgnoringCacheData 
                                                          timeoutInterval:20.0f];
    [theRequest setHTTPMethod:@"POST"];
    NSString *boundary = [[NSProcessInfo processInfo] globallyUniqueString];
    NSString *boundaryString = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary];
    [theRequest addValue:boundaryString forHTTPHeaderField:@"Content-Type"];
    
    // define boundary separator...
    NSString *boundarySeparator = [NSString stringWithFormat:@"--%@\r\n", boundary];
    
    //adding the body...
    NSMutableData *postBody = [NSMutableData data];

    [postBody appendData:[boundarySeparator dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"%@\"\r\n",attname, filename] dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[@"Content-Type: application/octet-stream\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:binary];
    
    [postBody appendData:[[NSString stringWithFormat:@"\r\n--%@--\r \n",boundary]
                          dataUsingEncoding:NSUTF8StringEncoding]];
    [theRequest setHTTPBody:postBody];    
    
    
    [[[NSURLConnection alloc] initWithRequest:theRequest delegate:self] autorelease];
} 

另一種簡單的方式可以使用ASIFormDataRequest from ASIHTTPRequest lib：

ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];

[request setRequestMethod:@"POST"];

            

[request setFile:dataDir forKey:nil];

[request setDelegate:self];

[request startAsynchronous];

＝＝＝＝＝＝＝＝＝

- (void) requestFinished:(ASIHTTPRequest *)request {

    //NSString *responseString = [request responseString];

    NSLog(@"Response %d : %@", request.responseStatusCode, [request responseString]);

    

    //NSData *responseData = [request responseData];

}

- (void) requestStarted:(ASIHTTPRequest *) request {

    NSLog(@"request started...");

}

- (void) requestFailed:(ASIHTTPRequest *) request {

    NSError *error = [request error];

    NSLog(@"%@", error);

}