iphone 向 Web 服务器发送图片

     C 代码
   //把图片转换为 NSData
        UIImage *image = [UIImage imageNamed:@"vim_go.png"];        
        NSData *imageData = UIImagePNGRepresentation(image);
        // post url
        NSString *urlString = @"http://10.28.4.162/test-upload.php";
        
        // setting up the request object now
        NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
        [request setURL:[NSURL URLWithString:urlString]];
        [request setHTTPMethod:@"POST"];
        //
               NSString  *boundary  =  [NSString  stringWithString:@"---------------------------
14737809831466499882746641449"];
          NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=
%@",boundary];
        [request addValue:contentType forHTTPHeaderField: @"Content-Type"];
        //
        NSMutableData *body = [NSMutableData data];
               [body  appendData:[[NSString  stringWithFormat:@"\r\n--%@\r\n",boundary] 
dataUsingEncoding:NSUTF8StringEncoding]];        
               [body  appendData:[[NSString  stringWithString:@"Content-Disposition:  form-data; 
name=\"userfile\"; filename=\"vim_go.png\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
               [body  appendData:[[NSString  stringWithString:@"Content-Type:  application/octet-
stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[NSData dataWithData:imageData]];
               [body  appendData:[[NSString  stringWithFormat:@"\r\n--%@--\r\n",boundary] 
dataUsingEncoding:NSUTF8StringEncoding]];
        [request setHTTPBody:body];
        
        NSLog(@"%@",body);
        NSLog(@"%@",request);
     C 代码
               NSData  *returnData  =  [NSURLConnection  sendSynchronousRequest:request 
returningResponse:nil error:nil];
     C 代码
NSString 

*returnString 

= 

[[NSString 

alloc] 

initWithData:returnData 

encoding:NSUTF8StringEncoding];