将照片从iPhone上传到网络服务器

我尝试使用许多不同的上传脚本将照片从我的iPhone应用程序上传到我的网络服务器.php但到目前为止我没有成功！

请检查我的iPhone源代码：

- (IBAction)upload:(id)sender {
    NSData *imageData = UIImageJPEGRepresentation(imageView.image, 90);
    NSString *urlString = @"http://wasnaga.nestons.org/420/upload.php";
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setURL:[NSURL URLWithString:urlString]];
    [request setHTTPMethod:@"POST"];
    NSString *boundary = [NSString stringWithString:@"------------------------1473780983146499882746641449"];
    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 stringWithFormat:@"Content-Disposition: form-data; name='"userfile'"; filename='.jpg'"'r'n"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"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];
    NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
    NSString *returnString =[[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];
    NSLog(returnString);   
}

有什么错误吗？你能帮我处理.php文件吗？