oss c sdk列出bucket下面的object提示SignatureDoesNotMatch

      各位大神，我写了段代码列出某个bucket下面的所有object提示SignatureDoesNotMatch，参照的是 http://helpcdn.aliyun.com/document_detail/oss/sdk/c-sdk/get-started.html写的。代码我贴出来，大家看看有没有什么不对的：



int main(int argc, char **argv)
{
    if (aos_http_io_initialize("oss_test", 0) != AOSE_OK)
    {
        exit(1);
    }


    aos_pool_t *p;
    int is_oss_domain = 0;
    oss_request_options_t *oss_request_options;
    aos_pool_create(&p, NULL);


    //init_oss_request_options
    oss_request_options = oss_request_options_create(p);
    oss_request_options->config = oss_config_create(oss_request_options->pool);
    aos_str_set(&oss_request_options->config->host, "oss-cn-hangzhou.aliyuncs.com");
    oss_request_options->config->port = 80;
    aos_str_set(&oss_request_options->config->id, "abcdef");
    aos_str_set(&oss_request_options->config->key, "XXXXXXXX");
    oss_request_options->config->is_oss_domain = is_oss_domain;
    oss_request_options->ctl = aos_http_controller_create(oss_request_options->pool, 0);


    aos_status_t *s;
    aos_table_t *resp_headers;
    aos_string_t bucket;
    char *bucket_name = "/mydomain/a/b/c/d/e/";
    oss_list_object_params_t *params;


    aos_str_set(&bucket, bucket_name);
    resp_headers = aos_table_make(p, 0);
    s = aos_status_create(p);


    params = oss_create_list_object_params(p);
    params->max_ret = 20;


    s = oss_list_object(oss_request_options, &bucket, params, &resp_headers);
    aos_pool_destroy(p);


    aos_http_io_deinitialize();


    return 0;
}


       调用oss_list_object函数后调试信息如下：
       s = 0x02720ee0 {code=403 error_code=0x027214e0 "SignatureDoesNotMatch" error_msg=0x027214f8 "The request signature we calculated does not match the signature you provided. Check your key and signing method." ...}


       实际上，如果我在浏览器中输入以下地址，访问某个object时，是可以的。就像下面这样：
       http://mydomain.oss-cn-hangzhou.aliyuncs.com/a/b/c/d/e/f.txt?OSSAccessKeyId=abcdef&Expires=1448637894&Signature=1234509876%5f7DEAop
       这样浏览器就可以直接显示该文件的内容。
       示例代码里面也没看到要提供Signature，而且我是访问bucket，列出里面的object。求大神帮忙解答，谢谢。