[libmicrohttpd] 回复:Re: Any MHD_ContentReaderCallback Example Code

[lingweicai]

Thanks Christian.

 

Can I create a MHD_response, by the crc callback to print a circleq ( a circle queue,generated with Macro functions /sys/queue.h ), my crc callback is like this :

 

ssize_t
crc (void *cls, uint64_t pos, char *buf, size_t max)
{
        struct circleq_user  * cq_user_ptr = cls; 

// if last entry, end the crc 
        if ( cq_user_ptr->entries.cqe_next == (void *) &head )

                return MHD_CONTENT_READER_END_OF_STREAM;

// pointer of next entry to assigned to cls 
        cls  = cq_user_ptr->entries.cqe_next ;

// generate buff content

        return snprintf (buf, 256,
                           "<a href="">                           cq_user_ptr->user_mem_list_ptr->u_base.u_name ,
                           cq_user_ptr->user_mem_list_ptr->u_base.u_name
                );
} 

 

when my circle-head pointer as the parameter of cls for crc, the above code always print the first entry of my circle queue. Can I assign the next pointer of
"cls  = cq_user_ptr->entries.cqe_next ; " 

to re-callback the crc ? it looks this does not work. how can I transfer the "next pointer" of my list as the parameter to the next call crc ?

Thanks,

Forrest Ling wei cai.

 

 

 

 

 

----- 原始邮件 -----

 

发件人：Christian Grothoff<address@hidden>

发送时间：2018-02-05 21:58:17

收件人：lingweicai<address@hidden>;libmicrohttpd<address@hidden>

主 题：Re: Any MHD_ContentReaderCallback Example Code

On 02/04/2018 03:19 AM, lingweicai wrote:
> Dear all:
>
> I want to create responses with strings variables, for example , html
> start tag, html title, css, js, head1, content, html end tag , etc.
>
> Can I use this callback function instead of
> MHD_create_response_from_buffer?

In principle you can use MHD_create_response_from_callback() always
instead of _from_buffer, as _from_callback is more general. Whether it
makes sense in your case I cannot judge.

> I have not found any example codes on the callback.

Look here: src/examples/fileserver_example_dirs.c