[LAD] send midi message

[Dave Stikkolorum]

On 06-01-12 11:21, Pedro Lopez-Cabanillas wrote:
> On Friday 06 January 2012, you wrote:
>> btw: is there a way to list available clients/ports from the api.
>> I know that aconnect -i / -o does this, but is there a c/c++ function?
>>
>> Dave
> The functions are: snd_seq_query_next_client() and snd_seq_query_next_port();
> you need to loop calling these functions while they return a correct answer.
> For instance, this is the relevant code in "aconnect.c" :
>
> static void do_search_port(snd_seq_t *seq, int perm, action_func_t do_action)
> {
>        snd_seq_client_info_t *cinfo;
>        snd_seq_port_info_t *pinfo;
>        int count;
>
>        snd_seq_client_info_alloca(&cinfo);
>        snd_seq_port_info_alloca(&pinfo);
>        snd_seq_client_info_set_client(cinfo, -1);
>        while (snd_seq_query_next_client(seq, cinfo)>= 0) {
>              /* reset query info */
>              snd_seq_port_info_set_client(pinfo,
> snd_seq_client_info_get_client(cinfo));
>              snd_seq_port_info_set_port(pinfo, -1);
>              count = 0;
>              while (snd_seq_query_next_port(seq, pinfo)>= 0) {
>                    if (check_permission(pinfo, perm)) {
>                          do_action(seq, cinfo, pinfo, count);
>                          count++;
>                    }
>              }
>        }
> }
>
> See:
> http://git.alsa-project.org/?p=alsa-utils.git;a=blob;f=seq/aconnect/aconnect.c
> I guess you already know the reference documentation site:
> http://www.alsa-project.org/alsa-doc/alsa-lib/seq.html
>
> Just for comparison, a similar enumeration using Drumstick looks like this:
>
>      QListIterator<PortInfo>  it(m_Client->getAvailableOutputs());
>      while(it.hasNext()) {
>          PortInfo p = it.next();
>          cout<<  p.getClientName()<<  ":"<<  p.getPort();
>      }
Thanks,

I was thinking that maybe it would be nicer to connect from my program 
to Hydrogen.
Then I don't have to restart Hydrogen everytime my program has ended.

> See Drumstick's example "drumgrid":
> http://drumstick.sourceforge.net/docs/drumgrid.cpp-example.html
>
> Regards,
> Pedro
Dave