Problem to use PtAppAddInput

QNX Newsgroups (Archives) qdn.public.qnxrtp.photon
1

I had created a Photon program without PhAB and add a extra message handler
with PtAppAddInput , my question is how to send message to the Photon from
other process . I don’t know how to do it because I do not know the channel
Id of the Photon…

2

waity <waity@hongkong.com> wrote:

I had created a Photon program without PhAB and add a extra message handler
with PtAppAddInput , my question is how to send message to the Photon from
other process . I don’t know how to do it because I do not know the channel
Id of the Photon…

Attach a name using name_attach(), and then let the photon
library know that you want it to watch the resulting channel via
PhChannelAttach().


Here’s a snippet of code for the program that does the name
attach:

************* begins *************************
/*-----------------------------------------------------------
*

  • init - Application initialization function.

---------------------------------------------------------/
int
init( int argc, char argv[] )
{
/

  • attach a name so that other processes can find us
    /
    if( (attach = name_attach( NULL, “GUIapp”, 0 ))
    == NULL )
    {
    perror( “failed name_attach()” );
    exit( EXIT_FAILURE );
    }


    /
  • let the Photon library know that it’s supposed to watch
  • the channel associated with the name we’ve attached
    /
    PhChannelAttach( attach->chid, -1, NULL );


    /
  • set up the input function so that it will be called whenever
  • a message is received that is not for Photon; note the “0”
  • as second parameter – we want to be called in response to
  • messages from any process at all
    /
    PtAppAddInput( NULL, 0, inputFunction, NULL );


    /     eliminate ‘unreferenced’ warnings */
    argc = argc, argv = argv;

return( Pt_CONTINUE );
}

************** ends **************************

Here’s what the other side does:

************* begins *************************

coid_to_GUIapp = name_open( “GUIapp”, 0 );

************** ends **************************


I hope this helps.


Norbert Black
QSSL Training Services

3

I will try it!Thank you very much!
“Norbert Black” <nblack@qnx.com> ¼¶¼g©ó¶l¥ó
news:9k931s$flo$1@nntp.qnx.com…

waity <> waity@hongkong.com> > wrote:
I had created a Photon program without PhAB and add a extra message
handler
with PtAppAddInput , my question is how to send message to the Photon
from
other process . I don’t know how to do it because I do not know the
channel
Id of the Photon…


Attach a name using name_attach(), and then let the photon
library know that you want it to watch the resulting channel via
PhChannelAttach().


Here’s a snippet of code for the program that does the name
attach:

************* begins *************************
/*-----------------------------------------------------------
*

  • init - Application initialization function.

---------------------------------------------------------/
int
init( int argc, char argv[] )
{
/

  • attach a name so that other processes can find us
    /
    if( (attach = name_attach( NULL, “GUIapp”, 0 ))
    == NULL )
    {
    perror( “failed name_attach()” );
    exit( EXIT_FAILURE );
    }


    /
  • let the Photon library know that it’s supposed to watch
  • the channel associated with the name we’ve attached
    /
    PhChannelAttach( attach->chid, -1, NULL );


    /
  • set up the input function so that it will be called whenever
  • a message is received that is not for Photon; note the “0”
  • as second parameter – we want to be called in response to
  • messages from any process at all
    /
    PtAppAddInput( NULL, 0, inputFunction, NULL );


    /     eliminate ‘unreferenced’ warnings */
    argc = argc, argv = argv;

return( Pt_CONTINUE );
}

************** ends **************************

Here’s what the other side does:

************* begins *************************

coid_to_GUIapp = name_open( “GUIapp”, 0 );

************** ends **************************


I hope this helps.


Norbert Black
QSSL Training Services