jamie

I would like to use newinstance() to dynamically load some abstractions

from an external written in C. It works fine for Max abstractions that

operate only in the message domain: I can instantiate the abstractions

However, any MSP objects instantiated with newinstance() don't work,

i.e. they don't get added to the Max/MSP DSP graph.

Is this intentional; a "feature", or is there something I need to do

after the newinstance() call to add the abstractions containing the MSP

I would like to use newinstance() to dynamically load some abstractions
from an external written in C. It works fine for Max abstractions that
operate only in the message domain: I can instantiate the abstractions
and interact with them.

However, any MSP objects instantiated with newinstance() don't work,
i.e. they don't get added to the Max/MSP DSP graph.

Is this intentional; a "feature", or is there something I need to do
after the newinstance() call to add the abstractions containing the MSP
objects to the DSP.

newinstance-2

Quote: jamie wrote on Thu, 22 November 2007 09:02

----------------------------------------------------

> I would like to use newinstance() to dynamically load some abstractions

> from an external written in C. It works fine for Max abstractions that

> operate only in the message domain: I can instantiate the abstractions

> However, any MSP objects instantiated with newinstance() don't work,

> i.e. they don't get added to the Max/MSP DSP graph.

As I understand it newinstance() is for creating max classes (objects) through the C API. I think you should be using fileload() or intload - which is documented as lowload in the writing externals pdf. I have those working for me for DSP stuff.

Someone more knowledgeable may be able to advise more or better...

Quote: jamie wrote on Thu, 22 November 2007 09:02
----------------------------------------------------
>
> Hi,
>
> I would like to use newinstance() to dynamically load some abstractions
> from an external written in C. It works fine for Max abstractions that
> operate only in the message domain: I can instantiate the abstractions
> and interact with them.
>
> However, any MSP objects instantiated with newinstance() don't work,
> i.e. they don't get added to the Max/MSP DSP graph.
>

Creating a new instance in MSP works completely differently than creating

one in Max since your object is going to interact with the DSP signal chain.

Basically you'll have to write your own initialization routine which will

require allocating space for your object, calling the dsp_setup function to

initialize it along with specifying inlets when the object is loaded in, and

then the rest of it is setting up outlets and initializing other members of

your object (it's good to initialize all members of the object at creation).

x = newobject(foome_class); // allocating memory for your object

dsp_setup((t_pxobject *)x, y); // y is your number of inlets

/* the rest of it is initializing members of your own object */

return x; //return the void pointer to the object

dsp_setup() really does a lot of the work here for initialization. I

recommend going through Chapter 15 of the MSP Development part of the

Writing Externals documentation as it disscusses how writing a basic MSP

external works--the interface is pretty simple.

On Nov 22, 2007 8:02 AM, Jamie Bullock wrote:

> Is this intentional; a "feature", or is there something I need to do

> after the newinstance() call to add the abstractions containing the MSP

Creating a new instance in MSP works completely differently than creating
one in Max since your object is going to interact with the DSP signal chain.
Basically you'll have to write your own initialization routine which will
require allocating space for your object, calling the dsp_setup function to
initialize it along with specifying inlets when the object is loaded in, and
then the rest of it is setting up outlets and initializing other members of
your object (it's good to initialize all members of the object at creation).

void *foome_new(void)
{
   t_foome *x;
   x = newobject(foome_class); // allocating memory for your object
   dsp_setup((t_pxobject *)x, y); // y is your number of inlets
   outlet_new((t_foome *)x, "signal");
   outlet_new((t_foome *)x, "signal");
  /* the rest of it is initializing members of your own object */
  return x; //return the void pointer to the object
}

dsp_setup() really does a lot of the work here for initialization. I
recommend going through Chapter 15 of the MSP Development part of the
Writing Externals documentation as it disscusses how writing a basic MSP
external works--the interface is pretty simple.

On Nov 22, 2007 8:02 AM, Jamie Bullock  wrote:

>
> Hi,
>
> I would like to use newinstance() to dynamically load some abstractions
> from an external written in C. It works fine for Max abstractions that
> operate only in the message domain: I can instantiate the abstractions
> and interact with them.
>
> However, any MSP objects instantiated with newinstance() don't work,
> i.e. they don't get added to the Max/MSP DSP graph.
>
> Is this intentional; a "feature", or is there something I need to do
> after the newinstance() call to add the abstractions containing the MSP
> objects to the DSP.
>
> thanks,
>
> Jamie
>
> --
> www.postlude.co.uk
>
>

On Sat, 2007-11-24 at 12:08 -0800, Brandon Nickell wrote:

> dsp_setup() really does a lot of the work here for initialization. I

> recommend going through Chapter 15 of the MSP Development part of the

> Writing Externals documentation as it disscusses how writing a basic

> MSP external works--the interface is pretty simple.

I think you might have misunderstood my question, I am looking to

instantiate an abstraction that contains MSP objects from a function in

an external. I think the code you provided relates to writing an MSP

external, something I am sadly already familiar with.

On Sat, 2007-11-24 at 12:08 -0800, Brandon Nickell wrote:
[snip]
> dsp_setup() really does a lot of the work here for initialization. I
> recommend going through Chapter 15 of the MSP Development part of the
> Writing Externals documentation as it disscusses how writing a basic
> MSP external works--the interface is pretty simple. 

I think you might have misunderstood my question, I am looking to
instantiate an abstraction that contains MSP objects from a function in
an external. I think the code you provided relates to writing an MSP
external, something I am sadly already familiar with.

On Sat, 2007-11-24 at 08:03 -0700, Alex Harker wrote:

> As I understand it newinstance() is for creating max classes (objects) through the C API. I think you should be using fileload() or intload - which is documented as lowload in the writing externals pdf. I have those working for me for DSP stuff.

> Someone more knowledgeable may be able to advise more or better...

Do you have an example of some working code you could share? I just

tried lowload() and fileload(), and like newinstance(), the resulting

abstraction instance doesn't get added to the DSP graph.

>
> As I understand it newinstance() is for creating max classes (objects) through the C API. I think you should be using fileload() or intload - which is documented as lowload in the writing externals pdf. I have those working for me for DSP stuff.
>
> Someone more knowledgeable may be able to advise more or better...
>

Do you have an example of some working code you could share? I just
tried lowload() and fileload(), and like newinstance(), the resulting
abstraction instance doesn't get added to the DSP graph. 

What are the parameters that you're passing into newinstance() look like?

void *mspobj = newinstance(gensym("buffer~"), 0, 0);

post("newinstance() successful: %d", &mspobj);

mess2(mspobj, gensym("read"), bar, baz); //test message to buffer~

freeobject(mspobj); //clean up small test

On Nov 26, 2007 9:03 AM, Jamie Bullock wrote:

> On Sat, 2007-11-24 at 12:08 -0800, Brandon Nickell wrote:

> > dsp_setup() really does a lot of the work here for initialization. I

> > recommend going through Chapter 15 of the MSP Development part of the

> > Writing Externals documentation as it disscusses how writing a basic

> > MSP external works--the interface is pretty simple.

> I think you might have misunderstood my question, I am looking to

> instantiate an abstraction that contains MSP objects from a function in

> an external. I think the code you provided relates to writing an MSP

> external, something I am sadly already familiar with.

void foo()
{
   void *mspobj = newinstance(gensym("buffer~"), 0, 0);
   void *bar, *baz;
   if(mspobj) {
       post("newinstance() successful: %d", &mspobj);
       mess2(mspobj, gensym("read"), bar, baz); //test message to buffer~
   }
   else
       post("newinstance() failed (return 0)");

   freeobject(mspobj);  //clean up small test
}

On Nov 26, 2007 9:03 AM, Jamie Bullock  wrote:

>
> Hi Brandon,
>
> Thanks for the quick reply.
>
> On Sat, 2007-11-24 at 12:08 -0800, Brandon Nickell wrote:
> [snip]
> > dsp_setup() really does a lot of the work here for initialization. I
> > recommend going through Chapter 15 of the MSP Development part of the
> > Writing Externals documentation as it disscusses how writing a basic
> > MSP external works--the interface is pretty simple.
>
> I think you might have misunderstood my question, I am looking to
> instantiate an abstraction that contains MSP objects from a function in
> an external. I think the code you provided relates to writing an MSP
> external, something I am sadly already familiar with.
>
> Jamie
>
> --
> www.postlude.co.uk
>
>

Is there a contemporary example of this? This code crashes my machine:

t_atom at[2];
    atom_setsym(at, gensym("asd"));
    atom_setlong(&at[2], 5000);
    
    t_object *mspobj = (t_object*)newinstance(gensym("buffer~"), 2, at);
    if(mspobj) {
        post("newinstance() successful: %d", &mspobj);
   //     mess2(mspobj, gensym("open"),0,0); //test message to buffer~
    }
    else
        post("newinstance() failed (return 0)");
    
    
    freeobject(mspobj);  //clean up small test

Is there a contemporary example of this?  This code crashes my machine:


I've been doing stuff of this kind lately. My approach is first, creating a patch; and then placing objects in it through sprintf_newobject(). This loads an abstraction, but it works all the same for objects.

x->patch = (t_patcher*) object_new_typed(CLASS_NOBOX, gensym("jpatcher"), 0, NULL);
newobject_sprintf(x->patch, "@maxclass newobj @text \"thetestpatch\"");

Hi,
I've been doing stuff of this kind lately. My approach is first, creating a patch; and then placing objects in it through sprintf_newobject(). This loads an abstraction, but it works all the same for objects.

Andrea does this work on msp stuff??? I thought I had to call dsp_setup or something…

Andrea does this work on msp stuff???   I thought I had to call dsp_setup or something…