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 like syntax an in an external, similar to 

 parameters retrieved in the C code? Are there any example or documentation in the SDK ? I could not find any. Thanks.

I would like to implement @param_name like syntax an in an external, similar to metro @active 1 @defer 1. How are those @param_name val parameters retrieved in the C code?  Are there any example or documentation in the SDK ? I could not find any. Thanks.

I would like to implement @param_name like syntax an in an external, similar to metro @active 1 @defer 1. How are those @param_name val para

how-to-implement-param-model-in-an-external-object

https://cycling74.com/sdk/max-sdk-7.3.3/html/chapter_msgattached.html#chapter_msgattached_attrs

CLASS_ATTR_DOUBLE(c, "m_arg1", 0, t_faust, m_arg1);

CLASS_ATTR_DOUBLE(c, "m_arg2", 0, t_faust, m_arg2);

, hoping the m_arg1/m_arg2 would be written with the 0.5/1.5 values. It does not seem to work. Is is supposed to be enough?

Another question: it il possible for an attribute to refer to an arbitrary memory location instead of a field of the struct like m_arg1/m_arg2 described before ?

1) add fields in the struct:
double m_arg1;
double m_arg2;

2) then add the declaration in main:
CLASS_ATTR_DOUBLE(c, "m_arg1", 0, t_faust, m_arg1);
CLASS_ATTR_DOUBLE(c, "m_arg2", 0, t_faust, m_arg2);

I tried to allocate the object with foo @m_arg1 0.5 @m_arg2 1.5, hoping the m_arg1/m_arg2 would be written with the  0.5/1.5 values. It does not seem to work. Is is supposed to be enough? 

Another question: it il possible for an attribute to refer to an arbitrary memory location instead of a field of  the struct like m_arg1/m_arg2 described before  ? 

Sorry Stéphane , I don't have access to my C dev archives from home and can't help much more (I dont even have Xcode at hand)…

But there are some examples using patter in the SDK, just do a multi file search on the SDK folder with "CLASS_ATTR", and you'll find for instance the /basics/attrtest project.

Sorry Stéphane , I don't have access to my C dev archives from home and can't help much more (I dont even have Xcode at hand)…
But there are some examples using patter in the SDK, just do a multi file search on the SDK folder  with "CLASS_ATTR", and you'll find for instance the /basics/attrtest project.
Good luck!

Shouldn't you call attr_args_process() in the _new() function?

I did that and it works, but... as soon as the 

) are not received anymore in the C++ code (I'm using the 

method to handle all incoming messages), and 

syntax has to be used. This is not the case for standard Max objects.

I did that and it works, but... as soon as the @param attribute is in place, regular param  (thats is without the @ character) are not received anymore in the C++ code (I'm using the anythingmethod to handle all incoming messages), and @param syntax has to be used. This is not the case for standard Max objects.

So what is the way to have this 1) @param attribute model 2) keep the regular param syntax for messages ?

Sorry I still can't help much (still no Xcode) , and my C is now very rusty but as nobody helped you here I am again.

I found some old code of mine, not sure it will help but I see I used object_attr_setlong () in the setters instead of directly setting the values in the object struct (see the comment). This is the setter for the 

class_addmethod(c, (method)sfmarkers_outputMode,    "mode",     A_LONG, 0);

CLASS_ATTR_LONG (c, "format", 0, t_sfmarkers, outputMode);
CLASS_ATTR_STYLE_LABEL (c, "format", 0, "enumindex", "Markers time format");
CLASS_ATTR_ENUMINDEX  (c, "format", 0, "ms sample");
CLASS_ATTR_CATEGORY (c, "format", 0, "sfmarkers~");
CLASS_ATTR_SAVE (c, "format", 0);


void sfmarkers_outputMode (t_sfmarkers *x, long outputMode)
{
    if (outputMode != 0 && outputMode != 1)
        object_error ((t_object *)x, "OutputMode accepts only 0 or 1");
    else
        // x->outputMode = outputMode;  <- no more with attributes
        object_attr_setlong(x, gensym ("format"), outputMode);
}

Sorry I still can't help much (still no Xcode) , and my C is now very rusty but as nobody helped you here I am again.
I found some old code of mine, not sure it will help but I see I used object_attr_setlong () in the setters instead of directly setting the values in the object struct (see the comment). This is the setter for the outputMode function, expecting a long.


void sfmarkers_outputMode (t_sfmarkers *x, long outputMode)
{
	if (outputMode != 0 && outputMode != 1)
		object_error ((t_object *)x, "OutputMode accepts only 0 or 1");
	else
		// x->outputMode = outputMode;  <- no more with attributes
        object_attr_setlong(x, gensym ("format"), outputMode);
}

If you're using C, you're welcome to look at how I did it in mine:

https://github.com/iainctduncan/scheme-for-max/blob/master/s4m/s4m.c

If you're using C, you're welcome to look at how I did it in mine:
https://github.com/iainctduncan/scheme-for-max/blob/master/s4m/s4m.c

Thanks IAIN DUNCAN for you code sample. I can now use the CLASS_ATTR_ACCESSORS model, but I see that you're defining 2 different functions (

in your code) to handle the 2 different cases. 

that would also get the attribute name ? I see the unused 

but I don't see if it could be used for that purpose...

Thanks IAIN DUNCAN for you code sample. I can now use the  CLASS_ATTR_ACCESSORS model, but I see that you're defining 2 different functions (s4m_inlets_set and s4m_outlets_setin your code) to handle the 2 different cases. 
Is there a way to have a unique generic function that would also get the attribute name ? I see the unused t_object *attr second argument in s4m_inlets_set and s4m_outlets_set,but I don't see if it could be used for that purpose...
Thanks.

Inside your generic attribute function you can query the attribute for its name using precisely the 

t_symbol *attrname = (t_symbol *)object_method(attr, gensym("getname"));

This way you can use the same accessor method for multiple attributes.

Good question. Yes, there is a way.
Inside your generic attribute function you can query the attribute for its name using precisely the t_object *attr argument.

Example:
t_symbol *attrname = (t_symbol *)object_method(attr, gensym("getname"));

This way you can use the same accessor method for multiple attributes.
Hope this helps.

How to implement @param model in an external object?