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Joe Kaplan

 there is mentioned a "value" attribute.  Can anyone share some additional detail on what this attribute is and what it does?

I discovered that it only works if the type is set to "number".  Otherwise it returns a funky compiler error. 

To my knowledge, pattr can handle all the attributes of an object, including attributes of any type.  Not simply number attributes called "value."  So I don't understand what this attribute would be used for.

I am writing a UI object, and I'd like to persist a string between sessions.  Save the string with the patch, and recall the saved string on load.

I think the "savestate" message would be ideal for my purpose.  But I also discovered that "savestate" doesn't work with UI objects.  So I thought maybe persisting the string through pattr using this "Value" attribute might be possible.  But I'm not really understanding what this is or how it works.

Ideally the string would be internal to the object, and so not externally represented as an attribute, but at this point I'm willing to consider anything.  

In the Min Devkit docs there is mentioned a "value" attribute.  Can anyone share some additional detail on what this attribute is and what...

what-is-the-value-attribute

What is the "value" attribute?

Iwan Paturel

I'm using the RNBO export function and the VCV rack SDK to translate my RNBO patches into Rack modules. I'm trying to hack a little bit into the system (module.cpp, rnbo_source.cpp and others) in order to be able to control the appearance of the final module directly from the parameters or in/outlets metadata field. 

The issue is that there is no implementation of the "meta" field in the rnbo c++ export. Well, it does exist in the "description.json", but there is no solution implemented to access it easily, meaning that the field doesn't exit in the "rnbo_source.cpp", neither in the "ParameterInfo" struct in "RNBO_Types.h" : 

struct ParameterInfo
	{
		ParameterType type;
		IOType ioType = IOTypeUndefined;
		ParameterValue min = 0.;
		ParameterValue max = 1.;
		ParameterValue initialValue = 0.;
		ParameterValue exponent = 1.;
		int steps = 0; // 0 = continuous, 1 = toggle, 2+ indicates steps in the normalized representation
		bool debug = false;
		bool saveable = false;
		bool transmittable = false;
		bool initialized = false;
		bool visible = false;
		const char **enumValues = nullptr;
		const char *displayName = "";
		const char *unit = "";
		SignalIndex signalIndex = INVALID_INDEX;
	};


As these files are generated by RNBO during the export, I cannot modify them in order to have the informations needed. I don't want my first option to be to parse the .json file... Is there any way that I could get the metadata directly from the RNBO export in a way similar to the ParameterInfo struct ? 

Hi everyone, 

I'm using the RNBO export function and the VCV rack SDK to translate my RNBO patches into Rack modules. I'm trying to hack a...

getting-the-rnbo-parameters-metadata-with-a-getter-from-the-rnbosourcecpp-or-similar

Getting the RNBO parameters metadata with a getter from the rnbo_source.cpp (or similar)

Shakeeb Alireza

This is more of a personal observation: as I've been playing around with the 

, which I find quite nice and clean in terms of the overall design, I keep arriving at the conclusion that the use of macros,  like 

 which hide  important parameter signatures and return values of the lambdas or functions they replace, may make the api more difficult for newcomers to understand, especially if they are coming from using the c-based max-sdk.

This was indeed the case for me: I found the long form conveyed  a lot more  information than the abbreviated macro usage and end up replacing all instances of 

[this](const c74::min::atoms& args, const int inlet) -> c74::min::atoms

[this](const atoms& args, const int inlet) -> atoms

with the clearer and only 2 chars longer: 

To be fair, I'm not all suggesting to remove such macros, as I assume once you get used to the api, you can reach out to the abbreviated form more readily, but just in the beginning of the learning curve, they read like an intermediate DSL on top of supposedly hairy c++ details ,  except that once you want to do anything that's not basic, you have to understand what lies below and notice that the c++ details, at least the ones that are not complex templates, are relatively straightforward.

This is more of a personal observation: as I've been playing around with the min-api, which I find quite nice and clean in terms of the...

the-loss-of-readability-due-to-hiding-callback-signatures-behind-macros-in-min-api

Macros can make the min-api more difficult to understand

void Myclass::handle_float_output(outlet<> output, float value);

This compiles ok, but when one tries to use it raises an error:

call to implicitly-deleted copy constructor of 'outlet<>'

Any idea how to do this in min-api? In the c-based 

, this is trivial to do as outlets have the 

In min-api,  is there a way to use / call an outlet<> instance as a parameter in a method?

For example:

void...

using-an-outlet-as-a-method-parameter-in-min-api

Using an outlet as a method parameter in min-api

Alex Harker's externals collection to cmake-based builds

, I found that I couldn't build two of the externals due to missing  Max SDK 8.20 support for 3 methods which were in 

These are not referenced in the api docs nor used in the 

 example in the max-sdk, but they do appear in the 

I would love to know if there is are any known work-arounds for these methods via 

While I was converting Alex Harker's externals collection to cmake-based builds, I found that I couldn't build two of the externals due to...

missing-jdataview-methods-in-max-sdk-820

Missing jdataview  methods in Max SDK 8.20

Jan M

To brush up a bit my C++ knowledge and out of curiosity I started to dip my toes into the Min-Devkit.

As a starting project I chose to work on a new implementation of an object to connect to the ENTTEC DMX USB Pro, because it has a simple serial API and offers some interesting possibilities like multithreading, concurrency etc. One object I am working on is called [jam.dmxusbpro].

As part of the project I want to allow only one instance of  [jam.dmxusbpro] to be able to open a serial port to an  ENTTEC DMX USB Pro. 

The way implemented this is by creating a separate device manager class - a singleton - that tracks which devices are opened by which instance of  [jam.dmxusbpro] . That works fine between objects off the same class.

As a second step I am creating another object, called  [jam.dmxusbpro~] that allows to control DMX channels with MSP signals.

However, my approach of using a singleton device manager class only works within instances of the same Max object not between  [jam.dmxusbpro] and   [jam.dmxusbpro~].

Is there a way to share data between different Max objects using the Min-DevKit?

PS: I am working on MacOS and am using the POSIX termios API to open the serial ports.

PPS: Min-DevKit is a great addition!! It got me started very fast and is easily accessible for me who's working more in other languages and has a quite basic experience with C and C++.

To brush up a bit my C++ knowledge and out of curiosity I started to dip my toes into the Min-Devkit.

As a starting project I chose to...

min-devkit-sharing-data-between-objects

Min-DevKit sharing data between objects

gtg137p@mail.gatech.edu

Hi, I'm trying to read in a text file with sysfile_readtextfile, but I'm running into crashes using sysmem commands. Specifically, the following code (called thru defer_low) crashes:

void myrecorder_do_open(t_myrecorder* x, t_symbol *s, short ac, t_atom *av) {

text_handle = sysmem_newhandle(20000);    

When I remove the sysmem_handlesize line it doesn't crash. I also printed out the text_handle pointer to make sure it wasn't NULL.

Calls to sysmem_freehandle(&text_handle) crash Max as well.

My plan was to sscanf thru the text_handle after filling it with the contents from a text file. Any suggestions or example code would be greatly appreciated. I'm developing using XCode, running Max 4.5.

I've already been scouring the archives and only found this example of using t_handles: (which also crashes)

short readtohandle(char *name, short volume, char ***h, long *sizep)

if (path_opensysfile(name, volume,&fh, PATH_READ_PERM)) {

ouchstring("Not enough memory to open %s",name);

if (sysfile_readtextfile(fh,space,0,TEXT_LB_NATIVE))

*sizep = sysmem_handlesize(space); // could change in sysfile_readtextfile

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