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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

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) {
t_handle text_handle;
long size;

text_handle = sysmem_newhandle(20000);	
size = sysmem_handlesize(text_handle);
}
------------------------------

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.

short readtohandle(char *name, short volume, char ***h, long *sizep)
{
        t_filehandle fh;
        long size;
        t_handle space;

        if (path_opensysfile(name, volume,&fh, PATH_READ_PERM)) {
                error("%s: can't open", name);
                return (1);
        }
        sysfile_geteof(fh,&size);
        if (!(space = sysmem_newhandle(size)))
        {
                ouchstring("Not enough memory to open %s",name);
                return (1);
        }
        if (sysfile_readtextfile(fh,space,0,TEXT_LB_NATIVE))
        {
                readerror(name);
                sysmem_freehandle(space);
                sysfile_close(fh);
                return (1);
        }
        *h = space;
        *sizep = sysmem_handlesize(space); // could change in sysfile_readtextfile
        sysfile_close(fh);
        return (0);
}


t_handle-and-sysmem_newhandle-crash-help-needed

This sounds like it may be a problem with the Mach-O interface  
exposed in previous versions of MaxAPI.framework. I would suggest  
waiting a little while for a new version of MaxAPI.framework  
(sometime in the next month or two) before calling these functions  
which are crashing (sysmem_handlesize and sysmem_freehandle). In the  
meantime, you could either use Apple APIs for reading files, or use  
CodeWarrior. Sorry for the inconvenience.

Thanks for the reply, I have since implemented my c-based text reader using the sysmem_newptr allocation function. I'm still not clear on the differences between t_handles and the memory allocated by sysmem_newptr.  In any case, my function reads in a text file containing a list of notes, where each line contains things like vel, pitch, length.  I'm posting my code since reading text files into max objects using c code (and Xcode) may be useful for others until new frameworks come out.  WARNING: this is not "good" code, there is no error checking--a mis-formated input file would reap havoc.  The code opens a dialog for the user to pick a file for reading, loads the entire contents into a newly allocated buffer, then parses that buffer line by line using sscanf and the 'n' char as a way to find the start and end of lines.

void myrecorder_open(t_myrecorder* x, long arg) {
   t_atom myList[1];
   SETLONG(myList,arg);			         defer_low(x,(method)myrecorder_do_open,0,1,myList);
}

void myrecorder_do_open(t_myrecorder* x, t_symbol *s, short ac, t_atom *av) {	
	unsigned char p = av->a_w.w_long;
	// text file contains notes that will be stored into a phrase, pointed to by pp
	struct phrase_type * pp = &(x->phrases[p]);
	char filename[128];
	short pathID;
	OSType dstType;	
	t_filehandle *fh;
	char * text_handle;
	long size;
	int bytes_scanned;
	char teststring[128];
	long cur_note;
	int i, start_of_line;

	// note attributes
	long onset, time_from_prev, time_till_next, hand;
	float vel, pitch;

	if (!open_dialog(filename, &pathID, &dstType,0L,0)) { 
		path_opensysfile(filename, pathID, &fh, READ_PERM);
		sysfile_geteof(fh,&size); 		
		post("Storing file into phrase %d", p);
		text_handle = sysmem_newptr(size); 	
		if(text_handle) { // successful allocation				
			if (!sysfile_read(fh, &size, text_handle)) {		
				// phrase variables to adjust:			
				pp->count = 0;
				pp->current_pos = 0;
				pp->total_length = 0;
				pp->tempo = 1.0;
				pp->current_time = 0.0;			
				// first read in the top header line and ignore it
				i=0;
				while(text_handle[i]!='n')
					i++;
				i++;
				start_of_line = i;

				for(i;i
					// search for a n character so we know there's a line				
					if (text_handle[i]=='n') { // found the end of a line
						sscanf(&text_handle[start_of_line],"%d %f %f %d %d %d",&onset,&pitch,
							 &vel,&time_from_prev,&time_till_next,&hand);
						cur_note = pp->count;
						pp->notes[cur_note].onset_time = onset;
						pp->notes[cur_note].pitch = pitch;
						pp->notes[cur_note].vel = vel;
						pp->notes[cur_note].time_from_prev = time_from_prev;
						pp->notes[cur_note].time_till_next = time_till_next;
						pp->notes[cur_note].hand = hand;				
						pp->count++;
						start_of_line = i+1;
					}				
				}

			}
			else 
				post ("error reading file");
		}
		sysmem_freeptr(text_handle);
		else {
			post("memory allocation failed");
		}
		sysfile_close(fh);

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