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Shakeeb Alireza

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

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);

t_handle and sysmem_newhandle crash help needed

On Max 9.0.5 running on a MacBook M1 Air laptop, I just observed a very strange reproducible crash, which can be demonstrated  in the  minimal external code below.

 method there are 4 illustrative cases which were tested individually and in each case where a 

-type symbol it crashed. I will include the 

#include "ext.h"
#include "ext_obex.h"
#include "commonsyms.h"

typedef struct _jw
{
    t_object ob;  // the object itself (must be first)
    void* outlet; // one outlet
} t_jw;

void* jw_new(void);
void jw_free(t_jw* x);
void jw_assist(t_jw* x, void* b, long m, long a, char* s);
void jw_bang(t_jw* x);

void* jw_class;

void ext_main(void* r)
{
    t_class* c;

    c = class_new("jw", (method)jw_new, (method)jw_free, (long)sizeof(t_jw),
                  0L /* leave NULL!! */, A_NOTHING, 0);

    class_addmethod(c, (method)jw_bang,   "bang",   0);

    class_register(CLASS_BOX, c);
    jw_class = c;
}

void jw_free(t_jw* x)
{
    ;
}

void* jw_new(void)
{
    t_jw* x = NULL;
    if ((x = (t_jw*)object_alloc(jw_class))) {
        x->outlet = outlet_new(x, NULL);
    }
    return (x);
}

void jw_bang(t_jw* x)
{
    // NO CRASH
    t_object* mytable = (t_object*)object_new(gensym("nobox"), gensym("table"));
    object_free(mytable);

    // CRASH
    t_object* mytable = (t_object*)object_new(_sym_nobox, _sym_table);
    object_free(mytable);

    // NO CRASH
    t_object* jsonwriter = (t_object*)object_new(gensym("nobox"), gensym("jsonwriter"));
    object_free(jsonwriter);

    // CRASH
    t_object* jsonwriter = (t_object*)object_new(_sym_nobox, _sym_jsonwriter);
    object_free(jsonwriter);

    outlet_bang(x->outlet);
}


include(${CMAKE_CURRENT_SOURCE_DIR}/../../max-sdk-base/script/max-pretarget.cmake)

include_directories( 
	"${MAX_SDK_INCLUDES}"
	"${MAX_SDK_MSP_INCLUDES}"
	"${MAX_SDK_JIT_INCLUDES}"
)

file(GLOB PROJECT_SRC
     "*.h"
     "*.c"
     "*.cpp"
)
add_library( 
	${PROJECT_NAME} 
	MODULE
	${PROJECT_SRC}
	"${MAX_SDK_INCLUDES}/common/commonsyms.c"
)

include(${CMAKE_CURRENT_SOURCE_DIR}/../../max-sdk-base/script/max-posttarget.cmake)


On Max 9.0.5 running on a MacBook M1 Air laptop, I just observed a very strange reproducible crash, which can be demonstrated  in the ...

weird-crash-caused-by-use-of-sym-type-symbols-in-an-external-on-max-9

Weird CRASH caused by use of _sym-type symbols in an external on Max 9

danieleghisi

is there a way to produce in a 3rd party external a progressbar on the object box (for vanilla objects), such as the one shown by [stretch~]?

is there a way to produce in a 3rd party external a progressbar on the object box (for vanilla objects), such as the one shown by [stretch~]?

Thanks,
Daniele


Hello everyone, 
is there a way to produce in a 3rd party external a progressbar on the object box (for vanilla objects), such as the one sh

progressbar-as-in-stretch~

I just added an example of how to do this in the Min-DevKit here: https://github.com/Cycling74/min-devkit/blob/master/source/projects/min.progress/min.progress.cpp 

Hi Tim, thanks for pointing that out. The Min framework looks amazing, but I have coded my own package via the C api. Is there a way I could access this function from the standard SDK?
I've seen that in your Min code there's a box() function (which I assume returns the object box?) to which something like a "startprogress" message is to be sent, I imagined that box() may be somehow an higher level abstraction upon the C api, but I cannot seem to find in the github repository the layer where box() is implemented...

Thanks again, 
Daniele


The box() method returns the object's box. You can do this in the traditional SDK with a call to object_obex_get() and using #B as the key. You can then send messages using `object_method()`.

Hi Tim, fantastic, that settles it. I had explored it that route but I was using a pointer to an atom, whereas object_method() seems to need a pointer to a t_atom_float to work. 

Progressbar as in stretch~

Iain Duncan

Hi, an SDK question in case anyone has done this or can point me at resources before I spend time barking up the wrong tree or reinventing things I don't need to. :-)

I would like code in my dsp perform routine to safely get text messages that originated in the main or scheduler thread. The messages could be long, and there could be more than one to consume per DSP pass. I'm assuming I'm need to consume them from some kind of thread-safe buffer. (I'd also like to go the other way eventually). Any tips? 

Hi, an SDK question in case anyone has done this or can point me at resources before I spend time barking up the wrong tree or reinventing...

sdk-question-getting-text-messages-from-main-thread-into-the-dsp-perform-routine

SDK question: getting text messages from main thread into the dsp perform routine?

Connector

i want to prepare my Laptop and GitHub repository for developing c-externals with Max 8.2 SDK, Visual Studio 2022 and CMAKE 3.23.0 for Max 9.0.4. on Windows 10. Therefor i want to clear some points:

I have cloned the max-sdk in my Max 9 Packages Folder like it is described at 

https://github.com/Cycling74/max-sdk/blob/main/README.md

For developing my own c-externals i want to copy and rename existing source code from the 

 folder as a starting Point for modifying the code for my needs. 

After finishing the external I want to push my own c-external Code to my own private GitHub Repository.

But I don't really know how to implement that because the 

Dev Forum