So i'm trying to create a simple der encoder, and I have followed the step by step example in the asn1c involving regangle.h, however, I have modified it slightly to fit the asn.1 module I have created. When I try to compile, however I keep getting this error

/Desktop/asn1c/constr_TYPE.h:97:2: error: unknown type name ‘der_type_encoder_f’
In file included from /Desktop/asn1c/constr_TYPE.h:15:0:
/Desktop/asn1c/ber_tlv_length.h:36:2: warning: ‘struct asn_codec_ctx_s’ declared inside parameter list [enabled by default]
/Desktop/asn1c/ber_tlv_length.h:36:2: warning: its scope is only this definition or declaration, which is probably not what you want [enabled by default]
In file included from /Desktop/asn1c/constr_TYPE.h:15:0:
/Desktop/asn1c/ber_tlv_length.h:36:2: warning: ‘struct asn_codec_ctx_s’ declared inside parameter list [enabled by default]
/Desktop/asn1c/ber_tlv_length.h:36:2: warning: its scope is only this definition or declaration, which is probably not what you want [enabled by default]
/Desktop/asn1c/constraints.h:43:2: error: unknown type name ‘asn_app_constraint_failed_f’
/Desktop/asn1c/constraints.h:51:1: error: unknown type name ‘asn_constr_check_f’
/Desktop/asn1c/constraints.h:52:1: error: unknown type name ‘asn_constr_check_f’
make: *** [ecoder_test] Error 1

I have those types explicitly defined. Below I have posted the main program, the program I beleive is causing the issue, as well as my makefile.

This is the main.c file that mimics the rectangle.h file in the manual:

include <stdio.h>

include <stdlib.h>

include <sys types.h="">

include "/Desktop/asn1c/BACnet-SimpleACK-PDU.h"

include "/Desktop/asn1c/asn_application.h"

include "/Desktop/asn1c/constr_TYPE.h"

include "/Desktop/asn1c/der_encoder.h"

static int write_out(const void *buffer, size_t size, void *app_key){
        FILE *out_fp = app_key;
        size_t wrote = fwrite(buffer, 1, size, out_fp);
        return (wrote == size) ? 0 : -1;
        }

int main(int ac, char **av){
        BACnet_SimpleACK_PDU_t *bacnet_simpleack_pdu;
        asn_enc_rval_t ec;

bacnet_simpleack_pdu = calloc(1, sizeof(BACnet_SimpleACK_PDU_t));

bacnet_simpleack_pdu -> pdu_type = 15;
bacnet_simpleack_pdu -> reserved = 0;
bacnet_simpleack_pdu -> invokeID = 45;
bacnet_simpleack_pdu -> service_ACK_choice = 0;

const char filename = av[1];
FILE fp;
fp = fopen(filename, "wb");

ec = der_encode(&asn_DEF_BACnet_SimpleACK_PDU, bacnet_simpleack_pdu, write_out, fp);
fclose(fp);
}

This next file is constr_TYPE.h, and this is where the "unknown type name" error is occurring:

ifndef CONSTR_TYPE_H

#define CONSTR_TYPE_H
#include "ber_tlv_length.h"
#include "ber_tlv_tag.h"

#ifdef __cplusplus
extern "C" {
#endif

struct asn_TYPE_descriptor_s; / Forward declaration /
struct asn_TYPE_member_s; / Forward declaration /

/
* This type provides the context information for various ASN.1 routines,
* primarily ones doing decoding. A member _asn_ctx of this type must be
* included into certain target language's structures, such as compound types.
/
typedef struct asn_struct_ctx_s {
short phase; / Decoding phase /
short step; / Elementary step of a phase /
int context; / Other context information /
void ptr; / Decoder-specific stuff (stack elements) /
ber_tlv_len_t left; / Number of bytes left, -1 for indefinite */
} asn_struct_ctx_t;

#include "ber_decoder.h" / Basic Encoding Rules decoder /
#include "der_encoder.h" / Distinguished Encoding Rules encoder /
#include "xer_decoder.h" / Decoder of XER (XML, text) /
#include "xer_encoder.h" / Encoder into XER (XML, text) /
#include "per_decoder.h" / Packet Encoding Rules decoder /
#include "per_encoder.h" / Packet Encoding Rules encoder /
#include "constraints.h" / Subtype constraints support /

/
* Free the structure according to its specification.
* If (free_contents_only) is set, the wrapper structure itself (struct_ptr)
* will not be freed. (It may be useful in case the structure is allocated
* statically or arranged on the stack, yet its elements are allocated
* dynamically.)
/
typedef void (asn_struct_free_f)(
struct asn_TYPE_descriptor_s type_descriptor,
void struct_ptr, int free_contents_only);
#define ASN_STRUCT_FREE(asn_DEF, ptr) (asn_DEF).free_struct(&(asn_DEF),ptr,0)
#define ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF, ptr) \ (asn_DEF).free_struct(&(asn_DEF),ptr,1)
short phase; / Decoding phase /
short step; / Elementary step of a phase /
int context; / Other context information /
void ptr; / Decoder-specific stuff (stack elements) /
ber_tlv_len_t left; / Number of bytes left, -1 for indefinite */
} asn_struct_ctx_t;

#include "ber_decoder.h"        /* Basic Encoding Rules decoder */
#include "der_encoder.h"        /* Distinguished Encoding Rules encoder */
#include "xer_decoder.h"        /* Decoder of XER (XML, text) */
#include "xer_encoder.h"        /* Encoder into XER (XML, text) */
#include "per_decoder.h"        /* Packet Encoding Rules decoder */
#include "per_encoder.h"        /* Packet Encoding Rules encoder */
#include "constraints.h"        /* Subtype constraints support */

/*
 * Free the structure according to its specification.
 * If (free_contents_only) is set, the wrapper structure itself (struct_ptr)
 * will not be freed. (It may be useful in case the structure is allocated
 * statically or arranged on the stack, yet its elements are allocated
 * dynamically.)
 */
 typedef void (asn_struct_free_f)(
        struct asn_TYPE_descriptor_s *type_descriptor,
        void *struct_ptr, int free_contents_only);
#define ASN_STRUCT_FREE(asn_DEF, ptr)   (asn_DEF).free_struct(&(asn_DEF),ptr,0)
#define ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF, ptr)     \
                                (asn_DEF).free_struct(&(asn_DEF),ptr,1)

 /*
  * Print the structure according to its specification.
  */
  typedef int (asn_struct_print_f)(
        struct asn_TYPE_descriptor_s *type_descriptor,
        const void *struct_ptr,
        int level,      /* Indentation level */
        asn_app_consume_bytes_f *callback, void *app_key);

 /*
  * Return the outmost tag of the type.
  * If the type is untagged CHOICE, the dynamic operation is performed.
  * NOTE: This function pointer type is only useful internally.
  * Do not use it in your application.
  */
  typedef ber_tlv_tag_t (asn_outmost_tag_f)(
        struct asn_TYPE_descriptor_s *type_descriptor,
        const void *struct_ptr, int tag_mode, ber_tlv_tag_t tag);
  /* The instance of the above function type; used internally. */
  asn_outmost_tag_f asn_TYPE_outmost_tag;

  ^L
  /*
   * The definitive description of the destination language's structure.
   */
   typedef struct asn_TYPE_descriptor_s {
   char *name;     /* A name of the ASN.1 type. "" in some cases. */
   char *xml_tag;  /* Name used in XML tag */
         /*
 * Generalized functions for dealing with the specific type.
 * May be directly invoked by applications.
 */
asn_struct_free_f  *free_struct;        /* Free the structure */
asn_struct_print_f *print_struct;       /* Human readable output */
asn_constr_check_f *check_constraints;  /* Constraints validator */
ber_type_decoder_f *ber_decoder;        /* Generic BER decoder */
der_type_encoder_f *der_encoder;        /* Canonical DER encoder */
xer_type_decoder_f *xer_decoder;        /* Generic XER decoder */
xer_type_encoder_f *xer_encoder;        /* [Canonical] XER encoder */
per_type_decoder_f *uper_decoder;       /* Unaligned PER decoder */
per_type_encoder_f *uper_encoder;       /* Unaligned PER encoder */

/***********************************************************************
 * Internally useful members. Not to be used by applications directly. *
 **********************************************************************/

/*
 * Tags that are expected to occur.
 */
asn_outmost_tag_f  *outmost_tag;        /* <optional, internal> */
ber_tlv_tag_t *tags;    /* Effective tags sequence for this type */
int tags_count;         /* Number of tags which are expected */
ber_tlv_tag_t *all_tags;/* Every tag for BER/containment */
int all_tags_count;     /* Number of tags */

asn_per_constraints_t *per_constraints; /* PER compiled constraints */

/*
  * An ASN.1 production type members (members of SEQUENCE, SET, CHOICE).
 */
struct asn_TYPE_member_s *elements;
int elements_count;

/*
 * Additional information describing the type, used by appropriate
 * functions above.
 */
void *specifics;
} asn_TYPE_descriptor_t;

/
* This type describes an element of the constructed type,
* i.e. SEQUENCE, SET, CHOICE, etc.
/
enum asn_TYPE_flags_e {
ATF_NOFLAGS,
ATF_POINTER = 0x01, / Represented by the pointer /
ATF_OPEN_TYPE = 0x02 / ANY type, without meaningful tag /
};
typedef struct asn_TYPE_member_s {
enum asn_TYPE_flags_e flags; / Element's presentation flags /
int optional; / Following optional members, including current /
int memb_offset; / Offset of the element /
ber_tlv_tag_t tag; / Outmost (most immediate) tag /
int tag_mode; / IMPLICIT/no/EXPLICIT tag at current level /
asn_TYPE_descriptor_t type; / Member type descriptor /
asn_constr_check_f memb_constraints; / Constraints validator /
asn_per_constraints_t per_constraints; / PER compiled constraints /
int (default_value)(int setval, void sptr); / DEFAULT <value> /
char name; / ASN.1 identifier of the element */
} asn_TYPE_member_t;

/
* BER tag to element number mapping.
/
typedef struct asn_TYPE_tag2member_s {
ber_tlv_tag_t el_tag; / Outmost tag of the member /
int el_no; / Index of the associated member, base 0 /
int toff_first; / First occurence of the el_tag, relative /
int toff_last; / Last occurence of the el_tag, relatvie /
} asn_TYPE_tag2member_t;

/*
 * This function is a wrapper around (td)->print_struct, which prints out
 * the contents of the target language's structure (struct_ptr) into the
 * file pointer (stream) in human readable form.
 * RETURN VALUES:
 *       0: The structure is printed.
 *      -1: Problem dumping the structure.
 * (See also xer_fprint() in xer_encoder.h)
 */
   int asn_fprint(FILE *stream,            /* Destination stream descriptor */
   asn_TYPE_descriptor_t *td,      /* ASN.1 type descriptor */
   const void *struct_ptr);        /* Structure to be printed */

  #ifdef __cplusplus
  }

 #endif

The next excerpt if from der_encoder.h it is the definition of der_type_encoder_f:

typedef asn_enc_rval_t (der_type_encoder_f) (
struct asn_TYPE_descriptor_s type_descriptor,
void struct_ptr, / Structure to be encoded /
int tag_mode, / {-1,0,1}: IMPLICIT, no, EXPLICIT /
ber_tlv_tag_t tag,
asn_app_consume_bytes_f consume_bytes_cb, / Callback /
void app_key / Arbitrary callback argument /
);

and below, lastly is my makefile:
ecoder_test: ecoder_test.c /Desktop/asn1c/BACnet-SimpleACK-PDU.h /Desktop/asn1c/OSUINT.h /Desktop/asn1c/BACnetConfirmedServiceChoice.h /Desktop/asn1c/constr_SEQUENCE.h /Desktop/asn1c/constr_TYPE.h /Desktop/asn1c/asn_application.h /Desktop/asn1c/der_encoder.h /Desktop/asn1c/ber_tlv_length.h
gcc ecoder_test.c /Desktop/asn1c/BACnet-SimpleACK-PDU.h /Desktop/asn1c/OSUINT.h /Desktop/asn1c/BACnetConfirmedServiceChoice.h /Desktop/asn1c/constr_SEQUENCE.h /Desktop/asn1c/constr_TYPE.h /Desktop/asn1c/asn_application.h /Desktop/asn1c/der_encoder.h /Desktop/asn1c/ber_tlv_length.h -o ecoder_test

if anyone spots anything glaringly obvious, or if this is just completely wrong, and could point out where that would be very much appreciated.

Modified Rectangle.h

Go to github.com/vlm/asn1c for the latest version.

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Modified Rectangle.h

include <stdio.h>

include <stdlib.h>

include <sys types.h="">

include "/Desktop/asn1c/BACnet-SimpleACK-PDU.h"

include "/Desktop/asn1c/asn_application.h"

include "/Desktop/asn1c/constr_TYPE.h"

include "/Desktop/asn1c/der_encoder.h"

ifndef CONSTR_TYPE_H

Modified Rectangle.h

Go to github.com/vlm/asn1c for the latest version.

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Help

Modified Rectangle.h document.SUBSCRIPTION_OPTIONS = { "thing": "topic", "subscribed": false, "url": "subscribe", "icon": { "css": "fa fa-envelope-o" } };

include <stdio.h>

include <stdlib.h>

include <sys types.h="">

include "/Desktop/asn1c/BACnet-SimpleACK-PDU.h"

include "/Desktop/asn1c/asn_application.h"

include "/Desktop/asn1c/constr_TYPE.h"

include "/Desktop/asn1c/der_encoder.h"

ifndef CONSTR_TYPE_H

Modified Rectangle.h