/usr/bin/ld: converter-sample.o:(.data.rel+0x0): undefined reference to `asn_DEF_PDU' about asn1c HOT 3 CLOSED

PDU is usually the the top most object you want to decode.

By setting the -DPDU option then the converter-sample will via. macros set the PDU you want to decode. Otherwise you would have to program it yourself manually.

Look at the quickstart example

You could for example have a grammar like this:

TestModule DEFINITIONS ::= BEGIN 
    
    Circle ::= SEQUENCE { 
        position-x INTEGER, 
        position-y INTEGER, 
        radius INTEGER (0..MAX) 
    }
    
    Rectangle::= SEQUENCE { 
        length INTEGER, 
        width INTEGER
    }
     
END 

Because this effectively have two PDUs to choose from you could make two different converters from it like so

gcc -DPDU=Circle -I. -o CircleDecoder.exe *.c
and
gcc -DPDU=Rectangle -I. -o RectangleDecoder.exe *.c

In order to better understand the preprocessors in converter-example.
You can try passing -E to gcc as you compile. This will generate a .i file that shows the value after preprocessing.

from asn1c.

There are multiple ways to do this. Again read the quickstart example
And there is also the documentation.
It is hard to help when I can't see the code. And i don't know what you want to decode it to.

Long code short.

char buf[1024]; /* Temporary buffer */
asn_dec_rval_t rval; /* Decoder return value */
Circle_t *circle = 0; /* Type to decode. Note this 0! */
FILE *fp; /* Input file handler */
size_t size; /* Number of bytes read */
char *filename="E:\\path\\to\\der\\data.der"; /* Input file name */

/* Open input file as read-only binary */
fp = fopen(filename, "rb");
if(!fp) {
    perror(filename);
    exit(1);
}

/* Read up to the buffer size */
size = fread(buf, 1, sizeof(buf), fp);
fclose(fp);

if(!size) {
    fprintf(stderr, "%s: Empty or broken\n", filename);
    exit(1);
}

/* Decode the input buffer as circle type */
rval = ber_decode(0, &asn_DEF_Circle, (void **)&circle, buf, size);

if(rval.code != RC_OK) {
    fprintf(stderr, "%s: Broken Circle encoding at byte %ld\n", filename, (long)rval.consumed);
    exit(1);
}

/*Encode to whatever you want into a buffer*/
// choose what output should be
enum asn_transfer_syntax osyntax = ATS_BASIC_XER;
asn_TYPE_descriptor_t *pduType = &asn_DEF_Circle;
asn_encode_to_new_buffer_result_t res = asn_encode_to_new_buffer(NULL, osyntax, pdutype, circle);

from asn1c.

Hey I tried this and I am getting the decoder. Now the decoder takes an argument iber which is what I understand is the ber encoded data. Now I have a ber encoded string which I want to decode, how should I pass it to the decoder? I tried passing it directly but that didn't worked.

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