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72 lines
2.2 KiB
72 lines
2.2 KiB
#include <stdio.h>
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#include <pb_encode.h>
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#include <pb_decode.h>
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#include "simple.pb.h"
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int main()
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{
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/* This is the buffer where we will store our message. */
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uint8_t buffer[128];
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size_t message_length;
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bool status;
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/* Encode our message */
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{
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/* Allocate space on the stack to store the message data.
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*
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* Nanopb generates simple struct definitions for all the messages.
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* - check out the contents of simple.pb.h!
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* It is a good idea to always initialize your structures
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* so that you do not have garbage data from RAM in there.
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*/
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SimpleMessage message = SimpleMessage_init_zero;
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/* Create a stream that will write to our buffer. */
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pb_ostream_t stream = pb_ostream_from_buffer(buffer, sizeof(buffer));
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/* Fill in the lucky number */
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message.lucky_number = 13;
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/* Now we are ready to encode the message! */
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status = pb_encode(&stream, SimpleMessage_fields, &message);
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message_length = stream.bytes_written;
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/* Then just check for any errors.. */
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if (!status)
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{
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printf("Encoding failed: %s\n", PB_GET_ERROR(&stream));
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return 1;
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}
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}
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/* Now we could transmit the message over network, store it in a file or
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* wrap it to a pigeon's leg.
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*/
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/* But because we are lazy, we will just decode it immediately. */
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{
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/* Allocate space for the decoded message. */
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SimpleMessage message = SimpleMessage_init_zero;
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/* Create a stream that reads from the buffer. */
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pb_istream_t stream = pb_istream_from_buffer(buffer, message_length);
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/* Now we are ready to decode the message. */
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status = pb_decode(&stream, SimpleMessage_fields, &message);
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/* Check for errors... */
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if (!status)
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{
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printf("Decoding failed: %s\n", PB_GET_ERROR(&stream));
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return 1;
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}
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/* Print the data contained in the message. */
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printf("Your lucky number was %d!\n", message.lucky_number);
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}
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return 0;
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}
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