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5866b34 Jan 6, 2018
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#include <stdio.h>
#include <pb_encode.h>
#include <pb_decode.h>
#include "simple.pb.h"
int main()
{
/* This is the buffer where we will store our message. */
uint8_t buffer[128];
size_t message_length;
bool status;
/* Encode our message */
{
/* Allocate space on the stack to store the message data.
*
* Nanopb generates simple struct definitions for all the messages.
* - check out the contents of simple.pb.h!
* It is a good idea to always initialize your structures
* so that you do not have garbage data from RAM in there.
*/
SimpleMessage message = SimpleMessage_init_zero;
/* Create a stream that will write to our buffer. */
pb_ostream_t stream = pb_ostream_from_buffer(buffer, sizeof(buffer));
/* Fill in the lucky number */
message.lucky_number = 13;
/* Now we are ready to encode the message! */
status = pb_encode(&stream, SimpleMessage_fields, &message);
message_length = stream.bytes_written;
/* Then just check for any errors.. */
if (!status)
{
printf("Encoding failed: %s\n", PB_GET_ERROR(&stream));
return 1;
}
}
/* Now we could transmit the message over network, store it in a file or
* wrap it to a pigeon's leg.
*/
/* But because we are lazy, we will just decode it immediately. */
{
/* Allocate space for the decoded message. */
SimpleMessage message = SimpleMessage_init_zero;
/* Create a stream that reads from the buffer. */
pb_istream_t stream = pb_istream_from_buffer(buffer, message_length);
/* Now we are ready to decode the message. */
status = pb_decode(&stream, SimpleMessage_fields, &message);
/* Check for errors... */
if (!status)
{
printf("Decoding failed: %s\n", PB_GET_ERROR(&stream));
return 1;
}
/* Print the data contained in the message. */
printf("Your lucky number was %d!\n", (int)message.lucky_number);
}
return 0;
}