| #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; |
| message.unlucky.number = 42; |
| |
| /* 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", message.lucky_number); |
| printf("Your unlucky number was %u!\n", message.unlucky.number); |
| } |
| |
| return 0; |
| } |
| |