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author | 2016-10-03 12:58:02 -0700 | |
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committer | 2016-10-03 12:58:02 -0700 | |
commit | 1bb0ce5e23126692169765496221c58da7310a2b (patch) | |
tree | 843cd832adfff4898c13b20b4f05f7b312c0eb16 /third_party/nanopb/examples/cmake_simple/simple.c | |
parent | e2180f069d25e7572471cd0336db6a06c0ea848d (diff) | |
parent | 787d58f9e36487d0703425b9b1d30dd658c42728 (diff) |
Merge branch 'direct-calls' into buffer_pools_for_realsies
Diffstat (limited to 'third_party/nanopb/examples/cmake_simple/simple.c')
-rw-r--r-- | third_party/nanopb/examples/cmake_simple/simple.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/third_party/nanopb/examples/cmake_simple/simple.c b/third_party/nanopb/examples/cmake_simple/simple.c new file mode 100644 index 0000000000..1f6b137351 --- /dev/null +++ b/third_party/nanopb/examples/cmake_simple/simple.c @@ -0,0 +1,71 @@ +#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", message.lucky_number); + } + + return 0; +} + |