eCAL and Python

[rex-schilasky]

How to create a simple python / protobuf application ?

[rex-schilasky]

These sample should get you started:

person_snd:
https://github.com/continental/ecal/blob/master/samples/python/person_snd/person_snd.py

person_rec:
https://github.com/continental/ecal/blob/master/samples/python/person_rec/person_rec.py

The proto files for the samples are located in the ../_protobuf directory. When you write your own .proto files, you must of course first compile the python representation for those:

protoc -I=$SRC_DIR --python_out=$DST_DIR $SRC_DIR/your_proto_file.proto

(Source: https://developers.google.com/protocol-buffers/docs/pythontutorial#compiling-your-protocol-buffers)

To get started writing .proto files, you may want to look at the proto3 tutorial:
https://developers.google.com/protocol-buffers/docs/proto3

The syntax of Protobuf is quite simple, you only have a few primitive datatypes (bool, int32, double...). If you want to create a more complex datatype, you basically define another message and use it as datatype. To create arrays, you use the repeated keyword

message SearchResponse {
  repeated Result results = 1;
}

message Result {
  string url = 1;
  string title = 2;
  repeated string snippets = 3;
}

(Source: https://developers.google.com/protocol-buffers/docs/proto3#other)