swift-protobuf is a Swift Package, so you can add it with Xcode.
As an example BookInfo.proto, write the data definition in a file.
A sample is listed on the project page, so let's copy it.
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syntax = "proto3";
message BookInfo {
int64 id = 1;
string title = 2;
string author = 3;
}
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Next, let 's create a Swift file from BookInfo.proto.
A tool to create Swift files can be installed via Homebrew.
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brew install swift-protobuf
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To generate a Swift file with the following command.
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protoc --swift_out=. BookInfo.proto
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The generated result is here.
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// DO NOT EDIT.
// swift-format-ignore-file
//
// Generated by the Swift generator plugin for the protocol buffer compiler.
// Source: BookInfo.proto
//
// For information on using the generated types, please see the documentation:
// https://github.com/apple/swift-protobuf/
import Foundation
import SwiftProtobuf
// If the compiler emits an error on this type, it is because this file
// was generated by a version of the `protoc` Swift plug-in that is
// incompatible with the version of SwiftProtobuf to which you are linking.
// Please ensure that you are building against the same version of the API
// that was used to generate this file.
fileprivate struct _GeneratedWithProtocGenSwiftVersion: SwiftProtobuf.ProtobufAPIVersionCheck {
struct _2: SwiftProtobuf.ProtobufAPIVersion_2 {}
typealias Version = _2
}
struct BookInfo {
// SwiftProtobuf.Message conformance is added in an extension below. See the
// `Message` and `Message+*Additions` files in the SwiftProtobuf library for
// methods supported on all messages.
var id: Int64 = 0
var title: String = String()
var author: String = String()
var unknownFields = SwiftProtobuf.UnknownStorage()
init() {}
}
// MARK: - Code below here is support for the SwiftProtobuf runtime.
extension BookInfo: SwiftProtobuf.Message, SwiftProtobuf._MessageImplementationBase, SwiftProtobuf._ProtoNameProviding {
static let protoMessageName: String = "BookInfo"
static let _protobuf_nameMap: SwiftProtobuf._NameMap = [
1: .same(proto: "id"),
2: .same(proto: "title"),
3: .same(proto: "author"),
]
mutating func decodeMessage<D: SwiftProtobuf.Decoder>(decoder: inout D) throws {
while let fieldNumber = try decoder.nextFieldNumber() {
// The use of inline closures is to circumvent an issue where the compiler
// allocates stack space for every case branch when no optimizations are
// enabled. https://github.com/apple/swift-protobuf/issues/1034
switch fieldNumber {
case 1: try { try decoder.decodeSingularInt64Field(value: &self.id) }()
case 2: try { try decoder.decodeSingularStringField(value: &self.title) }()
case 3: try { try decoder.decodeSingularStringField(value: &self.author) }()
default: break
}
}
}
func traverse<V: SwiftProtobuf.Visitor>(visitor: inout V) throws {
if self.id != 0 {
try visitor.visitSingularInt64Field(value: self.id, fieldNumber: 1)
}
if !self.title.isEmpty {
try visitor.visitSingularStringField(value: self.title, fieldNumber: 2)
}
if !self.author.isEmpty {
try visitor.visitSingularStringField(value: self.author, fieldNumber: 3)
}
try unknownFields.traverse(visitor: &visitor)
}
static func ==(lhs: BookInfo, rhs: BookInfo) -> Bool {
if lhs.id != rhs.id {return false}
if lhs.title != rhs.title {return false}
if lhs.author != rhs.author {return false}
if lhs.unknownFields != rhs.unknownFields {return false}
return true
}
}
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The code in following:
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var unknownFields = SwiftProtobuf.UnknownStorage()
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More details on this are below:
Now let's pass this data to C# (such as Azure Functions) and exchange it.