如何在Swift中附加协议缓冲区？

概述我有一个 protobuf v2 in Swift,我试图附加到另一个原型.这是我正在尝试的： let attachment = getAttachment(id: 987) //From cloud databasevar protosData = NSMutableData(data: attachment)items.forEach { //Some struct array of v 我有一个 protobuf v2 in Swift,我试图附加到另一个原型.这是我正在尝试的：

let attachment = getAttachment(ID: 987) //From cloud databasevar protosData = NSMutableData(data: attachment)items.forEach { //Some struct array of values  guard let proto = try? MyProtoBuf.Builder()      .setEpochMillis(
malloc: *** mach_vm_map(size=2749415424) Failed (error code=3)*** error: can't allocate region*** set a breakpoint in malloc_error_break to deBUG
.date.epochMilliseconds)      .setValue(
extension GeneratedMessageProtocol {  static func getStreamData(data: NSData) -> [Self] {    var messages = [Self]()    do {        let inStream = NSinputStream(data:data)        inStream.open()        defer { inStream.close() }        while inStream.hasBytesAvailable {            var sizeBuffer: [UInt8] = [0,0]            inStream.read(&sizeBuffer,maxLength: sizeBuffer.count)            let data = NSData(bytes: sizeBuffer,length: sizeBuffer.count)            let messageSize = data.uint32.littleEndian            var buffer = Array<UInt8>(count: Int(messageSize),repeatedValue: 0)            inStream.read(&buffer,maxLength: Int(messageSize))            let messageData = NSData(bytes: buffer,length:Int(messageSize))            messages.append(try self.parseFromData(messageData))        }    }    catch {    }    return messages  }}extension NSData {  var uint32: UInt32 {    get {        var number: UInt32 = 0        self.getBytes(&number,length: sizeof(UInt32))        return number    }  }}
.value)      .build() else { return }  protosData.appendData(proto.data())}saveAttachment(protosData) //Store to cloud

看来我正在破坏数据,因为我读回来时会收到这个错误：

Syntax = "proto2";message MyProtoBuf {    optional uint64 epochMillis = 1;    optional uint32 value = 2;}

也许是我的回读值是不正确的,这是我正在做的从存储读取附加数据：

let attachment = getAttachment(ID: 987)         //From cloud databasevar arr: [UInt32] = [UInt32(attachment.length)] //Assuming attachment is NSData typelet delimiter = NSData(bytes: arr,length: arr.count * sizeof(UInt32))let protosData = NSMutableData(data: delimiter)protosData.appendData(attachment)items.forEach {                                 //Some struct array of values  guard let proto = try? MyProtoBuf.Builder()      .setEpochMillis(.date.epochMilliseconds)      .setValue(.value)      .build() else { return }  var array: [UInt32] = [UInt32(proto.data().length)]  let delimit = NSData(bytes: array,length: arr.count * sizeof(UInt32))  protosData.appendData(delimit)  protosData.appendData(proto.data())}saveAttachment(protosData)                      //Store to cloud

这里是我的protobuf信息：

将数据附加到现有protobuf的正确方法是什么,而不是逐个解析数组项,附加原型,然后将整个数组转换回字节？

你的阅读部分没问题.在链接原始对象时,您将缺少分隔符.首先计算并添加分隔符到流,然后再添加原始对象.然后为每个原型对象做. 总结

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