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How to use Google protocol buffer in the go language?
Now the trend is a button to do, as with Ubuntu installation software
Go get code.google.com/p/goprotobuf/{proto,protoc-gen-go}
Go install Code.google.com/p/goprotobuf/proto
Done, can be found under the $GO _path/bin protoc-gen-go This program, then can be practical protoc-gen-go to GO language proto file automatic generation.
go1.0 used: protoc-gen-go--go_out=. Hellowrold.proto
go1.1 Direct Utility The following commands
Protoc--go_out=. Hellowrold.proto
Proto file:
Package LM;
Message HelloWorld
{
Required Int32 id = 1; // ID
Required stringstr = 2; // Str
Optional int32 opt = 3; // Optional Field
}
Package LM; Therefore must be placed in the LM directory (refer to the proto specification), use the command to generate files under LM
Protoc-gen-go--go_out=. Hellowrold.proto
Automatically survived the Helloworld.go file:
// Code generated by protoc-gen-go.
// Source:helloworld.proto
// Do not edit!
Package LM
Import Proto " Code.google.com/p/goprotobuf/proto "
Import JSON " Encoding/json "
Import Math " Math "
// Reference Proto, JSON, and math imports to suppress error if they is not otherwise used.
var_ = Proto. Marshal
var_ = &json. syntaxerror{}
var_ = Math. Inf
Type Helloworld struct{
Id *int32 ' protobuf: " Varint,1,req,name=id "Json: " Id,omitempty "`
STR * string' Protobuf: " Bytes,2,req,name=str "Json: " Str,omitempty "`
Opt *int32 ' protobuf: " varint,3,opt,name=opt "Json: " Opt,omitempty "`
xxx_unrecognized [] byte' JSON: " - "`
}
Func ( This*helloworld) Reset () {* This= helloworld{}}
Func ( This*helloworld) String () string{ returnProto.compacttextstring ( This) }
Func (*helloworld) Protomessage () {}
Func ( This*helloworld) GetId () int32 {
if This! = Nil && This. Id! = Nil {
return* This. Id
}
return 0
}
Func ( This*helloworld) Getstr () string{
if This! = Nil && This. Str! = Nil {
return* This. Str
}
return ""
}
Func ( This*helloworld) GetOpt () int32 {
if This! = Nil && This. Opt! = Nil {
return* This. Opt
}
return 0
}
Func init () {
}
You can see that there are no functions such as set_xx, Serializetoostream in C + + (you can see different methods from the code below).
Writer file:
Package Main
Import Proto " Code.google.com/p/goprotobuf/proto "
Import (
" ./LM "
" FMT "
" OS "
)
Func Main () {
Msg: = &lm. helloworld{
Id:proto. Int32 ( 101),
Str:proto. String ( " Hello "),
} // MSG init
Path: = string( " ./log.txt ")
F, err: = OS. Create (PATH)
ifErr! = Nil {
Fmt. Printf ( " failed:%s\n ", err)
return
}
Defer F.close ()
Buffer, err: = Proto. Marshal (msg) // Serializetoostream
F.write (buffer)
}
Reader file:
Package Main
Import Proto " Code.google.com/p/goprotobuf/proto "
Import (
" ./LM "
" FMT "
" io "
" OS "
)
Func checkerror (err error) {
ifErr! = Nil {
Fmt. Println (Err. Error ())
Os. Exit (- 1)
}
}
Func Main () {
Path: = string( " ./log.txt ")
File, err: = OS. Open (PATH)
ifErr! = Nil {
Fmt. Printf ( " failed:%s\n ", err)
return
}
Defer file. Close ()
FI, Err: = file. Stat ()
CheckError (ERR)
Buffer: = make ([] byte, FI. Size ())
_, err = Io. Readfull (file, buffer) // Read all content
CheckError (ERR)
Msg: = &lm. helloworld{}
Err = Proto. Unmarshal (buffer, msg) // unserialize
CheckError (ERR)
Fmt. Printf ( " read:%s\n ", Msg. String ())
}
