spot7.org logo
Home PHP C# C++ Android Java Javascript Python IOS SQL HTML Categories
  Home » GO » Page 1
Pulling model directly from Revel template engine
This method of embedding code directly into a template can only be done with interpreted languages such as Ruby and PHP. The Go template packages support some simple instructions (if, else, range etc. - see here for details) but this syntax doesn't come close to a full scripting language - that's probably not intended either. You can call methods such as your to_json method from templates. However

Categories : Go

Why does this piece of Golang code not work?
Print out your split buffer slice, it still contains the null bytes with which it was initialized: http://play.golang.org/p/CW45hPBZ-e buffer := make([]byte, 32) copy(buffer, []byte("TEST")) splited := strings.Split(string(buffer), " ") fmt.Printf("%#v ", splited) Prints: []string{"TESTx00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00"}

Categories : Go

Usage and meaning of &^ and &^= operators in Go
The spec says that they are the bit clear operators: &^ bit clear (AND NOT) integers You would use them as part of a bit flag value. You'd use or to turn on a bit, and and not to turn it off.

Categories : Go

Http Server Read-Write timeouts and Server Side Events
Both ReadTimeout and WriteTimeout define the duration within which the whole request must be read from or written back to the client. These timeouts are applied to the underlying connection (http://golang.org/src/pkg/net/http/server.go?s=15704:15902) and this is before any headers are received, so you cannot set different limits for separate handlers – all connections within the server will shar

Categories : Go

Running GO in IntelliJ IDEA CE 14 stopped working
please use the latest release from Github releases, https://github.com/go-lang-plugin-org/go-lang-idea-plugin/releases and things should work again.

Categories : Go

How to package go project for homebrew
I have refer to termshare.rb and it seems we can simply go get and homebrew will handle anything about GOPATH for us. That's great and I think my problem is solved.

Categories : Go

How to fix 'declared but not used' compiler error in this simple program?
How to fix the compiler message? Remove the outer i from your program: package main import "fmt" func main() { x := [5]float64{1, 2, 3, 4, 5} var total float64 = 0 for i, value := range x { total += value fmt.Println(i, value) } fmt.Println("Average:", total/float64(len(x))) } Surely this fmt.Println(i, value) is using the variable i? Yes, but t

Categories : Go

In go, how do I use a closure with a gorilla/mux subrouter?
The HandlerFunc method on Route expects to be passed a function, as the error message indicates. If instead you have an http.Handler, call Handler instead: subroutes.Methods("GET").Handler(MyHandler(renderer)) Or alternatively, have your MyHandler function return the handler function directly rather than wrapping it as an http.Handler. Which option you choose is going to be a matter of style,

Categories : Go

when to use hijack in golang?
You can see one library (martini) which introduced hijack: issue 45 (Note: I don't recommend Martini, which is not idiomatic, but it is mentioned here only to illustrate hijack) Would it be possible for your responseWriter type to implement http.Hijack? This would allow libraries like this websockets one to work with martini. That issue refers to the following go-nuts thread, where one tri

Categories : Go

Request URL in Golang
The standard net/http package provides a default http client for performing http requests. package main import ( "fmt" "io/ioutil" "net/http" ) func main() { resp, err := http.Get("https://rest.nexmo.com/sms/xml") if err != nil { panic(err) } defer resp.Body.Close() body, err := ioutil.ReadAll(resp.Body) if

Categories : Go

Go: read bytes into array
b is a slice - and you're therefore updating the same underlying array each time you pass it to conn.Read. You can look at this Golang blog post to understand how this works. Once you call fmt.Println(a) .. each slice is looking at the same underlying array. You could fix this by instantiating the buffer b in the loop, or using an array instead of a slice. Here's a working example that re-alloc

Categories : Go

Why are binaries built with gccgo smaller (among other differences?)
The size is different because gc makes static binaries and gccgo links to libgo. This means that the code for the entire runtime (scheduler, garbage collector, maps, channels) is not in the final binary created by gccgo. The speed of compile will of course favor gc. GC was built with speed of compilation in mind. It also generally makes less optimized code and has less work it needs to perform.

Categories : Go

Concisely deep copy a slice?
Not sure which solution is fastest without a benchmark, but an alternative is using the built in copy: cpy := make([]T, len(orig)) copy(cpy, orig) From the documentation: func copy(dst, src []Type) int The copy built-in function copies elements from a source slice into a destination slice. (As a special case, it also will copy bytes from a string to a slice of bytes.) The source an

Categories : Go

Use reflect to set values of struct of struct values
Here's the working program. Explanation below. package main import "fmt" import "strings" import "reflect" type Alias struct { Name string DevicePath string GuiPath string Setpoint string Command string Status string FunctionCmds string } type Manifold struct { Final01 Alias "Final01,/Gaspanel/Shared/Final01,,,wOpen,rIsOpen,"

Categories : Go

Go - map value doesn't update
x point to z while m[0] is a copy of z (it's a map[int]X and not a map[int]*X), so updating x.Y wont update m[0] I'm not sure what you want to do, but here m is a map containing pointers: func main() { m := make(map[int]*X) var x *X if _, ok := m[0]; !ok { z := X{} m[0] = &z x = &z } x.Y = 10 fmt.Println(m[0].Y) fmt.Println(x.Y) }

Categories : Go

GAE datastore, GetMulti() with Projection?
Projection queries don't have to be only on a single entity. You can do exactly this with a projection query. In your case, something like this: q := datastore.NewQuery("EntityKindYouDefinedName").Project("status_property") See the doc for more information on how to process the results of this projection query.

Categories : Go

go - serve contents from a zip file in http
You need to call the handler that you create. Try changing the last line in servezip to http.StripPrefix("/zip/", http.FileServer(zipfs.NewZipFS(&z.Reader))).ServeHTTP(res, req)

Categories : Go

How to implement the file system?
There shouldn't be any need to reimplement these things. Try researching GVFS or KIO, and the related components. They are parts of Gnome and KDE, allowing them to manage remote mounts and resources (also local, apparently). GVFS you can use with gccgo, KIO with Swig.

Categories : Go

Golang net/http request
You seem to want to POST a query, which would be similar to this answer: import ( "bytes" "fmt" "net/http" ) func main() { url := "http://xxx/yyy" fmt.Println("URL:>", url) var query = []byte(`your query`) req, err := http.NewRequest("POST", url, bytes.NewBuffer(query)) req.Header.Set("X-Custom-Header", "myvalue") req.Header.Set("Content-Type", "text/plai

Categories : Go

How to apply separate Mutex on multiple variables in Golang?
You could make different Mutex object for each type instead. Playground type MutexInt struct { sync.Mutex v int } func (i *MutexInt) Get() int { return i.v } func (i *MutexInt) Set(v int) { i.v = v } and use it like this func main() { i := MutexInt{v: 0} i.Lock() i.Set(2) fmt.Println(i.Get()) i.Unlock() }

Categories : Go

Go: multiple keys to single value in map
No, you cannot. The grammar is defined at http://golang.org/ref/spec#Composite_literals and does not include this feature. You will have to specify each key distinctly.

Categories : Go

How to read a file line by line and return how many bytes have been read?
You could consider another approach based on os.File. See ActiveState/tail, which monitor the state of a file, and uses os.File#Seek() to resume tailing a file from within a certain point. See tail.go.

Categories : Go

Go math operations with different results
Since floating point arithmetic is involved, the results for the two expressions will not be the same, even when the input is the same. They may appear to be the same once rounded off to a smaller number of precision positions. The reason one of the outputs shows 17 digits after the decimal, while the remaining show only 1, is probably because you are hitting a boundary condition with the 3.0000.

Categories : Go

Modifying golang Docker Container using the running shell
A better approach would be to install ffmpeg to your golang container by adding a RUN to your Dockerfile, like RUN apt-get update RUN apt-get install -y ffmpeg The words modifying, Docker Container, running shell, kind of contradicts the meaning of Docker.

Categories : Go


Recently Add
How to square all the number in my array? Golang
Pulling model directly from Revel template engine
Why does this piece of Golang code not work?
Usage and meaning of &^ and &^= operators in Go
Http Server Read-Write timeouts and Server Side Events
Running GO in IntelliJ IDEA CE 14 stopped working
How to package go project for homebrew
How to fix 'declared but not used' compiler error in this simple program?
In go, how do I use a closure with a gorilla/mux subrouter?
when to use hijack in golang?
Request URL in Golang
Go: read bytes into array
Why are binaries built with gccgo smaller (among other differences?)
Concisely deep copy a slice?
Use reflect to set values of struct of struct values
Go - map value doesn't update
GAE datastore, GetMulti() with Projection?
go - serve contents from a zip file in http
How to implement the file system?
Golang net/http request
How to apply separate Mutex on multiple variables in Golang?
Go: multiple keys to single value in map
How to read a file line by line and return how many bytes have been read?
Go math operations with different results
Modifying golang Docker Container using the running shell
© Copyright 2017 spot7.org Publishing Limited. All rights reserved.