golang

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I've tried to identify a struct with string value(name). reflect.TypeOf returns Type . But type assertion needs a type . How can I casting Type to type ? Or any suggestion to handle it? http://play.golang.org/p/3PJG3YxIyf package main import ( "fmt" "reflect" ) type Article struct { Id int64 `json:"id"` Title string `json:"title",sql:"size:255"` Content string `json:"content"` } func IdentifyItemType(name string) interface{} { var item interface{} switch name { default: item = Article{} } return item } func main() { i := IdentifyItemType(

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: The Go documentation ( http://golang.org/pkg/flag/ ) says: The FlagSet type allows one to define independent sets of flags, such as to implement subcommands in a command-line interface. I need this functionality but I can't figure out how to persuade the flag pkg to do it. When I define two FlagSets, parsing one of them will give me errors and warnings if the commandline has flags that are meant for the second one. Example: f1 := flag . NewFlagSet ( "f1" , flag . ContinueOnError ) apply := f1 . Bool ( "apply" , false , "" ) silent

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: func main(){ var array [10]int sliceA := array[0:5] append(sliceA, 4) fmt.Println(sliceA) } Error : append(sliceA, 4) evaluated but not used I don't Know why? The slice append operation is not run... 回答1: Refer: Appending to and copying slices In Go, arguments are passed by value. Typical append usage is: a = append(a, x) You need to write: func main(){ var array [10]int sliceA := array[0:5] // append(sliceA, 4) // discard sliceA = append(sliceA, 4) // keep fmt.Println(sliceA) } Output : [0 0 0 0 0 4] I hope it helps. 回答2: sliceA =append

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: package demo type People struct{ Name string Age uint } type UserInfo struct{ Address string Hobby []string NickNage string } another file: import demo in this file ,how to get all struct in demo pkg? 回答1: Go retains no master list of structs, interfaces, or variables at the package level, so what you ask is unfortunately impossible. 回答2: Drat, I was hoping that Jsor's answer was wrong, but I can't find any way to do it. All is not lost though: If you have the source to 'demo', you could use the parser package to fish out the information you

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: One layout template with three children templates. layout.html {{template "tags"}} {{template "content"}} {{template "comment"}} tags.html {{define "tags"}} {{.Name}} {{end}} content.html {{define "content"}} {{.Title}} {{.Content}} {{end}} comment.html {{define "tags"}} {{.Note}} {{end}} gocode type Tags struct { Id int Name string } type Content struct { Id int Title string Content string } type Comment struct { Id int Note string } func main() { tags := &Tags{"Id":1, "Name":"golang"} Content := &Content{"Id":9, "Title":"Hello", "Content":

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am trying to run a shell command, capture stdout and write that output to a file. However, I seem to be missing a few steps, as the file I am trying to write is empty when the program exists. How can I capture the stdout of the command and write that to a file? package main import ( "bufio" "io" "os" "os/exec" ) func main() { cmd := exec.Command("echo", "'WHAT THE HECK IS UP'") // open the out file for writing outfile, err := os.Create("./out.txt") if err != nil { panic(err) } defer outfile.Close() stdoutPipe, err := cmd.StdoutPipe() if

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I would like to compile to arm on osx. With the following command: GOOS=linux GOARCH=arm CGO_ENABLED=1 go build -o foo main.go But I get: runtime/cgo clang: error: argument unused during compilation: '-mno-thumb' I use this package: https://github.com/mattn/go-sqlite3 I tried the hints: https://github.com/mattn/go-sqlite3/issues/106 Thanks for every help :-) 回答1: The result, I compiled it on the arm device (raspberrypi). 文章来源: golang: CGO / clang with sqlite3.c

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Is there function similar to getchar able to handle tab press in console? I want to make some sort of completion in my console app. 回答1: C's getchar() example: #include void main() { char ch; ch = getchar(); printf("Input Char Is :%c",ch); } Go equivalent: package main import ( "bufio" "fmt" "os" ) func main() { reader := bufio.NewReader(os.Stdin) input, _ := reader.ReadString('\n') fmt.Printf("Input Char Is : %v", string([]byte(input)[0])) // fmt.Printf("You entered: %v", []byte(input)) } The last commented line just shows that when you

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: golang doc for Package fmt Floating-point and complex constituents says: Floating-point and complex constituents: %b decimalless scientific notation with exponent a power of two, in the manner of strconv.FormatFloat with the 'b' format, e.g. -123456p-78 and my test: fmt . Printf ( "%b\n" , 1.0 ) the result: 4503599627370496p-52 what is it? your guess is mine! so test this: fmt . Printf ( "0b%b\n" , 255 ) //0b11111111 it is ok. so i think this is interesting and informative to share. 回答1: then i did some Research and after many

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am pretty new to GoLang. I have a pretty simple dockerFile that is trying to build a goLang webservice. FROM golang:alpine WORKDIR /app/webservice_refArch ADD . /app/webservice_refArch RUN apk add git RUN apk upgrade RUN cd /app/webservice_refArch/ && go get webservice_refArch/restapi RUN cd /app/webservice_refArch/cmd/reference-w-s-server && go build -o ../../server ENTRYPOINT ./goapp When the build runs it cannot find a local import. go get webservice_refArch/restapi The error that I get is: package webservice_refArch/restapi: