英文:
Why isn't go embedding files?
问题
我正在尝试将一个文本文件嵌入到我的Go应用程序中，但我无法弄清楚为什么它不起作用。
我在与我的Go程序相同的目录中有一个名为hello.txt的文件，但当我编译和运行下面的代码时，它不会打印任何内容，而实际上它应该打印出hello.txt的内容。
package main
import (
_ "embed"
"fmt"
)
// go:embed hello.txt
var hello string
func main() {
fmt.Println(hello)
}
我还尝试将hello声明为[]byte，甚至使用文件系统并列出所有文件，但两者都显示没有嵌入任何内容。
英文:
I'm trying to embed a text file within my go application, but I can't figure out why it's not working.
I have a file named hello.txt in the same directory as my go program, but when I compile and run the code below it doesn't print anything, when it should print the contents of hello.txt.
package main
import (
_ "embed"
"fmt"
)
// go:embed hello.txt
var hello string
func main() {
fmt.Println(hello)
}
I also tried making hello a []byte and even using a filesystem and listing all files, both show that there's nothing embedded.
答案1
得分: 16
你不能在//和go:embed之间加空格，否则编译器会将其视为注释。
embed文档没有明确说明这一点，但在go编译文档中有解释：
编译器接受以注释形式的指令。为了将其与非指令注释区分开，指令在注释开头和指令名称之间不需要空格。然而，由于它们是注释，对于不了解指令约定或特定指令的工具，可以像处理其他注释一样跳过指令。
英文:
You cannot have a space between the // and the go:embed, otherwise the compiler just treats it as a comment.
The embed documentation doesn't make this clear, but it's explained in the documentation for go compile
> The compiler accepts directives in the form of comments. To distinguish them from non-directive comments, directives require no space between the comment opening and the name of the directive. However, since they are comments, tools unaware of the directive convention or of a particular directive can skip over a directive like any other comment.
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