How to convert a zero-terminated byte array to string in Go?

Question

I need to read [100]byte to transfer a bunch of string data.

Because not all of the strings are precisely 100 characters long, the remaining part of the byte array is padded with 0s.

If I convert [100]byte to string by: string(byteArray[:]), the tailing 0s are displayed as ^@^@s.

In C the string will terminate upon 0, so I wonder what's the best way to convert this byte array to string in Golang.

Gopher · Accepted Answer

methods that read data into byte slices return the number of bytes read. You should save that number and then use it to create your string. n being the number of bytes read, your code would look like this: s := string(byteArray[:n]) If for some reason you don't have n, you could use the bytes package to find it, assuming your input doesn't have a null character in it. n := bytes.Index(byteArray, []byte{0}) Or, you can use the code below: n := bytes.IndexByte(byteArray, 0) Trim would help strip out the null bytes. golang.org/pkg/strings/#example_Trim

Chris Gregori · Answer

For example: package main import "fmt" func CToGoString(c []byte) string { n := -1 for i, b := range c { if b == 0 { break } n = i } return string(c[:n+1]) } func main() { c := [100]byte{'a', 'b', 'c'} fmt.Println("C: ", len(c), c[:4]) g := CToGoString(c[:]) fmt.Println("Go:", len(g), g) } https://play.golang.org/p/gQgVRqcSF0V

Go Language

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