dp926460 2017-12-29 02:04
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如何使用结构体指针转换[] byte?

I'd like to use Go for low level project and avoid copying data.

I have a struct of fixed size:

type myStruct struct {
    a    uint8
    b    uint8
}

I would like to cast a pointer of my struct with this slice of bytes in order to read the value as if the slice of bytes was a struct without copying anything.

data := []byte{69,0}

var obj *myStruct

//something like:
obj = myStruct(data)
// or
obj = &myStruct(data)

In C it would be: obj = (struct myStruct*) data;

  • Is it possible ? What are the solutions to do so ? The best practice ?

I'd like to void using offset and index for the []byte.

Since a slice is not a fixed memory, I guess it'd be possible by converting []byte into a fixed array byte[0:2].

  • 写回答

1条回答 默认 最新

  • dongnaoben4456 2017-12-29 02:18
    关注

    You can cast unsafe.Pointer to *myStruct passing pointer to the first element of the bytes slice:

    import "unsafe"
    ...
    obj = (*myStruct)(unsafe.Pointer(&data[0]))
    

    test: https://play.golang.org/p/c7XO3dPKcLu

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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