英文:
How to send a slice to a function in Go?
问题
我正在将一些C代码改写成Go代码。在我的C代码中，有这样的内容：
static void sharedb(unsigned char *sharedkey, unsigned char *send,
const unsigned char *received) {
unsigned char krq[96];
unsigned char buf[64];
// 其余部分省略
indcpa_enc(send, buf, received, krq + 32);
}
其中indcpa_enc函数定义如下：
static void indcpa_enc(unsigned char *c,
const unsigned char *m,
const unsigned char *pk,
const unsigned char *coins)
所以，在我的Go代码中，我使用了byte数组来代替char数组。我有类似这样的代码：
func SharedB(sharedKey, send, received []byte) {
var krq [96]byte
var buf [64]byte
// 其余部分省略
INDCPAEnc(send[:], buf[:SharedKeyBytes], received[:], krq[32:32+CoinBytes])
}
其中INDCPAEnc函数定义如下：
func INDCPAEnc(c []byte, m [SharedKeyBytes]byte, pk []byte, coins [CoinBytes]byte)
不过，在Go中，这个函数调用给我返回了一个数组，导致类型不匹配。我应该如何将上述的C代码转换为正确的Go代码？此外，我在Go函数参数中是否应该使用指针符号*，就像在C中一样？
英文:
I'm rewriting some C code in Go. And in my C code I have stuff like this:
static void sharedb(unsigned char *sharedkey, unsigned char *send,
const unsigned char *received) {
unsigned char krq[96];
unsigned char buf[64];
// rest removed for brevity
indcpa_enc(send, buf, received, krq + 32);
}
Where indcpa_enc function is defined like this:
static void indcpa_enc(unsigned char *c,
const unsigned char *m,
const unsigned char *pk,
const unsigned char *coins)
So, in my Go code instead of using char arrays I used byte arrays. Where I have something like this:
func SharedB(sharedKey, send, received []byte) {
var krq [96]byte
var buf [64]byte
// rest removed for brevity
INDCPAEnc(send[:], buf[:SharedKeyBytes], received[:], krq[32:32+CoinBytes])
}
Where INDCPAEnc function is defined like this:
func INDCPAEnc(c []byte, m [SharedKeyBytes]byte, pk []byte, coins [CoinBytes]byte)
Though, this function call in Go gives me an array, regarding type mismatch. How can I convert a C code like above to a proper Go code? Also, should I use the pointer notation * for my Go function parameters as in C?
答案1
得分: 7
指定长度的参数（例如[SharedKeyBytes]byte）是数组，而不是切片；因此，您不能传递切片，这就是类型不匹配的错误。您可以选择：
- 将参数类型更改为切片（
[]byte） - 在调用函数之前将切片复制到适当大小的数组中，然后将数组传递给函数而不是切片（playground示例）
英文:
The parameters that specify a length (e.g. [SharedKeyBytes]byte) are arrays, not slices; therefor, you cannot pass a slice, hence the type mismatch error. You can either:
- Change the parameter type to slice (
[]byte) - Copy the slice to an appropriately-sized array prior to calling the function, then pass the array to the function instead of the slice (playground example)
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