将C ++代码段转换为Golang

Question

I'm trying to covert the following C++ snippet to Golang, but I'm not having any luck getting the syntax correct. Here's what the C++ snippet looks like:

v8::String::Utf8Value reqStringObj(args[1]);
const char *reqString = *reqStringObj;

char hex[3] = {reqString[strlen(reqString) - 2], reqString[strlen(reqString) - 1], '\0'};
unsigned char requestId = (unsigned char)strtoul (hex, 0, 16);
printf("requestId is: %d
", requestId);

Here's what I have so far via the Go version:

reqStr := "somerandomstringthatihave"
hex := []uint8{reqStr[len(reqStr)-2], reqStr[len(reqStr)-1], '\u0027'}

requestId := ?????

I'm not exactly sure how to convert the casted strtoul function noted in the C++ function to make it work in the same way via the Go version. Any ideas?

Answer 1

You can accomplish this rather easily using strconv.ParseUint:

reqStr := "jfd0jifdgfa"
if len(reqStr) <= 1 {
  panic("reqStr not long enough")
}
requestId, err := strconv.ParseUint(reqStr[len(reqStr) - 2:], 16, 64)
if err != nil {
  panic(err)
}

Keep in mind that final two characters of reqStr must be valid hex characters, otherwise the above code will panic.