英文:
Converting a C++ snippet to Golang
问题
我正在尝试将以下的C++代码片段转换为Golang，但是我无法正确使用语法。这是C++代码片段的样子：
v8::String::Utf8Value reqStringObj(args[1]);
const char *reqString = *reqStringObj;
char hex[3] = {reqString[strlen(reqString) - 2], reqString[strlen(reqString) - 1], '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\n", requestId);
'};
unsigned char requestId = (unsigned char)strtoul(hex, 0, 16);
printf("requestId is: %d\n", requestId);
这是我目前在Golang版本中的代码：
reqStr := "somerandomstringthatihave"
hex := []uint8{reqStr[len(reqStr)-2], reqStr[len(reqStr)-1], '\u0027'}
requestId := ?????
我不确定如何将C++函数中的强制类型转换strtoul转换为Golang版本中的相同方式。有什么想法吗？
英文:
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:
<!-- language: lang-cpp -->
v8::String::Utf8Value reqStringObj(args[1]);
const char *reqString = *reqStringObj;
char hex[3] = {reqString[strlen(reqString) - 2], reqString[strlen(reqString) - 1], '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\n", requestId);
'};
unsigned char requestId = (unsigned char)strtoul (hex, 0, 16);
printf("requestId is: %d\n", requestId);
Here's what I have so far via the Go version:
<!-- language: go -->
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?
答案1
得分: 3
你可以使用strconv.ParseUint来轻松实现这个功能：
reqStr := "jfd0jifdgfa"
if len(reqStr) <= 1 {
panic("reqStr长度不够")
}
requestId, err := strconv.ParseUint(reqStr[len(reqStr) - 2:], 16, 64)
if err != nil {
panic(err)
}
请注意，reqStr的最后两个字符必须是有效的十六进制字符，否则上述代码将会抛出异常。
英文:
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.
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