一个enum和ntoh的问题 [英] an enum and ntoh question
问题描述
你好
如果我有一个枚举定义
例如
typedef enum {
F0 = 0，
F1 = 1，
F2 = 2，
F3 = 3
} Ftest;
Ftest a;
我需要做ntoh，哪一个使用ntohl或ntohs？
我是否必须将其强制转换为Ftest？
非常感谢！
po *********** @ gmail.com 写道：
你好
如果我有一个枚举定义
typedef enum {
F0 = 0，
F1 = 1，
F2 = 2，
F3 = 3
} Ftest;
Ftest a;
我需要做ntoh，哪一个使用ntohl或ntohs？
我是否必须将它转回Ftest？
你的问题是关于主题，ntoh *（）和hton *（）函数不属于你的部分
of S标准C.
另外，你的问题似乎没有太好框架。
我想你问的可能是什么是`enum`的'type`。好吧，
标准指定它必须适合`int`。现在，查看你的函数声明如何
，你会弄清楚（或不知道）该做什么。
这似乎取决于你的大小`int`。
干杯
弗拉基米尔
-
如果只有我可以得到尊重而不必受到尊重。
po *********** @ gmail.com 写道：
＃Hello
＃
＃如果我有枚举定义
＃例如
＃
＃typedef enum {
＃F0 = 0，
＃F1 = 1，
＃F2 = 2，
＃F3 = 3
＃} Ftest;
＃
#Ftest a;
＃我需要做ntoh，哪一个要使用ntohl或ntohs？
为什么猜？投下它，你不必担心。你用它做什么？
你需要长期或短期结果吗？
＃我必须把它还给Ftest吗？ />
Ftest只是另一个整数。
-
SM瑞恩 http://www.rawbw.com/~wyrmwif/
如果您打算购物，让我们知道。
谢谢
SM Ryan写道：po *********** @ gmail.com 写道：
＃Hello
＃
＃如果我有枚举定义
＃例如
＃
＃typedef enum {
＃F0 = 0，
＃F1 = 1，
＃F2 = 2，
＃F3 = 3
＃} Ftest;
＃
＃Ftest a;
＃我需要做ntoh，哪一个使用ntohl或ntohs？
为什么猜？投下它，你不必担心。你用它做什么？
你需要长期或短期的结果吗？
＃我必须把它还给Ftest吗？
Ftest是只是另一个整数。
不，它不是，它是一种名为`Ftest`的新类型，实际上是一个
`enum`。枚举可以表示为int的事实（因为标准
向我们保证）doe snot意味着enums / are / int。他们是一个完全不同的野兽。
干杯
弗拉基米尔
Hello
If I have an enum definition
for instance
typedef enum {
F0 = 0,
F1 = 1,
F2 = 2,
F3 =3
} Ftest;
Ftest a;
and I need to do ntoh, which one to use ntohl or ntohs?
And do I have to cast it back to Ftest?
Thanks a lot!
po***********@gmail.com wrote:
Hello
If I have an enum definition
for instance
typedef enum {
F0 = 0,
F1 = 1,
F2 = 2,
F3 =3
} Ftest;
Ftest a;
and I need to do ntoh, which one to use ntohl or ntohs?
And do I have to cast it back to Ftest?
Your question is off topic, ntoh*() and hton*() functions not being part
of Standard C.
Also, your question does not seem to be too well framed.
What I think you''re asking may be what''s the `type` of an `enum`. Well,
the Standard specifies that it has to fit in an `int`. Now, look up how
your functions are declared, and you''ll figure out (or not) what to do.
It seems to depend on the size of your `int`.
Cheers
Vladimir
--
If only I could be respected without having to be respectable.
po***********@gmail.com wrote:
# Hello
#
# If I have an enum definition
# for instance
#
# typedef enum {
# F0 = 0,
# F1 = 1,
# F2 = 2,
# F3 =3
# } Ftest;
#
# Ftest a;
# and I need to do ntoh, which one to use ntohl or ntohs?
Why guess? Cast it and you don''t have to worry. What are you using it for?
Do you need a long or short result?
# And do I have to cast it back to Ftest?
Ftest is just another integer.
--
SM Ryan http://www.rawbw.com/~wyrmwif/
If you plan to shoplift, let us know.
Thanks
SM Ryan wrote:po***********@gmail.com wrote:
# Hello
#
# If I have an enum definition
# for instance
#
# typedef enum {
# F0 = 0,
# F1 = 1,
# F2 = 2,
# F3 =3
# } Ftest;
#
# Ftest a;
# and I need to do ntoh, which one to use ntohl or ntohs?
Why guess? Cast it and you don''t have to worry. What are you using it for?
Do you need a long or short result?
# And do I have to cast it back to Ftest?
Ftest is just another integer.
No, it''s not, it''s a new type called `Ftest`, which is actually an
`enum`. The fact that enums can be represented as ints (as the Standard
assures us) doe snot mean that enums /are/ ints. They''re a completely
different beast.
Cheers
Vladimir
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