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The Windows Sockets inet_ntoa function converts an (Ipv4) Internet network address into a string in Internet standard dotted format.
char FAR * inet_ntoa (
struct in_addr in
);
Parameters
in
[in] A structure that represents an Internet host address.
Remarks
The inet_ntoa function takes an Internet address structure specified by the in parameter and returns an ASCII string representing the address in “.”” (dot) notation as in “a.b.c.d””. The string returned by inet_ntoa resides in memory that is allocated by Windows Sockets. The application should not make any assumptions about the way in which the memory is allocated. The data is guaranteed to be valid until the next Windows Sockets function call within the same thread, but no longer. Therefore, the data should be copied before another Windows Sockets call is made.
Return Values
If no error occurs, inet_ntoa returns a char pointer to a static buffer containing the text address in standard “.”” notation. Otherwise, it returns NULL.
QuickInfo
Windows NT: Yes
Windows: Yes
Windows CE: Use version 1.0 and later.
Header: Declared in winsock2.h.
Import Library: Link with ws2_32.lib.
See Also
inet_addr
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inet_aton() converts the Internet host address cp from the IPv4 num-
bers-and-dots notation into binary form (in network byte order) and
stores it in the structure that inp points to.
所以inet指internet，a指address（不正规的说法ascii），即”192.168.0.1″这样的字符串格式的地址（人可读）；
n指number/numeric，即0xC0A80001这样数字格式的地址（机器可读）。