RTM_IPV4_MASK_FROM_LEN macro (rtmv2.h)

The RTM_IPV4_MASK_FROM_LEN macro converts a generic route length to an IPv4 mask.

Syntax

void RTM_IPV4_MASK_FROM_LEN(
   Len
);

Len

Specifies the generic length to convert.

None

For example, if a client supplies the Len 24, the mask 255.255.255.255 is returned.

The macro is defined as follows:

#include <windows.h>

#define RTM_IPV4_MASK_FROM_LEN(Len)                         \
        ((Len) ? htonl(~0 << (32 - (Len))): 0);             \

Requirement	Value
Minimum supported client	None supported
Minimum supported server	Windows 2000 Server [desktop apps only]
Target Platform	Windows
Header	rtmv2.h