in_addr structure

The in_addr structure represents an IPv4 address.

Note The IPaddr type definition in IP Helper also represents an IPv4 address and can be cast to an interchangeable in_addr structure when needed. The in_addr structure in IP Helper has the same syntax and usage as the Windows Sockets in_addr structure, and is interchangeable with in_addr structure used in Windows sockets. Windows sockets also defines an IN_ADDR typedef for the in_addr structure.

Syntax

C++


typedef struct {
  union {
    struct {
      u_char s_b1,s_b2,s_b3,s_b4;
    } S_un_b;
    struct {
      u_short s_w1,s_w2;
    } S_un_w;
    u_long S_addr;
  } S_un;
} IPAddr;

Members

S_un

S_un_b: The IPv4 address of the host formatted as four u_chars.
S_un_w: The IPv4 address of the host formatted as two u_shorts.
S_addr: Address of the host formatted as a u_long.

Remarks

The IPaddr type definition also represents an IPv4 address and can be cast to an in_addr structure when needed.

On the Microsoft Windows Software Development Kit (SDK) released for Windows Vista and later, the organization of header files has changed and the in_addr structure is defined in the Inaddr.h header file which is automatically included by the Ipexport.h header file. On the Platform Software Development Kit (SDK) released for Windows Server 2003 and Windows XP, the in_addr structure is declared in the Ipexport.h header file.

Requirements

Minimum supported client	Windows 2000 Professional [desktop apps only]
Minimum supported server	Windows 2000 Server [desktop apps only]
Header	Inaddr.h on Windows Server 2008 and Windows Vista (include Ipexport.h); Ipexport.h on Windows Server 2003, Windows XP and Windows 2000

in_addr structure

Syntax

Members

Remarks

Requirements

See also