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12.1 IP_HDRINCL、SIO_RCVALL没有定义

Q:

编写raw socket程序时需要用到IP_HDRINCL，查阅MSDN后我包含了ws2tcpip.h，编译 时仍报错。

A: scz scz@nsfocus.com

这是一个老问题了，参看:

http://support.microsoft.com/kb/257460

必须在包含winsock2.h之后再包含ws2tcpip.h。类似的情形发生在使用SIO_RCVALL时， 必须在包含winsock2.h之后再包含mstcpip.h。有些人不仔细查看MSDN，就自己定义 了这两个宏，那是不必要的，不推荐这样的编程风格。

/ * For x86/EWindows XP SP1 & VC 7 * cl winsock2_test.c /Fewinsock2_test.exe /nologo /Os /G6 /Gz /Gs65536 /W3 /WX /D "WIN32" /D "NDEBUG" /D "_CONSOLE" /link /RELEASE /

if 0

winsock2_test.exe IP_HDRINCL = 0x00000002 SIO_RCVALL = 0x98000001

endif

include

/ * 必须在包含windows.h之前包含winsock2.h /

include

/ * http://support.microsoft.com/kb/257460 * * ws2tcpip.h must be explicitly included after winsock2.h /

include

/ * mstcpip.h must be explicitly included after winsock2.h /

include

pragma comment( linker, "/INCREMENTAL:NO" )

pragma comment( linker, "/merge:.rdata=.text" )

pragma comment( linker, "/subsystem:console" )

int __cdecl main ( int argc, char * argv[] ) { printf (

    "IP_HDRINCL  = 0x%08X\n"
    "SIO_RCVALL  = 0x%08X\n",
    IP_HDRINCL,
    SIO_RCVALL
);
return( 0 );

} / end of main /