Hi,
I've just another question, it's Masm related.
I'm trying to access network interface information, like what network devices are presented, which of them are enabled and more.
I use the API GetIfTable returning me a
MIB_IFTABLE struct
dwNumEntries DWORD 0
table MIB_IFROW ANY_SIZE dup(<>)
MIB_IFTABLE ENDS
The entry table is of type MIB_IFROW
MIB_IFROW STRUCT
wszName WORD MAX_INTERFACE_NAME_LEN dup(0)
dwIndex DWORD 0
dwType DWORD 0
dwMtu DWORD 0
dwSpeed DWORD 0
dwPhysAddrLen DWORD 0
bPhysAddr BYTE MAXLEN_PHYSADDR dup(0)
.... abbreviated
dwDescrLen DWORD 0
bDescr BYTE MAXLEN_IFDESCR dup(0)
MIB_IFROW ENDSThe MSDN implements the wszName as unicode (16bits in windows) in the current implementation.
The MSDN says about wszName:
QuotewszName A pointer to a Unicode string that contains the name of the interface
If that's correct shouldn't wszName not be a DWORD? :dazzled:
What's the word on this?
The funny thing is if I check the length of the wszName string with ucLen, I always end up with 0 :red
A pointer is always a DWORD (well on x86 architecture.)
Normally in a string, each character is 8-bits ( 1 byte ) so each character can have 256 different values.
Unicode lets each character have 16-bits (2 bytes) so that each character can 65535 different values.
Your POINTER to the unicode string will still be a dword though the string structure differs.
From lprtrmib.h in the SDK:
typedef struct _MIB_IFROW
{
WCHAR wszName[MAX_INTERFACE_NAME_LEN];
DWORD dwIndex;
DWORD dwType;
DWORD dwMtu;
DWORD dwSpeed;
...
wszName is a Unicode string, not a pointer. WCHAR is defined in the header files as an unsigned short, so for MASM it is a WORD, as it is defined in the MASM32 windows.inc.