32 bi NetBIOS() caused RTC checks to complain under 64 bit Win2003

[Guest Sten Westerback \(MVP SDK 2005-6 :\)]

Hi

 

The below routine works just fine on 32 bit Windows 2000, XP and Server

2003.

 

But under WOW32 on a 2003 64 bit system the debug code (compiled with

runtime checks) fails claiming that

"Run-Time Check Failure #2 - Stack around the variable 'ncbO' was

corrupted."

Release version without the check seems to work ok but i want to debug. I'm

using MSVC 2003 7.1.6030 and don't currently have time to convert the code

to 64 bit.

 

Here is the routine which purpose is to simulate use of "NBTSTAT -a

computername" to check if a workstation is online. Netbios is after all

considerably more reliable than ping.

 

BOOL CheckOnline(char *p_szComputername)

{

NCB ncbO;

int i;

UCHAR uc;

char sz[50];

struct

{

ADAPTER_STATUS as;

NAME_BUFFER nb[20];

} X;

 

if (p_szComputername==NULL) return FALSE;

if ((i=strlen(p_szComputername))<2) return FALSE;

if (i>16) return FALSE;

memset(&ncbO, 0, sizeof(NCB));

ncbO.ncb_buffer = &X; memset(&X, 0, sizeof(X));

ncbO.ncb_length=sizeof(X);

ncbO.ncb_lana_num = iBestLANadapter();

ncbO.ncb_command = NCBRESET; Netbios(&ncbO);

ncbO.ncb_command = NCBASTAT;

memcpy(ncbO.ncb_name, "IMIPserver ", 16);

memcpy(sz, p_szComputername, i); sz=0; strupr(sz);

memset(ncbO.ncb_callname, ' ', 16); memcpy(ncbO.ncb_callname, sz, i);

uc=Netbios(&ncbO);

if (uc==NRC_CMDTMO) { Sleep(1000); ncbO.ncb_length=sizeof(X);

uc=Netbios(&ncbO); }

if (uc!=NRC_GOODRET && uc!=NRC_INCOMP) return FALSE;

if (uc==NRC_INCOMP) { return FALSE; /* Need to issue second command ? */ }

return TRUE;

}

 

Can it be possible that the WOW32 has a bug making it update the structures

with data in 64 bit format? But even so i would think that huge buffer

should be big enough and i have also tried to add extra buffers around it.

Maybe it's just the runtime check routine that gets confused somehow. Help!

 

Also, can someone tell how one is supposed to handle NRC_INCOMP ? And is the

NCBRESET step always required?

 

- Sten