Get User ID from EVENTLOGRECORD

I think this question is quite straight forward.....but I dun know how to go about it.....my question:

How can I get User ID from EVENTLOGRECORD?  

Example:
If I have a EVENTLOGRECORD pointer that points to a record, how do I print that user ID using that record pointer, to a string?

I think that maybe using UserSidOffset or/and UserSidLength might help.....but I don't know how to.

Any suggestion will be appreciated.
LVL 1
YamSengAsked:
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y96andhaConnect With a Mentor Commented:
You need to use the LookupAccountSid function. Just pass in the pointer to the SID, and you will receive the name of the user and the domain the account was found on.
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YamSengAuthor Commented:
Adjusted points to 20
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YamSengAuthor Commented:
Ho do I get the sid?

pEventLogRecord + pEventLogRecord->UserSidOffset  ?
and pEventLogRecord->UserSidLength ?

Can show me a sample?  
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y96andhaCommented:
20 points is not much.

if(pEventLogRecord->UserSidLength) {
 PSID sp;
 sp = (PSID)(((char *)pEventLogRecord) + pEventLogRecord->UserSidOffset);

 SID_NAME_USE snu;
 DWORD len1,len2;
 int ok;
 TCHAR name[256],dom[256];
 len1=len2=256;
 ok = LookupAccountSid(0,sp,name,&len1,dom,&len2,&snu);
 if(ok) {
   // Success
 } else {
  printf("Error: %d\n",GetLastError());  
 }
}

I have not tested this code, but it should work.
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YamSengAuthor Commented:
sorry about the points, but I a new member and I dun have much points.....

anyway, I've increased the points....
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YamSengAuthor Commented:
If you can help me, I can only offer this much....sorry!
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YamSengAuthor Commented:
I've tried the codes, but found that it gives the user that I do not want.  I want the user name.

If you go to event viewer, you can see that under security log, details for eventID 529 (failed to logon) has 2 "user".  One is "user" the other is "user name"

For example:
If my name is ash and I failed to logon to NT workstation, the event viewer should show

user = system
username = ash

The user name is the value I want to find out.....

thanks!

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y96andhaCommented:
OK, you mean the name in the description box?

This is found in one of the strings, I am not sure which one, and I currently don't have any such entries in my log. You could test it out yourself. The strings are accessed like this:

 TCHAR *p;
 p = (TCHAR *)(((char *)pEventLogRecord) + pEventLogRecord->StringOffset);

 int i;
 for(i=0;i<pEventLogRecord->NumStrings;i++) {
  wprintf(L"String %d : %s\n", i, p);
  p+=_tcslen(p)+1;
 }

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YamSengAuthor Commented:
Thanks!!!  I've got it...

FYI, the user name is in string 0.  
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