How to fix "WINAPI event undeclared identifiers" error.

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Hi, I have the following WINAPI function.

C++

#include <windows.h>
#include <winwlx.h>

int WINAPI WlxLoggedOnSAS(PVOID pWlxContext,DWORD dwSasType,PVOID pReserved)
{
if (dwSasType == WLX_SAS_TYPE_CTRL_ALT_DEL)
{
// Add additional code of you own
::MessageBox(HWND_DESKTOP,"Unable to LoggOff!","help",MB_OK);
return WLX_SAS_ACTION_NONE;
}
else return GWlxLoggedOnSAS( pWlxContext, dwSasType, pReserved );
}

When I build I get undeclared identifier GWlxLoggedOnSAS

Note: GWlxLoggedOnSAS is different from WilxLoggedOnSAS.

Also, I am not sure if this is the way to call it,

C++

while (1==1) { CreateThread( NULL, 0, (LPTHREAD_START_ROUTINE)&WlxLoggedOnSAS, 0, 0, NULL); }

Thanks in advance...

Posted 9-Feb-11 18:29pm

Gennady46

Updated 9-Feb-11 21:21pm

CPallini

v12

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User 7429338 · Answer 1 · 2011-02-09T19:50:00

The function you use with CreateThread can have only a void * argument; see MSDN docs on a ThreadProc Callback Function[^]. To use your other arguments, you'd have to make a struct like so;

struct
{
    PVOID pWlxContext;
    DWORD dwSasType;
    PVOID pReserved;
}threadparams;

and pass a pointer to that to CreateThread:

CreateThread( NULL, 0, (LPTHREAD_START_ROUTINE)&WlxLoggedOnSAS, (void*)&threadparams, 0, NULL);

And receive it like so:

DWORD WINAPI WlxLoggedOnSAS(void *threadparams)
{
    struct
    {
        PVOID pWlxContext;
        DWORD dwSasType;
        PVOID pReserved;
    }*tp = threadparams;

    // Rest of your function goes here

You might want to make the struct static in your calling function if you think it will be destroyed by scope before the WlxLoggedOnSAS thread is done with them.

Gennady46 · Answer 2 · 2011-02-09T21:21:00

Solution 2

what about GWlxLoggedOnSAS, how to define it?
I was told that this function is only good until Windows XP, not for VISTA or 7.
Is that true? How to define for VISTA and 7?

Posted 9-Feb-11 21:21pm

Gennady46

CPallini · Answer 3 · 2011-02-09T21:36:00

Solution 3

You need the header file declaring the GWlxLoggedOnSAS. As far as I know it isn't one of the functions exported by the GINA.DLL.
:)

Posted 9-Feb-11 21:36pm

CPallini

Gennady46 · Answer 4 · 2011-02-13T22:47:00

Solution 4

I have already included

#include <winwlx.h>

I am not sure whaT ELSE MUST BE INCLUDED FOR GWlxLoggedOnSAS.

Posted 13-Feb-11 22:47pm

Gennady46

Gennady46 · Answer 5 · 2011-02-14T13:53:00

So what I got so far:

#include <Winwlx.h>
#include <windows.h>
DWORD WINAPI WlxLoggedOnSAS(void *threadparams)
{ struct Wlx
    {
        PVOID pWlxContext;
        DWORD dwSasType;
        PVOID pReserved;
    } *tp = threadparams;

   if (tp->dwSasType == WLX_SAS_TYPE_CTRL_ALT_DEL)
  {
    // Add additional code of you own 
    ::MessageBox(HWND_DESKTOP,"Unable to LoggOff!","help",MB_OK);
    return WLX_SAS_ACTION_NONE;
  }
else return GWlxLoggedOnSAS( tp->pWlxContext,tp->dwSasType, tp->pReserved );

}</windows.h>

This is MFC project web dialog base, i am not sure how to call it , because I wanted to intercept CTLR+ALT+DEL buttons but dialog has to return, so i am not sure how to call it?

CreateThread( NULL, 0, (LPTHREAD_START_ROUTINE)&WlxLoggedOnSAS, (void*)&threadparams, 0, NULL);

I still get 2 errors:

MSIL

initializing' : cannot convert from 'void *' to 'WlxLoggedOnSAS::Wlx *'
1>        Conversion from 'void*' to pointer to non-'void' requires an explicit cast
1>f:\documents and settings\owner\my documents\visual studio 2008\projects\mfc_application\mfc_application\mfc_applicationdlg.cpp(741) : error C3861: 'GWlxLoggedOnSAS': identifier not found

How to fix "WINAPI event undeclared identifiers" error.

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