PPT Slide

//Look for a Hello World Session which might be already running

static HRESULT FindSession()

{

HRESULT hr;

DPSESSIONDESC sessionDesc;

ZeroMemory(&sessionDesc, sizeof(DPSESSIONDESC));

sessionDesc.dwSize = sizeof(DPSESSIONDESC);

sessionDesc.guidSession = sessionGUID;

hr = lpDirectPlay1->EnumSessions(&sessionDesc, 1000, EnumSessionsCallback,

hwndApp, DPENUMSESSIONS_AVAILABLE);

if FAILED(hr)

::MessageBox(NULL,"Could not find any HelloWorld sessions", "HelloWorld", MB_OK);

return(hr);

}

// Callback function for enumerating sessions

static BOOL FAR PASCAL EnumSessionsCallback(

LPDPSESSIONDESC lpSessionDesc,

LPVOID lpContext,

LPDWORD lpdwTimeOut,

DWORD dwFlags

)

{

if (dwFlags & DPESC_TIMEDOUT)

::MessageBox(NULL,"Could not find a HelloWorld session!....Timed Out", "HelloWorld", MB_OK);

else

::MessageBox(NULL,"Found a HelloWorld session!", "HelloWorld", MB_OK);

return(FALSE);

}

FindSession():

Enumerates other DirectPlay

sessions with same GUID

EnumSessionsCallback()

is called by DirectPlay for each session it finds.

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