PPT Slide

// Callback function for enumerating service providers

static BOOL FAR PASCAL DirectPlayEnumerateCallback(

LPGUID lpSPGuid,

LPTSTR lpszSPName,

DWORD dwMajorVersion,

DWORD dwMinorVersion,

LPVOID lpContext

)

{

//Look for the TCP/IP service provider for DirectPlay

if (strstr( lpszSPName, "TCP") != NULL)

{

// Make space for the service provider's GUID.

lpServiceProviderGuid = new GUID;

if (lpServiceProviderGuid == NULL) //If memory could not be allocated

::MessageBox(NULL,"Could not allocate memory for service provider's GUID",

"HelloWorld", MB_OK);

else

*lpServiceProviderGuid = *lpSPGuid; // Store the GUID of the service provider

return(FALSE); //Returning false stops further enumeration

//Since we found our service provider, we return false

}

return(TRUE); //Continue enumeration

}

DirectPlayEnumerateCallback():

DirectPlay calls this function for each

service provider it detects on the machine

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