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Microsoft DirectX 9.0

IDirectPlayNATHelp::QueryAddress Method


Determine a private alias for a given public address.

Syntax

HRESULT QueryAddress(      

    const SOCKADDR *const pSourceAddress,     const SOCKADDR *const pQueryAddress,     SOCKADDR *const pResponseAddress,     const int iAddressSize,     const DWORD dwFlags );

Parameters

pSourceAddress
[in] Address for the network interface that is using the desired address. This can be set to INADDR_ANY in which case the best server will be used.
pQueryAddress
[in] Address to look up. Do not set this value to INADDR_ANY or INADDR_BROADCAST.
pResponseAddress
[out] Receives the private alias to the public address specified.
iAddressSize
[in] Size of the SOCKADDR structure used for the pSourceAddress, pQueryAddress, and pResponseAddress buffers.
dwFlags
[in] Set to 0 to query for a User Datagram Protocol (UDP) port. Otherwise, set to one of the following values.
DPNHQUERYADRESS_TCP
Query for a TCP port.
DPNHQUERYADRESS_CACHEFOUND
Cache the address if a mapping is found.
DPNHQUERYADRESS_CACHENOTFOUND
Cache the address if a mapping is not found.
DPNHQUERYADRESS_CHECKFORPRIVATEBUTUNMAPPED
Determine if an address is private when no specific mapping is found.

Return Value

Returns DPNH_OK if successful, or one of the following error values.

DPNHERR_GENERIC An error occurred while closing.
DPNHERR_INVALIDFLAGS Invalid flags were specified.
DPNHERR_INVALIDOBJECT The interface object is invalid.
DPNHERR_INVALIDPARAM An invalid parameter was specified.
DPNHERR_INVALIDPOINTER An invalid pointer was specified.
DPNHERR_NOMAPPING The server does not have valid public interfaces.
DPNHERR_NOMAPPINGBUTPRIVATE The server indicated that no mapping was found, but it is a private address.
DPNHERR_NOTINITIALIZED The object has not been initialized.
DPNHERR_OUTOFMEMORY There is not enough memory to perform this operation.
DPNHERR_REENTRANT The interface has been re-entered on the same thread.
DPNHERR_SERVERUNAVAILABLE No servers are currently present.
DPNHERR_UPDATESERVERSTATUSIDirectPlayNATHelp::GetCaps has not been called with the DPNHGETCAPS_UPDATESERVERSTATUS flag set.




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