IDirectPlayVoiceClient::Initialize Method

Initializes the DirectPlayVoiceClient object by associating it with a Microsoft?DirectPlay?object. Additionally, this method registers a message handler with the DirectPlayVoiceClient object.

Syntax

HRESULT Initialize(      

    LPUNKNOWN pVoid,
    PDVMESSAGEHANDLER pMessageHandler,
    PVOID pUserContext,
    PDWORD pdwMessageMask,
    DWORD dwMessageMaskElements
);

Parameters

pVoid

[in] Pointer to the IUnknown interface for the DirectPlay object that this DirectPlayVoiceClient object should use.

pMessageHandler

[in] User-defined callback function that is called when there is a DirectPlayVoiceClient message to be processed. Threads within the DirectPlayVoiceClient object call the callback function, so it will not be called in the context of your process's main thread.

pUserContext

[in] Pointer to an application-defined structure that is passed to the callback function each time the function is called.

pdwMessageMask

[in] Array of DWORD values that contains the message identifiers that you want DirectPlay Voice to send to your callback function. If a message identifier is not specified in this array, it is not sent. Each message identifier should appear only once in the array and only valid message identifiers are allowed. For example, DVMSGID_CONNECTRESULT is not valid for the server interface, but is for the client interface. To enable all messages, specify NULL for this value.

dwMessageMaskElements

[in] DWORD value specifying the number of elements in the pdwMessageMask parameter. If pdwMessageMask is NULL, this must be 0.

Return Value

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

DVERR_ALREADYINITIALIZED	The object has already been initialized.
DVERR_GENERIC	An undefined error condition occurred.
DVERR_INVALIDPARAM	One or more of the parameters passed to the method are invalid.
DVERR_INVALIDPOINTER	The pointer specified is invalid.
DVERR_NOCALLBACK	This operation cannot be performed because no callback function was specified.
DVERR_TRANSPORTNOTINIT	The specified transport is not yet initialized.

Remarks

This method must be called successfully before IDirectPlayVoiceClient::Connect method is called.

You can call IDirectPlayVoiceClient::SetNotifyMask to change the notify mask during the course of the voice session.