Motorola SYMBOL MINISCAN MSXX04 Guía de usuario descargar pdf (Pagina 216)

Chapter 19: Wireless Wide-Area Networking

Initializing the WWAN Driver

Psion Mobile Devices Developers Guide

204

This example shows how to initialize WWAN without setting the indications listener.

// Wait for it to become ready:

// Create and register the listener object to receive events

WWANReadyStateListener* myReadyStateListener = new WWANReadyStateListener();

WirelessWAN::SetIndicationsListener(myReadyStateListener);

WirelessWAN::SetIndicationsState(true);

// To prevent a race condition, check to see if the event occured between the

// time last check for the WWAN ready state and registration for the event.

retVal = WirelessWAN::GetReadyState(params, &wwanReadyStatePtr); // Try again.

if( retVal != WwanRequestSuccess ||

params.resultCode != WwanResultSuccess ||

wwanReadyStatePtr == 0)

{

// Unable to get the ready state. See return value/result code for reason.

// Remove indication registration and cleanup objects.

WirelessWAN::SetIndicationsListener(NULL);

WirelessWAN::SetIndicationsState(false);

delete myReadyStateListener;

return false;

}

// Check the ready state flag

readyState = wwanReadyStatePtr->State;

free(wwanReadyStatePtr); // Memory was allocated by "GetReadyState(...)"

if ((readyState & WWAN_READY_STATE_INITIALIZED) != 0 )

{

// Already in the ready state.

// Remove indication registration and cleanup objects

WirelessWAN::SetIndicationsListener(NULL);

WirelessWAN::SetIndicationsState(false);

delete myReadyStateListener;

return true;

}

// Wait up to 30 seconds for the listener object to signal ready.

const int thirtySeconds = 30000;

DWORD eventWait =

WaitForSingleObject(myReadyStateListener->GetWwanReadyEvent(),

thirtySeconds);

// Remove indication registration and cleanup objects

WirelessWAN::SetIndicationsListener(NULL);

WirelessWAN::SetIndicationsState(false);

delete myReadyStateListener;

if (eventWait == WAIT_TIMEOUT)

{

// Ready event not received within 30 seconds;

return false;

}

// The ready event was received.

return true;

}

private bool InitWWANandWait()

{

WWanRequestParameters wwanParameters = new WWanRequestParameters();

WWAN_READY_STATE wwanReadyStatePtr = new WWAN_READY_STATE();

WwanRequestStatus retVal = WirelessWAN.GetReadyState(wwanParameters,

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