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Chapter 19: Wireless Wide-Area Networking

The DbGprs.csv File

209

Psion Mobile Devices Developers Guide

The following example shows how to connect to the Internet using the Connection Manager:

19.7.2.1 Disconnecting from Connection Manager

On Windows Embedded hand-Held 6.5-based computers, the Connection Manager API,

ConnMgrReleaseConnection, does not fully close the connection. for information on

ConnMgrReleaseConnection see msdn.microsoft.com/en-us/library/bb416503.aspx.

Use RasHangUp to fully close the connection. For information see

msdn.microsoft.com/en-us/library/aa450851.aspx.

Find the connection handle, HRASCONN, using RasEnumConnections. For information see

msdn.microsoft.com/en-us/library/aa918049.aspx

19.7.3 The DbGprs.csv File

To make an Internet connection using either RAS, or the Connection Manager, a username, a password, and

some other related information—such as APN, DNS, MCC, or MNC—may be needed. Psion provides this infor-

mation in the ...\Windows\DbGprs.csv file, on every computer that supports WWAN.

This file is in comma delimited format, so it can be easily read with a text editor or loaded into a spread-

sheet program. When you locate your WWAN service provider in this file, the most common information

types required by the provider are listed.

19.7.4 Checking Packet Data Status

If packet data is enabled for the connection to the WWAN service provider, The WWAN driver automatically

configures the system so that a connection can be made using RAS or Connection Manager.

The following example shows how to check the packet data status:

Note: It is recommended to wait for a Packet Service Status (see Section 19.7.4) of Wwan

AttachStateAttached before attempting a connection through Connection Manager.

// pinvoke region required to access native Connection

// Manager not included here.

const int _syncConnectTimeout = 60000; // 60 seconds

string url = "http://msdn2.microsoft.com";

int ncache = 0;

if (status == ConnMgrStatus.Connected)

ConnMgrReleaseConnection(_connectionHandle, ncache);

Guid networkGuid = Guid.Empty;

ConnMgrMapURL(url, ref networkGuid, 0);

ConnMgrConnectionInfo info =

new ConnMgrConnectionInfo(networkGuid, ConnMgrPriority.UserInteractive);

ConnMgrEstablishConnectionSync(info, ref _connectionHandle, _syncConnectTimeout, ref status);

ConnMgrEstablishConnection(info, ref _connectionHandle);

if (status == ConnMgrStatus.Connected)

{

// Success!

}

WWanRequestParameters opts;

opts.hWaitForAsyncCompletion = 0;

WWAN_PACKET_SERVICE packetService;

if (WirelessWAN::GetPacketService(opts, packetService) == WwanRequestSuccess)

{

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