×
Namespaces

Variants
Actions
Revision as of 15:40, 14 September 2010 by mahbub_s60 (Talk | contribs)

How to use different positioning methods in S60

From Nokia Developer Wiki
Jump to: navigation, search

Contents

Introduction

There are different kind of positioning methods available in Symbian platform. This article briefly describes those and how to use each method from Symbian C++ code.


Description

Four different methods are availabel in Symbian platform. Each having different response time, accuraccy and so on. Each location acuisation method is idetified with Uid and technology type. To use any of the method, we have to creates a session with the positioning server and then we create a sub-session with the positioning server. When we create sub-session we can instruct what positioning mechanism we are going to use. If we don't provide any specific positioning method then The server uses the positioning module with the highest priority by default. If the highest priority positioning module is not available or if it returns an error for a position request then the positioning module with the next highest priority is used. Following table describes different modules, name and it's Uid.


Technology Name Used Uid
Network based 0x10206915
Assisted GPS 0x101fe98c
Integrated GPS 0x101fe98a
Bluetooth GPS 0x101fe999

Detecting numbers of available modules

Following code try to find the number of modules and identify the desired module id (set by UI) that is going to be used for positioning. In this example we use the position information to download map.

    TUint module = 0;        
// Get the available numbers of modules
error = iPosServer.GetNumModules(module);
if(error != KErrNone)
{
iPosServer.Close();
return;
}
TPositionModuleInfo info;
 
for(TUint i = 0; i < module; i++)
{
error = iPosServer.GetModuleInfoByIndex(i,info);
TBool isavailable = info.IsAvailable();
if(error == KErrNone && isavailable)
{
TBuf<200> buf(0);
buf.SetLength(0);
buf.FillZ();
info.GetModuleName(buf);
 
if(!buf.Compare(_L("Network based")) && iELocModuleUsed == eNetwork)
{
iTargetModule = info.ModuleId();
break;
}
 
if(!buf.Compare(_L("Integrated GPS")) && iELocModuleUsed == eGPS)
{
iTargetModule = info.ModuleId();
break;
}
 
if(!buf.Compare(_L("Assisted GPS")) && iELocModuleUsed == eAssisted)
{
iTargetModule = info.ModuleId();
break;
}
 
if(info.TechnologyType()& TPositionModuleInfo::ETechnologyTerminal)
{
TPositionModuleInfo::TDeviceLocation deviceLoc = info.DeviceLocation();
if (deviceLoc == TPositionModuleInfo::EDeviceInternal)
{
//Checked GPS is available, you can use the information to your app
}
}
}
else
{
//Checked GPS is available, you can use the information to your app
}
}

Using the desired module

Following code shows how to use the desired module to find location. If the desired target type is set that module id can be used to open a sub-session.

    // Open subsession to the position server if it was targetted as Network based
if(iELocModuleUsed == eNetwork || iELocModuleUsed == eGPS || iELocModuleUsed == eAssisted)
{
if(iTargetModule != TUid::Null())
{
error = iPositioner.Open(iPosServer, iTargetModule);
}
else
{
// Open subsession to the position server if it was targetted as default
error = iPositioner.Open(iPosServer);
}
}
else
{
// Open subsession to the position server if it was targetted as default
error = iPositioner.Open(iPosServer);
}

How to detect if a device support specific technology type

A device can support several technology type, that can be detected by program. Each technology can be enabled/disable in the positioning settings of the devices. ETechnologyTerminal means the device has integrated GPS. ETechnologyNetwork means positioning technology is network based and so on. More information in LbsCommon.h in SDK.

                if(info.TechnologyType()& TPositionModuleInfo::ETechnologyTerminal)
{
TPositionModuleInfo::TDeviceLocation deviceLoc = info.DeviceLocation();
if (deviceLoc == TPositionModuleInfo::EDeviceInternal)
{
//Checked GPS is available, you can use the information to your app
}

Required Capability and Example

Several capabilities are required File:Locationmethod.zip

97 page views in the last 30 days.

Was this page helpful?

Your feedback about this content is important. Let us know what you think.

 

Thank you!

We appreciate your feedback.

×