Namespaces
Variants
Actions
(Difference between revisions)

Getting position data from TPositionInfoBase

Jump to: navigation, search

Revision as of 10:21, 14 May 2009


Article Metadata

Tested with
Devices(s): Nokia 5800 eXpressMusic

Compatibility
Platform(s): S60 3rd Edition
S60 5th Edition

Article
Keywords: TPositionInfoBase, TPosition
Created: (06 May 2009)
Last edited: seppo_fn (14 May 2009)

Overview

Snippet shows how to use TPositionInfoBase:

  • how to get TPosition class from TPositionInfoBase
  • how to show TPosition in textual format


Note: Location capability belongs into self-signing capabilities on S60 3.2 and newer platforms.


MMP file

The following libraries and capabilities are required:

CAPABILITY     Location
LIBRARY lbs.lib


Header

#include <LbsPositionInfo.h> 
#include <LbsPosition.h>
 
// Degrees sign delimeter used in formatting methods
_LIT(KDelimDegree,"\xb0"); // "°" symbol
 
// Dot delimeter used in formatting methods
_LIT(KDelimDot,"\x2e"); // "." symbol
 
// Plus sign delimeter used in formatting methods
_LIT(KDelimPlus,"\x2b"); // "+" symbol
 
// Minus sign delimeter used in formatting methods
_LIT(KDelimMinus,"\x2d"); // "-" symbol
 
// Quotation sign delimeter used in formatting methods
_LIT(KDelimQuot,"\x22"); // "\"" symbol
 
// Apostrophe sign delimeter used in formatting methods
_LIT(KApostrophe,"\x27"); // "'" symbol
 
const TInt KDegreeLength = 19;


Source

void CMyClass::PositionUpdated(TPositionInfoBase& aPosInfo)
{
// Check if position information class type is TPositionInfo
if (aPosInfo.PositionClassType() & EPositionInfoClass)
{
// Cast the TPositionInfoBase object to TPositionInfo
TPositionInfo* posInfo = static_cast<TPositionInfo*>(&aPosInfo);
 
// Get position
TPosition position;
posInfo->GetPosition(position);
 
// Convert positions to the descriptors
TBuf<KDegreeLength> latitudeDegr;
GetDegreesString(position.Latitude(), latitudeDegr);
 
// Convert positions to the descriptors
TBuf<KDegreeLength> longitudeDegr;
GetDegreesString(position.Longitude(), longitudeDegr);
}
}


void CMyClass::GetDegreesString(
const TReal64& aDegrees,TBuf<KDegreeLength>& aDegreesString) const
{
const TReal KSecondsInMinute = 60.0;
const TInt KNumWidth = 3;
 
// If the aDegree is a proper number
if ( !Math::IsNaN(aDegrees) )
{
// Integer part of the degrees
TInt intDegrees = static_cast<TInt>(aDegrees);
 
// Positive float of the degrees
TReal64 realDegrees = aDegrees;
 
// Convert to positive values
if ( intDegrees < 0 )
{
intDegrees = -intDegrees;
realDegrees = -realDegrees;
}
 
// Minutes
TReal64 realMinutes = (realDegrees - intDegrees) * KSecondsInMinute;
 
// Integer part of the minutes
TInt intMinutes = static_cast<TInt>(realMinutes);
 
// Seconds
TReal64 realSeconds = (realMinutes - intMinutes) * KSecondsInMinute;
TInt intSeconds = static_cast<TInt>((realMinutes - intMinutes) * KSecondsInMinute);
 
// Check the sign of the result
if ( aDegrees >= 0 )
{
aDegreesString.Append(KDelimPlus);
}
else
{
aDegreesString.Append(KDelimMinus);
}
 
// Add the degrees
TInt64 value = intDegrees;
aDegreesString.AppendNum(value);
 
// Add the separator
aDegreesString.Append(KDelimDegree);
 
// Add the minutes
value = intMinutes;
aDegreesString.AppendNum(value);
 
// Add the separator
aDegreesString.Append(KApostrophe);
 
// Add the seconds
value = intSeconds;
aDegreesString.AppendNum(value);
 
// Add the separator
aDegreesString.Append(KDelimQuot);
 
// Add the separator
aDegreesString.Append(KDelimDot);
 
// Get six last digits
realSeconds -= intSeconds;
realSeconds *= 1000;
 
// Add the seconds
aDegreesString.AppendNumFixedWidth(static_cast<TInt>(realSeconds),
EDecimal, KNumWidth);
}
}


Postconditions

Position data readed from TPositionInfoBase


See also

220 page views in the last 30 days.
Nokia Developer aims to help you create apps and publish them so you can connect with users around the world.

京ICP备05048969号  © Copyright Nokia 2013 All rights reserved