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Getting position data from TPositionInfoBase

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[[Category:Location]][[Category:Symbian C++]]
+
[[Category:Location]][[Category:Symbian C++]][[Category:Code Snippet]]
 
{{ArticleMetaData <!-- v1.2 -->
 
{{ArticleMetaData <!-- v1.2 -->
 
|sourcecode= <!-- Link to example source code (e.g. [[Media:The Code Example ZIP.zip]]) -->
 
|sourcecode= <!-- Link to example source code (e.g. [[Media:The Code Example ZIP.zip]]) -->
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|dependencies= <!-- Any other/external dependencies e.g.: Google Maps Api v1.0 -->
 
|dependencies= <!-- Any other/external dependencies e.g.: Google Maps Api v1.0 -->
 
|signing= <!-- Empty or one of Self-Signed, DevCert, Manufacturer -->
 
|signing= <!-- Empty or one of Self-Signed, DevCert, Manufacturer -->
|capabilities= <!-- Capabilities required by the article/code example (e.g. Location, NetworkServices. -->
+
|capabilities= Location
 
|keywords= TPositionInfoBase, TPosition
 
|keywords= TPositionInfoBase, TPosition
 
|language= <!-- Language category code for non-English topics - e.g. Lang-Chinese -->
 
|language= <!-- Language category code for non-English topics - e.g. Lang-Chinese -->
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|author= [[User:Tepaa]]
 
|author= [[User:Tepaa]]
 
<!-- The following are not in current metadata -->
 
<!-- The following are not in current metadata -->
|subcategory= Location
 
 
|id= CS001412
 
|id= CS001412
 
}}
 
}}
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This snippet demonstrates two ways of using {{Icode|TPositionInfoBase}}:
 
This snippet demonstrates two ways of using {{Icode|TPositionInfoBase}}:
 
 
* getting the {{Icode|TPosition}} class from {{Icode|TPositionInfoBase}}
 
* getting the {{Icode|TPosition}} class from {{Icode|TPositionInfoBase}}
 
* showing {{Icode|TPosition}} in textual format
 
* showing {{Icode|TPosition}} in textual format
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Position data is read from {{Icode|TPositionInfoBase}}.
 
Position data is read from {{Icode|TPositionInfoBase}}.
  
 +
{{VersionHint}}
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[[Category:S60 3rd Edition (initial release)]] [[Category:S60 3rd Edition FP1]] [[Category:S60 3rd Edition FP2]]
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[[Category:S60 5th Edition]]
  
 
==See also==
 
==See also==
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* [[Retrieving location information using Symbian C++]]
 
* [[Retrieving location information using Symbian C++]]
 
* [http://www.developer.nokia.com/info/sw.nokia.com/id/b8bf64b5-97b0-48bc-9ea2-8f20430c34c0/S60_Platform_Location_Example.html S60 Platform Location Example]
 
* [http://www.developer.nokia.com/info/sw.nokia.com/id/b8bf64b5-97b0-48bc-9ea2-8f20430c34c0/S60_Platform_Location_Example.html S60 Platform Location Example]
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<!-- Translation --> [[zh-hans:从TPositionInfoBase获得位置数据]]
 
+
 
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[[Category:Code Snippet]]
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[[Category:Code Snippet]]
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Latest revision as of 08:59, 18 September 2012

Article Metadata
Tested with
Devices(s): Nokia 5800 XpressMusic
CompatibilityPlatform Security
Capabilities: Location
Article
Keywords: TPositionInfoBase, TPosition
Created: tepaa (06 May 2009)
Last edited: hamishwillee (18 Sep 2012)

Contents

[edit] Overview

This snippet demonstrates two ways of using TPositionInfoBase:

  • getting the TPosition class from TPositionInfoBase
  • showing TPosition in textual format


Note: The Location capability is included in the self-signing capabilities of S60 3rd Edition, Feature Pack 2 and newer platforms.


[edit] MMP file

The following libraries and capabilities are required:

CAPABILITY Location
LIBRARY lbs.lib


[edit] 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;


[edit] 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);
}
}


[edit] Postconditions

Position data is read from TPositionInfoBase.

[edit] Version Hint

Windows Phone: [[Category:Windows Phone]]
[[Category:Windows Phone 7.5]]
[[Category:Windows Phone 8]]

Nokia Asha: [[Category:Nokia Asha]]
[[Category:Nokia Asha Platform 1.0]]

Series 40: [[Category:Series 40]]
[[Category:Series 40 1st Edition]] [[Category:Series 40 2nd Edition]]
[[Category:Series 40 3rd Edition (initial release)]] [[Category:Series 40 3rd Edition FP1]] [[Category:Series 40 3rd Edition FP2]]
[[Category:Series 40 5th Edition (initial release)]] [[Category:Series 40 5th Edition FP1]]
[[Category:Series 40 6th Edition (initial release)]] [[Category:Series 40 6th Edition FP1]] [[Category:Series 40 Developer Platform 1.0]] [[Category:Series 40 Developer Platform 1.1]] [[Category:Series 40 Developer Platform 2.0]]

Symbian: [[Category:Symbian]]
[[Category:S60 1st Edition]] [[Category:S60 2nd Edition (initial release)]] [[Category:S60 2nd Edition FP1]] [[Category:S60 2nd Edition FP2]] [[Category:S60 2nd Edition FP3]]
[[Category:S60 3rd Edition (initial release)]] [[Category:S60 3rd Edition FP1]] [[Category:S60 3rd Edition FP2]]
[[Category:S60 5th Edition]]
[[Category:Symbian^3]] [[Category:Symbian Anna]] [[Category:Nokia Belle]]

[edit] See also

This page was last modified on 18 September 2012, at 08:59.
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