Brew advanced and proficient-3G mobile value-added business operation, customization and development-77--obtain location information in BREW (LBS application)

The iposdet interface can directly obtain information such as longitude and latitude. The application can transmit the information to the server and the GIS system to develop a variety of applications. The iposdet usage example is as follows:

// Create the instance for posdet

Ishell_createinstance (Pi-> A. m_pishell, aeeclsid_posdet, (void **) & (Pi-> m_pposdet ));

If (Pi-> m_pposdet ){

// Initialize the callback function

Callback_init (& Pi-> simplegpscb, simplegps_posdetcb, Pi );

// You also can get seperate information through

Iposdet_getgpsinfo (Pi-> m_pposdet, aeegps_getinfo_location | aeegps_getinfo_velocity | average, minimum, & Pi-> m_gpsinfo, & Pi-> simplegpscb );

}

Return (true );

The simplegps_posdetcb function displays the location information on the screen. The code for displaying the latitude is as follows:

// Wasfactor is the factor between aeegpsinfo and real world data.

Str_to_wstr( "186413.5111", sznum, sizeof (sznum ));

Wgsfactor = wstr_to_float (sznum );

// Display latitude on the screen

Val = integertofloat (PME-> m_gpsinfo.dwlat );

Val = fdiv (Val, wgsfactor );

Floattowstr (Val, sznum, text_buffer_size );

Str_to_wstr ("Lat:", sztext, text_buffer_size );

Wstrcat (sztext, sznum );

// Idisplay_clearscreen (PME-> A. m_pidisplay );

Idisplay_drawtext (PME-> A. m_pidisplay, // display instance

Aee_font_bold, // use bold font

Sztext, // text-normally comes from resource

-1, //-1 = use full String Length

0, // ignored-idf_align_center

32, // ignored-idf_align_middle

Null, // No clipping

Idf_align_center );