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GPS and Web Service using C++ ATL/WTL (Windows Mobile 6, Standard)

, 18 Jan 2008 CPOL
This article explains how to use the GPS API and Web Service on a SmartPhone to show demographics information for the current location.
gpsdemographics.zip
GPSDemographicsSetup
GPSDemographicsSetup.vddproj
GPSDemographics
com_cdynews
DemographixQuery.disco
DemographixQuery.wsdl
results.discomap
res
background.bmp
Demographics.ico
gpsdemographicssetupcab.zip
GPSDemographicsSetup.CAB
// DemographicsView.cpp : implementation of the CDemographicsView class
//
/////////////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "resourcesp.h"
#include "DemographicsView.h"

#define DEMO_LICENSE _T("extendeddemo")
#define DIST_THRESHOLD 0.000025

CDemographicsView::CDemographicsView()
{
	::InitializeCriticalSection(&m_cs);

	memset(&m_info, 0, sizeof(DemographixQuery::SummaryInformation));
	memset(&m_gpsDevice, 0, sizeof(GPS_DEVICE));
	memset(&m_gpsPosition, 0, sizeof(GPS_POSITION));

	m_hBackground = AtlLoadBitmap(IDB_BACKGROUND);

	CFontHandle font = AtlGetDefaultGuiFont();
	LOGFONT lf;
	font.GetLogFont(&lf);

	lf.lfHeight = -::MulDiv(10, ::GetDeviceCaps(NULL, LOGPIXELSY), 72);
	m_DefaultFont.CreateFontIndirect(&lf);

	lf.lfWeight = FW_BOLD;
	m_DefaultFontBold.CreateFontIndirect(&lf);

	lf.lfWeight = FW_NORMAL;

	lf.lfHeight = -::MulDiv(9, ::GetDeviceCaps(NULL, LOGPIXELSY), 72);
	m_SmallFont.CreateFontIndirect(&lf);

	lf.lfWeight = FW_BOLD;
	m_SmallFontBold.CreateFontIndirect(&lf);

	m_oldLat = 0;
	m_oldLong = 0;
}

CDemographicsView::~CDemographicsView()
{
	::DeleteCriticalSection(&m_cs);
}


BOOL CDemographicsView::PreTranslateMessage(MSG* pMsg)
{
	pMsg;
	return FALSE;
}

LRESULT CDemographicsView::OnEraseBackground(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
{
	return 1; 
}

LRESULT CDemographicsView::OnPaint(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
{
	CPaintDC dc(m_hWnd);

	RECT clientRect = {0};
	
	GetClientRect(&clientRect);
	
	CMemoryDC memdc(dc, clientRect);
	memdc.SetBkMode(TRANSPARENT);
	
	CDC dcBmp;
	dcBmp.CreateCompatibleDC(memdc);
	HBITMAP hOld = dcBmp.SelectBitmap(m_hBackground);
	memdc.BitBlt(0,0,clientRect.right,clientRect.bottom,dcBmp,0,0,SRCCOPY);
	dcBmp.SelectBitmap(hOld);


	INT iFontSizePixel = 0;

	WCHAR wszTmp[MAX_PATH] = L"";

	SHGetUIMetrics(SHUIM_FONTSIZE_PIXEL,&iFontSizePixel,sizeof(iFontSizePixel),NULL);

    if (clientRect.bottom < iFontSizePixel * 9)
    {
		memdc.DrawText(L"Not enough Space", -1, &clientRect, DT_CENTER);
		return E_FAIL;
    }


	INT x = 76; 
	INT y = 11;
	INT nWidth = TextOut(x,y,_T("Sat: "),memdc,m_DefaultFontBold);

	StringCchPrintfEx(wszTmp,
        sizeof(wszTmp)/sizeof(wszTmp[0]),
        NULL,
        NULL,
        STRSAFE_NULL_ON_FAILURE,
        L"%d   ",m_gpsPosition.dwSatelliteCount);

	x+=nWidth;
	nWidth = TextOut(x,y,wszTmp,memdc,m_DefaultFont);

	x+=nWidth;
	nWidth = TextOut(x,y,_T("Lat: "),memdc,m_DefaultFontBold);

	StringCchPrintfEx(wszTmp,
        sizeof(wszTmp)/sizeof(wszTmp[0]),
        NULL,
        NULL,
        STRSAFE_NULL_ON_FAILURE,
		L"%2.3f  ",m_gpsPosition.dblLatitude);

	x+=nWidth;
	nWidth = TextOut(x,y,wszTmp,memdc,m_DefaultFont);

	x+=nWidth;
	nWidth = TextOut(x,y,_T("Long: "),memdc,m_DefaultFontBold);

	StringCchPrintfEx(wszTmp,
        sizeof(wszTmp)/sizeof(wszTmp[0]),
        NULL,
        NULL,
        STRSAFE_NULL_ON_FAILURE,
		L"%2.3f ",m_gpsPosition.dblLongitude);

	x+=nWidth;
	nWidth = TextOut(x,y,wszTmp,memdc,m_DefaultFont);	
	
	//memdc.DrawText(wszTmp, -1, &clientRect, DT_LEFT);


	CSize textSize;	
	memdc.GetTextExtent(_T("Income:  "),9,&textSize);

	nWidth = textSize.cx;
    x = 165; y = 50;

	TextOut(x,y,_T("Speed: "),memdc,m_DefaultFontBold);

    StringCchPrintfEx(wszTmp,
        sizeof(wszTmp)/sizeof(wszTmp[0]),
        NULL,
        NULL,
        STRSAFE_NULL_ON_FAILURE,
        L"%.0f mph",
        m_gpsPosition.flSpeed);    

	x+=nWidth;
	TextOut(x,y,wszTmp,memdc,m_DefaultFont);


	
    x = 165; y = 84;

	TextOut(x,y,_T("Income: "),memdc,m_DefaultFontBold);

    StringCchPrintfEx(wszTmp,
        sizeof(wszTmp)/sizeof(wszTmp[0]),
        NULL,
        NULL,
        STRSAFE_NULL_ON_FAILURE,
        L"$%d",
        m_info.MedianIncome);    

	x+=nWidth;
	TextOut(x,y,wszTmp,memdc,m_DefaultFont);
	
    x = 165; y = 118;

	TextOut(x,y,_T("Value: "),memdc,m_DefaultFontBold);

    StringCchPrintfEx(wszTmp,
        sizeof(wszTmp)/sizeof(wszTmp[0]),
        NULL,
        NULL,
        STRSAFE_NULL_ON_FAILURE,
        L"$%d",
        m_info.MedianHouseValue);    

	x+=nWidth;
	TextOut(x,y,wszTmp,memdc,m_DefaultFont);


	x= 65; y = 158;

	nWidth = TextOut(x,y,_T("Age: "),memdc,m_DefaultFontBold);

	StringCchPrintfEx(wszTmp,
        sizeof(wszTmp)/sizeof(wszTmp[0]),
        NULL,
        NULL,
        STRSAFE_NULL_ON_FAILURE,
        L"%d   ",m_info.MedianAge);

	x+=nWidth;
	nWidth = TextOut(x,y,wszTmp,memdc,m_DefaultFont);

	x+=nWidth;
	nWidth = TextOut(x,y,_T("Male: "),memdc,m_DefaultFontBold);

	StringCchPrintfEx(wszTmp,
        sizeof(wszTmp)/sizeof(wszTmp[0]),
        NULL,
        NULL,
        STRSAFE_NULL_ON_FAILURE,
		L"%3.0f%%  ",m_info.GenderPercentages.Male);

	x+=nWidth;
	nWidth = TextOut(x,y,wszTmp,memdc,m_DefaultFont);

	x+=nWidth;
	nWidth = TextOut(x,y,_T("Female: "),memdc,m_DefaultFontBold);

	StringCchPrintfEx(wszTmp,
        sizeof(wszTmp)/sizeof(wszTmp[0]),
        NULL,
        NULL,
        STRSAFE_NULL_ON_FAILURE,
		L"%3.0f%% ",m_info.GenderPercentages.Female);

	x+=nWidth;
	nWidth = TextOut(x,y,wszTmp,memdc,m_DefaultFont);


	memdc.GetTextExtent(_T("White:  "),8,&textSize);

	nWidth = textSize.cx;

	INT startX = 20;
	INT spaceY = 18;
	
	x= startX; y = 52;

	TextOut(x,y,_T("Asian:  "),memdc,m_SmallFontBold);

	StringCchPrintfEx(wszTmp,
        sizeof(wszTmp)/sizeof(wszTmp[0]),
        NULL,
        NULL,
        STRSAFE_NULL_ON_FAILURE,
		L"%2.2f%% ",m_info.RacePercentages.Asian);

	x+=nWidth;
	TextOut(x,y,wszTmp,memdc,m_SmallFont);

	
	x= startX;
	y+= spaceY;
	TextOut(x,y,_T("Black:  "),memdc,m_SmallFontBold);

	StringCchPrintfEx(wszTmp,
        sizeof(wszTmp)/sizeof(wszTmp[0]),
        NULL,
        NULL,
        STRSAFE_NULL_ON_FAILURE,
		L"%2.2f%% ",m_info.RacePercentages.Black);

	x+=nWidth;
	TextOut(x,y,wszTmp,memdc,m_SmallFont);

	x= startX;
	y+= spaceY;
	TextOut(x,y,_T("White:  "),memdc,m_SmallFontBold);

	StringCchPrintfEx(wszTmp,
        sizeof(wszTmp)/sizeof(wszTmp[0]),
        NULL,
        NULL,
        STRSAFE_NULL_ON_FAILURE,
		L"%2.2f%% ",m_info.RacePercentages.White);

	x+=nWidth;
	TextOut(x,y,wszTmp,memdc,m_SmallFont);

	x= startX;
	y+= spaceY;
	TextOut(x,y,_T("Other:  "),memdc,m_SmallFontBold);

	StringCchPrintfEx(wszTmp,
        sizeof(wszTmp)/sizeof(wszTmp[0]),
        NULL,
        NULL,
        STRSAFE_NULL_ON_FAILURE,
		L"%2.2f%% ",m_info.RacePercentages.Other + 
					m_info.RacePercentages.Indian + 
					m_info.RacePercentages.Mixed + 
					m_info.RacePercentages.NativeHawaiian);

	x+=nWidth;
	TextOut(x,y,wszTmp,memdc,m_SmallFont);


	return S_OK;
}

HRESULT CDemographicsView::SetGPSPosition(GPS_POSITION gps_Position)
{
	::EnterCriticalSection(&m_cs);

	m_gpsPosition = gps_Position;

	//We will update only if we have data
	if( m_gpsPosition.dwSatelliteCount != 0 )
	{
		double dist = (m_oldLat - gps_Position.dblLatitude) * (m_oldLat - gps_Position.dblLatitude) +
			(m_oldLong - gps_Position.dblLongitude) * (m_oldLong - gps_Position.dblLongitude);

		if( dist > DIST_THRESHOLD )
		{
			m_oldLat = gps_Position.dblLatitude;
			m_oldLong = gps_Position.dblLongitude;

			DemographixQuery::CDemographixQuery webService;
			
			
			HRESULT hr = webService.GetLocationInformationByLatitudeLongitude( 
				m_gpsPosition.dblLatitude,
				m_gpsPosition.dblLongitude, 
				CComBSTR(DEMO_LICENSE),
				&m_info);				
		}

		Invalidate();
	}

	::LeaveCriticalSection(&m_cs);

	return S_OK;
}

HRESULT CDemographicsView::SetGPSDeviceInfo(GPS_DEVICE gps_Device)
{
	::EnterCriticalSection(&m_cs);

	m_gpsDevice = gps_Device;

	Invalidate();

	::LeaveCriticalSection(&m_cs);

	return S_OK;
}

INT CDemographicsView::TextOut(INT x, INT y, LPCTSTR szText, CDC & dc, HFONT hfont)
{
	HFONT oldFont = dc.SelectFont(hfont);
	CSize textSize;	
	dc.ExtTextOut(x,y,0,NULL,szText);
	dc.GetTextExtent(szText,_tcslen(szText),&textSize);

	return textSize.cx;
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Valentin Ivanov
Chief Technology Officer CDYNE Corporation
United States United States
Developer, Maker and Tinkerer

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