87 lines
3.3 KiB
C++
87 lines
3.3 KiB
C++
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
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// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
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// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
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// PARTICULAR PURPOSE.
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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wchar_t const APP_DESCRIPTION[] = L"Location API SDK Asynchronous Sample";
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// The goal of this application is to show you how to use the Location API in an asynchronous fashion.
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// You will initialize the Location API and pass it your callback interface. Then, any time the location
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// changes, it will call our interface to let us know the change.
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#include <windows.h>
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#include <atlbase.h>
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#include <atlcom.h>
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#include <LocationApi.h> // This is the main Location API header
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#include "LocationCallback.h" // This is our callback interface that receives Location reports.
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class CInitializeATL : public CAtlExeModuleT<CInitializeATL>{};
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CInitializeATL g_InitializeATL; // Initializes ATL for this application. This also does CoInitialize for us
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int wmain()
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{
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HRESULT hr = CoInitializeEx(NULL, COINIT_MULTITHREADED | COINIT_DISABLE_OLE1DDE);;
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if (SUCCEEDED(hr))
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{
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wprintf(L"%s.\n\n", APP_DESCRIPTION);
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CComPtr<ILocation> spLocation; // This is the main Location interface
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CComObject<CLocationEvents>* pLocationEvents = NULL; // This is our callback object for location reports
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IID REPORT_TYPES[] = { IID_ILatLongReport }; // Array of report types of interest. Other ones include IID_ICivicAddressReport
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hr = spLocation.CoCreateInstance(CLSID_Location); // Create the Location object
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if (SUCCEEDED(hr))
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{
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hr = CComObject<CLocationEvents>::CreateInstance(&pLocationEvents); // Create the callback object
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if (NULL != pLocationEvents)
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{
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pLocationEvents->AddRef();
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}
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}
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if (SUCCEEDED(hr))
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{
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// Request permissions for this user account to receive location data for all the
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// types defined in REPORT_TYPES (which is currently just one report)
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if (FAILED(spLocation->RequestPermissions(NULL, REPORT_TYPES, ARRAYSIZE(REPORT_TYPES), FALSE))) // FALSE means an asynchronous request
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{
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wprintf(L"Warning: Unable to request permissions.\n");
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}
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// Tell the Location API that we want to register for reports (which is currently just one report)
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for (DWORD index = 0; index < ARRAYSIZE(REPORT_TYPES); index++)
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{
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hr = spLocation->RegisterForReport(pLocationEvents, REPORT_TYPES[index], 0);
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}
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}
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if (SUCCEEDED(hr))
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{
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// Wait until user presses a key to exit app. During this time the Location API
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// will send reports to our callback interface on another thread.
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system("pause");
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// Unregister from reports from the Location API
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for (DWORD index = 0; index < ARRAYSIZE(REPORT_TYPES); index++)
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{
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spLocation->UnregisterForReport(REPORT_TYPES[index]);
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}
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}
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// Cleanup
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if (NULL != pLocationEvents)
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{
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pLocationEvents->Release();
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pLocationEvents = NULL;
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}
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CoUninitialize();
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}
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return 0;
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}
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