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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/geolocation/win7_location_api_win.h"
#include "base/base_paths_win.h"
#include "base/command_line.h"
#include "base/file_path.h"
#include "base/logging.h"
#include "base/path_service.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/geoposition.h"
namespace {
const double kKnotsToMetresPerSecondConversionFactor = 0.5144;
void ConvertKnotsToMetresPerSecond(double* knots) {
*knots *= kKnotsToMetresPerSecondConversionFactor;
}
HINSTANCE LoadWin7Library(const string16& lib_name) {
FilePath sys_dir;
PathService::Get(base::DIR_SYSTEM, &sys_dir);
return LoadLibrary(sys_dir.Append(lib_name).value().c_str());
}
}
Win7LocationApi::Win7LocationApi(
HINSTANCE prop_library,
PropVariantToDoubleFunction PropVariantToDouble_function,
ILocation* locator)
: prop_lib_(prop_library),
PropVariantToDouble_function_(PropVariantToDouble_function),
locator_(locator) {
}
Win7LocationApi::~Win7LocationApi() {
if (prop_lib_ != NULL)
FreeLibrary(prop_lib_);
}
Win7LocationApi* Win7LocationApi::Create() {
if (!CommandLine::ForCurrentProcess()
->HasSwitch(switches::kExperimentalLocationFeatures))
return NULL;
// Load probsys.dll
string16 lib_needed = L"propsys.dll";
HINSTANCE prop_lib = LoadWin7Library(lib_needed);
if (!prop_lib)
return NULL;
// Get pointer to function.
PropVariantToDoubleFunction PropVariantToDouble_function;
PropVariantToDouble_function =
reinterpret_cast<PropVariantToDoubleFunction>(
GetProcAddress(prop_lib, "PropVariantToDouble"));
if (!PropVariantToDouble_function) {
FreeLibrary(prop_lib);
return NULL;
}
// Create the ILocation object that receives location reports.
HRESULT result_type;
CComPtr<ILocation> locator;
result_type = CoCreateInstance(
CLSID_Location, NULL, CLSCTX_INPROC, IID_PPV_ARGS(&locator));
if (!SUCCEEDED(result_type)) {
FreeLibrary(prop_lib);
return NULL;
}
IID reports_needed[] = { IID_ILatLongReport };
result_type = locator->RequestPermissions(NULL, reports_needed, 1, TRUE);
return new Win7LocationApi(prop_lib,
PropVariantToDouble_function,
locator);
}
void Win7LocationApi::GetPosition(Geoposition* position) {
DCHECK(position);
position->error_code = Geoposition::ERROR_CODE_POSITION_UNAVAILABLE;
if (!locator_)
return;
// Try to get a position fix
if (!GetPositionIfFixed(position))
return;
position->error_code = Geoposition::ERROR_CODE_NONE;
if (!position->IsValidFix()) {
// GetPositionIfFixed returned true, yet we've not got a valid fix.
// This shouldn't happen; something went wrong in the conversion.
NOTREACHED() << "Invalid position from GetPositionIfFixed: lat,long "
<< position->latitude << "," << position->longitude
<< " accuracy " << position->accuracy << " time "
<< position->timestamp.ToDoubleT();
position->error_code = Geoposition::ERROR_CODE_POSITION_UNAVAILABLE;
position->error_message = "Bad fix from Win7 provider";
}
}
bool Win7LocationApi::GetPositionIfFixed(Geoposition* position) {
HRESULT result_type;
CComPtr<ILocationReport> location_report;
CComPtr<ILatLongReport> lat_long_report;
result_type = locator_->GetReport(IID_ILatLongReport, &location_report);
// Checks to see if location access is allowed.
if (result_type == E_ACCESSDENIED)
position->error_code = Geoposition::ERROR_CODE_PERMISSION_DENIED;
// Checks for any other errors while requesting a location report.
if(!SUCCEEDED(result_type))
return false;
result_type = location_report->QueryInterface(&lat_long_report);
if(!SUCCEEDED(result_type))
return false;
result_type = lat_long_report->GetLatitude(&position->latitude);
if(!SUCCEEDED(result_type))
return false;
result_type = lat_long_report->GetLongitude(&position->longitude);
if(!SUCCEEDED(result_type))
return false;
result_type = lat_long_report->GetErrorRadius(&position->accuracy);
if (!SUCCEEDED(result_type) || position->accuracy <= 0)
return false;
double temp_dbl;
result_type = lat_long_report->GetAltitude(&temp_dbl);
if (SUCCEEDED(result_type))
position->altitude = temp_dbl;
result_type = lat_long_report->GetAltitudeError(&temp_dbl);
if (SUCCEEDED(result_type))
position->altitude_accuracy = temp_dbl;
PROPVARIANT heading;
PropVariantInit(&heading);
result_type = lat_long_report->GetValue(
SENSOR_DATA_TYPE_TRUE_HEADING_DEGREES, &heading);
if (SUCCEEDED(result_type))
PropVariantToDouble_function_(heading, &position->heading);
PROPVARIANT speed;
PropVariantInit(&speed);
result_type = lat_long_report->GetValue(
SENSOR_DATA_TYPE_SPEED_KNOTS, &speed);
if (SUCCEEDED(result_type)) {
PropVariantToDouble_function_(speed, &position->speed);
ConvertKnotsToMetresPerSecond(&position->speed);
}
position->timestamp = base::Time::Now();
return true;
}
bool Win7LocationApi::SetHighAccuracy(bool acc) {
HRESULT result_type;
result_type = locator_->SetDesiredAccuracy(IID_ILatLongReport,
acc ? LOCATION_DESIRED_ACCURACY_HIGH :
LOCATION_DESIRED_ACCURACY_DEFAULT);
return SUCCEEDED(result_type);
}
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