// See: http://social.microsoft.com/Forums/en/Offtopic/thread/9ebd7ad6-a460-4a28-9de9-2af63fd4a13e
HRESULT RegisterDevice(LPCWSTR devID, ERole role)
{
IPolicyConfig *pPolicyConfig = nullptr;
HRESULT hr = CoCreateInstance(__uuidof(CPolicyConfigClient), NULL, CLSCTX_ALL, __uuidof(IPolicyConfig), (LPVOID *)&pPolicyConfig);
if (pPolicyConfig == nullptr) {
hr = CoCreateInstance(__uuidof(CPolicyConfigClient), NULL, CLSCTX_ALL, __uuidof(IPolicyConfig10), (LPVOID *)&pPolicyConfig);
}
if (pPolicyConfig == nullptr) {
hr = CoCreateInstance(__uuidof(CPolicyConfigClient), NULL, CLSCTX_ALL, __uuidof(IPolicyConfig7), (LPVOID *)&pPolicyConfig);
}
if (pPolicyConfig == nullptr) {
hr = CoCreateInstance(__uuidof(CPolicyConfigClient), NULL, CLSCTX_ALL, __uuidof(IPolicyConfigVista), (LPVOID *)&pPolicyConfig);
}
if (pPolicyConfig == nullptr) {
hr = CoCreateInstance(__uuidof(CPolicyConfigClient), NULL, CLSCTX_ALL, __uuidof(IPolicyConfig10_1), (LPVOID *)&pPolicyConfig);
}
if (pPolicyConfig != NULL) {
hr = pPolicyConfig->SetDefaultEndpoint(devID, role);
SAFE_RELEASE(pPolicyConfig);
}
return hr;
}
HRESULT RegisterDevice(PCWSTR devID)
{
HRESULT hr = S_FALSE;
InitCom();
IPolicyConfig *pPolicyConfig;
hr = CoCreateInstance(IID_CPolicyConfigClient, nullptr,
CLSCTX_ALL, IID_IPolicyConfig,
(LPVOID *)&pPolicyConfig);
if (hr == S_OK)
{
hr = pPolicyConfig->SetDefaultEndpoint(devID, eConsole);
if (hr == S_OK)
{
hr = pPolicyConfig->SetDefaultEndpoint(devID, eCommunications);
}
SAFE_RELEASE(pPolicyConfig);
}
UnInitCom();
return hr;
}
//-------------------------------------------------------------------------------------------------
void FMain()
{
if (const HWND hWnd = FindWindowW(g_wGuidClass, nullptr))
PostMessageW(hWnd, WM_CLOSE, 0, 0);
if (SUCCEEDED(CoInitializeEx(nullptr, COINIT_APARTMENTTHREADED)))
{
IMMDeviceEnumerator *immDeviceEnumerator;
if (CoCreateInstance(__uuidof(MMDeviceEnumerator), nullptr, CLSCTX_ALL, __uuidof(IMMDeviceEnumerator), reinterpret_cast<LPVOID*>(&immDeviceEnumerator)) == S_OK)
{
IMMDevice *immDeviceDefault;
if (immDeviceEnumerator->GetDefaultAudioEndpoint(eRender, eConsole, &immDeviceDefault) == S_OK)
{
wchar_t *wIdDefaultOld;
HRESULT hr = immDeviceDefault->GetId(&wIdDefaultOld);
immDeviceDefault->Release();
if (hr == S_OK)
{
IMMDeviceCollection *immDeviceCollection;
hr = immDeviceEnumerator->EnumAudioEndpoints(eRender, DEVICE_STATE_ACTIVE, &immDeviceCollection);
immDeviceEnumerator->Release();
if (hr == S_OK)
{
UINT iCount;
if (immDeviceCollection->GetCount(&iCount) == S_OK)
{
bool bFail = true;
for (UINT i = 0; i < iCount; ++i)
{
IMMDevice *immDevice;
if (immDeviceCollection->Item(i, &immDevice) == S_OK)
{
wchar_t *wIdEnum;
hr = immDevice->GetId(&wIdEnum);
immDevice->Release();
if (hr == S_OK)
{
if (FCompareMemoryW(wIdDefaultOld, wIdEnum))
{
bFail = false;
if (++i >= iCount)
i = 0;
hr = immDeviceCollection->Item(i, &immDevice);
immDeviceCollection->Release();
if (hr == S_OK)
{
wchar_t *wIdDefaultNew;
if (immDevice->GetId(&wIdDefaultNew) == S_OK)
{
IPropertyStore *ipStore;
hr = immDevice->OpenPropertyStore(STGM_READ, &ipStore);
immDevice->Release();
if (hr == S_OK)
{
PROPVARIANT propFriendlyName;
PropVariantInitFix(&propFriendlyName);
PROPERTYKEY propKeyFriendlyName;
propKeyFriendlyName.fmtid.Data1 = 0xA45C254E;
propKeyFriendlyName.fmtid.Data2 = 0xDF1C;
propKeyFriendlyName.fmtid.Data3 = 0x4EFD;
FCopyMemory(propKeyFriendlyName.fmtid.Data4);
propKeyFriendlyName.pid = 14;
hr = ipStore->GetValue(propKeyFriendlyName, &propFriendlyName);
ipStore->Release();
if (SUCCEEDED(hr))
{
IPolicyConfig *pPolicyConfig;
if (CoCreateInstance(__uuidof(CPolicyConfigClient), nullptr, CLSCTX_ALL, (GetVersion() & 0xFF) >= 10 ? __uuidof(IPolicyConfigWin10) : __uuidof(IPolicyConfig), reinterpret_cast<LPVOID*>(&pPolicyConfig)) == S_OK)
{
hr = pPolicyConfig->SetDefaultEndpoint(wIdDefaultNew, eConsole);
if (hr == S_OK)
{
pPolicyConfig->SetDefaultEndpoint(wIdDefaultNew, eMultimedia);
pPolicyConfig->SetDefaultEndpoint(wIdDefaultNew, eCommunications);
}
pPolicyConfig->Release();
if (hr == S_OK)
{
WNDCLASSEX wndCl;
wndCl.cbSize = sizeof(WNDCLASSEX);
wndCl.style = 0;
wndCl.lpfnWndProc = WindowProc;
wndCl.cbClsExtra = 0;
wndCl.cbWndExtra = 0;
wndCl.hInstance = GetModuleHandleW(nullptr);
wndCl.hIcon = nullptr;
wndCl.hCursor = nullptr;
wndCl.hbrBackground = nullptr;
wndCl.lpszMenuName = nullptr;
wndCl.lpszClassName = g_wGuidClass;
wndCl.hIconSm = nullptr;
if (RegisterClassExW(&wndCl))
{
if (CreateWindowExW(WS_EX_NOACTIVATE | WS_EX_LAYERED | WS_EX_TOOLWINDOW | WS_EX_TRANSPARENT | WS_EX_TOPMOST, g_wGuidClass, nullptr, WS_POPUP | WS_VISIBLE | WS_MAXIMIZE, 0, 0, 0, 0, nullptr, nullptr, wndCl.hInstance, propFriendlyName.pwszVal))
{
MSG msg;
while (GetMessageW(&msg, nullptr, 0, 0) > 0)
DispatchMessageW(&msg);
}
UnregisterClassW(g_wGuidClass, wndCl.hInstance);
}
}
}
}
PropVariantClear(&propFriendlyName);
}
CoTaskMemFree(wIdDefaultNew);
}
else
immDevice->Release();
}
break;
}
CoTaskMemFree(wIdEnum);
}
}
}
if (bFail)
immDeviceCollection->Release();
}
else
immDeviceCollection->Release();
}
CoTaskMemFree(wIdDefaultOld);
}
else
immDeviceEnumerator->Release();
}
else
immDeviceEnumerator->Release();
}
CoUninitialize();
}
}
