我有一个代码可以枚举系统上的所有音频端点,但我不知道如何找到哪个端点是默认端点。
int _tmain(int argc, _TCHAR* argv[])
{
HRESULT hr = S_OK;
IMMDeviceEnumerator *pEnumerator = NULL;
IMMDeviceCollection *pCollection = NULL;
IMMDevice *pEndpoint = NULL;
IPropertyStore *pProps = NULL;
LPWSTR pwszID = NULL;
system("pause");
CoInitialize(NULL);
hr = CoCreateInstance(
CLSID_MMDeviceEnumerator, NULL,
CLSCTX_ALL, IID_IMMDeviceEnumerator,
(void**) &pEnumerator);
EXIT_ON_ERROR(hr)
hr = pEnumerator->EnumAudioEndpoints(
eRender, DEVICE_STATE_ACTIVE,
&pCollection);
EXIT_ON_ERROR(hr)
UINT count;
hr = pCollection->GetCount(&count);
EXIT_ON_ERROR(hr)
if (count == 0)
{
printf("No endpoints found.\n");
}
// Each loop prints the name of an endpoint device.
for (ULONG i = 0; i < count; i++)
{
// Get pointer to endpoint number i.
hr = pCollection->Item(i, &pEndpoint);
EXIT_ON_ERROR(hr)
// Get the endpoint ID string.
hr = pEndpoint->GetId(&pwszID);
EXIT_ON_ERROR(hr)
hr = pEndpoint->OpenPropertyStore(
STGM_READ, &pProps);
EXIT_ON_ERROR(hr)
PROPVARIANT varName;
// Initialize container for property value.
PropVariantInit(&varName);
// Get the endpoint's friendly-name property.
hr = pProps->GetValue(
PKEY_Device_FriendlyName, &varName);
EXIT_ON_ERROR(hr)
hr = pProps->GetValue(PKEY_Device_DeviceDesc, &varName );
EXIT_ON_ERROR(hr)
// Print endpoint friendly name and endpoint ID.
printf("Endpoint %d: \"%S\" (%S)\n",i, varName.pwszVal, pwszID);
//printf("Endpoint %d: \"%S\" (%S)\n",i, varName.pwszVal, pwszID);
CoTaskMemFree(pwszID);
pwszID = NULL;
PropVariantClear(&varName);
SAFE_RELEASE(pProps)
SAFE_RELEASE(pEndpoint)
}
SAFE_RELEASE(pEnumerator)
SAFE_RELEASE(pCollection)
system("pause");
return 0;
Exit:
printf("Error!\n");
CoTaskMemFree(pwszID);
SAFE_RELEASE(pEnumerator)
SAFE_RELEASE(pCollection)
SAFE_RELEASE(pEndpoint)
SAFE_RELEASE(pProps)
}