本文介绍了如何唯一识别DirectShow音频渲染器过滤器?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
正如我刚发现的那样,友好名称并不能保证唯一。奖励积分,如果我可以从该标识符实例化筛选器而不必枚举它们。
As I just found out the hard way, friendly names are not guaranteed to be unique. Bonus points if I can instantiate the filter from that identifier without having to enumerate them.
推荐答案
可以识别包装WaveOut设备的渲染器筛选器通过WaveOutId。那些包装好的DirectSound设备可以由DSGuid识别。
Renderer filters wrapping WaveOut devices can be identified by WaveOutId. Those wrapping DirectSound devices can be identified by DSGuid.
ICreateDevEnum* devices;
if (CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER, IID_ICreateDevEnum, (LPVOID*)&devices) == S_OK)
{
IEnumMoniker* enumerator;
if (devices->CreateClassEnumerator(CLSID_AudioRendererCategory, &enumerator, 0) == S_OK)
{
IMoniker* moniker;
while (enumerator->Next(1, &moniker, NULL) == S_OK)
{
IPropertyBag* properties;
if (moniker->BindToStorage(NULL, NULL, IID_IPropertyBag, (void**)&properties) == S_OK)
{
VARIANT variant;
VariantInit(&variant);
if (properties->Read(L"WaveOutId", &variant, NULL) == S_OK)
{
// variant.lVal now contains the id of the wrapped WaveOut device.
}
else if (properties->Read(L"DSGuid", &variant, NULL) == S_OK)
{
// variant.bstrVal now contains an uppercase GUID.
// It's the same GUID you would get from DirectSoundEnumerate.
}
VariantClear(&variant);
properties->Release();
}
moniker->Release();
}
enumerator->Release();
}
devices->Release();
}
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