DirextX编程

开发平台：

Visual C++

EnumDevice.cpp：源码内容

							#include "StdAfx.h"
#include "EnumDevice.h"
CDeviceName::CDeviceName(void)
:m_FriendName(_T(""))
{
}
CDeviceName::~CDeviceName(void)
{
}
CEnumDevice::CEnumDevice(void)
{
}
CEnumDevice::~CEnumDevice(void)
{
}
HRESULT  CEnumDevice::EnumDevice(void)
{
	ICreateDevEnum *pDevEnum = NULL;
	IEnumMoniker *pEnum = NULL;
	IMoniker *pMoniker = NULL;
	// Create the System Device Enumerator.
	HRESULT hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL,
		CLSCTX_INPROC_SERVER, IID_ICreateDevEnum, 
		reinterpret_cast<void**>(&pDevEnum));
	if (SUCCEEDED(hr))
	{
		// Create an enumerator for the video capture category.
		hr = pDevEnum->CreateClassEnumerator(
			CLSID_VideoInputDeviceCategory,
			&pEnum, 0);
	}
	if(SUCCEEDED(hr) && hr==S_OK)
	{
		//HWND hList; // Handle to the list box.
		while (pEnum->Next(1, &pMoniker, NULL) == S_OK)
		{
			IBaseFilter *pCap = NULL;
			IPropertyBag *pPropBag;
			hr = pMoniker->BindToStorage(0, 0, IID_IPropertyBag, 
				(void**)(&pPropBag));
			if (FAILED(hr))
			{
				pMoniker->Release();
				continue;  // Skip this one, maybe the next one will work.
			} 
			// Find the description or friendly name.
			VARIANT varName;
			VariantInit(&varName);
			hr = pPropBag->Read(L"FriendlyName", &varName, 0);
			if (FAILED(hr))
			{
				hr = pPropBag->Read(L"Description", &varName, 0);
			}
			if (SUCCEEDED(hr))
			{
				// Add it 
				hr = pMoniker->BindToObject(0, 0, IID_IBaseFilter, (void**)&pCap);
				if (SUCCEEDED(hr))
				{
					CDeviceName *DeviceName = new CDeviceName();
					USES_CONVERSION;
					CString str(OLE2T(varName.bstrVal));
					DeviceName->m_FriendName = str; 
					DeviceName->pSrc = pCap;
					outlist.Add(DeviceName);
				}
				VariantClear(&varName);   
			}
			pPropBag->Release();
			pMoniker->Release();
		}
		pEnum->Release();
		pDevEnum->Release(); 
	}
	return hr;
}
IBaseFilter* CEnumDevice::GetCaptureDevice(int index)
{	
	IBaseFilter * tempCap = NULL;
	INT_PTR count = outlist.GetCount();
    if(index >= 0 && index <= count-1)
	{
		tempCap = outlist[index]->pSrc;
		for(int i=0;i<count;i++)
		{
          if( i != index) 
		  {
			  outlist[i]->pSrc->Release();
		  }
		  delete outlist[i];
		}
		return tempCap;
	}
	else
	{
         return  tempCap;
	}
}

						