C / C++ / MFC

#pragma once
#include "stdafx.h"

#define DllExport __declspec(dllexport)
#pragma comment(lib,"Strmiids.lib")//Includes the directshow library

class VideoCapture
{
//constructor
public:
	VideoCapture(void);
	 void getNames();
	 void getDevice();
	 void createFilter();

	
public:
	~VideoCapture(void);

// test.cpp : Defines the entry point for the DLL application.
//
#include "stdafx.h"
#include "VideoCapture.h"
#include "dshow.h"
#include "Atlbase.h"
#include "Atlcom.h"



#ifdef _MANAGED
#pragma managed(push, off)
#endif

BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
					 )
{
    return TRUE;
}

#ifdef _MANAGED
#pragma managed(pop)
#endif



VideoCapture::VideoCapture(void)
{
}

VideoCapture::~VideoCapture(void)
{
}
     ICreateDevEnum *pDevEnum;
	 IEnumMoniker *pEnum =NULL;
	 HWND hList; 
	 IMoniker *pMoniker = NULL;
	 IFilterGraph *m_pGraph=NULL;
	 VARIANT varName;
	 IPropertyBag *pPropBag = NULL;
	 HRESULT hr;


	 __declspec(dllexport) void __cdecl getDevice()
	{
	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);
	}
  }

	__declspec(dllexport) void __cdecl getNames()
	{
		while (pEnum->Next(1, &pMoniker, NULL) == S_OK)
		{
		 
			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.
				
				VariantInit(&varName);
				hr = pPropBag->Read(L"Description", &varName, 0);
			   if (FAILED(hr))
			    {
					hr = pPropBag->Read(L"FriendlyName", &varName, 0);
				}
				if (SUCCEEDED(hr))
				{
					// Add it to the application's list box.
					USES_CONVERSION;
					(long)SendMessage(hList, LB_ADDSTRING, 0, 
					(LPARAM)OLE2T(varName.bstrVal));
					VariantClear(&varName); 
				}
			pPropBag->Release();
			pMoniker->Release();
		}
	}

	__declspec(dllexport) void __cdecl createFilter()
  {
	  IBaseFilter *pCap = NULL;
	  hr = pMoniker->BindToObject(0,0,IID_IBaseFilter,(void**)&pCap);
	  if (SUCCEEDED(hr))
	  {
		  hr = m_pGraph->AddFilter(pCap,L"Capture Filter");
	  }
  }