C++ directshow dll help

boyindie

Hi I have been fighting with this for days moving from random error to random error. I am trying to write what is effectively a software driver for a decklink blackmagic capture card using the directshow api. The code I have here is basically the sample code from the MSDN website to get all the video devices on the system but I just seem to get errors everytime I try to compile this!

#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 li

Mark Salsbery

What's in your stdafx.h file? You also shouldn't be including stdafx.h in your VideoCapture.h file if stdafx.h is used for a pre-compiled header. Mark