相关疑难解决方法(0)

因此，为了获取相机列表并让用户选择一个（C++、Boost、dshow、Windows），我使用这样的代码：

#include "StdAfx.h"
#include "list.h"
#include <windows.h>
#include <dshow.h>
#include <boost/lexical_cast.hpp>

HRESULT CamerasList::EnumerateDevices( REFGUID category, IEnumMoniker **ppEnum )
{
    // Create the System Device Enumerator.
    ICreateDevEnum *pDevEnum;
    HRESULT hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL,  
        CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&pDevEnum));

    if (SUCCEEDED(hr))
    {
        // Create an enumerator for the category.
        hr = pDevEnum->CreateClassEnumerator(category, ppEnum, 0);
        if (hr == S_FALSE)
        {
            hr = VFW_E_NOT_FOUND;  // The category is empty. Treat as an error.
        }
        pDevEnum->Release();
    }
    return hr;
}

int CamerasList::SelectFromList()
{   int i = 0;
    int …