Re: How to handle WM_SIZE message in Doc/View architecture???
From: Awin (Awin_at_discussions.microsoft.com)
Date: 01/11/05
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- Reply: Iain: "Re: How to handle WM_SIZE message in Doc/View architecture???"
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Date: Tue, 11 Jan 2005 02:59:03 -0800
Dear Iain and Thore Karlsen,
Thanks for your reply, I post my code below, maybe I do something
wrong.
I declare below member varible to CView:
IGraphBuilder* m_pGraphBuilder;
IMediaControl* m_pMediaControl;
IBaseFilter* m_pSourceFilter;
IVMRWindowlessControl* m_pVMRWindowlessControl;
ICaptureGraphBuilder2* m_pCaptureGraphBuilder;
IBaseFilter* m_pVmr;
and one function member : EnumSystemDevice().
and do all initial steps in CView::OnInitialUpdate function, below are the
codes:
//In CView::OnInitialUpdate()
CView::OnInitialUpdate();
CoInitialize(NULL);
HRESULT hr = CoCreateInstance(CLSID_FilterGraph,
NULL,
CLSCTX_INPROC_SERVER,
IID_IGraphBuilder,
(void
**)&m_pGraphBuilder);
//Query m_pGraphBuilder interface IID_IMediaControl
m_pGraphBuilder->QueryInterface(IID_IMediaControl,
(void**)&m_pMediaControl);
//Create IID_ICaptureGraphBuilder2
hr = CoCreateInstance(CLSID_CaptureGraphBuilder2,
NULL,
CLSCTX_INPROC_SERVER,
IID_ICaptureGraphBuilder2,
(void**)&m_pCaptureGraphBuilder);
//Specifies a filter graph for the capture graph builder
m_pCaptureGraphBuilder->SetFiltergraph(m_pGraphBuilder);
//Enumarate all webcam in system, and bind it to m_SourceFilter,
//then add m_SourceFilter to m_pGraphBuilder
//EnumSystemDevice() is a helper function to find the first webcam,
//and add it to FilterGraph
hr = EnumSystemDevice();
//Create VMR
hr = CoCreateInstance(CLSID_VideoMixingRenderer,
NULL,
CLSCTX_INPROC,
IID_IBaseFilter,
(void**)&m_pVmr);
if (SUCCEEDED(hr))
hr = m_pGraphBuilder->AddFilter(m_pVmr, L"Video Mixing
Renderer");
else
m_pVmr->Release();
IVMRFilterConfig* pConfig;
hr = m_pVmr->QueryInterface(IID_IVMRFilterConfig, (void**)&pConfig);
if (SUCCEEDED(hr))
{
hr = pConfig->SetRenderingMode(VMRMode_Windowless);
pConfig->Release();
}
if (SUCCEEDED(hr))
{
// Set the window.
hr = m_pVmr->QueryInterface(IID_IVMRWindowlessControl,
(void**)&m_pVMRWindowlessControl);
if( SUCCEEDED(hr))
{
hr =
m_pVMRWindowlessControl->SetVideoClippingWindow(this->m_hWnd);
if (SUCCEEDED(hr))
{
//AfxMessageBox("SetVideoClippingWindow
Succeeded.");
}
else
{
AfxMessageBox("SetVideoClippingWindow
Failed.");
// An error occurred, so release the
interface.
m_pVMRWindowlessControl->Release();
}
}
}
hr = m_pCaptureGraphBuilder->RenderStream(&PIN_CATEGORY_PREVIEW,
&MEDIATYPE_Video,
m_pSourceFilter,
NULL, m_pVmr);
long lWidth, lHeight;
hr = m_pVMRWindowlessControl->GetNativeVideoSize(&lWidth, &lHeight,
NULL, NULL);
if (SUCCEEDED(hr))
{
RECT rcSrc, rcDest;
// Set the source rectangle.
::SetRect(&rcSrc, 0, 0, lWidth, lHeight);
// Get the window client area.
::GetClientRect(this->m_hWnd, &rcDest);
// Set the video position.
hr = m_pVMRWindowlessControl->SetVideoPosition(&rcSrc,
&rcDest);
}
if (SUCCEEDED(hr))
{
// Build the graph. For example:
m_pMediaControl->Run();
}
and in CView::OnSize() function:
CView::OnSize(nType, cx, cy);
long lWidth, lHeight;
HRESULT hr = m_pVMRWindowlessControl->GetNativeVideoSize(&lWidth,
&lHeight, NULL, NULL);
if (SUCCEEDED(hr))
{
RECT rcSrc, rcDest;
// Set the source rectangle.
::SetRect(&rcSrc, 0, 0, 320, 240);
// Get the window client area.
::GetClientRect(this->m_hWnd, &rcDest);
// Set the video position.
if (m_pVMRWindowlessControl)
{
hr = m_pVMRWindowlessControl->SetVideoPosition(&rcSrc,
&rcDest);
}
}
and the helper function CView::EnumSystemDevice()
HRESULT CCamViewView::EnumSystemDevice()
{
ICreateDevEnum *pSysDevEnum = NULL;
HRESULT hr = CoCreateInstance(CLSID_SystemDeviceEnum,
NULL,
CLSCTX_INPROC_SERVER,
IID_ICreateDevEnum,
(void
**)(&pSysDevEnum));
if (FAILED(hr))
{
AfxMessageBox("Create CLSID_SystemDeviceEnum failed");
return hr;
}
// Obtain a class enumerator for the video compressor
category.
IEnumMoniker *pEnumCat = NULL;
hr=pSysDevEnum->CreateClassEnumerator
(CLSID_VideoInputDeviceCategory,
&pEnumCat, 0);
if (hr == S_OK)
{
// Enumerate the monikers.
IMoniker *pMoniker = NULL;
ULONG cFetched;
while(pEnumCat->Next(1, &pMoniker, &cFetched) == S_OK)
{
IPropertyBag *pPropBag;
hr = pMoniker->BindToStorage(0, 0,
IID_IPropertyBag,
(void**)&pPropBag);
if (SUCCEEDED(hr))
{
// To retrieve the filter's friendly
name, do the following:
VARIANT varName;
VariantInit(&varName);
hr = pPropBag->Read(L"FriendlyName",
&varName, 0);
if (SUCCEEDED(hr))
{
// Display the name in your
UI somehow.
TCHAR webcamName[2048];
WideCharToMultiByte(CP_ACP,0,varName.bstrVal, -1, webcamName, 2048, NULL,
NULL);
//m_WebcamList.AddString(webcamName);
}
VariantClear(&varName);
// To create an instance of the
filter, do the following:
hr = pMoniker->BindToObject(NULL,
NULL,
ID_IBaseFilter,
(void**)&m_pSourceFilter);
// Now add the filter to the graph.
m_pGraphBuilder->AddFilter(m_pSourceFilter, L"Webcam Capture");
//Remember to release pFilter later.
pPropBag->Release();
}
pMoniker->Release();
}
pEnumCat->Release();
}
else
AfxMessageBox("Enumratoe system device failed");
pSysDevEnum->Release();
return hr;
}
These three functions are all I add in my project, to avoid unexpected
release, I remove all release call in my project.
You could add these three functions to your own project to see the error
message.
Thanks again!!!
- Next message: Alessandro Angeli [MVP::DigitalMedia]: "Re: Cannot display Pin Properties in GraphEdit?"
- Previous message: subhi: "Re: Audio video synchronisation in directshow"
- In reply to: Thore Karlsen [MVP DX]: "Re: How to handle WM_SIZE message in Doc/View architecture???"
- Next in thread: Iain: "Re: How to handle WM_SIZE message in Doc/View architecture???"
- Reply: Iain: "Re: How to handle WM_SIZE message in Doc/View architecture???"
- Messages sorted by: [ date ] [ thread ]
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