previewdlg.cpp

《Visual C++视频技术方案宝典》配套光盘

// PreviewDlg.cpp : implementation file
//

#include "stdafx.h"
#include "Preview.h"
#include "PreviewDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
	CAboutDlg();

// Dialog Data
	//{{AFX_DATA(CAboutDlg)
	enum { IDD = IDD_ABOUTBOX };
	//}}AFX_DATA

	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CAboutDlg)
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
	//}}AFX_VIRTUAL

// Implementation
protected:
	//{{AFX_MSG(CAboutDlg)
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
	//{{AFX_DATA_INIT(CAboutDlg)
	//}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CAboutDlg)
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
	//{{AFX_MSG_MAP(CAboutDlg)
		// No message handlers
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CPreviewDlg dialog

CPreviewDlg::CPreviewDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CPreviewDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CPreviewDlg)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDI_ICON1);
}

void CPreviewDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CPreviewDlg)
		// NOTE: the ClassWizard will add DDX and DDV calls here
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CPreviewDlg, CDialog)
	//{{AFX_MSG_MAP(CPreviewDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_IDOK, OnOK)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CPreviewDlg message handlers

BOOL CPreviewDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Add "About..." menu item to system menu.

	// IDM_ABOUTBOX must be in the system command range.
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);

	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		CString strAboutMenu;
		strAboutMenu.LoadString(IDS_ABOUTBOX);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
	// TODO: Add extra initialization here
	
	ICaptureGraphBuilder2 * pBuilder = NULL;
	pGraph = NULL;
	pMediaControl = NULL;
	//枚举视频设备
	ICreateDevEnum *pDevEnum = NULL;
	CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC, 
		IID_ICreateDevEnum, (void **)&pDevEnum);
	IEnumMoniker *pClassEnum = NULL;

	pDevEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory, &pClassEnum, 0);
	ULONG cFetched;
	if (pClassEnum->Next(1, &pMoniker, &cFetched) == S_OK)     
	{
		pMoniker->BindToObject(0, 0, IID_IBaseFilter, (void**)&pSrc);
		pMoniker->Release(); 
	}
	pClassEnum->Release();

	CoCreateInstance(CLSID_CaptureGraphBuilder2,0,CLSCTX_INPROC_SERVER,IID_ICaptureGraphBuilder2,(void**)&pBuilder);
	CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, 
						IID_IGraphBuilder, (void **)&pGraph);

	pBuilder->SetFiltergraph(pGraph);
	pGraph->QueryInterface(IID_IMediaControl,(void**)&pMediaControl);
	pGraph->AddFilter(pSrc,L"avi");

	pPreview = NULL;

	CoCreateInstance(CLSID_VideoRenderer,0,CLSCTX_ALL,IID_IBaseFilter,(void**)&pPreview);
	if (pPreview != NULL)
	{
		pGraph->AddFilter(pPreview,L"preview");
		//连接引脚
		IPin * pSourceOut;
		pSourceOut = FindPin(pSrc,PINDIR_OUTPUT);
		IPin*  pPreIn = FindPin(pPreview,PINDIR_INPUT);
		pGraph->ConnectDirect(pSourceOut,pPreIn,NULL);

		//获取预览窗口
		IVideoWindow * pViewWnd= NULL;
		pPreview->QueryInterface(IID_IVideoWindow,(void**)&pViewWnd);
		
		if (pViewWnd)
		{
			//设置预览窗口的拥有者
			pViewWnd->put_Owner((long)m_hWnd);
			pViewWnd->put_Left(1);
			pViewWnd->put_Top(1);

			//获取预览窗口风格
			long style;
			pViewWnd->get_WindowStyle(&style);
			style = style & ~WS_CAPTION;
			style = style & ~WS_DLGFRAME;
			style = style & WS_CHILD;
			pViewWnd->put_WindowStyle(style);

			//设置预览窗口宽度和高度
			CRect rc;
			GetClientRect(rc);
			pViewWnd->put_Height(rc.Height()-60);
			pViewWnd->put_Width(rc.Width()-2);
		}
		pMediaControl->Run();
	}
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CPreviewDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CPreviewDlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}

// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CPreviewDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CPreviewDlg::OnCancel() 
{
	CDialog::OnCancel();
}

void CPreviewDlg::OnOK() 
{
	
}

//查找引脚
IPin* CPreviewDlg::FindPin(IBaseFilter *pFilter, PIN_DIRECTION dir)
{
	IEnumPins* pEnumPins;
	IPin* pOutpin;
	PIN_DIRECTION pDir;
	pFilter->EnumPins(&pEnumPins);

	while (pEnumPins->Next(1,&pOutpin,NULL)==S_OK)
	{
		pOutpin->QueryDirection(&pDir);
		if (pDir==dir)
		{
			return pOutpin;
		}
	}
	return 0;
}