framegrabberdlg.cpp

Vc＋＋编写的抓图软件

// FrameGrabberDlg.cpp : implementation file
//

#include "stdafx.h"
#include "FrameGrabber.h"
#include "FrameGrabberDlg.h"
#include "DlgProxy.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()

/////////////////////////////////////////////////////////////////////////////
// CFrameGrabberDlg dialog

IMPLEMENT_DYNAMIC(CFrameGrabberDlg, CDialog);

CFrameGrabberDlg::CFrameGrabberDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CFrameGrabberDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CFrameGrabberDlg)
	m_editOpenDir = _T("");
	m_editSaveDir = _T("");
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
	m_pAutoProxy = NULL;
}

CFrameGrabberDlg::~CFrameGrabberDlg()
{
	// If there is an automation proxy for this dialog, set
	//  its back pointer to this dialog to NULL, so it knows
	//  the dialog has been deleted.
	if (m_pAutoProxy != NULL)
		m_pAutoProxy->m_pDialog = NULL;
}

void CFrameGrabberDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CFrameGrabberDlg)
	DDX_Text(pDX, IDC_OPENDIR, m_editOpenDir);
	DDX_Text(pDX, IDC_SAVEDIR, m_editSaveDir);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CFrameGrabberDlg, CDialog)
	//{{AFX_MSG_MAP(CFrameGrabberDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_WM_CLOSE()
	ON_BN_CLICKED(IDC_OPEN_BROWSE, OnOpenBrowse)
	ON_BN_CLICKED(IDC_SAVE_BROWSE, OnSaveBrowse)
	ON_BN_CLICKED(IDC_GRAB, OnGrab)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CFrameGrabberDlg message handlers

BOOL CFrameGrabberDlg::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
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CFrameGrabberDlg::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 CFrameGrabberDlg::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 CFrameGrabberDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

// Automation servers should not exit when a user closes the UI
//  if a controller still holds on to one of its objects.  These
//  message handlers make sure that if the proxy is still in use,
//  then the UI is hidden but the dialog remains around if it
//  is dismissed.

void CFrameGrabberDlg::OnClose() 
{
	if (CanExit())
		CDialog::OnClose();
}

void CFrameGrabberDlg::OnOK() 
{
	if (CanExit())
		CDialog::OnOK();
}

void CFrameGrabberDlg::OnCancel() 
{
	if (CanExit())
		CDialog::OnCancel();
}

BOOL CFrameGrabberDlg::CanExit()
{
	// If the proxy object is still around, then the automation
	//  controller is still holding on to this application.  Leave
	//  the dialog around, but hide its UI.
	if (m_pAutoProxy != NULL)
	{
		ShowWindow(SW_HIDE);
		return FALSE;
	}

	return TRUE;
}

void CFrameGrabberDlg::OnOpenBrowse() 
{
	char* pcsun="视频文件(*.mpg)|*.mpg||";
	CFileDialog  OpenDialog(TRUE,NULL,0,OFN_OVERWRITEPROMPT,pcsun,NULL);
	if(OpenDialog.DoModal() == IDCANCEL) return;
	//返回带文件名的路径，并传递给编辑控件变量
	m_editOpenDir = OpenDialog.GetPathName();
	UpdateData(FALSE);
}

void CFrameGrabberDlg::OnSaveBrowse() 
{
	char* pcsun="Bitmap File(*.bmp)|*.bmp||";
	CFileDialog  SaveDialog(FALSE,"bmp",0,OFN_OVERWRITEPROMPT,pcsun,NULL);
	if(SaveDialog.DoModal() == IDCANCEL) return;
	//返回带文件名的路径，并传递给编辑控件变量
	m_editSaveDir = SaveDialog.GetPathName();
	UpdateData(FALSE);
}

void CFrameGrabberDlg::OnGrab() 
{
	if (m_editOpenDir!="" && m_editSaveDir!="")
	{
		HRESULT hr;
		hr = GrabFrameFromMovie();
		if (hr != S_OK)
			AfxMessageBox("无法抓取帧！");
		else
			AfxMessageBox("抓取成功！");
	}
	else
		AfxMessageBox("前填写完整路径！");
}

HRESULT CFrameGrabberDlg::GrabFrameFromMovie()
{
	HRESULT hr;
	// 定义IMediaDet接口实例
	CComPtr< IMediaDet > pDet;
	hr = CoCreateInstance( CLSID_MediaDet, NULL, CLSCTX_INPROC_SERVER, 
		IID_IMediaDet, (void**) &pDet );
	if (FAILED(hr))
		return hr;
	
	// 将影片文件名转换成BSTR类型
	CComBSTR openBSTR(m_editOpenDir);
	// 设置IMediaDet接口的文件关联
	hr = pDet->put_Filename(openBSTR);
	if (FAILED(hr))
		return hr;
	
	// 从影片中检索视频流和音频流
	long lStreams;
    hr = pDet->get_OutputStreams(&lStreams);
    if (FAILED(hr))
		return hr;
	
	// 取出影片的视频流，因为帧的信息是保存在视频流中的
	bool bFound = false;
	for (int i=0; i<lStreams; i++)
	{
		GUID major_type;
		hr = pDet->put_CurrentStream(i);
		if (SUCCEEDED(hr))
			hr = pDet->get_StreamType(&major_type);
		if (FAILED(hr))
			break;
		if (major_type == MEDIATYPE_Video)
		{
			bFound = true;
			break;
		}
	}
	if (!bFound)
		return VFW_E_INVALIDMEDIATYPE;
	
	long width = 0, height = 0; // 存储位图的宽和高（单位：象素）
    AM_MEDIA_TYPE mt;
    hr = pDet->get_StreamMediaType(&mt);
    if (SUCCEEDED(hr))
    {
        if ((mt.formattype == FORMAT_VideoInfo) && 
            (mt.cbFormat >= sizeof(VIDEOINFOHEADER)))
        {
			// 得到VIDEOINFOHEADER结构指针，VIDEOINFOHEADER结构包含一些与视频
			// 有关的信息，其中含有BITMAPINFORHEADER结构
            VIDEOINFOHEADER *pVih = (VIDEOINFOHEADER*)(mt.pbFormat);
            width = pVih->bmiHeader.biWidth;
            height = pVih->bmiHeader.biHeight;
        }
        else
            hr = VFW_E_INVALIDMEDIATYPE;
        MyFreeMediaType(mt); // 释放AM_MEDIA_TYPE结构
    }
    if (FAILED(hr))
		return hr;
	
	CComBSTR saveBSTR(m_editSaveDir);
	// 将第一帧保存为指定路径的位图文件
	hr = pDet->WriteBitmapBits(0, width, height, saveBSTR);
	if (FAILED(hr))
		return hr;

	return S_OK;
}

void CFrameGrabberDlg::MyFreeMediaType(AM_MEDIA_TYPE &mt)
{
	if (mt.cbFormat != 0)
    {
        CoTaskMemFree((PVOID)mt.pbFormat);
        mt.cbFormat = 0;
        mt.pbFormat = NULL;
    }
    if (mt.pUnk != NULL)
    {
        mt.pUnk->Release();
        mt.pUnk = NULL;
    }
}