Exemplo n.º 1
0
int main( int argc, char* argv[] )
{
    // Initialise window
    pangolin::View& container = SetupPangoGLWithCuda(1024, 768);
    size_t cu_mem_start, cu_mem_end, cu_mem_total;
    cudaMemGetInfo( &cu_mem_start, &cu_mem_total );
    glClearColor(1,1,1,0);

    // Open video device
    hal::Camera video = OpenRpgCamera(argc,argv);

    // Capture first image
    pb::ImageArray images;

    // N cameras, each w*h in dimension, greyscale
    const size_t N = video.NumChannels();
    if( N != 2 ) {
        std::cerr << "Two images are required to run this program!" << std::endl;
        exit(1);
    }
    const size_t nw = video.Width();
    const size_t nh = video.Height();

    // Capture first image
    video.Capture(images);

    // Downsample this image to process less pixels
    const int max_levels = 6;
    const int level = roo::GetLevelFromMaxPixels( nw, nh, 640*480 );
//    const int level = 4;
    assert(level <= max_levels);

    // Find centered image crop which aligns to 16 pixels at given level
    const NppiRect roi = roo::GetCenteredAlignedRegion(nw,nh,16 << level,16 << level);

    // Load Camera intrinsics from file
    GetPot clArgs( argc, argv );
    const std::string filename = clArgs.follow("","-cmod");
    if( filename.empty() ) {
        std::cerr << "Camera models file is required!" << std::endl;
        exit(1);
    }
    const calibu::CameraRig rig = calibu::ReadXmlRig(filename);

    if( rig.cameras.size() != 2 ) {
        std::cerr << "Two camera models are required to run this program!" << std::endl;
        exit(1);
    }

    Eigen::Matrix3f CamModel0 = rig.cameras[0].camera.K().cast<float>();
    Eigen::Matrix3f CamModel1 = rig.cameras[1].camera.K().cast<float>();

    roo::ImageIntrinsics camMod[] = {
        {CamModel0(0,0),CamModel0(1,1),CamModel0(0,2),CamModel0(1,2)},
        {CamModel1(0,0),CamModel1(1,1),CamModel1(0,2),CamModel1(1,2)}
    };

    for(int i=0; i<2; ++i ) {
        // Adjust to match camera image dimensions
        const double scale = nw / rig.cameras[i].camera.Width();
        roo::ImageIntrinsics camModel = camMod[i].Scale( scale );

        // Adjust to match cropped aligned image
        camModel = camModel.CropToROI( roi );

        camMod[i] = camModel;
    }

    const unsigned int w = roi.width;
    const unsigned int h = roi.height;
    const unsigned int lw = w >> level;
    const unsigned int lh = h >> level;

    const Eigen::Matrix3d& K0 = camMod[0].Matrix();
    const Eigen::Matrix3d& Kl = camMod[0][level].Matrix();

    std::cout << "K Matrix: " << std::endl << K0 << std::endl;
    std::cout << "K Matrix - Level: " << std::endl << Kl << std::endl;

    std::cout << "Video stream dimensions: " << nw << "x" << nh << std::endl;
    std::cout << "Chosen Level: " << level << std::endl;
    std::cout << "Processing dimensions: " << lw << "x" << lh << std::endl;
    std::cout << "Offset: " << roi.x << "x" << roi.y << std::endl;

    // print selected camera model
    std::cout << "Camera Model used: " << std::endl << camMod[0][level].Matrix() << std::endl;

    Eigen::Matrix3d RDFvision;RDFvision<< 1,0,0,  0,1,0,  0,0,1;
    Eigen::Matrix3d RDFrobot; RDFrobot << 0,1,0,  0,0, 1,  1,0,0;
    Eigen::Matrix4d T_vis_ro = Eigen::Matrix4d::Identity();
    T_vis_ro.block<3,3>(0,0) = RDFvision.transpose() * RDFrobot;
    Eigen::Matrix4d T_ro_vis = Eigen::Matrix4d::Identity();
    T_ro_vis.block<3,3>(0,0) = RDFrobot.transpose() * RDFvision;

    const Sophus::SE3d T_rl_orig = T_rlFromCamModelRDF(rig.cameras[0], rig.cameras[1], RDFvision);

    // TODO(jmf): For now, assume cameras are rectified. Later allow unrectified cameras.
    /*
    double k1 = 0;
    double k2 = 0;

    if(cam[0].Type() == MVL_CAMERA_WARPED)
    {
        k1 = cam[0].GetModel()->warped.kappa1;
        k2 = cam[0].GetModel()->warped.kappa2;
    }
    */

    const bool rectify = false;
    if(!rectify) {
        std::cout << "Using pre-rectified images" << std::endl;
    }

    // Check we received at least two images
    if(images.Size() < 2) {
        std::cerr << "Failed to capture first stereo pair from camera" << std::endl;
        return -1;
    }

    // Define Camera Render Object (for view / scene browsing)
    pangolin::OpenGlRenderState s_cam(
        pangolin::ProjectionMatrixRDF_TopLeft(w,h,K0(0,0),K0(1,1),K0(0,2),K0(1,2),0.1,10000),
        pangolin::IdentityMatrix(pangolin::GlModelViewStack)
    );

    pangolin::GlBufferCudaPtr vbo(pangolin::GlArrayBuffer, lw*lh,GL_FLOAT, 4, cudaGraphicsMapFlagsWriteDiscard, GL_STREAM_DRAW );
    pangolin::GlBufferCudaPtr cbo(pangolin::GlArrayBuffer, lw*lh,GL_UNSIGNED_BYTE, 4, cudaGraphicsMapFlagsWriteDiscard, GL_STREAM_DRAW );
    pangolin::GlBuffer ibo = pangolin::MakeTriangleStripIboForVbo(lw,lh);

    // Allocate Camera Images on device for processing
    roo::Image<unsigned char, roo::TargetHost, roo::DontManage> hCamImg[] = {{0,nw,nh},{0,nw,nh}};
    roo::Image<float2, roo::TargetDevice, roo::Manage> dLookup[] = {{w,h},{w,h}};

    roo::Image<unsigned char, roo::TargetDevice, roo::Manage> upload(w,h);
    roo::Pyramid<unsigned char, max_levels, roo::TargetDevice, roo::Manage> img_pyr[] = {{w,h},{w,h}};

    roo::Image<float, roo::TargetDevice, roo::Manage> img[] = {{lw,lh},{lw,lh}};
    roo::Volume<float, roo::TargetDevice, roo::Manage> vol[] = {{lw,lh,MAXD},{lw,lh,MAXD}};
    roo::Image<float, roo::TargetDevice, roo::Manage>  disp[] = {{lw,lh},{lw,lh}};
    roo::Image<float, roo::TargetDevice, roo::Manage> meanI(lw,lh);
    roo::Image<float, roo::TargetDevice, roo::Manage> varI(lw,lh);
    roo::Image<float, roo::TargetDevice, roo::Manage> temp[] = {{lw,lh},{lw,lh},{lw,lh},{lw,lh},{lw,lh}};

    roo::Image<float,roo::TargetDevice, roo::Manage>& imgd = disp[0];
    roo::Image<float,roo::TargetDevice, roo::Manage> depthmap(lw,lh);
    roo::Image<float,roo::TargetDevice, roo::Manage> imga(lw,lh);
    roo::Image<float2,roo::TargetDevice, roo::Manage> imgq(lw,lh);
    roo::Image<float,roo::TargetDevice, roo::Manage> imgw(lw,lh);

    roo::Image<float4, roo::TargetDevice, roo::Manage>  d3d(lw,lh);
    roo::Image<unsigned char, roo::TargetDevice,roo::Manage> Scratch(lw*sizeof(roo::LeastSquaresSystem<float,6>),lh);

    typedef ulong4 census_t;
    roo::Image<census_t, roo::TargetDevice, roo::Manage> census[] = {{lw,lh},{lw,lh}};

    // Stereo transformation (post-rectification)
    Sophus::SE3d T_rl = T_rl_orig;

    const double baseline = T_rl.translation().norm();
    std::cout << "Baseline: " << baseline << std::endl;

    cudaMemGetInfo( &cu_mem_end, &cu_mem_total );
    std::cout << "CuTotal: " << cu_mem_total/(1024*1024) << ", Available: " << cu_mem_end/(1024*1024) << ", Used: " << (cu_mem_start-cu_mem_end)/(1024*1024) << std::endl;

    pangolin::Var<bool> step("ui.step", false, false);
    pangolin::Var<bool> run("ui.run", false, true);
    pangolin::Var<bool> lockToCam("ui.Lock to cam", false, true);
    pangolin::Var<int> show_slice("ui.show slice",MAXD/2, 0, MAXD-1);

    pangolin::Var<int> maxdisp("ui.maxdisp",MAXD, 0, MAXD);
    pangolin::Var<bool> subpix("ui.subpix", true, true);

    pangolin::Var<bool> use_census("ui.use census", true, true);
    pangolin::Var<int> avg_rad("ui.avg_rad",0, 0, 100);

    pangolin::Var<bool> do_dtam("ui.do dtam", false, true);
    pangolin::Var<bool> dtam_reset("ui.reset", false, false);

    pangolin::Var<float> g_alpha("ui.g alpha", 14, 0,4);
    pangolin::Var<float> g_beta("ui.g beta", 2.5, 0,2);


    pangolin::Var<float> theta("ui.theta", 100, 0,100);
    pangolin::Var<float> lambda("ui.lambda", 20, 0,20);
    pangolin::Var<float> sigma_q("ui.sigma q", 0.7, 0, 1);
    pangolin::Var<float> sigma_d("ui.sigma d", 0.7, 0, 1);
    pangolin::Var<float> huber_alpha("ui.huber alpha", 0.002, 0, 0.01);
    pangolin::Var<float> beta("ui.beta", 0.00001, 0, 0.01);

    pangolin::Var<float> alpha("ui.alpha", 0.9, 0,1);
    pangolin::Var<float> r1("ui.r1", 100, 0,0.01);
    pangolin::Var<float> r2("ui.r2", 100, 0,0.01);

    pangolin::Var<bool> filter("ui.filter", false, true);
    pangolin::Var<float> eps("ui.eps",0.01*0.01, 0, 0.01);
    pangolin::Var<int> rad("ui.radius",9, 1, 20);

    pangolin::Var<bool> leftrightcheck("ui.left-right check", false, true);
    pangolin::Var<float> maxdispdiff("ui.maxdispdiff",1, 0, 5);

    pangolin::Var<int> domedits("ui.median its",1, 1, 10);
    pangolin::Var<bool> domed9x9("ui.median 9x9", false, true);
    pangolin::Var<bool> domed7x7("ui.median 7x7", false, true);
    pangolin::Var<bool> domed5x5("ui.median 5x5", false, true);
    pangolin::Var<int> medi("ui.medi",12, 0, 24);

    pangolin::Var<float> filtgradthresh("ui.filt grad thresh", 0, 0, 20);

    pangolin::Var<bool> save_depthmaps("ui.save_depthmaps", false, true);

    int jump_frames = 0;

    pangolin::RegisterKeyPressCallback(' ', [&run](){run = !run;} );
    pangolin::RegisterKeyPressCallback('l', [&lockToCam](){lockToCam = !lockToCam;} );
    pangolin::RegisterKeyPressCallback(pangolin::PANGO_SPECIAL + GLUT_KEY_RIGHT, [&step](){step=true;} );
    pangolin::RegisterKeyPressCallback(']', [&jump_frames](){jump_frames=100;} );
    pangolin::RegisterKeyPressCallback('}', [&jump_frames](){jump_frames=1000;} );

    pangolin::Handler2dImageSelect handler2d(lw,lh,level);
//    ActivateDrawPyramid<unsigned char,max_levels> adleft(img_pyr[0],GL_LUMINANCE8, false, true);
//    ActivateDrawPyramid<unsigned char,max_levels> adright(img_pyr[1],GL_LUMINANCE8, false, true);
    pangolin::ActivateDrawImage<float> adleft(img[0],GL_LUMINANCE32F_ARB, false, true);
    pangolin::ActivateDrawImage<float> adright(img[1],GL_LUMINANCE32F_ARB, false, true);
    pangolin::ActivateDrawImage<float> adisp(disp[0],GL_LUMINANCE32F_ARB, false, true);
    pangolin::ActivateDrawImage<float> adw(imgw,GL_LUMINANCE32F_ARB, false, true);
//    ActivateDrawImage<float> adCrossSection(dCrossSection,GL_RGBA_FLOAT32_APPLE, false, true);
    pangolin::ActivateDrawImage<float> adVol(vol[0].ImageXY(show_slice),GL_LUMINANCE32F_ARB, false, true);

    SceneGraph::GLSceneGraph graph;
    SceneGraph::GLVbo glvbo(&vbo,&ibo,&cbo);
    graph.AddChild(&glvbo);

    SetupContainer(container, 6, (float)w/h);
    container[0].SetDrawFunction(boost::ref(adleft)).SetHandler(&handler2d);
    container[1].SetDrawFunction(boost::ref(adright)).SetHandler(&handler2d);
    container[2].SetDrawFunction(boost::ref(adisp)).SetHandler(&handler2d);
    container[3].SetDrawFunction(boost::ref(adVol)).SetHandler(&handler2d);
    container[4].SetDrawFunction(SceneGraph::ActivateDrawFunctor(graph, s_cam))
                .SetHandler( new pangolin::Handler3D(s_cam, pangolin::AxisNone) );
    container[5].SetDrawFunction(boost::ref(adw)).SetHandler(&handler2d);

    for(unsigned long frame=0; !pangolin::ShouldQuit();)
    {
        bool go = frame==0 || jump_frames > 0 || run || Pushed(step);

        for(; jump_frames > 0; jump_frames--) {
            video.Capture(images);
        }

        if(go) {
            if(frame>0) {
                if( video.Capture(images) == false) {
                    exit(1);
                }
            }

            frame++;

            /////////////////////////////////////////////////////////////
            // Upload images to device (Warp / Decimate if necessery)
            for(int i=0; i<2; ++i ) {
                hCamImg[i].ptr = images[i].data();

                if(rectify) {
                    upload.CopyFrom(hCamImg[i].SubImage(roi));
                    Warp(img_pyr[i][0], upload, dLookup[i]);
                }else{
                    img_pyr[i][0].CopyFrom(hCamImg[i].SubImage(roi));
                }

                roo::BoxReduce<unsigned char, max_levels, unsigned int>(img_pyr[i]);
            }
        }

        go |= avg_rad.GuiChanged() | use_census.GuiChanged();
        if( go ) {
            for(int i=0; i<2; ++i ) {
                roo::ElementwiseScaleBias<float,unsigned char,float>(img[i], img_pyr[i][level],1.0f/255.0f);
                if(avg_rad > 0 ) {
                    roo::BoxFilter<float,float,float>(temp[0],img[i],Scratch,avg_rad);
                    roo::ElementwiseAdd<float,float,float,float>(img[i], img[i], temp[0], 1, -1, 0.5);
                }
                if(use_census) {
                    Census(census[i], img[i]);
                }
            }
        }

        if( go | g_alpha.GuiChanged() || g_beta.GuiChanged() ) {
            ExponentialEdgeWeight(imgw, img[0], g_alpha, g_beta);
        }

        go |= filter.GuiChanged() | leftrightcheck.GuiChanged() | rad.GuiChanged() | eps.GuiChanged() | alpha.GuiChanged() | r1.GuiChanged() | r2.GuiChanged();
        if(go) {
            if(use_census) {
                roo::CensusStereoVolume<float, census_t>(vol[0], census[0], census[1], maxdisp, -1);
                if(leftrightcheck) roo::CensusStereoVolume<float, census_t>(vol[1], census[1], census[0], maxdisp, +1);
            }else{
                CostVolumeFromStereoTruncatedAbsAndGrad(vol[0], img[0], img[1], -1, alpha, r1, r2);
                if(leftrightcheck) CostVolumeFromStereoTruncatedAbsAndGrad(vol[1], img[1], img[0], +1, alpha, r1, r2);
            }

            if(filter) {
                // Filter Cost volume
                for(int v=0; v<(leftrightcheck?2:1); ++v)
                {
                    roo::Image<float, roo::TargetDevice, roo::Manage>& I = img[v];
                    roo::ComputeMeanVarience<float,float,float>(varI, temp[0], meanI, I, Scratch, rad);

                    for(int d=0; d<maxdisp; ++d)
                    {
                        roo::Image<float> P = vol[v].ImageXY(d);
                        roo::ComputeCovariance(temp[0],temp[2],temp[1],P,meanI,I,Scratch,rad);
                        GuidedFilter(P,temp[0],varI,temp[1],meanI,I,Scratch,temp[2],temp[3],temp[4],rad,eps);
                    }
                }
            }
        }

        static int n = 0;
//        static float theta = 0;
//        go |= Pushed(dtam_reset);
//        if(go )
        if(Pushed(dtam_reset))
        {
            n = 0;
            theta.Reset();

            // Initialise primal and auxillary variables
            CostVolMinimumSubpix(imgd,vol[0], maxdisp,-1);
            imga.CopyFrom(imgd);

            // Initialise dual variable
            imgq.Memset(0);
        }

        const double min_theta = 1E-0;
        if(do_dtam && theta > min_theta)
        {
            for(int i=0; i<5; ++i ) {
                // Auxillary exhaustive search
                CostVolMinimumSquarePenaltySubpix(imga, vol[0], imgd, maxdisp, -1, lambda, (theta) );

                // Dual Ascent
                roo::WeightedHuberGradU_DualAscentP(imgq, imgd, imgw, sigma_q, huber_alpha);

                // Primal Descent
                roo::WeightedL2_u_minus_g_PrimalDescent(imgd, imgq, imga, imgw, sigma_d, 1.0f / (theta) );

                theta= theta * (1-beta*n);
                ++n;
            }
            if( theta <= min_theta && save_depthmaps ) {
                cv::Mat dmap = cv::Mat( lh, lw, CV_32FC1 );
                // convert disparity to depth
                roo::Disp2Depth(imgd, depthmap, Kl(0,0), baseline );
                depthmap.MemcpyToHost( dmap.data );

                // save depth image
                char            Index[10];
                sprintf( Index, "%05d", frame );
                std::string DepthPrefix = "SDepth-";
                std::string DepthFile;
                DepthFile = DepthPrefix + Index + ".pdm";
                std::cout << "Depth File: " << DepthFile << std::endl;
                std::ofstream pDFile( DepthFile.c_str(), std::ios::out | std::ios::binary );
                pDFile << "P7" << std::endl;
                pDFile << dmap.cols << " " << dmap.rows << std::endl;
                unsigned int Size = dmap.elemSize1() * dmap.rows * dmap.cols;
                pDFile << 4294967295 << std::endl;
                pDFile.write( (const char*)dmap.data, Size );
                pDFile.close();

                // save grey image
                std::string GreyPrefix = "Left-";
                std::string GreyFile;
                GreyFile = GreyPrefix + Index + ".pgm";
                std::cout << "Grey File: " << GreyFile << std::endl;
                cv::Mat gimg = cv::Mat( lh, lw, CV_8UC1 );
                img_pyr[0][level].MemcpyToHost( gimg.data );
                cv::imwrite( GreyFile, gimg );

                 // reset
                step = true;
                dtam_reset = true;
            }
        }

        go |= pangolin::GuiVarHasChanged();
//        if(go) {
//            if(subpix) {
//                CostVolMinimumSubpix(disp[0],vol[0], maxdisp,-1);
//                if(leftrightcheck) CostVolMinimumSubpix(disp[1],vol[1], maxdisp,+1);
//            }else{
//                CostVolMinimum<float,float>(disp[0],vol[0], maxdisp);
//                if(leftrightcheck) CostVolMinimum<float,float>(disp[1],vol[1], maxdisp);
//            }

//        }

        if(go) {
            for(int di=0; di<(leftrightcheck?2:1); ++di) {
                for(int i=0; i < domedits; ++i ) {
                    if(domed9x9) MedianFilterRejectNegative9x9(disp[di],disp[di], medi);
                    if(domed7x7) MedianFilterRejectNegative7x7(disp[di],disp[di], medi);
                    if(domed5x5) MedianFilterRejectNegative5x5(disp[di],disp[di], medi);
                }
            }

            if(leftrightcheck ) {
                LeftRightCheck(disp[1], disp[0], +1, maxdispdiff);
                LeftRightCheck(disp[0], disp[1], -1, maxdispdiff);
            }

            if(filtgradthresh > 0) {
                FilterDispGrad(disp[0], disp[0], filtgradthresh);
            }
        }

//        if(go)
        {
            // Generate point cloud from disparity image
            DisparityImageToVbo(d3d, disp[0], baseline, Kl(0,0), Kl(1,1), Kl(0,2), Kl(1,2) );

//            if(container[3].IsShown())
            {
                // Copy point cloud into VBO
                {
                    pangolin::CudaScopedMappedPtr var(vbo);
                    roo::Image<float4> dVbo((float4*)*var,lw,lh);
                    dVbo.CopyFrom(d3d);
                }

                // Generate CBO
                {
                    pangolin::CudaScopedMappedPtr var(cbo);
                    roo::Image<uchar4> dCbo((uchar4*)*var,lw,lh);
                    roo::ConvertImage<uchar4,unsigned char>(dCbo, img_pyr[0][level]);
                }
            }

            // Update texture views
            adisp.SetImageScale(1.0f/maxdisp);
//            adleft.SetLevel(show_level);
//            adright.SetLevel(show_level);
            adVol.SetImage(vol[0].ImageXY(show_slice));
        }

        /////////////////////////////////////////////////////////////
        // Draw

        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
        glColor3f(1,1,1);

        pangolin::FinishFrame();
    }
}
Exemplo n.º 2
0
int _tmain(int argc, _TCHAR* argv[])
{
	//BSTR的使用
	{
		BSTR bstrA = SysAllocString(L"Hello BSTR");
		BSTR bstrB = SysAllocStringLen(bstrA, SysStringLen(bstrA));
		SysFreeString(bstrA);
		SysFreeString(bstrB);
	}

	//用VARIANT保存LONG
	{
		VARIANT var;
		VariantInit(&var);

		var.vt = VT_I4;
		var.lVal = 100;

		VariantClear(&var);

		int i = 0;
		i++;
	}

	//用VARIANT保存FLOAT
	{
		VARIANT var;
		VariantInit(&var);
		
		var.vt = VT_R4;
		var.fltVal = 1.23f;

		VariantClear(&var);
	}

	//用VARIANT保存BSTR
	{
		VARIANT var;
		VariantInit(&var);
		
		var.vt = VT_BSTR;
		var.bstrVal = SysAllocString(L"Hello World");

		VariantClear(&var);
	}

	//用VARIANT保存布尔类型
	{
		VARIANT var;
		VariantInit(&var);

		var.vt = VT_BOOL;
		var.boolVal = VARIANT_FALSE;

		VariantClear(&var);
	}

	//从VARIANT读取相应类型的值
	{
		VARIANT var;
		VariantInit(&var);

		var.vt = VT_I4;
		var.lVal = 100;

		if (var.vt == VT_I4)
		{ 
			LONG lValue = var.lVal;
		}
		else if (var.vt == VT_R4)
		{
			FLOAT fValue = var.fltVal;
		}
		else if (var.vt == VT_BSTR)
		{
			BSTR bstrValue = var.bstrVal;
		}
		else if (var.vt == VT_BOOL)
		{
			VARIANT_BOOL varbValue = var.boolVal;
		}

		VariantClear(&var);
	}

	//COM数据类型的转换,LONG转成FLOAT
	{
		VARIANT var;
		VariantInit(&var);

		var.vt = VT_I4;
		var.lVal = 100;

		VariantChangeType(&var,&var,0, VT_R4);

		if (var.vt == VT_R4)
		{
			FLOAT fValue = var.fltVal;
		}

		VariantClear(&var);
	}

	//COM数据类型的转换,LONG转成BSTR
	{
		VARIANT var;
		VariantInit(&var);

		var.vt = VT_I4;
		var.lVal = 100;

		VariantChangeType(&var,&var,0, VT_BSTR);

		if (var.vt == VT_BSTR)
		{
			BSTR fValue = var.bstrVal;
		}

		VariantClear(&var);
	}

	//CComVariant的构造方法
	{
		VARIANT varA;
		CComVariant varB;
		CComVariant varC(varA);
		CComVariant varD(varB);
		CComVariant varE(L"Hello CComVariant");
		CComVariant varF("CComVariant");
		CComVariant varG(true);
		CComVariant varH(100L);
		CComVariant varI(1.23f);
		//....

	}

	//CComVariant的赋值方法
	{
		VARIANT varA;
		CComVariant varB;
		CComVariant varC;
		varC = varA;
		varC = varB;
		varC = true;
		varC = 100L;
		varC = 1.23f;
		varC = L"Hello CComVariant";
		varC = "Hello CComVariant";
		//....
	}

	//CComVariant与VARIANT的关联
	{
		VARIANT varA;
		VariantInit(&varA);
		varA.vt = VT_I4;
		varA.lVal = 100;
		
		CComVariant varB;

		CComVariant varC(100L);
		
		VARIANT varD;
		VariantInit(&varD);

		//Attach
		varB.Attach(&varA);		//之后无需调用VariantClear(&varA);

		//Detach
		varC.Detach(&varD);
		VariantClear(&varD);	//需要调用VariantClear(&varD);
	}

	return 0;
}