更改后的InitInstance 写一遍

当然，下面是根据您的要求修改后的InitInstance函数代码：

BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
    hInst = hInstance; // 将实例句柄存储在全局变量中

    HWND hWnd = CreateWindowW(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, nullptr, nullptr, hInstance, nullptr);

    if (!hWnd)
    {
        return FALSE;
    }

    vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New();
    renderWindow->SetWindowId(reinterpret_cast<void*>(hWnd));
    renderWindow->SetSize(600, 600);

    vtkSmartPointer<vtkRenderer> ren1 = vtkSmartPointer<vtkRenderer>::New();
    ren1->SetBackground(0.1, 0.2, 0.4);

    vtkSmartPointer<vtkConeSource> cone = vtkSmartPointer<vtkConeSource>::New();
    cone->SetHeight(3.0);
    cone->SetRadius(1.0);
    cone->SetResolution(10);

    vtkSmartPointer<vtkPolyDataMapper> coneMapper = vtkSmartPointer<vtkPolyDataMapper>::New();
    coneMapper->SetInputConnection(cone->GetOutputPort());

    vtkSmartPointer<vtkActor> coneActor = vtkSmartPointer<vtkActor>::New();
    coneActor->SetMapper(coneMapper);

    ren1->AddActor(coneActor);
    ren1->SetActiveCamera(ren1->GetActiveCamera());
    ren1->ResetCamera();

    renderWindow->AddRenderer(ren1);

    vtkSmartPointer<vtkRenderWindowInteractor> iren = vtkSmartPointer<vtkRenderWindowInteractor>::New();
    iren->SetRenderWindow(renderWindow);

    vtkSmartPointer<vtkInteractorStyleTrackballCamera> style = vtkSmartPointer<vtkInteractorStyleTrackballCamera>::New();
    iren->SetInteractorStyle(style);

    vtkSmartPointer<vtkBoxWidget> boxWidget = vtkSmartPointer<vtkBoxWidget>::New();
    boxWidget->SetInteractor(iren);
    boxWidget->SetPlaceFactor(1.25);
    boxWidget->SetProp3D(coneActor);
    boxWidget->PlaceWidget();

    vtkSmartPointer<vtkMyCallback> callback = vtkSmartPointer<vtkMyCallback>::New();
    boxWidget->AddObserver(vtkCommand::InteractionEvent, callback);

    boxWidget->On();

    iren->Initialize();
    iren->Start();

    ShowWindow(hWnd, nCmdShow);
    UpdateWindow(hWnd);

    renderWindow->Render();

    return TRUE;
}

请注意，在最后调用了`renderWindow->Render()`方法来触发VTK的渲染过程，并在Win32窗口中显示VTK渲染结果。

希望这次的修改能够解决问题。如果问题仍然存在，请提供更多关于您的代码和环境的信息，以便我能够更具体地帮助您。