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这是一个奇怪的问题。我有兴趣在计算机上构建一个导航应用程序。我想在用户完成某事时给他们“物理提示”。例如，单击文件夹时白色光环会扩大。这可以用 C# 来完成吗？一位用户建议我将其扩展为更详细的内容以更具体。我想使用 Kinect 让用户在操作系统中导航。但是，我希望他们能够使用双手，所以我不想只是将手连接到鼠标指针上。我想给用户一些关于他们与操作系统交互的视觉反馈。我很难想到最好的方法来做到这一点。所以我想在操作系统上创建视觉效果，而不是在任何特定的窗口中，比如游戏窗口。

我看到的大多数图形教程要么涉及构建窗口并为该窗口渲染管道；或使用 WPF 和 Silverlight 图形和动画。我需要更多的灵活性，因为这将适用于操作系统而不是特定应用程序。我无法确定从哪里开始，以及是否可以使用 .NET 或 Mono Framework。

我最好只使用 C++ 来实现这个目标。如果这个问题过于开放，请告诉我。我试图找到如何开始做这样的事情。谢谢！

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1 回答 1

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.NET WinForms，就像 C++ WinForms 使用 GDI+，.NET 只是更加抽象。您仍然可以通过 p/invoke 访问本机代码，并且能够覆盖抽象 BCL 中的受保护成员，这意味着您仍然具有相当程度的控制权。因此，除非您谈论的是特定的图形库，否则我认为 .NET WinForms 不会比 C++ 小。在这种情况下。

关于你的任务，我会研究分层窗口。抱歉，我手头没有任何全面的参考资料，因为我在学习时努力寻找它们，但这是我聚集在一起的一门课程，可以帮助您开始在分层窗口上绘图。而不是从派生的主要形式Form派生自SingleLayeredForm：

public class SingleLayeredForm : Form
{
    public new event PaintEventHandler Paint;

    public SingleLayeredForm()
    {
        this.SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
        this.FormBorderStyle = FormBorderStyle.FixedSingle;
        this.StartPosition = FormStartPosition.Manual;
    }

    protected override CreateParams CreateParams
    {
        get
        {
            if (DesignMode) return base.CreateParams;
            CreateParams createParams = base.CreateParams;
            createParams.ExStyle = createParams.ExStyle | 0x80000;
            return createParams;
        }
    }

    public void SetBitmap(Bitmap bitmap)
    {
        if (!IsHandleCreated || DesignMode) return;
        IntPtr oldBits = IntPtr.Zero;
        IntPtr screenDC = WinAPI.GetDC(IntPtr.Zero);
        IntPtr hBitmap = IntPtr.Zero;
        IntPtr memDC = WinAPI.CreateCompatibleDC(screenDC);
        try
        {
            Point topLocation = new Point(this.Left, this.Top);
            Size bitmapSize = new Size(bitmap.Width, bitmap.Height);
            WinAPI.BLENDFUNCTION blendFunc = new WinAPI.BLENDFUNCTION();
            Point sourceLocation = Point.Empty;
            hBitmap = bitmap.GetHbitmap(Color.FromArgb(0));
            oldBits = WinAPI.SelectObject(memDC, hBitmap);

            blendFunc.BlendOp = WinAPI.AC_SRC_OVER;
            blendFunc.SourceConstantAlpha = 255;
            blendFunc.AlphaFormat = WinAPI.AC_SRC_ALPHA;
            blendFunc.BlendFlags = 0;

            WinAPI.UpdateLayeredWindow(Handle, screenDC, ref topLocation, ref bitmapSize, memDC, ref sourceLocation, 0, ref blendFunc, WinAPI.ULW_ALPHA);
        }
        finally
        {
            if (hBitmap != IntPtr.Zero)
            {
                WinAPI.SelectObject(memDC, oldBits);
                WinAPI.DeleteObject(hBitmap);
            }
            WinAPI.ReleaseDC(IntPtr.Zero, screenDC);
            WinAPI.DeleteDC(memDC);
        }
    }

    public new void Invalidate()
    {
        using (Bitmap bitmap = new Bitmap(this.ClientSize.Width, this.ClientSize.Height))
        {
            using (Graphics graphics = Graphics.FromImage(bitmap))
            {

                graphics.SmoothingMode = SmoothingMode.HighSpeed;
                graphics.CompositingMode = CompositingMode.SourceCopy;

                if (this.Paint != null)
                    this.Paint(this, new PaintEventArgs(graphics, Rectangle.Empty));
            }
            SetBitmap(bitmap);
        }
    }
}

public sealed class WinAPI
{
    [DllImport("user32.dll")]
    public static extern bool HideCaret(IntPtr hWnd);

    [DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true, CallingConvention = CallingConvention.Winapi)]
    public static extern short GetKeyState(int keyCode);

    [DllImport("user32.dll")]
    public static extern bool RegisterHotKey(IntPtr hWnd, int id, uint fsModifiers, uint vk);

    [DllImport("user32.dll")]
    public static extern bool UnregisterHotKey(IntPtr hWnd, int id);

    [DllImport("gdi32.dll", SetLastError = true)]
    public static extern IntPtr CreateCompatibleDC(IntPtr hdc);

    [DllImport("user32.dll")]
    public static extern IntPtr GetDC(IntPtr hWnd);

    [DllImport("gdi32.dll", ExactSpelling = true, PreserveSig = true, SetLastError = true)]
    public static extern IntPtr SelectObject(IntPtr hdc, IntPtr hgdiobj);

    [DllImport("user32.dll")]
    public static extern bool ReleaseDC(IntPtr hWnd, IntPtr hDC);

    [DllImport("gdi32.dll")]
    public static extern bool DeleteDC(IntPtr hdc);

    [DllImport("gdi32.dll")]
    public static extern bool DeleteObject(IntPtr hObject);

    [DllImport("user32.dll", ExactSpelling = true, SetLastError = true)]
    public static extern bool UpdateLayeredWindow(IntPtr hwnd, IntPtr hdcDst, ref Point pptDst, ref Size psize, IntPtr hdcSrc, ref Point pptSrc, uint crKey, [In] ref BLENDFUNCTION pblend, uint dwFlags);

    [DllImport("user32.dll")]
    public static extern IntPtr GetDesktopWindow();

    [DllImport("user32.dll")]
    public static extern IntPtr GetWindowDC(IntPtr ptr);

    [DllImport("gdi32.dll")]
    public static extern IntPtr CreateCompatibleBitmap(IntPtr hdc, int nWidth, int nHeight);

    [DllImport("gdi32.dll")]
    public static extern bool BitBlt(IntPtr hdcDest, int xDest, int yDest, int wDest, int hDest, IntPtr hdcSource, int xSrc, int ySrc, CopyPixelOperation rop);

    [DllImport("user32.dll")]
    public static extern IntPtr GetForegroundWindow();

    [DllImport("user32.dll")]
    public static extern bool GetWindowRect(IntPtr hWnd, out RECT rect);

    public const byte AC_SRC_OVER = 0;
    public const byte AC_SRC_ALPHA = 1;
    public const byte ULW_ALPHA = 2;

    [StructLayout(LayoutKind.Sequential, Pack = 1)]
    public struct BLENDFUNCTION
    {
        public byte BlendOp;
        public byte BlendFlags;
        public byte SourceConstantAlpha;
        public byte AlphaFormat;
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct RECT
    {
        public int Left;
        public int Top;
        public int Right;
        public int Bottom;
    }
}
于 2012-12-23T15:21:39.720 回答