在桌面如何显示这样的效果？

Question

如图：
想知道的是：
1.那个框式怎么打印出来的，貌似半透明。
2.文字阴影如何实现？思路OR代码，最好代码，因为我已经实现了桌面漂浮文字，半透明框，但效果不够好。

Answer 1

没有平台的支持做这些是很费力的，这也是为什么MS要整个WPF

Answer 2

我手头上有一套做这样效果的类代码，是之前突然兴起想用C#做桌面工具时候找回来的……贴出来或许能够帮到你……using System;
using System.Runtime.InteropServices;
using System.ComponentModel;
using System.Text;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.Windows.Forms;
using System.Collections;/// <summary>
/// Wind32API声明
/// </summary>
internal class Win32
{
    [StructLayout(LayoutKind.Sequential)]
    public struct Size
    {
        public Int32 cx;
        public Int32 cy;        public Size(Int32 x, Int32 y)
        {
            cx = x;
            cy = y;
        }
    }    [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 Point
    {
        public Int32 x;
        public Int32 y;        public Point(Int32 x, Int32 y)
        {
            this.x = x;
            this.y = y;
        }
    }    public const byte AC_SRC_OVER = 0;
    public const Int32 ULW_ALPHA = 2;
    public const byte AC_SRC_ALPHA = 1;    [DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]
    public static extern IntPtr CreateCompatibleDC(IntPtr hDC);    [DllImport("user32.dll", ExactSpelling = true, SetLastError = true)]
    public static extern IntPtr GetDC(IntPtr hWnd);    [DllImport("gdi32.dll", ExactSpelling = true)]
    public static extern IntPtr SelectObject(IntPtr hDC, IntPtr hObj);    [DllImport("user32.dll", ExactSpelling = true)]
    public static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);    [DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]
    public static extern int DeleteDC(IntPtr hDC);    [DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]
    public static extern int DeleteObject(IntPtr hObj);    [DllImport("user32.dll", ExactSpelling = true, SetLastError = true)]
    public static extern int UpdateLayeredWindow(IntPtr hwnd, IntPtr hdcDst, ref Point pptDst, ref Size psize, IntPtr hdcSrc, ref Point pptSrc, Int32 crKey, ref BLENDFUNCTION pblend, Int32 dwFlags);    [DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]
    public static extern IntPtr ExtCreateRegion(IntPtr lpXform, uint nCount, IntPtr rgnData);

Answer 3

 public partial class Form2 : Form
    {
        Point oldPoint = new Point(0, 0);
        bool mouseDown = false;
                protected override void OnClosing(CancelEventArgs e)
        {
            e.Cancel = true;
            base.OnClosing(e);        }
                protected override void OnHandleCreated(EventArgs e)
        {
           
            base.OnHandleCreated(e);        }
                protected override CreateParams CreateParams
        {
            get
            {
                CreateParams cParms = base.CreateParams;
                cParms.ExStyle |= 0x00080000; // WS_EX_LAYERED
                return cParms;
            }
        }
                public Form2()
        {
            InitializeComponent();
                         this.MouseDown += new MouseEventHandler(Form2_MouseDown);
            this.MouseUp += new MouseEventHandler(Form2_MouseUp);
            this.MouseMove += new MouseEventHandler(Form2_MouseMove);
        }        void Form2_MouseMove(object sender, MouseEventArgs e)
        {
            if (mouseDown)
            {
                this.Left += (e.X - oldPoint.X);
                this.Top += (e.Y - oldPoint.Y);
            }
        }        void Form2_MouseUp(object sender, MouseEventArgs e)
        {
            mouseDown = false;
        }        void Form2_MouseDown(object sender, MouseEventArgs e)
        {
            oldPoint = e.Location;
            mouseDown = true;
        }        public void SetBits(Bitmap bitmap)
        {
                        if (!Bitmap.IsCanonicalPixelFormat(bitmap.PixelFormat) || !Bitmap.IsAlphaPixelFormat(bitmap.PixelFormat))
                throw new ApplicationException("图片必须是32位带Alhpa通道的图片。");            IntPtr oldBits = IntPtr.Zero;
            IntPtr screenDC = Win32.GetDC(IntPtr.Zero);
            IntPtr hBitmap = IntPtr.Zero;
            IntPtr memDc = Win32.CreateCompatibleDC(screenDC);            try
            {
                Win32.Point topLoc = new Win32.Point(Left, Top);
                Win32.Size bitMapSize = new Win32.Size(bitmap.Width, bitmap.Height);
                Win32.BLENDFUNCTION blendFunc = new Win32.BLENDFUNCTION();
                Win32.Point srcLoc = new Win32.Point(0, 0);                hBitmap = bitmap.GetHbitmap(Color.FromArgb(0));
                oldBits = Win32.SelectObject(memDc, hBitmap);                blendFunc.BlendOp = Win32.AC_SRC_OVER;
                blendFunc.SourceConstantAlpha = 255;
                blendFunc.AlphaFormat = Win32.AC_SRC_ALPHA;
                blendFunc.BlendFlags = 0;                Win32.UpdateLayeredWindow(Handle, screenDC, ref topLoc, ref bitMapSize, memDc, ref srcLoc, 0, ref blendFunc, Win32.ULW_ALPHA);
            }
            finally
            {
                if (hBitmap != IntPtr.Zero)
                {
                    Win32.SelectObject(memDc, oldBits);
                    Win32.DeleteObject(hBitmap);
                }
                Win32.ReleaseDC(IntPtr.Zero, screenDC);
                Win32.DeleteDC(memDc);
            }
        }
这是窗体的代码，使用SetBits过程就可以实现你要的窗体效果的了……

Answer 4

在哪里调用SetBits呢？怎么我没有效果。

Answer 5

顶mywatermelon，的确可以显示边框，但文字阴影如何实现呢？