一个UAC盾牌添加到一个按钮并保留其背景图片？ [英] Add a UAC shield to a button and retain its background image?

问题描述

在一个WinForms应用程序中使用C＃和.NET 4.0：是否有可能在UAC盾牌添加到一个按钮并保留按钮背景图片？怎么样？

Using C# and .Net 4.0 in a winforms application: Is it possible to add the UAC shield to a button and retain the buttons background image? How?

这是我目前使用的是什么，但它消除了图像...

This is what I'm using at the moment, but it removes the image...

[DllImport("user32.dll")]
public static extern int SendMessage(IntPtr hWnd, uint Msg, int wParam, int lParam);

public static void UACToButton(Button button, bool add)
{
    const Int32 BCM_SETSHIELD = 0x160C;
    if (add)
        {
        // The button must have the flat style
        button.FlatStyle = FlatStyle.System;
        if (button.Text == "")
        // and it must have text to display the shield
            button.Text = " ";
            SendMessage(button.Handle, BCM_SETSHIELD, 0, 1);        
        }
        else
            SendMessage(button.Handle, BCM_SETSHIELD, 0, 0);    
}

谢谢！

Thanks!

推荐答案

也许这将帮助：的 http://blog.csharphelper.com/2011/03/03/add-uac-shields-to-buttons-menu-items-and - 图片箱式-c.aspx

它采用的UAC盾牌，并返回一个可以放置在任何一个支持位图的位图。

It takes the UAC shield and returns a bitmap that can be placed on anything that supports bitmaps.

编辑：
下面是一些粗糙的示例代码，可以工作：

Here's some rough sample code that could work:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace UAC_Test
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        [DllImport("user32.dll")]
        public static extern int SendMessage(IntPtr hWnd, uint Msg, int wParam, int lParam);

        // Make the button display the UAC shield.
        public static void AddShieldToButton(Button btn)
        {
            const Int32 BCM_SETSHIELD = 0x160C;

            // Give the button the flat style and make it display the UAC shield.
            btn.FlatStyle = System.Windows.Forms.FlatStyle.System;
            SendMessage(btn.Handle, BCM_SETSHIELD, 0, 1);
        }

        // Return a bitmap containing the UAC shield.
        private static Bitmap shield_bm = null;
        public static Bitmap GetUacShieldImage()
        {
            if (shield_bm != null) return shield_bm;

            const int WID = 50;
            const int HGT = 50;
            const int MARGIN = 4;

            // Make the button. For some reason, it must
            // have text or the UAC shield won't appear.
            Button btn = new Button();
            btn.Text = " ";
            btn.Size = new Size(WID, HGT);
            AddShieldToButton(btn);

            // Draw the button onto a bitmap.
            Bitmap bm = new Bitmap(WID, HGT);
            btn.Refresh();
            btn.DrawToBitmap(bm, new Rectangle(0, 0, WID, HGT));

            // Find the part containing the shield.
            int min_x = WID, max_x = 0, min_y = HGT, max_y = 0;

            // Fill on the left.
            for (int y = MARGIN; y < HGT - MARGIN; y++)
            {
                // Get the leftmost pixel's color.
                Color target_color = bm.GetPixel(MARGIN, y);

                // Fill in with this color as long as we see the target.
                for (int x = MARGIN; x < WID - MARGIN; x++)
                {
                    // See if this pixel is part of the shield.
                    if (bm.GetPixel(x, y).Equals(target_color))
                    {
                        // It's not part of the shield.
                        // Clear the pixel.
                        bm.SetPixel(x, y, Color.Transparent);
                    }
                    else
                    {
                        // It's part of the shield.
                        if (min_y > y) min_y = y;
                        if (min_x > x) min_x = x;
                        if (max_y < y) max_y = y;
                        if (max_x < x) max_x = x;
                    }
                }
            }

            // Clip out the shield part.
            int shield_wid = max_x - min_x + 1;
            int shield_hgt = max_y - min_y + 1;
            shield_bm = new Bitmap(shield_wid, shield_hgt);
            Graphics shield_gr = Graphics.FromImage(shield_bm);
            shield_gr.DrawImage(bm, 0, 0,
                new Rectangle(min_x, min_y, shield_wid, shield_hgt),
                GraphicsUnit.Pixel);

            // Return the shield.
            return shield_bm;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            Graphics gfx = Graphics.FromImage(button1.BackgroundImage);
            Bitmap shield = GetUacShieldImage();
            gfx.DrawImage(shield, button1.Width / 2, button1.Height / 2);
        }
    }
}

这是借鉴了UAC盾牌在背景图像。您可以在按钮的顶部调整图像位置。它看起来并不作为系统UAC盾牌漂亮，但它确实表明你的背景图像的顶部UAC的盾牌图标。

This is drawing the UAC shield over the background image. You can adjust the image location on top of the button. It doesn't look as pretty as the System UAC shield, but it does show the UAC shield icon on top of your background image.

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