在按钮上添加UAC防护罩并保留其背景图像？

在winforms应用程序中使用C＃和.Net 4.0：是否可以将UAC屏蔽添加到按钮并保留按钮背景图像？ 怎么样？

这就是我目前正在使用的，但它删除了图像……

[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！

Answer 1

正如Elmue所提到的，SystemIcons.Shield是访问UAC Shield图标的最简单方法。 这是我用来在其他图像上添加它的方法：

 public static Image AddUACShieldToImage(Image image) { var shield = SystemIcons.Shield.ToBitmap(); shield.MakeTransparent(); var g = Graphics.FromImage(image); g.CompositingMode = CompositingMode.SourceOver; g.DrawImage(shield, new Rectangle(image.Width / 2, image.Height / 2, image.Width / 2, image.Height / 2)); return image; } 

Answer 2

也许这会有所帮助： http ： //blog.csharphelper.com/2011/03/03/add-uac-shields-to-buttons-menu-items-and-picture-boxes-in-c.aspx

它采用UAC屏蔽并返回一个位图，可以放在支持位图的任何内容上。

编辑：这是一些可以工作的粗略示例代码：

 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); } } } 

这是在背景图像上绘制UAC屏蔽。 您可以调整按钮顶部的图像位置。 它看起来不像系统UAC屏蔽，但它确实在背景图像上显示UAC屏蔽图标。