Button and UAC shield

[Tiago]

Hi there,

I need to show the UAC shield in a RadButton. How can I achieve it?

We have an application which raise another process instance to a high privilege level under UAC and when the SO uses UAC (Windows Vista ou higher) I need to show the UAC shield in some buttons.

You can find the demo application here: http://support.microsoft.com/kb/981778?wa=wsignin1.0.

Please, tell me that it's doable otherwise I'll need to do the ugliest workaround of my life.

Thanks,
Tiago

[Tiago]

Hi,

One more comment... I believe just setting the FlatStyle property to System may solve my issue.

btnTelerik.FlatStyle = FlatStyle.System;

Thanks,

[Dess | Tech Support Engineer, Principal]

Hello Tiago,

Thank you for writing.

The possible solution that I can suggest is to create a bitmap from the UAC shield and assign it to the RadButton.Image property. You can find a sample implementation on the following link: http://stackoverflow.com/questions/13758458/add-a-uac-shield-to-a-button-and-retain-its-background-image

I am pasting the code snippet here as well in order the community to benefit from it:

private void Form1_Load(object sender, EventArgs e)
{
    Bitmap shield = GetUacShieldImage();
    this.radButton1.Image = shield;
    this.radButton1.Padding = new Padding(10, 0, 0, 0);
}

[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;
}

I hope this information helps. Should you have further questions, I would be glad to help.

Regards,
Dess
Telerik

 

 

[Tiago]

Hi Dess,

Thank you for your prompt support.

We need to change one line to get the code working properly:

SendMessage(btn.Handle, BCM_SETSHIELD, 0, (IntPtr)1);

Best regards,
Tiago Moura

[Dess | Tech Support Engineer, Principal]

Hello Tiago,

Thank you for writing back.

When I modify the provided code snippet from my previous post to use the code you provided

SendMessage(btn.Handle, BCM_SETSHIELD, 0, (IntPtr)1);

I am unable to build my project as the SendMessage requires integer for the last parameter:
"Error message - The best overloaded method match for 'SendMessage(System.IntPtr, uint, int, int)' has some invalid arguments".

I hope this information helps. If you have any additional questions, please let me know.

Regards,
Dess
Telerik

 

 

[Lex]

The SendMessage signature can vary, such as 

public static extern uint SendMessage(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam);​

Meanwhile, it should be noted that this call lets the shield icon shows,

SendMessage(btn.Handle, BCM_SETSHIELD, 0, (IntPtr)1);

while this call hides the shield, as explained by Microsoft at https://msdn.microsoft.com/en-us/library/aa361904.aspx 

SendMessage(btn.Handle, BCM_SETSHIELD, 0, (IntPtr)0);

[Dess | Tech Support Engineer, Principal]

Hello Lex,

Thank you for sharing this information with the community. I have also updated your Telerik points.

 

Regards,
Dess
Telerik

[Stefan]

Here is yet another way to get the UAC icon and set it to any control you may need:

System.Drawing.Icon myIcon = new System.Drawing.Icon(System.Drawing.SystemIcons.Shield, 16, 16);
radButton1.Image = myIcon.ToBitmap();

Regards,
Stefan
Telerik by Progress