CODEWITHSUNDEEP
c#refreshc#-2.0windows-ce
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Reputation: 2437

Refresh Windows CE - Taskbar

Is there any possibility to refresh the Taskbar in Windows-CE by C#?

In my software I kill some processes by OpenNETCF.ToolHelp.ProcessEntry.Kill(). This works fine, the Icon is removed from the taskbar, but the space for the icon is still left. After some tests I killed about 20 processes, and now it pushed out the start-button from the taskbar.

The empty space is removed by clicking on it.

How can I refresh the taskbar from my C#-program?

EDIT: I'm currently working on Windows-CE 4.2.

Upvotes: 1

Views: 580

Answers (2)

AlainD
AlainD

Reputation: 6587

Based on the suggestion by Damon8or, here is sample code that does what you need:

[DllImport("coredll.dll")]
public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

[DllImport("coredll.dll")]
public static extern IntPtr SendMessage(IntPtr hWnd, int nMsg, IntPtr wParam, IntPtr lParam);

private const int WM_MOUSEMOVE = 0x0200;

public static void RefreshTrayArea()
{
    // The client rectangle can be determined using "GetClientRect" (from coredll.dll) but
    // does require the taskbar to be visible. The values used in the loop below were
    // determined empirically.
    IntPtr hTrayWnd = FindWindow("HHTaskBar", null);
    if (hTrayWnd != IntPtr.Zero)
    {
        int nStartX = (Screen.PrimaryScreen.Bounds.Width / 2);
        int nStopX = Screen.PrimaryScreen.Bounds.Width;
        int nStartY = 0;
        int nStopY = 26;    // From experimentation...
        for (int nX = nStartX; nX < nStopX; nX += 10)
            for (int nY = nStartY; nY < nStopY; nY += 5)
                SendMessage(hTrayWnd,
                    WM_MOUSEMOVE, IntPtr.Zero, (IntPtr)((nY << 16) + nX));
    }
}

Hope that helps.

Upvotes: 1

Damon8or
Damon8or

Reputation: 527

Try to get the handle to the taskbar window P/Invoking FindWindow, look for "HHTaskBar" as class name. Then invalidate the window.

Upvotes: 1

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