c# 设置自动隐藏任务栏、获取状态

from:

http://stackoverflow.com/questions/1381821/how-to-toggle-switch-windows-taskbar-from-show-to-auto-hide-and-vice-versa

[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern IntPtr FindWindow(string strClassName, string strWindowName);

[DllImport("shell32.dll")]
public static extern UInt32 SHAppBarMessage(UInt32 dwMessage, ref APPBARDATA pData);

public enum AppBarMessages
{
New =
0x00000000,
Remove =
0x00000001,
QueryPos =
0x00000002,
SetPos =
0x00000003,
GetState =
0x00000004,
GetTaskBarPos =
0x00000005,
Activate =
0x00000006,
GetAutoHideBar =
0x00000007,
SetAutoHideBar =
0x00000008,
WindowPosChanged =
0x00000009,
SetState =
0x0000000a
}

[StructLayout(LayoutKind.Sequential)]
public struct APPBARDATA
{
public UInt32 cbSize;
public IntPtr hWnd;
public UInt32 uCallbackMessage;
public UInt32 uEdge;
public Rectangle rc;
public Int32 lParam;
}

public enum AppBarStates
{
AutoHide =
0x00000001,
AlwaysOnTop =
0x00000002
}

/// <summary>
/// Set the Taskbar State option
/// </summary>
/// <param name="option">AppBarState to activate</param>
public void SetTaskbarState(AppBarStates option)
{
APPBARDATA msgData = new APPBARDATA();
msgData.cbSize = (UInt32)Marshal.SizeOf(msgData);
msgData.hWnd = FindWindow("System_TrayWnd", null);
msgData.lParam = (Int32)(option);
SHAppBarMessage((UInt32)AppBarMessages.SetState, ref msgData);
}

/// <summary>
/// Gets the current Taskbar state
/// </summary>
/// <returns>current Taskbar state</returns>
public AppBarStates GetTaskbarState()
{
APPBARDATA msgData = new APPBARDATA();
msgData.cbSize = (UInt32)Marshal.SizeOf(msgData);
msgData.hWnd = FindWindow("System_TrayWnd", null);
return (AppBarStates)SHAppBarMessage((UInt32)AppBarMessages.GetState, ref msgData);
}

When the code above is implemented just set the Taskbar to autohide by:

SetTaskbarState(AppBarStates.AutoHide);

Get the current state by:

AppBarStates currentState = GetTaskbarState();

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