C# Signature:

[DllImport("user32.dll", SetLastError=true)]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int x, int y, int cx, int cy, int uFlags);

VB.Net Signature:

<DllImport("user32.dll", SetLastError:=True)> _
Private Shared Function SetWindowPos(ByVal hWnd As IntPtr, _
     ByVal hWndInsertAfter As IntPtr, _
     ByVal X As Integer, _
     ByVal Y As Integer, _
     ByVal cx As Integer, _
     ByVal cy As Integer, _
     ByVal uFlags As UInteger) As Boolean
End Function

User-Defined Types:

C# Signature:

    public const int SWP_ASYNCWINDOWPOS = 0x4000;
    public const int SWP_DEFERERASE = 0x2000;
    public const int SWP_DRAWFRAME = 0x0020;
    public const int SWP_FRAMECHANGED = 0x0020;
    public const int SWP_HIDEWINDOW = 0x0080;
    public const int SWP_NOACTIVATE = 0x0010;
    public const int SWP_NOCOPYBITS = 0x0100;
    public const int SWP_NOMOVE = 0x0002;
    public const int SWP_NOOWNERZORDER = 0x0200;
    public const int SWP_NOREDRAW = 0x0008;
    public const int SWP_NOREPOSITION = 0x0200;
    public const int SWP_NOSENDCHANGING = 0x0400;
    public const int SWP_NOSIZE = 0x0001;
    public const int SWP_NOZORDER = 0x0004;
    public const int SWP_SHOWWINDOW = 0x0040;

    public const int HWND_TOP = 0;
    public const int HWND_BOTTOM = 1;
    public const int HWND_TOPMOST = -1;
    public const int HWND_NOTOPMOST = -2;

VB.Net Signature:

    Public Const SWP_NOSIZE As Integer = &H1
    Public Const SWP_NOMOVE As Integer = &H2
    Public Const SWP_NOZORDER As Integer = &H4
    Public Const SWP_NOREDRAW As Integer = &H8
    Public Const SWP_NOACTIVATE As Integer = &H10
    Public Const SWP_DRAWFRAME As Integer = &H20
    Public Const SWP_FRAMECHANGED As Integer = &H20
    Public Const SWP_SHOWWINDOW As Integer = &H40
    Public Const SWP_HIDEWINDOW As Integer = &H80
    Public Const SWP_NOCOPYBITS As Integer = &H100
    Public Const SWP_NOOWNERZORDER As Integer = &H200
    Public Const SWP_NOREPOSITION As Integer = &H200
    Public Const SWP_NOSENDCHANGING As Integer = &H400
    Public Const SWP_DEFERERASE As Integer = &H2000
    Public Const SWP_ASYNCWINDOWPOS As Integer = &H4000

Alternative Managed API:

Do you know one? Please contribute it!

Notes:

None.

Tips & Tricks:

Use this to hide the start menu and start bar.

Sample Code:

    public void HideStartBar()
    {
        IntPtr handle;

        try
        {
        // Find the handle to the Start Bar
        handle = FindWindowW("HHTaskBar", null);

        // If the handle is found then hide the start bar
        if (handle != IntPtr.Zero)
        {
            // Hide the start bar
            SetWindowPos(handle, 0, 0, 0, 0, 0, SWP_HIDEWINDOW);
        }
        }
        catch
        {
        MessageBox.Show("Could not hide Start Bar.");
        }
    }

    public void ShowStartBar()
    {
        IntPtr handle;

        try
        {
        // Find the handle to the Start Bar
        handle = FindWindowW("HHTaskBar", null);

        // If the handle is found then show the start bar
        if (handle != IntPtr.Zero)
        {
            // Show the start bar
            SetWindowPos(handle, 0, 0, 0, 240, 26, SWP_SHOWWINDOW);
        }
        }
        catch
        {
        MessageBox.Show("Could not show Start Bar.");
        }
    }

Please edit this page!

Do you have...

• helpful tips or sample code to share for using this API in managed code?
• corrections to the existing content?
• variations of the signature you want to share?
• additional languages you want to include?

Select "Edit This Page" on the right hand toolbar and edit it! Or add new pages containing supporting types needed for this API (structures, delegates, and more).