How to hide the OK button in the dialog in .Net Compact Framework application?

Question

Some dialogs like wizards should contain neither OK nor X button. How can I the OK or X button in the dialog in .Net Compact Framework application?

Answer

A. We have to import three functions from aygshell coredll DLLs:

 

class WinAPI
{
    
    [DllImport("aygshell.dll")]
    private static extern bool SHDoneButton(
        IntPtr hWnd,
        UInt32 dwState);
    [DllImport("coredll.dll")]
    public static extern UInt32 SetWindowLong(
        IntPtr hWnd,
        int nIndex,
        UInt32 dwNewLong);
    [DllImport("coredll.dll")]
    public static extern UInt32 GetWindowLong(
        IntPtr hWnd,
        int nIndex);
    
}

 

 

B. Then we write 2 functions (HideDoneButton and HideXButton) and add several constants:

 

class WinAPI
{
    
    public const UInt32 SHDB_SHOW = 0x0001;
    public const UInt32 SHDB_HIDE = 0x0002;
    public const int GWL_STYLE = -16;
    public const UInt32 WS_NONAVDONEBUTTON = 0x00010000;

    public static void HideDoneButton(IntPtr hWnd)
    {
        SHDoneButton(hWnd, SHDB_HIDE);
    }

    public static void HideXButton(IntPtr hWnd)
    {
        UInt32 dwStyle = GetWindowLong(hWnd, GWL_STYLE);

        if ((dwStyle & WS_NONAVDONEBUTTON) == 0)
            SetWindowLong(hWnd, GWL_STYLE, dwStyle | WS_NONAVDONEBUTTON);
    }
    
}

 

 

C. To hide the done (OK) button in the dialog you should add Paint event handler to the dialog and call HideDoneButton and HideXButton functions from there:

 

public class MyForm : System.Windows.Forms.Form
{
    private void MyForm_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
    {
        WinAPI.HideDoneButton();
        WinAPI.HideXButton();
    }
}

 

 

If the Paint handler is not called then you should call there functions yourself from somewhere between the dialog creation and its destruction - one of the ideas is to create a timer and to call the functions from its handler.

Done!