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

Andrey Lebedev (andrey.lebedev@softspb.com), November 06, 2003.

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!

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