I am trying to get the font of controls in other applications.

When I try WM_GETFONT, it returns 0. This my code:

[DllImport("User32.DLL")] public static extern IntPtr SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam); 

IntPtr fx = SendMessage(button1.Handle, 0x31, 0, 0); 

When I use GetTextFace with a button, it always returns "system". This is my code:

StringBuilder Buff = new StringBuilder(256);

IntPtr dc = GetDCEx(button1.Handle, IntPtr.Zero, DeviceContextValues.Window 
|DeviceContextValues.Cache | DeviceContextValues.ClipSiblings | DeviceContextValues.IntersectRgn);

IntPtr hfont = GetTextFace(dc, 256, Buff);

Of course I'm sure I changed the font type.

How can I solve this problem?

I am using C# under Windows 7.