How to use SetWindowLong in C#?

Question

I use this function:

[DllImport ( "user32.dll" )]
static extern int SetWindowLong ( IntPtr hWnd, int nIndex, uint dwNewLong );

and pass values from these:

http://pinvoke.net/default.aspx/Constants/Window%20styles.html

enum WindowLongFlags : int
{
    GWL_EXSTYLE = -20,
    GWLP_HINSTANCE = -6,
    GWLP_HWNDPARENT = -8,
    GWL_ID = -12,
    GWL_STYLE = -16,
    GWL_USERDATA = -21,
    GWL_WNDPROC = -4,
    DWLP_USER = 0x8,
    DWLP_MSGRESULT = 0x0,
    DWLP_DLGPROC = 0x4
}

So when I call it as:

SetWindowLong ( c, WindowLongFlags.GWL_STYLE, WindowStyles.WS_OVERLAPPED );

I get these errors:

Argument 2: cannot convert from 'timoti.WindowLongFlags' to 'int'

Argument 3: cannot convert from 'timoti.WindowStyles' to 'uint'

Is the pinvoke signature wrong as I have seen different ones online or am I missing something else?

Answer 1

this should fix it

SetWindowLong ( c, (int)WindowLongFlags.GWL_STYLE,
    (uint) WindowStyles.WS_OVERLAPPED);