Width of window border

Trying to get the width of a window border to accurately make a window's client area centered on the screen. Stumbled upon SystemParametersInfo + SPI_GETNONCLIENTMETRICS / SPI_GETBORDER. In both cases, it returns to me that the border is only one pixel. Which I have a hard time believing. I use this code:

Code:

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int CenterWindow(HWND hwnd, int width, int height)
{
    NONCLIENTMETRICS ncm;
   
    rect scrrect;
    int ret = 0;
   
    ncm.cbSize = sizeof(NONCLIENTMETRICS);
    ret = ::SystemParametersInfo(SPI_GETWORKAREA, 0, &scrrect,
                                SPIF_UPDATEINIFILE);
   
    if(!ret)
        return 0;
   
    point center(scrrect.bx() / 2, scrrect.by() / 2);         
    point tl(center.x() - width / 2, center.y() - height / 2);
   
    ::SystemParametersInfo(SPI_GETNONCLIENTMETRICS,
                          sizeof(NONCLIENTMETRICS), &ncm, 0);

   
    ret = ::MoveWindow(hwnd, tl.x() - ncm.iBorderWidth, tl.y() -
                      ncm.iCaptionHeight, width + ncm.iBorderWidth,
                      height + ncm.iBorderWidth, TRUE);

    return ret;
}

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I call it with the width and height being the dimensions of the client area that I want. When the function is done, I call GetClientRect, and the bottom and right members of the RECT structure end up being 493 and 567. Is there another way I should be retrieving this sort of info? Is the computer LYING?

Why not use the WS_CENTER style?

Or use the difference between GetWindowRect() and GetClientRect() to find the non client area?

ScreenToClient() may also help.

I am not sure about what you are asking but
GetSystemMetrics(SM_CXBORDER);
GetSystemMetrics(SM_CXEDGE);
GetSystemMetrics(SM_CXFIZEDFRAME);
Might help ???

Also, have a look at the AdjustWindowRect function.