How to find out DC's dimensions?

Question

Let\'s say I have a handle to device context (naturally, in Windows environment):

HDC hdc;

How can I get the width and height of it?

Answer 1

but if get Calculator' window_dc dimension, it will failed at “GetCurrentObject” or "GetObject", i think maybe the window attribute include "ws_ex_noredirectionbitmap", how to get dismension in this case?

HDC win_dc = ::GetWindowDC(hwnd);
BITMAP bm = { 0 };
HGDIOBJ hBitmap = GetCurrentObject(win_dc, OBJ_BITMAP);
if (hBitmap)
{
    if (GetObject(hBitmap, sizeof(BITMAP), &bm))
    {
        windc_dimension.cx = bm.bmWidth;
        windc_dimension.cy = bm.bmHeight;
    }
}