c++ - window border width and height in Win32 - how do I get it?

Question

      ::GetSystemMetrics (SM_CYBORDER)

...comes back with 1 and I know the title bar is taller than ONE pixel :/

I also tried:

     RECT r;
      r.left = r.top = 0;   r.right = r.bottom = 400;
      ::AdjustWindowRect (& r, WS_OVERLAPPED, FALSE);
      _bdW = (uword)(r.right - r.left - 400);
      _bdH = (uword)(r.bottom - r.top - 400);

But border w,h came back as 0.

In my WM_SIZE handler, I need to make sure the window's height changes in "steps" so, for example a whole new line of text could fit in the window with no "junky partial line space" at the bottom.

But ::MoveWindow needs the dimensions WITH the border space added in.

SOMEbody must have done this before... Thanks for any help :)

Answer 1

The GetWindowRect and GetClientRect functions can be used calculate the size of all the window borders.

Suite101 has a article on resizing a window and the keeping client area at a know size.

Here is their sample code:

void ClientResize(HWND hWnd, int nWidth, int nHeight)
{
  RECT rcClient, rcWind;
  POINT ptDiff;
  GetClientRect(hWnd, &rcClient);
  GetWindowRect(hWnd, &rcWind);
  ptDiff.x = (rcWind.right - rcWind.left) - rcClient.right;
  ptDiff.y = (rcWind.bottom - rcWind.top) - rcClient.bottom;
  MoveWindow(hWnd,rcWind.left, rcWind.top, nWidth + ptDiff.x, nHeight + ptDiff.y, TRUE);
}