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How to move dialog window by dragging at any point?

Here we need a handle for WM_NCHITTEST message. Every time you drag mouse over the window the system post this message to find out where the cursor is. We simply cheat the system and make thinking it is over the caption of the window (even if there is no any) and in mainWndProc return HTCAPTION.

LRESULT CALLBACK mainDlgProc(HWND hWnd,UINT uMessage,WPARAM wParam,LPARAM lParam)
{
  switch(uMessage) {
    case WM_DESTROY:
      PostQuitMessage(0);
      break;

    case WM_NCHITTEST:
      return HTCAPTION;

    case WM_CLOSE:
      PostMessage(hWnd, WM_COMMAND, IDCANCEL,0);
      break;

    case WM_DESTROY:
      PostQuitMessage(0);
      break;

   /* Some more */

    default:
      return DefWindowProc(hWnd, uMessage, wParam, lParam);
  }
  return 0;
}

Sample Win32 project for MSVC and executable are available.

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