HOWTO: Set Initial Default Size of ActiveX (ATL) Control

• The Microsoft Active Template Library (ATL), versions 2.0, 2.1, 3.0, used with:
  • Microsoft Visual C++, 32-bit Editions, versions 5.0, 6.0

SUMMARY

This article shows how to set the default size of an Active Template Library (ATL) control when it is first inserted into a container. The default width and height of an ATL control is stored in a variable called m_sizeExtent, which is normally initialized to 5080x5080 himetric units in the constructor for CComControlBase from which CComControl is derived. You can set your own preferred default size in your control's constructor, as follows:

   CTestControl()
   {
      // width = 100 pixels, height = 25 pixels
      SIZE sz = { 100, 25 };
      // convert pixels to himetric
      AtlPixelToHiMetric (&sz, &m_sizeExtent);
      // store natural extent
      m_sizeNatural = m_sizeExtent;
   } 

Additional query words: kbVC500 kbVC600 kbATL200 kbATL210 kbATL300 kbctrl

Keywords : kbnokeyword kbActiveX kbATL200 kbATL210 kbCOMt kbCtrlCreate kbATL300 kbGrpMFCATL
Version : WINDOWS:2.0,2.1,3.0
Platform : WINDOWS
Issue type : kbhowto