Knowledge Base

How to set the initial default size of an Active Template Library (ATL) control in Visual C++

Article ID: 176552

Article Last Modified on 12/30/2005

APPLIES TO

This article was previously published under Q176552
Note Microsoft Visual C++ .NET 2002 and Microsoft Visual C++ .NET 2003 support both the managed code model that is provided by the Microsoft .NET Framework and the unmanaged native Microsoft Windows code model. The information in this article applies only to unmanaged Visual C++ code. Microsoft Visual C++ 2005 supports both the managed code model that is provided by the Microsoft .NET Framework and the unmanaged native Microsoft Windows code model.

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 that is named m_sizeExtent. This variable is normally initialized to 5080x5080 himetric units in the constructor for CComControlBase from which CComControl is derived. You can set any default size in the constructor of your control, 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: kbhowto kbctrlcreate KB176552


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