82 lines
1.3 KiB
C++
82 lines
1.3 KiB
C++
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// Copyright (c) 1997-1999 Microsoft Corporation
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//
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// COM utility code
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//
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// 2-3-99 sburns
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#ifndef COMSTUFF_HPP_INCLUDED
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#define COMSTUFF_HPP_INCLUDED
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// Ensures that the type of the pointer to receive the interface pointer
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// matches the IID of the interface. If it doesn't, the static_cast will
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// cause a compiler error.
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//
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// Example:
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// IFoo* fooptr = 0;
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// HRESULT hr = punk->QueryInterface(QI_PARAMS(IFoo, &fooptr));
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//
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// From Box, D. Essential COM. pp 60-61. Addison-Wesley. ISBN 0-201-63446-5
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#define QI_PARAMS(Interface, ppvExpression) \
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IID_##Interface, reinterpret_cast<void**>(static_cast<Interface**>(ppvExpression))
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namespace Burnslib
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{
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// A BSTR wrapper that frees itself upon destruction.
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//
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// From Box, D. Essential COM. pp 80-81. Addison-Wesley. ISBN 0-201-63446-5
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class AutoBstr
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{
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public:
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explicit
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AutoBstr(const String& s)
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:
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bstr(::SysAllocString(const_cast<wchar_t*>(s.c_str())))
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{
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}
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explicit
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AutoBstr(const wchar_t* s)
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:
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bstr(::SysAllocString(s))
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{
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ASSERT(s);
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}
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~AutoBstr()
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{
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::SysFreeString(bstr);
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bstr = 0;
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}
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operator BSTR () const
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{
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return bstr;
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}
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private:
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BSTR bstr;
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};
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} // namespace Burnslib
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#endif // COMSTUFF_HPP_INCLUDED
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