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CW2WEX Class

This class is used by the string conversion macros CW2TEX and CT2WEX, and the typedef CW2W.

Important note Important

This class and its members cannot be used in applications that execute in the Windows Runtime.

template< 
int t_nBufferLength= 128 
> 
class CW2WEX

t_nBufferLength

The size of the buffer used in the translation process. The default length is 128 bytes.

Name

Description

CW2WEX::CW2WEX

The constructor.

CW2WEX::~CW2WEX

The destructor.

Name

Description

CW2WEX::operator LPWSTR

Conversion operator.

Name

Description

CW2WEX::m_psz

The data member that stores the source string.

CW2WEX::m_szBuffer

The static buffer, used to store the converted string.

Unless extra functionality is required, use CW2TEX, CT2WEX, or CW2W in your code.

This class contains a fixed-size static buffer which is used to store the result of the conversion. If the result is too large to fit into the static buffer, the class allocates memory using malloc, freeing the memory when the object goes out of scope. This ensures that, unlike text conversion macros available in previous versions of ATL, this class is safe to use in loops and that it won't overflow the stack.

If the class tries to allocate memory on the heap and fails, it will call AtlThrow with an argument of E_OUTOFMEMORY.

By default, the ATL conversion classes and macros use the current thread's ANSI code page for the conversion.

The following macros are based on this class:

  • CW2TEX

  • CT2WEX

The following typedef is based on this class:

  • CW2W

For a discussion of these text conversion macros, see ATL and MFC String Conversion Macros.

See ATL and MFC String Conversion Macros for an example of using these string conversion macros.

Header: atlconv.h

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