CW2AEX Class

This class is used by the string conversion macros CT2AEX, CW2TEX, CW2CTEX, and CT2CAEX, and the typedef CW2A.

   int t_nBufferLength = 128
class CW2AEX


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


Unless extra functionality is required, use CT2AEX, CW2TEX, CW2CTEX, CT2CAEX, or CW2A 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. If you want to override that behavior for a specific conversion, specify the code page as the second parameter to the constructor for the class.

The following macros are based on this class:

  • CT2AEX

  • CW2TEX



The following typedef is based on this class:

  • CW2A

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

See Also


CA2AEX Class


CA2WEX Class


CW2WEX Class

Other Resources

CW2AEX Members

ATL Class Overview