These classes provide support for strings and text string conversions.
- CA2AEX This class is used by the string conversion macros CA2TEX and CT2AEX, and the typedef CA2A. 
- CA2CAEX This class is used by string conversion macros CA2CTEX and CT2CAEX, and the typedef CA2CA. 
- CA2WEX This class is used by the string conversion macros CA2TEX, CA2CTEX, CT2WEX, and CT2CWEX, and the typedef CA2W. 
- CW2AEX This class is used by the string conversion macros CT2AEX, CW2TEX, CW2CTEX, and CT2CAEX, and the typedef CW2A. 
- CW2CWEX This class is used by the string conversion macros CW2CTEX and CT2CWEX, and the typedef CW2CW. 
- CW2WEX This class is used by the string conversion macros CW2TEX and CT2WEX, and the typedef CW2W. 
- CComBSTR This class is a wrapper for BSTRs. 
- _U_STRINGorID This argument adapter class allows either resource names (LPCTSTRs) or resource IDs (UINTs) to be passed to a function without requiring the caller to convert the ID to a string using the MAKEINTRESOURCE macro.