TCHAR

TCHAR is a data type that is a character string on either a Unicode or an ANSI or DBCS platform. For Unicode platforms, this string is defined as having the WCHAR type. For ANSI and DBCS platforms, the string is defined as having the char type.

typedef char          TCHAR; 

typedef WCHAR  TCHAR;

Remarks

The client application can use TCHAR to represent a string of either the WCHAR or char type. Be sure to define the symbolic constant UNICODE and limit the platform where necessary. MAPI will interpret the platform information and internally translate TCHAR to the appropriate string.