Jul 022008
 

Well quite simple,  but still quite frequently asked in forums… 🙂

There are two macros that does this for us. They are as follows.

Note: You must include atlconv.h

A2W – ANSI to UNICODE
W2A – UNICODE to ANSI

Before using these two macros you have to use this macro too…

USES_CONVERSION

Here is a code snippet for you… 😉

#include <atlconv .h>
//An example for converting from ANSI to UNICODE

//use this first
USES_CONVERSION;

//An ANSI string
LPSTR lpsz_ANSI_String = "An ANSI String";

//ANSI string being converted to a UNICODE string
LPWSTR lpUnicodeStr = A2W( lpsz_ANSI_String )

//Another example for converting from UNICODE to ANSI

//Use this first
USES_CONVERSION

//A UNICODE string
LPWSTR lp_UNICODE_STR = L"A Unicode String";

//UNICODE string being converted to a ANSI string
LPSTR  lpsz_ANSI_STR = W2A( lp_UNICODE_STR );

Another option is to call WideCharToMultiByte and MultiByteToWideChar directly, it’s quite easy to use, at least easier than above macros. If you have doubts on usage of above functions then take a look at AfxW2AHelper and AfxA2WHelper functions. Since these are the functions that A2W and W2A internally calls.

Also as a homework take a look at CW2AEX and CA2WEX classes. Will be similar to above macros, looks to me like a  secure version overload.