Cstring to char type conversion --- "=": cannot be converted from "wchar_t *" to "char *

This article has been copied from the Internet and the source of the original article has been lost. Sorry.
In VC 2005, this simple problem is a little more complicated.
In the project, an essential step is to convert the cstring to the shar * string. Through Google, I found that the following methods can be used:
Use the getbuffer method of cstring
Cstring S ("Hello, world ");
Char * c = S. getbuffer (0 );
However, I compiled the following information in VC ++ 2005:
Error c2440: "initialization": cannot be converted from "wchar_t *" to "char *"
The difference between wchar_t and char is not very clear. In msdn, we checked that wchar_t is a wide character type, which is equivalent to unsigned short (16bit ). The Char we usually use is 8bit. Continue to search for conversion from wchar_t * To char *. The previous article on msdn is convert between various string types, which describes various strings char *, wchar_t *, _ bstr_t in VC ++ 2005, ccombstr, cstring, basic_string, and system. string Conversion. The code for converting wchar_t * To char * is as follows: (To maintain Article consistency, the variable name is modified)
# Include <stdlib. h>
# Include <iostream>
Using namespace STD;
Int main ()
{
Wchar_t * s = l "Hello, world ";
Wcout <S <Endl;

// Convert to a char *
Size_t S0 = wcslen (s) + 1;
Const size_t newsize = 100;
Size_t convertedchars = 0;
Char C [newsize];
Wcstombs_s (& convertedchars, C, S0, S, _ truncate );
Cout <C <Endl;
}
The output is correct. All are Hello, world!

As for why the original code can be used by others, I cannot directly use it under VC ++ 2005, but what should I do through conversion? We can see that chapter 2 of programming windows talks about Unicode and asks related questions in the msdn forum to get the answer.
Previously, before VC ++ 2005, Unicode support was disabled for applications by default. In vc2005, support for Unicode was enabled by default. The string corresponding to cstring should be tchar, tchar is defined as follows,
# Ifdef _ Unicode
Typedef wchar_t tchar;
# Else
Typedef char tchar;
# Endif
I think this is the reason why I cannot directly convert in VC ++ 2005. In the project, you should be able to disable Unicode support for direct conversion. In this case, right-click the project name-> property-> character set in general and select not set. In this way, the code at the beginning can be correctly executed. This saves a lot of trouble.

Cstring to char type conversion --- "=": cannot be converted from "wchar_t *" to "char *