C++ 中TCHAR字符串数组转化为Char类型数组

#include <stdio.h>
#include <tchar.h>

char* UnicodeToAnsi( const wchar_t* szStr )
{
int nLen = WideCharToMultiByte( CP_ACP, 0, szStr, -1, NULL, 0, NULL, NULL );
if (nLen == 0)
{
return NULL;
}
char* pResult = new char[nLen];
WideCharToMultiByte( CP_ACP, 0, szStr, -1, pResult, nLen, NULL, NULL );
return pResult;
}

void  main(){

TCHAR msg[100];
swprintf_s(msg, L"sjlkjdkld");
char *str=UnicodeToAnsi(msg);

}