#include <Windows.h>
#include <atlbase.h>
#include <iostream>

int main(int argc,char *argv[]) {
    USES_CONVERSION;
    LPCSTR a = "hello";
    LPCWSTR w = A2W(a);
    std::wcout << w << std::endl;
    return 0;
}

当函数退出时,将释放由A2W(ANSI到Wide)分配的任何内存.