Is it the correct way of converting char* to LPWSTR ?
void convertcharpointerToLPWSTR(char *a) { int nSize = MultiByteToWideChar(CP_ACP, 0, a, -1, NULL, 0); LPWSTR a_LPWSTR = new WCHAR[nSize]; MultiByteToWideChar(CP_ACP, 0, a, -1, a_LPWSTR, nSize); } Your implementation would either cause a memory leak or making the caller responsive for freeing the memory which was allocated by your function, which is always a really faulty and bad pattern. You should better return an object caring for its own memory as std::wstring does:
inline std::wstring a2w(LPCSTR psz, UINT codepage) { if (!psz || *psz == 0) return std::wstring(); int nLen = int(strlen(psz)); int resultChars = ::MultiByteToWideChar(codepage, 0, psz, nLen, nullptr, 0); std::wstring result(resultChars, (wchar_t)0); ::MultiByteToWideChar(codepage, 0, psz, nLen, &result[0], resultChars); return result; } 
CStringW(a).GetString(). Using this safely requires understanding of object life times.