Error C2664 'BOOL CryptBinaryToStringW(const BYTE *,DWORD,DWORD,LPWSTR,DWORD *)': cannot convert argument 4 from 'std::unique_ptr' to 'LPWSTR'

I am getting the below error when compiling the C++ project.

Error C2664 'BOOL CryptBinaryToStringW(const BYTE *,DWORD,DWORD,LPWSTR,DWORD *)': cannot convert argument 4 from 'std::unique_ptr>' to 'LPWSTR'

at the below line of code:

CryptBinaryToString(reinterpret_cast<const BYTE*>(strData.c_str()), dwSize,
        dwOptions, pwszBuffer, &dwLength);

And also I am getting the below error:

Error C2679 binary '=': no operator found which takes a right-hand operand of type 'std::unique_ptr>' (or there is no acceptable conversion)

at the below line:

sBase64 = pwszBuffer;

Below is the complete code:

bool EMRReader::EncodeBase64(DWORD dwSize, const std::string& strData, wstring& sBase64)
{
    DWORD dwOptions = CRYPT_STRING_BASE64 | CRYPT_STRING_NOCRLF;
    DWORD dwLength = 0;

    BOOL bRet = CryptBinaryToString(reinterpret_cast<const BYTE*>(strData.c_str()), dwSize,
        dwOptions, 0, &dwLength);

    if (!bRet)
        return bRet;

    std::unique_ptr<std::wstring> pwszBuffer = std::make_unique<std::wstring>(dwLength + 1);
    if (!pwszBuffer)
        return FALSE;

    SecureZeroMemory(pwszBuffer.get(), (dwLength + 1) * sizeof(wchar_t));
    CryptBinaryToString(reinterpret_cast<const BYTE*>(strData.c_str()), dwSize,
        dwOptions, pwszBuffer, &dwLength);

    sBase64 = pwszBuffer;

    return TRUE;
}

Could anyone please help me to resolve these errors?