Win32::API : Creating a LPCWSTR type input parameter from a string

ajose has asked for the wisdom of the Perl Monks concerning the following question:

I am just beginner in using the Perl module Win32::API. I could successfully invoke the Win32 API's and parse the return values using this module. But now I am stuck at a point where I have to invoke the API with a parameter of data type LPCWSTR as an input parameter. I tried following method to achieve the same.

    $profileName = encode("UTF-16LE", $profileName);
    $profileName = pack ('p', $profileName);
    $API{ api}->Call($handle, $interface, $profileName, 0, $profileXml
+, 0, 0));
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API declaration:

DWORD WINAPI WlanGetProfile(
  __in         HANDLE hClientHandle,
  __in         const GUID *pInterfaceGuid,
  __in         LPCWSTR strProfileName,
  __reserved   PVOID pReserved,
  __out        LPWSTR *pstrProfileXml,
  __inout_opt  DWORD *pdwFlags,
  __out_opt    PDWORD pdwGrantedAccess
);
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Output is:

Argument "t\0e\0s\0t\0\0\0\0\0\0\0\0\0\0\0\0\0..." isn't numeric in su
+broutine entry at ...
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Please help me by suggesting any work around to convert the string to LPCWSTR format before invoking the API. Also output of this API call is also a pointer type(LPWSTR). Hence please help me here also.

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